Mercurial > sdl-ios-xcode

annotate src/audio/SDL_audiocvt.c @ 2657:29306e52dab8 gsoc2008_audio_resampling

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Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
author Aaron Wishnick <schnarf@gmail.com>
date Wed, 18 Jun 2008 22:42:27 +0000
parents dd74182b3c3c
children de29a03cb108
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23 #include <math.h>
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24
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25 /* Functions for audio drivers to perform runtime conversion of audio format */
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26
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27 #include "SDL_audio.h"
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28 #include "SDL_audio_c.h"
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29
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dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
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30 #define DEBUG_CONVERT
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31
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32 /* Perform fractional multiplication of two 32-bit integers to produce a 32-bit result. Assumes sizeof(long) = 4 */
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33 /*#define SDL_FixMpy32(v1, v2, dest) { \
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34 long a, b, c, d; \
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35 long x, y; \
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36 a = (v1 >> 16) & 0xffff; \
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37 b = v1 & 0xffff; \
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38 c = (v2 >> 16); \
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39 d = v2 & 0xffff; \
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40 x = a * d + c * b; \
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41 y = (((b*d) >> 16) & 0xffff) + x; \
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42 dest = ((y >> 16) & 0xffff) + (a * c); \
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43 }*/
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44 /* TODO: Check if 64-bit type exists. If not, see http://www.8052.com/mul16.phtml or http://www.cs.uaf.edu/~cs301/notes/Chapter5/node5.html */
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45
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
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46 #define SDL_FixMpy32(a, b) ((((long long)a * (long long)b) >> 32) & 0xffffffff)
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47 #ifdef DEBUG_CONVERT
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48 #define SDL_FixMpy16(a, b) ((((long)a * (long)b) >> 16) & 0xffff); printf("%f * %f = %f\n", (float)a / 16384.0f, (float)b / 16384.0f, (float)((((long)a * (long)b) >> 16) & 0xffff) / 16384.0f);
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49 #else
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50 #define SDL_FixMpy16(a, b) ((((long)a * (long)b) >> 16) & 0xffff)
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51 #endif
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52 #define SDL_FixMpy8(a, b) ((((short)a * (short)b) >> 8) & 0xff)
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53
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54 #define SDL_Make_1_7(a) (Uint8)(a * 128.0f)
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55 #define SDL_Make_1_15(a) (Uint16)(a * 32768.0f)
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56 #define SDL_Make_1_31(a) (Uint32)(a * 2147483648.0f)
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57 #define SDL_Make_2_6(a) (Uint8)(a * 64.0f)
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58 #define SDL_Make_2_14(a) (Uint16)(a * 16384.0f)
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59 #define SDL_Make_2_30(a) (Uint32)(a * 1073741824.0f)
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60
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61 /* Effectively mix right and left channels into a single channel */
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62 static void SDLCALL
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63 SDL_ConvertMono(SDL_AudioCVT * cvt, SDL_AudioFormat format)
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64 {
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65 int i;
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66 Sint32 sample;
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67
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68 #ifdef DEBUG_CONVERT
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69 fprintf(stderr, "Converting to mono\n");
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70 #endif
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71 switch (format & (SDL_AUDIO_MASK_SIGNED | SDL_AUDIO_MASK_BITSIZE)) {
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72 case AUDIO_U8:
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73 {
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74 Uint8 *src, *dst;
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75
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76 src = cvt->buf;
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77 dst = cvt->buf;
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78 for (i = cvt->len_cvt / 2; i; --i) {
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79 sample = src[0] + src[1];
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80 *dst = (Uint8) (sample / 2);
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81 src += 2;
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82 dst += 1;
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83 }
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84 }
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85 break;
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86
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87 case AUDIO_S8:
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88 {
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89 Sint8 *src, *dst;
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90
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91 src = (Sint8 *) cvt->buf;
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92 dst = (Sint8 *) cvt->buf;
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93 for (i = cvt->len_cvt / 2; i; --i) {
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94 sample = src[0] + src[1];
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95 *dst = (Sint8) (sample / 2);
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96 src += 2;
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97 dst += 1;
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98 }
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99 }
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100 break;
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101
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102 case AUDIO_U16:
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103 {
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104 Uint8 *src, *dst;
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105
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106 src = cvt->buf;
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107 dst = cvt->buf;
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108 if (SDL_AUDIO_ISBIGENDIAN(format)) {
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109 for (i = cvt->len_cvt / 4; i; --i) {
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110 sample = (Uint16) ((src[0] << 8) | src[1]) +
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111 (Uint16) ((src[2] << 8) | src[3]);
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112 sample /= 2;
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113 dst[1] = (sample & 0xFF);
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114 sample >>= 8;
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115 dst[0] = (sample & 0xFF);
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116 src += 4;
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117 dst += 2;
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118 }
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diff changeset
119 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
120 for (i = cvt->len_cvt / 4; i; --i) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
121 sample = (Uint16) ((src[1] << 8) | src[0]) +
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
122 (Uint16) ((src[3] << 8) | src[2]);
2042
3908e1f808e1 Fixed bug #292
Sam Lantinga <slouken@libsdl.org>
parents: 2014
diff changeset
123 sample /= 2;
3908e1f808e1 Fixed bug #292
Sam Lantinga <slouken@libsdl.org>
parents: 2014
diff changeset
124 dst[0] = (sample & 0xFF);
3908e1f808e1 Fixed bug #292
Sam Lantinga <slouken@libsdl.org>
parents: 2014
diff changeset
125 sample >>= 8;
3908e1f808e1 Fixed bug #292
Sam Lantinga <slouken@libsdl.org>
parents: 2014
diff changeset
126 dst[1] = (sample & 0xFF);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
127 src += 4;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
128 dst += 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
129 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
130 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
131 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
132 break;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
133
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
134 case AUDIO_S16:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
135 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
136 Uint8 *src, *dst;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
137
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
138 src = cvt->buf;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
139 dst = cvt->buf;
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
140 if (SDL_AUDIO_ISBIGENDIAN(format)) {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
141 for (i = cvt->len_cvt / 4; i; --i) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
142 sample = (Sint16) ((src[0] << 8) | src[1]) +
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
143 (Sint16) ((src[2] << 8) | src[3]);
2042
3908e1f808e1 Fixed bug #292
Sam Lantinga <slouken@libsdl.org>
parents: 2014
diff changeset
144 sample /= 2;
3908e1f808e1 Fixed bug #292
Sam Lantinga <slouken@libsdl.org>
parents: 2014
diff changeset
145 dst[1] = (sample & 0xFF);
3908e1f808e1 Fixed bug #292
Sam Lantinga <slouken@libsdl.org>
parents: 2014
diff changeset
146 sample >>= 8;
3908e1f808e1 Fixed bug #292
Sam Lantinga <slouken@libsdl.org>
parents: 2014
diff changeset
147 dst[0] = (sample & 0xFF);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
148 src += 4;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
149 dst += 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
150 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
151 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
152 for (i = cvt->len_cvt / 4; i; --i) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
153 sample = (Sint16) ((src[1] << 8) | src[0]) +
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
154 (Sint16) ((src[3] << 8) | src[2]);
2042
3908e1f808e1 Fixed bug #292
Sam Lantinga <slouken@libsdl.org>
parents: 2014
diff changeset
155 sample /= 2;
3908e1f808e1 Fixed bug #292
Sam Lantinga <slouken@libsdl.org>
parents: 2014
diff changeset
156 dst[0] = (sample & 0xFF);
3908e1f808e1 Fixed bug #292
Sam Lantinga <slouken@libsdl.org>
parents: 2014
diff changeset
157 sample >>= 8;
3908e1f808e1 Fixed bug #292
Sam Lantinga <slouken@libsdl.org>
parents: 2014
diff changeset
158 dst[1] = (sample & 0xFF);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
159 src += 4;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
160 dst += 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
161 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
162 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
163 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
164 break;
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
165
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
166 case AUDIO_S32:
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
167 {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
168 const Uint32 *src = (const Uint32 *) cvt->buf;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
169 Uint32 *dst = (Uint32 *) cvt->buf;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
170 if (SDL_AUDIO_ISBIGENDIAN(format)) {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
171 for (i = cvt->len_cvt / 8; i; --i, src += 2) {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
172 const Sint64 added =
1985
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
173 (((Sint64) (Sint32) SDL_SwapBE32(src[0])) +
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
174 ((Sint64) (Sint32) SDL_SwapBE32(src[1])));
2078
f932ac47a331 Apparently it's possible that MSVC will want to call a built-in function to
Ryan C. Gordon <icculus@icculus.org>
parents: 2049
diff changeset
175 *(dst++) = SDL_SwapBE32((Uint32) ((Sint32) (added / 2)));
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
176 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
177 } else {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
178 for (i = cvt->len_cvt / 8; i; --i, src += 2) {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
179 const Sint64 added =
1985
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
180 (((Sint64) (Sint32) SDL_SwapLE32(src[0])) +
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
181 ((Sint64) (Sint32) SDL_SwapLE32(src[1])));
2078
f932ac47a331 Apparently it's possible that MSVC will want to call a built-in function to
Ryan C. Gordon <icculus@icculus.org>
parents: 2049
diff changeset
182 *(dst++) = SDL_SwapLE32((Uint32) ((Sint32) (added / 2)));
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
183 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
184 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
185 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
186 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
187
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
188 case AUDIO_F32:
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
189 {
2014
7abe37467fa5 Replaced unions with calls to SDL_SwapFloat...
Ryan C. Gordon <icculus@icculus.org>
parents: 1985
diff changeset
190 const float *src = (const float *) cvt->buf;
7abe37467fa5 Replaced unions with calls to SDL_SwapFloat...
Ryan C. Gordon <icculus@icculus.org>
parents: 1985
diff changeset
191 float *dst = (float *) cvt->buf;
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
192 if (SDL_AUDIO_ISBIGENDIAN(format)) {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
193 for (i = cvt->len_cvt / 8; i; --i, src += 2) {
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2042
diff changeset
194 const float src1 = SDL_SwapFloatBE(src[0]);
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2042
diff changeset
195 const float src2 = SDL_SwapFloatBE(src[1]);
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
196 const double added = ((double) src1) + ((double) src2);
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2042
diff changeset
197 const float halved = (float) (added * 0.5);
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2042
diff changeset
198 *(dst++) = SDL_SwapFloatBE(halved);
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
199 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
200 } else {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
201 for (i = cvt->len_cvt / 8; i; --i, src += 2) {
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2042
diff changeset
202 const float src1 = SDL_SwapFloatLE(src[0]);
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2042
diff changeset
203 const float src2 = SDL_SwapFloatLE(src[1]);
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
204 const double added = ((double) src1) + ((double) src2);
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2042
diff changeset
205 const float halved = (float) (added * 0.5);
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2042
diff changeset
206 *(dst++) = SDL_SwapFloatLE(halved);
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
207 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
208 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
209 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
210 break;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
211 }
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
212
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
213 cvt->len_cvt /= 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
214 if (cvt->filters[++cvt->filter_index]) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
215 cvt->filters[cvt->filter_index] (cvt, format);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
216 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
217 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
218
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
219
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
220 /* Discard top 4 channels */
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
221 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
222 SDL_ConvertStrip(SDL_AudioCVT * cvt, SDL_AudioFormat format)
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
223 {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
224 int i;
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
225
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
226 #ifdef DEBUG_CONVERT
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
227 fprintf(stderr, "Converting down from 6 channels to stereo\n");
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
228 #endif
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
229
1985
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
230 #define strip_chans_6_to_2(type) \
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
231 { \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
232 const type *src = (const type *) cvt->buf; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
233 type *dst = (type *) cvt->buf; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
234 for (i = cvt->len_cvt / (sizeof (type) * 6); i; --i) { \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
235 dst[0] = src[0]; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
236 dst[1] = src[1]; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
237 src += 6; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
238 dst += 2; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
239 } \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
240 }
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
241
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
242 /* this function only cares about typesize, and data as a block of bits. */
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
243 switch (SDL_AUDIO_BITSIZE(format)) {
1985
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
244 case 8:
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
245 strip_chans_6_to_2(Uint8);
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
246 break;
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
247 case 16:
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
248 strip_chans_6_to_2(Uint16);
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
249 break;
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
250 case 32:
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
251 strip_chans_6_to_2(Uint32);
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
252 break;
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
253 }
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
254
1985
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
255 #undef strip_chans_6_to_2
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
256
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
257 cvt->len_cvt /= 3;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
258 if (cvt->filters[++cvt->filter_index]) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
259 cvt->filters[cvt->filter_index] (cvt, format);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
260 }
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
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parents: 769
diff changeset
261 }
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
262
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
263
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
264 /* Discard top 2 channels of 6 */
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
265 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
266 SDL_ConvertStrip_2(SDL_AudioCVT * cvt, SDL_AudioFormat format)
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
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parents: 769
diff changeset
267 {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
268 int i;
942
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parents: 769
diff changeset
269
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
270 #ifdef DEBUG_CONVERT
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1769
diff changeset
271 fprintf(stderr, "Converting 6 down to quad\n");
942
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parents: 769
diff changeset
272 #endif
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
273
1985
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
274 #define strip_chans_6_to_4(type) \
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
275 { \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
276 const type *src = (const type *) cvt->buf; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
277 type *dst = (type *) cvt->buf; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
278 for (i = cvt->len_cvt / (sizeof (type) * 6); i; --i) { \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
279 dst[0] = src[0]; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
280 dst[1] = src[1]; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
281 dst[2] = src[2]; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
282 dst[3] = src[3]; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
283 src += 6; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
284 dst += 4; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
285 } \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
286 }
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
287
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
288 /* this function only cares about typesize, and data as a block of bits. */
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
289 switch (SDL_AUDIO_BITSIZE(format)) {
1985
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
290 case 8:
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
291 strip_chans_6_to_4(Uint8);
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
292 break;
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
293 case 16:
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
294 strip_chans_6_to_4(Uint16);
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
295 break;
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
296 case 32:
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
297 strip_chans_6_to_4(Uint32);
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
298 break;
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
299 }
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
300
1985
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
301 #undef strip_chans_6_to_4
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
302
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
303 cvt->len_cvt /= 6;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
304 cvt->len_cvt *= 4;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
305 if (cvt->filters[++cvt->filter_index]) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
306 cvt->filters[cvt->filter_index] (cvt, format);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
307 }
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
308 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
309
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
310 /* Duplicate a mono channel to both stereo channels */
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
311 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
312 SDL_ConvertStereo(SDL_AudioCVT * cvt, SDL_AudioFormat format)
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
313 {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1769
diff changeset
314 int i;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
315
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
316 #ifdef DEBUG_CONVERT
1895
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parents: 1769
diff changeset
317 fprintf(stderr, "Converting to stereo\n");
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
318 #endif
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
319
1985
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
320 #define dup_chans_1_to_2(type) \
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
321 { \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
322 const type *src = (const type *) (cvt->buf + cvt->len_cvt); \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
323 type *dst = (type *) (cvt->buf + cvt->len_cvt * 2); \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
324 for (i = cvt->len_cvt / 2; i; --i, --src) { \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
325 const type val = *src; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
326 dst -= 2; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
327 dst[0] = dst[1] = val; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
328 } \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
329 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
330
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
331 /* this function only cares about typesize, and data as a block of bits. */
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
332 switch (SDL_AUDIO_BITSIZE(format)) {
1985
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
333 case 8:
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
334 dup_chans_1_to_2(Uint8);
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
335 break;
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
336 case 16:
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
337 dup_chans_1_to_2(Uint16);
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
338 break;
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
339 case 32:
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
340 dup_chans_1_to_2(Uint32);
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
341 break;
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
342 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
343
1985
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
344 #undef dup_chans_1_to_2
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
345
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
346 cvt->len_cvt *= 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
347 if (cvt->filters[++cvt->filter_index]) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
348 cvt->filters[cvt->filter_index] (cvt, format);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
349 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
350 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
351
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
352
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
353 /* Duplicate a stereo channel to a pseudo-5.1 stream */
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
354 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
355 SDL_ConvertSurround(SDL_AudioCVT * cvt, SDL_AudioFormat format)
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
356 {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
357 int i;
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
358
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
359 #ifdef DEBUG_CONVERT
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
360 fprintf(stderr, "Converting stereo to surround\n");
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
361 #endif
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
362
1985
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
363 switch (format & (SDL_AUDIO_MASK_SIGNED | SDL_AUDIO_MASK_BITSIZE)) {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
364 case AUDIO_U8:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
365 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
366 Uint8 *src, *dst, lf, rf, ce;
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
367
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
368 src = (Uint8 *) (cvt->buf + cvt->len_cvt);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
369 dst = (Uint8 *) (cvt->buf + cvt->len_cvt * 3);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
370 for (i = cvt->len_cvt; i; --i) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
371 dst -= 6;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
372 src -= 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
373 lf = src[0];
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
374 rf = src[1];
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
375 ce = (lf / 2) + (rf / 2);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
376 dst[0] = lf;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
377 dst[1] = rf;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
378 dst[2] = lf - ce;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
379 dst[3] = rf - ce;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
380 dst[4] = ce;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
381 dst[5] = ce;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
382 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
383 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
384 break;
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
385
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
386 case AUDIO_S8:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
387 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
388 Sint8 *src, *dst, lf, rf, ce;
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
389
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
390 src = (Sint8 *) cvt->buf + cvt->len_cvt;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
391 dst = (Sint8 *) cvt->buf + cvt->len_cvt * 3;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
392 for (i = cvt->len_cvt; i; --i) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
393 dst -= 6;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
394 src -= 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
395 lf = src[0];
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
396 rf = src[1];
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
397 ce = (lf / 2) + (rf / 2);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
398 dst[0] = lf;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
399 dst[1] = rf;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
400 dst[2] = lf - ce;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
401 dst[3] = rf - ce;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
402 dst[4] = ce;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
403 dst[5] = ce;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
404 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
405 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
406 break;
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
407
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
408 case AUDIO_U16:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
409 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
410 Uint8 *src, *dst;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
411 Uint16 lf, rf, ce, lr, rr;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
412
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
413 src = cvt->buf + cvt->len_cvt;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
414 dst = cvt->buf + cvt->len_cvt * 3;
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
415
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
416 if (SDL_AUDIO_ISBIGENDIAN(format)) {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
417 for (i = cvt->len_cvt / 4; i; --i) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
418 dst -= 12;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
419 src -= 4;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
420 lf = (Uint16) ((src[0] << 8) | src[1]);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
421 rf = (Uint16) ((src[2] << 8) | src[3]);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
422 ce = (lf / 2) + (rf / 2);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
423 rr = lf - ce;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
424 lr = rf - ce;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
425 dst[1] = (lf & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
426 dst[0] = ((lf >> 8) & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
427 dst[3] = (rf & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
428 dst[2] = ((rf >> 8) & 0xFF);
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
429
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
430 dst[1 + 4] = (lr & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
431 dst[0 + 4] = ((lr >> 8) & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
432 dst[3 + 4] = (rr & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
433 dst[2 + 4] = ((rr >> 8) & 0xFF);
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
434
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
435 dst[1 + 8] = (ce & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
436 dst[0 + 8] = ((ce >> 8) & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
437 dst[3 + 8] = (ce & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
438 dst[2 + 8] = ((ce >> 8) & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
439 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
440 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
441 for (i = cvt->len_cvt / 4; i; --i) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
442 dst -= 12;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
443 src -= 4;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
444 lf = (Uint16) ((src[1] << 8) | src[0]);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
445 rf = (Uint16) ((src[3] << 8) | src[2]);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
446 ce = (lf / 2) + (rf / 2);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
447 rr = lf - ce;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
448 lr = rf - ce;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
449 dst[0] = (lf & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
450 dst[1] = ((lf >> 8) & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
451 dst[2] = (rf & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
452 dst[3] = ((rf >> 8) & 0xFF);
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
453
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
454 dst[0 + 4] = (lr & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
455 dst[1 + 4] = ((lr >> 8) & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
456 dst[2 + 4] = (rr & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
457 dst[3 + 4] = ((rr >> 8) & 0xFF);
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
458
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
459 dst[0 + 8] = (ce & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
460 dst[1 + 8] = ((ce >> 8) & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
461 dst[2 + 8] = (ce & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
462 dst[3 + 8] = ((ce >> 8) & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
463 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
464 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
465 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
466 break;
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
467
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
468 case AUDIO_S16:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
469 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
470 Uint8 *src, *dst;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
471 Sint16 lf, rf, ce, lr, rr;
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
472
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
473 src = cvt->buf + cvt->len_cvt;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
474 dst = cvt->buf + cvt->len_cvt * 3;
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
475
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
476 if (SDL_AUDIO_ISBIGENDIAN(format)) {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
477 for (i = cvt->len_cvt / 4; i; --i) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
478 dst -= 12;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
479 src -= 4;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
480 lf = (Sint16) ((src[0] << 8) | src[1]);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
481 rf = (Sint16) ((src[2] << 8) | src[3]);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
482 ce = (lf / 2) + (rf / 2);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
483 rr = lf - ce;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
484 lr = rf - ce;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
485 dst[1] = (lf & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
486 dst[0] = ((lf >> 8) & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
487 dst[3] = (rf & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
488 dst[2] = ((rf >> 8) & 0xFF);
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
489
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
490 dst[1 + 4] = (lr & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
491 dst[0 + 4] = ((lr >> 8) & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
492 dst[3 + 4] = (rr & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
493 dst[2 + 4] = ((rr >> 8) & 0xFF);
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
494
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
495 dst[1 + 8] = (ce & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
496 dst[0 + 8] = ((ce >> 8) & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
497 dst[3 + 8] = (ce & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
498 dst[2 + 8] = ((ce >> 8) & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
499 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
500 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
501 for (i = cvt->len_cvt / 4; i; --i) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
502 dst -= 12;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
503 src -= 4;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
504 lf = (Sint16) ((src[1] << 8) | src[0]);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
505 rf = (Sint16) ((src[3] << 8) | src[2]);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
506 ce = (lf / 2) + (rf / 2);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
507 rr = lf - ce;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
508 lr = rf - ce;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
509 dst[0] = (lf & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
510 dst[1] = ((lf >> 8) & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
511 dst[2] = (rf & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
512 dst[3] = ((rf >> 8) & 0xFF);
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
513
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
514 dst[0 + 4] = (lr & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
515 dst[1 + 4] = ((lr >> 8) & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
516 dst[2 + 4] = (rr & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
517 dst[3 + 4] = ((rr >> 8) & 0xFF);
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
518
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
519 dst[0 + 8] = (ce & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
520 dst[1 + 8] = ((ce >> 8) & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
521 dst[2 + 8] = (ce & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
522 dst[3 + 8] = ((ce >> 8) & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
523 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
524 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
525 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
526 break;
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
527
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
528 case AUDIO_S32:
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
529 {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
530 Sint32 lf, rf, ce;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
531 const Uint32 *src = (const Uint32 *) cvt->buf + cvt->len_cvt;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
532 Uint32 *dst = (Uint32 *) cvt->buf + cvt->len_cvt * 3;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
533
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
534 if (SDL_AUDIO_ISBIGENDIAN(format)) {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
535 for (i = cvt->len_cvt / 8; i; --i) {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
536 dst -= 6;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
537 src -= 2;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
538 lf = (Sint32) SDL_SwapBE32(src[0]);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
539 rf = (Sint32) SDL_SwapBE32(src[1]);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
540 ce = (lf / 2) + (rf / 2);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
541 dst[0] = SDL_SwapBE32((Uint32) lf);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
542 dst[1] = SDL_SwapBE32((Uint32) rf);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
543 dst[2] = SDL_SwapBE32((Uint32) (lf - ce));
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
544 dst[3] = SDL_SwapBE32((Uint32) (rf - ce));
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
545 dst[4] = SDL_SwapBE32((Uint32) ce);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
546 dst[5] = SDL_SwapBE32((Uint32) ce);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
547 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
548 } else {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
549 for (i = cvt->len_cvt / 8; i; --i) {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
550 dst -= 6;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
551 src -= 2;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
552 lf = (Sint32) SDL_SwapLE32(src[0]);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
553 rf = (Sint32) SDL_SwapLE32(src[1]);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
554 ce = (lf / 2) + (rf / 2);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
555 dst[0] = src[0];
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
556 dst[1] = src[1];
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
557 dst[2] = SDL_SwapLE32((Uint32) (lf - ce));
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
558 dst[3] = SDL_SwapLE32((Uint32) (rf - ce));
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
559 dst[4] = SDL_SwapLE32((Uint32) ce);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
560 dst[5] = SDL_SwapLE32((Uint32) ce);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
561 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
562 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
563 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
564 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
565
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
566 case AUDIO_F32:
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
567 {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
568 float lf, rf, ce;
2014
7abe37467fa5 Replaced unions with calls to SDL_SwapFloat...
Ryan C. Gordon <icculus@icculus.org>
parents: 1985
diff changeset
569 const float *src = (const float *) cvt->buf + cvt->len_cvt;
7abe37467fa5 Replaced unions with calls to SDL_SwapFloat...
Ryan C. Gordon <icculus@icculus.org>
parents: 1985
diff changeset
570 float *dst = (float *) cvt->buf + cvt->len_cvt * 3;
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
571
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
572 if (SDL_AUDIO_ISBIGENDIAN(format)) {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
573 for (i = cvt->len_cvt / 8; i; --i) {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
574 dst -= 6;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
575 src -= 2;
2014
7abe37467fa5 Replaced unions with calls to SDL_SwapFloat...
Ryan C. Gordon <icculus@icculus.org>
parents: 1985
diff changeset
576 lf = SDL_SwapFloatBE(src[0]);
7abe37467fa5 Replaced unions with calls to SDL_SwapFloat...
Ryan C. Gordon <icculus@icculus.org>
parents: 1985
diff changeset
577 rf = SDL_SwapFloatBE(src[1]);
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
578 ce = (lf * 0.5f) + (rf * 0.5f);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
579 dst[0] = src[0];
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
580 dst[1] = src[1];
2014
7abe37467fa5 Replaced unions with calls to SDL_SwapFloat...
Ryan C. Gordon <icculus@icculus.org>
parents: 1985
diff changeset
581 dst[2] = SDL_SwapFloatBE(lf - ce);
7abe37467fa5 Replaced unions with calls to SDL_SwapFloat...
Ryan C. Gordon <icculus@icculus.org>
parents: 1985
diff changeset
582 dst[3] = SDL_SwapFloatBE(rf - ce);
7abe37467fa5 Replaced unions with calls to SDL_SwapFloat...
Ryan C. Gordon <icculus@icculus.org>
parents: 1985
diff changeset
583 dst[4] = dst[5] = SDL_SwapFloatBE(ce);
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
584 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
585 } else {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
586 for (i = cvt->len_cvt / 8; i; --i) {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
587 dst -= 6;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
588 src -= 2;
2014
7abe37467fa5 Replaced unions with calls to SDL_SwapFloat...
Ryan C. Gordon <icculus@icculus.org>
parents: 1985
diff changeset
589 lf = SDL_SwapFloatLE(src[0]);
7abe37467fa5 Replaced unions with calls to SDL_SwapFloat...
Ryan C. Gordon <icculus@icculus.org>
parents: 1985
diff changeset
590 rf = SDL_SwapFloatLE(src[1]);
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
591 ce = (lf * 0.5f) + (rf * 0.5f);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
592 dst[0] = src[0];
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
593 dst[1] = src[1];
2014
7abe37467fa5 Replaced unions with calls to SDL_SwapFloat...
Ryan C. Gordon <icculus@icculus.org>
parents: 1985
diff changeset
594 dst[2] = SDL_SwapFloatLE(lf - ce);
7abe37467fa5 Replaced unions with calls to SDL_SwapFloat...
Ryan C. Gordon <icculus@icculus.org>
parents: 1985
diff changeset
595 dst[3] = SDL_SwapFloatLE(rf - ce);
7abe37467fa5 Replaced unions with calls to SDL_SwapFloat...
Ryan C. Gordon <icculus@icculus.org>
parents: 1985
diff changeset
596 dst[4] = dst[5] = SDL_SwapFloatLE(ce);
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
597 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
598 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
599 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
600 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
601
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
602 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
603 cvt->len_cvt *= 3;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
604 if (cvt->filters[++cvt->filter_index]) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
605 cvt->filters[cvt->filter_index] (cvt, format);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
606 }
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
607 }
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
608
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
609
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
610 /* Duplicate a stereo channel to a pseudo-4.0 stream */
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
611 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
612 SDL_ConvertSurround_4(SDL_AudioCVT * cvt, SDL_AudioFormat format)
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
613 {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
614 int i;
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
615
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
616 #ifdef DEBUG_CONVERT
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
617 fprintf(stderr, "Converting stereo to quad\n");
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
618 #endif
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
619
1985
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
620 switch (format & (SDL_AUDIO_MASK_SIGNED | SDL_AUDIO_MASK_BITSIZE)) {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
621 case AUDIO_U8:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
622 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
623 Uint8 *src, *dst, lf, rf, ce;
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
624
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
625 src = (Uint8 *) (cvt->buf + cvt->len_cvt);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
626 dst = (Uint8 *) (cvt->buf + cvt->len_cvt * 2);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
627 for (i = cvt->len_cvt; i; --i) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
628 dst -= 4;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
629 src -= 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
630 lf = src[0];
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
631 rf = src[1];
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
632 ce = (lf / 2) + (rf / 2);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
633 dst[0] = lf;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
634 dst[1] = rf;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
635 dst[2] = lf - ce;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
636 dst[3] = rf - ce;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
637 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
638 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
639 break;
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
640
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
641 case AUDIO_S8:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
642 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
643 Sint8 *src, *dst, lf, rf, ce;
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
644
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
645 src = (Sint8 *) cvt->buf + cvt->len_cvt;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
646 dst = (Sint8 *) cvt->buf + cvt->len_cvt * 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
647 for (i = cvt->len_cvt; i; --i) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
648 dst -= 4;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
649 src -= 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
650 lf = src[0];
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
651 rf = src[1];
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
652 ce = (lf / 2) + (rf / 2);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
653 dst[0] = lf;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
654 dst[1] = rf;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
655 dst[2] = lf - ce;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
656 dst[3] = rf - ce;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
657 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
658 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
659 break;
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
660
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
661 case AUDIO_U16:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
662 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
663 Uint8 *src, *dst;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
664 Uint16 lf, rf, ce, lr, rr;
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
665
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
666 src = cvt->buf + cvt->len_cvt;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
667 dst = cvt->buf + cvt->len_cvt * 2;
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
668
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
669 if (SDL_AUDIO_ISBIGENDIAN(format)) {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
670 for (i = cvt->len_cvt / 4; i; --i) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
671 dst -= 8;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
672 src -= 4;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
673 lf = (Uint16) ((src[0] << 8) | src[1]);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
674 rf = (Uint16) ((src[2] << 8) | src[3]);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
675 ce = (lf / 2) + (rf / 2);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
676 rr = lf - ce;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
677 lr = rf - ce;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
678 dst[1] = (lf & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
679 dst[0] = ((lf >> 8) & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
680 dst[3] = (rf & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
681 dst[2] = ((rf >> 8) & 0xFF);
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
682
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
683 dst[1 + 4] = (lr & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
684 dst[0 + 4] = ((lr >> 8) & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
685 dst[3 + 4] = (rr & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
686 dst[2 + 4] = ((rr >> 8) & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
687 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
688 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
689 for (i = cvt->len_cvt / 4; i; --i) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
690 dst -= 8;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
691 src -= 4;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
692 lf = (Uint16) ((src[1] << 8) | src[0]);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
693 rf = (Uint16) ((src[3] << 8) | src[2]);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
694 ce = (lf / 2) + (rf / 2);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
695 rr = lf - ce;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
696 lr = rf - ce;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
697 dst[0] = (lf & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
698 dst[1] = ((lf >> 8) & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
699 dst[2] = (rf & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
700 dst[3] = ((rf >> 8) & 0xFF);
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
701
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
702 dst[0 + 4] = (lr & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
703 dst[1 + 4] = ((lr >> 8) & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
704 dst[2 + 4] = (rr & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
705 dst[3 + 4] = ((rr >> 8) & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
706 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
707 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
708 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
709 break;
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
710
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
711 case AUDIO_S16:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
712 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
713 Uint8 *src, *dst;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
714 Sint16 lf, rf, ce, lr, rr;
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
715
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
716 src = cvt->buf + cvt->len_cvt;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
717 dst = cvt->buf + cvt->len_cvt * 2;
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
718
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
719 if (SDL_AUDIO_ISBIGENDIAN(format)) {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
720 for (i = cvt->len_cvt / 4; i; --i) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
721 dst -= 8;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
722 src -= 4;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
723 lf = (Sint16) ((src[0] << 8) | src[1]);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
724 rf = (Sint16) ((src[2] << 8) | src[3]);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
725 ce = (lf / 2) + (rf / 2);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
726 rr = lf - ce;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
727 lr = rf - ce;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
728 dst[1] = (lf & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
729 dst[0] = ((lf >> 8) & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
730 dst[3] = (rf & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
731 dst[2] = ((rf >> 8) & 0xFF);
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
732
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
733 dst[1 + 4] = (lr & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
734 dst[0 + 4] = ((lr >> 8) & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
735 dst[3 + 4] = (rr & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
736 dst[2 + 4] = ((rr >> 8) & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
737 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
738 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
739 for (i = cvt->len_cvt / 4; i; --i) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
740 dst -= 8;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
741 src -= 4;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
742 lf = (Sint16) ((src[1] << 8) | src[0]);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
743 rf = (Sint16) ((src[3] << 8) | src[2]);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
744 ce = (lf / 2) + (rf / 2);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
745 rr = lf - ce;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
746 lr = rf - ce;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
747 dst[0] = (lf & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
748 dst[1] = ((lf >> 8) & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
749 dst[2] = (rf & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
750 dst[3] = ((rf >> 8) & 0xFF);
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
751
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
752 dst[0 + 4] = (lr & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
753 dst[1 + 4] = ((lr >> 8) & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
754 dst[2 + 4] = (rr & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
755 dst[3 + 4] = ((rr >> 8) & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
756 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
757 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
758 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
759 break;
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
760
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
761 case AUDIO_S32:
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
762 {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
763 const Uint32 *src = (const Uint32 *) (cvt->buf + cvt->len_cvt);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
764 Uint32 *dst = (Uint32 *) (cvt->buf + cvt->len_cvt * 2);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
765 Sint32 lf, rf, ce;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
766
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
767 if (SDL_AUDIO_ISBIGENDIAN(format)) {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
768 for (i = cvt->len_cvt / 8; i; --i) {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
769 dst -= 4;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
770 src -= 2;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
771 lf = (Sint32) SDL_SwapBE32(src[0]);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
772 rf = (Sint32) SDL_SwapBE32(src[1]);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
773 ce = (lf / 2) + (rf / 2);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
774 dst[0] = src[0];
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
775 dst[1] = src[1];
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
776 dst[2] = SDL_SwapBE32((Uint32) (lf - ce));
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
777 dst[3] = SDL_SwapBE32((Uint32) (rf - ce));
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
778 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
779 } else {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
780 for (i = cvt->len_cvt / 8; i; --i) {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
781 dst -= 4;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
782 src -= 2;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
783 lf = (Sint32) SDL_SwapLE32(src[0]);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
784 rf = (Sint32) SDL_SwapLE32(src[1]);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
785 ce = (lf / 2) + (rf / 2);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
786 dst[0] = src[0];
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
787 dst[1] = src[1];
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
788 dst[2] = SDL_SwapLE32((Uint32) (lf - ce));
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
789 dst[3] = SDL_SwapLE32((Uint32) (rf - ce));
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
790 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
791 }
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
792 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
793 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
794 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
795 cvt->len_cvt *= 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
796 if (cvt->filters[++cvt->filter_index]) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
797 cvt->filters[cvt->filter_index] (cvt, format);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
798 }
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
799 }
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
800
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
801 /* Convert rate up by multiple of 2 */
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
802 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
803 SDL_RateMUL2(SDL_AudioCVT * cvt, SDL_AudioFormat format)
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
804 {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
805 int i;
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
806
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
807 #ifdef DEBUG_CONVERT
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
808 fprintf(stderr, "Converting audio rate * 2 (mono)\n");
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
809 #endif
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
810
1985
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
811 #define mul2_mono(type) { \
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
812 const type *src = (const type *) (cvt->buf + cvt->len_cvt); \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
813 type *dst = (type *) (cvt->buf + (cvt->len_cvt * 2)); \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
814 for (i = cvt->len_cvt / sizeof (type); i; --i) { \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
815 src--; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
816 dst[-1] = dst[-2] = src[0]; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
817 dst -= 2; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
818 } \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
819 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
820
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
821 switch (SDL_AUDIO_BITSIZE(format)) {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
822 case 8:
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
823 mul2_mono(Uint8);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
824 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
825 case 16:
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
826 mul2_mono(Uint16);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
827 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
828 case 32:
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
829 mul2_mono(Uint32);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
830 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
831 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
832
1985
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
833 #undef mul2_mono
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
834
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
835 cvt->len_cvt *= 2;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
836 if (cvt->filters[++cvt->filter_index]) {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
837 cvt->filters[cvt->filter_index] (cvt, format);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
838 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
839 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
840
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
841
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
842 /* Convert rate up by multiple of 2, for stereo */
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
843 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
844 SDL_RateMUL2_c2(SDL_AudioCVT * cvt, SDL_AudioFormat format)
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
845 {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
846 int i;
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
847
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
848 #ifdef DEBUG_CONVERT
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
849 fprintf(stderr, "Converting audio rate * 2 (stereo)\n");
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
850 #endif
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
851
1985
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
852 #define mul2_stereo(type) { \
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
853 const type *src = (const type *) (cvt->buf + cvt->len_cvt); \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
854 type *dst = (type *) (cvt->buf + (cvt->len_cvt * 2)); \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
855 for (i = cvt->len_cvt / (sizeof (type) * 2); i; --i) { \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
856 const type r = src[-1]; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
857 const type l = src[-2]; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
858 src -= 2; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
859 dst[-1] = r; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
860 dst[-2] = l; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
861 dst[-3] = r; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
862 dst[-4] = l; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
863 dst -= 4; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
864 } \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
865 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
866
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
867 switch (SDL_AUDIO_BITSIZE(format)) {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
868 case 8:
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
869 mul2_stereo(Uint8);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
870 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
871 case 16:
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
872 mul2_stereo(Uint16);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
873 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
874 case 32:
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
875 mul2_stereo(Uint32);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
876 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
877 }
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
878
1985
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
879 #undef mul2_stereo
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
880
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
881 cvt->len_cvt *= 2;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
882 if (cvt->filters[++cvt->filter_index]) {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
883 cvt->filters[cvt->filter_index] (cvt, format);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
884 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
885 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
886
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
887 /* Convert rate up by multiple of 2, for quad */
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
888 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
889 SDL_RateMUL2_c4(SDL_AudioCVT * cvt, SDL_AudioFormat format)
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
890 {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
891 int i;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
892
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
893 #ifdef DEBUG_CONVERT
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
894 fprintf(stderr, "Converting audio rate * 2 (quad)\n");
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
895 #endif
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
896
1985
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
897 #define mul2_quad(type) { \
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
898 const type *src = (const type *) (cvt->buf + cvt->len_cvt); \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
899 type *dst = (type *) (cvt->buf + (cvt->len_cvt * 2)); \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
900 for (i = cvt->len_cvt / (sizeof (type) * 4); i; --i) { \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
901 const type c1 = src[-1]; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
902 const type c2 = src[-2]; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
903 const type c3 = src[-3]; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
904 const type c4 = src[-4]; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
905 src -= 4; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
906 dst[-1] = c1; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
907 dst[-2] = c2; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
908 dst[-3] = c3; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
909 dst[-4] = c4; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
910 dst[-5] = c1; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
911 dst[-6] = c2; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
912 dst[-7] = c3; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
913 dst[-8] = c4; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
914 dst -= 8; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
915 } \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
916 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
917
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
918 switch (SDL_AUDIO_BITSIZE(format)) {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
919 case 8:
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
920 mul2_quad(Uint8);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
921 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
922 case 16:
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
923 mul2_quad(Uint16);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
924 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
925 case 32:
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
926 mul2_quad(Uint32);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
927 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
928 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
929
1985
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
930 #undef mul2_quad
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
931
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
932 cvt->len_cvt *= 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
933 if (cvt->filters[++cvt->filter_index]) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
934 cvt->filters[cvt->filter_index] (cvt, format);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
935 }
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
936 }
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
937
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
938
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
939 /* Convert rate up by multiple of 2, for 5.1 */
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
940 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
941 SDL_RateMUL2_c6(SDL_AudioCVT * cvt, SDL_AudioFormat format)
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
942 {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
943 int i;
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
944
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
945 #ifdef DEBUG_CONVERT
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
946 fprintf(stderr, "Converting audio rate * 2 (six channels)\n");
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
947 #endif
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
948
1985
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
949 #define mul2_chansix(type) { \
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
950 const type *src = (const type *) (cvt->buf + cvt->len_cvt); \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
951 type *dst = (type *) (cvt->buf + (cvt->len_cvt * 2)); \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
952 for (i = cvt->len_cvt / (sizeof (type) * 6); i; --i) { \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
953 const type c1 = src[-1]; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
954 const type c2 = src[-2]; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
955 const type c3 = src[-3]; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
956 const type c4 = src[-4]; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
957 const type c5 = src[-5]; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
958 const type c6 = src[-6]; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
959 src -= 6; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
960 dst[-1] = c1; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
961 dst[-2] = c2; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
962 dst[-3] = c3; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
963 dst[-4] = c4; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
964 dst[-5] = c5; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
965 dst[-6] = c6; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
966 dst[-7] = c1; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
967 dst[-8] = c2; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
968 dst[-9] = c3; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
969 dst[-10] = c4; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
970 dst[-11] = c5; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
971 dst[-12] = c6; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
972 dst -= 12; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
973 } \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
974 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
975
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
976 switch (SDL_AUDIO_BITSIZE(format)) {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
977 case 8:
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
978 mul2_chansix(Uint8);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
979 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
980 case 16:
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
981 mul2_chansix(Uint16);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
982 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
983 case 32:
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
984 mul2_chansix(Uint32);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
985 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
986 }
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
987
1985
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
988 #undef mul2_chansix
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
989
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
990 cvt->len_cvt *= 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
991 if (cvt->filters[++cvt->filter_index]) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
992 cvt->filters[cvt->filter_index] (cvt, format);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
993 }
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
994 }
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
995
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
996 /* Convert rate down by multiple of 2 */
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
997 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
998 SDL_RateDIV2(SDL_AudioCVT * cvt, SDL_AudioFormat format)
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
999 {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1000 int i;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
1001
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
1002 #ifdef DEBUG_CONVERT
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1003 fprintf(stderr, "Converting audio rate / 2 (mono)\n");
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
1004 #endif
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1005
1985
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
1006 #define div2_mono(type) { \
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1007 const type *src = (const type *) cvt->buf; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1008 type *dst = (type *) cvt->buf; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1009 for (i = cvt->len_cvt / (sizeof (type) * 2); i; --i) { \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1010 dst[0] = src[0]; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1011 src += 2; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1012 dst++; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1013 } \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1014 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1015
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1016 switch (SDL_AUDIO_BITSIZE(format)) {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1017 case 8:
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1018 div2_mono(Uint8);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1019 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1020 case 16:
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1021 div2_mono(Uint16);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1022 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1023 case 32:
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1024 div2_mono(Uint32);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1025 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1026 }
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1027
1985
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
1028 #undef div2_mono
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1029
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1030 cvt->len_cvt /= 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1031 if (cvt->filters[++cvt->filter_index]) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1032 cvt->filters[cvt->filter_index] (cvt, format);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1033 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
1034 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
1035
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
1036
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
1037 /* Convert rate down by multiple of 2, for stereo */
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1038 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1039 SDL_RateDIV2_c2(SDL_AudioCVT * cvt, SDL_AudioFormat format)
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
1040 {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1041 int i;
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
1042
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
1043 #ifdef DEBUG_CONVERT
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1044 fprintf(stderr, "Converting audio rate / 2 (stereo)\n");
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
1045 #endif
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1046
1985
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
1047 #define div2_stereo(type) { \
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1048 const type *src = (const type *) cvt->buf; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1049 type *dst = (type *) cvt->buf; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1050 for (i = cvt->len_cvt / (sizeof (type) * 4); i; --i) { \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1051 dst[0] = src[0]; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1052 dst[1] = src[1]; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1053 src += 4; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1054 dst += 2; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1055 } \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1056 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1057
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1058 switch (SDL_AUDIO_BITSIZE(format)) {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1059 case 8:
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1060 div2_stereo(Uint8);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1061 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1062 case 16:
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1063 div2_stereo(Uint16);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1064 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1065 case 32:
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1066 div2_stereo(Uint32);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1067 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1068 }
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1069
1985
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
1070 #undef div2_stereo
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1071
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1072 cvt->len_cvt /= 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1073 if (cvt->filters[++cvt->filter_index]) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1074 cvt->filters[cvt->filter_index] (cvt, format);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1075 }
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
1076 }
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
1077
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
1078
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
1079 /* Convert rate down by multiple of 2, for quad */
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1080 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1081 SDL_RateDIV2_c4(SDL_AudioCVT * cvt, SDL_AudioFormat format)
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
1082 {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1083 int i;
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
1084
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
1085 #ifdef DEBUG_CONVERT
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1086 fprintf(stderr, "Converting audio rate / 2 (quad)\n");
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
1087 #endif
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1088
1985
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
1089 #define div2_quad(type) { \
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1090 const type *src = (const type *) cvt->buf; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1091 type *dst = (type *) cvt->buf; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1092 for (i = cvt->len_cvt / (sizeof (type) * 8); i; --i) { \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1093 dst[0] = src[0]; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1094 dst[1] = src[1]; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1095 dst[2] = src[2]; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1096 dst[3] = src[3]; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1097 src += 8; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1098 dst += 4; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1099 } \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1100 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1101
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1102 switch (SDL_AUDIO_BITSIZE(format)) {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1103 case 8:
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1104 div2_quad(Uint8);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1105 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1106 case 16:
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1107 div2_quad(Uint16);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1108 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1109 case 32:
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1110 div2_quad(Uint32);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1111 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1112 }
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1113
1985
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
1114 #undef div2_quad
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1115
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1116 cvt->len_cvt /= 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1117 if (cvt->filters[++cvt->filter_index]) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1118 cvt->filters[cvt->filter_index] (cvt, format);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1119 }
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
1120 }
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
1121
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
1122 /* Convert rate down by multiple of 2, for 5.1 */
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1123 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1124 SDL_RateDIV2_c6(SDL_AudioCVT * cvt, SDL_AudioFormat format)
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
1125 {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1126 int i;
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
1127
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
1128 #ifdef DEBUG_CONVERT
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1129 fprintf(stderr, "Converting audio rate / 2 (six channels)\n");
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
1130 #endif
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1131
1985
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
1132 #define div2_chansix(type) { \
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1133 const type *src = (const type *) cvt->buf; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1134 type *dst = (type *) cvt->buf; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1135 for (i = cvt->len_cvt / (sizeof (type) * 12); i; --i) { \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1136 dst[0] = src[0]; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1137 dst[1] = src[1]; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1138 dst[2] = src[2]; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1139 dst[3] = src[3]; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1140 dst[4] = src[4]; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1141 dst[5] = src[5]; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1142 src += 12; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1143 dst += 6; \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1144 } \
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1145 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1146
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1147 switch (SDL_AUDIO_BITSIZE(format)) {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1148 case 8:
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1149 div2_chansix(Uint8);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1150 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1151 case 16:
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1152 div2_chansix(Uint16);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1153 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1154 case 32:
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1155 div2_chansix(Uint32);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1156 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1157 }
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1158
1985
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
1159 #undef div_chansix
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1160
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1161 cvt->len_cvt /= 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1162 if (cvt->filters[++cvt->filter_index]) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1163 cvt->filters[cvt->filter_index] (cvt, format);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1164 }
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
1165 }
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
1166
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
1167 /* Very slow rate conversion routine */
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1168 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1169 SDL_RateSLOW(SDL_AudioCVT * cvt, SDL_AudioFormat format)
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
1170 {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1171 double ipos;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1172 int i, clen;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
1173
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
1174 #ifdef DEBUG_CONVERT
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1175 fprintf(stderr, "Converting audio rate * %4.4f\n", 1.0 / cvt->rate_incr);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
1176 #endif
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1177 clen = (int) ((double) cvt->len_cvt / cvt->rate_incr);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1178 if (cvt->rate_incr > 1.0) {
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1179 switch (SDL_AUDIO_BITSIZE(format)) {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1180 case 8:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1181 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1182 Uint8 *output;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
1183
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1184 output = cvt->buf;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1185 ipos = 0.0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1186 for (i = clen; i; --i) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1187 *output = cvt->buf[(int) ipos];
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1188 ipos += cvt->rate_incr;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1189 output += 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1190 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1191 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1192 break;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
1193
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1194 case 16:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1195 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1196 Uint16 *output;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
1197
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1198 clen &= ~1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1199 output = (Uint16 *) cvt->buf;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1200 ipos = 0.0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1201 for (i = clen / 2; i; --i) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1202 *output = ((Uint16 *) cvt->buf)[(int) ipos];
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1203 ipos += cvt->rate_incr;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1204 output += 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1205 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1206 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1207 break;
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1208
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1209 case 32:
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1210 {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1211 /* !!! FIXME: need 32-bit converter here! */
2130
3ee59c43d784 Fixes for compiling with Visual C++ 8.0 Express Edition
Sam Lantinga <slouken@libsdl.org>
parents: 2078
diff changeset
1212 #ifdef DEBUG_CONVERT
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1213 fprintf(stderr, "FIXME: need 32-bit converter here!\n");
2130
3ee59c43d784 Fixes for compiling with Visual C++ 8.0 Express Edition
Sam Lantinga <slouken@libsdl.org>
parents: 2078
diff changeset
1214 #endif
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1215 }
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1216 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1217 } else {
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1218 switch (SDL_AUDIO_BITSIZE(format)) {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1219 case 8:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1220 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1221 Uint8 *output;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
1222
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1223 output = cvt->buf + clen;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1224 ipos = (double) cvt->len_cvt;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1225 for (i = clen; i; --i) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1226 ipos -= cvt->rate_incr;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1227 output -= 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1228 *output = cvt->buf[(int) ipos];
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1229 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1230 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1231 break;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
1232
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1233 case 16:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1234 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1235 Uint16 *output;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
1236
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1237 clen &= ~1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1238 output = (Uint16 *) (cvt->buf + clen);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1239 ipos = (double) cvt->len_cvt / 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1240 for (i = clen / 2; i; --i) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1241 ipos -= cvt->rate_incr;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1242 output -= 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1243 *output = ((Uint16 *) cvt->buf)[(int) ipos];
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1244 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1245 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1246 break;
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1247
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1248 case 32:
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1249 {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1250 /* !!! FIXME: need 32-bit converter here! */
2130
3ee59c43d784 Fixes for compiling with Visual C++ 8.0 Express Edition
Sam Lantinga <slouken@libsdl.org>
parents: 2078
diff changeset
1251 #ifdef DEBUG_CONVERT
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1252 fprintf(stderr, "FIXME: need 32-bit converter here!\n");
2130
3ee59c43d784 Fixes for compiling with Visual C++ 8.0 Express Edition
Sam Lantinga <slouken@libsdl.org>
parents: 2078
diff changeset
1253 #endif
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1254 }
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1255 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1256 }
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1257
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1258 cvt->len_cvt = clen;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1259 if (cvt->filters[++cvt->filter_index]) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1260 cvt->filters[cvt->filter_index] (cvt, format);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1261 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
1262 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
1263
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1264 int
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1265 SDL_ConvertAudio(SDL_AudioCVT * cvt)
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
1266 {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1267 /* Make sure there's data to convert */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1268 if (cvt->buf == NULL) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1269 SDL_SetError("No buffer allocated for conversion");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1270 return (-1);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1271 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1272 /* Return okay if no conversion is necessary */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1273 cvt->len_cvt = cvt->len;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1274 if (cvt->filters[0] == NULL) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1275 return (0);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1276 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
1277
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1278 /* Set up the conversion and go! */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1279 cvt->filter_index = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1280 cvt->filters[0] (cvt, cvt->src_format);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1281 return (0);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
1282 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
1283
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1284
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1285 static SDL_AudioFilter
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1286 SDL_HandTunedTypeCVT(SDL_AudioFormat src_fmt, SDL_AudioFormat dst_fmt)
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1287 {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1288 /*
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1289 * Fill in any future conversions that are specialized to a
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1290 * processor, platform, compiler, or library here.
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1291 */
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1292
1985
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
1293 return NULL; /* no specialized converter code available. */
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1294 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1295
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1296
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1297 /*
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1298 * Find a converter between two data types. We try to select a hand-tuned
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1299 * asm/vectorized/optimized function first, and then fallback to an
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1300 * autogenerated function that is customized to convert between two
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1301 * specific data types.
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1302 */
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1303 static int
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1304 SDL_BuildAudioTypeCVT(SDL_AudioCVT * cvt,
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1305 SDL_AudioFormat src_fmt, SDL_AudioFormat dst_fmt)
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1306 {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1307 if (src_fmt != dst_fmt) {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1308 const Uint16 src_bitsize = SDL_AUDIO_BITSIZE(src_fmt);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1309 const Uint16 dst_bitsize = SDL_AUDIO_BITSIZE(dst_fmt);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1310 SDL_AudioFilter filter = SDL_HandTunedTypeCVT(src_fmt, dst_fmt);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1311
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1312 /* No hand-tuned converter? Try the autogenerated ones. */
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1313 if (filter == NULL) {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1314 int i;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1315 for (i = 0; sdl_audio_type_filters[i].filter != NULL; i++) {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1316 const SDL_AudioTypeFilters *filt = &sdl_audio_type_filters[i];
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1317 if ((filt->src_fmt == src_fmt) && (filt->dst_fmt == dst_fmt)) {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1318 filter = filt->filter;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1319 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1320 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1321 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1322
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1323 if (filter == NULL) {
1985
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
1324 return -1; /* Still no matching converter?! */
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1325 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1326 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1327
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1328 /* Update (cvt) with filter details... */
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1329 cvt->filters[cvt->filter_index++] = filter;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1330 if (src_bitsize < dst_bitsize) {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1331 const int mult = (dst_bitsize / src_bitsize);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1332 cvt->len_mult *= mult;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1333 cvt->len_ratio *= mult;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1334 } else if (src_bitsize > dst_bitsize) {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1335 cvt->len_ratio /= (src_bitsize / dst_bitsize);
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1336 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1337
1985
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
1338 return 1; /* added a converter. */
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1339 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1340
1985
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
1341 return 0; /* no conversion necessary. */
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1342 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1343
2655
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1344 /* Generate the necessary IIR lowpass coefficients for resampling.
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1345 Assume that the SDL_AudioCVT struct is already set up with
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1346 the correct values for len_mult and len_div, and use the
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1347 type of dst_format. Also assume the buffer is allocated.
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1348 Note the buffer needs to be 6 units long.
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1349 For now, use RBJ's cookbook coefficients. It might be more
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1350 optimal to create a Butterworth filter, but this is more difficult.
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1351 */
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1352 int SDL_BuildIIRLowpass(SDL_AudioCVT * cvt, SDL_AudioFormat format) {
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1353 float fc; /* cutoff frequency */
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1354 float coeff[6]; /* floating point iir coefficients b0, b1, b2, a0, a1, a2 */
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1355 float scale;
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1356 float w0, alpha, cosw0;
2657
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1357 int i;
2655
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1358
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1359 /* The higher Q is, the higher CUTOFF can be. Need to find a good balance to avoid aliasing */
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1360 static const float Q = 5.0f;
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1361 static const float CUTOFF = 0.4f;
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1362
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1363 fc = (cvt->len_mult > cvt->len_div) ? CUTOFF / (float)cvt->len_mult : CUTOFF / (float)cvt->len_div;
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1364
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1365 w0 = 2.0f * M_PI * fc;
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1366 cosw0 = cosf(w0);
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1367 alpha = sin(w0) / (2.0f * Q);
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1368
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1369 /* Compute coefficients, normalizing by a0 */
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1370 scale = 1.0f / (1.0f + alpha);
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1371
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1372 coeff[0] = (1.0f - cosw0) / 2.0f * scale;
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1373 coeff[1] = (1.0f - cosw0) * scale;
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1374 coeff[2] = coeff[0];
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1375
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1376 coeff[3] = 1.0f; /* a0 is normalized to 1 */
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1377 coeff[4] = -2.0f * cosw0 * scale;
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1378 coeff[5] = (1.0f - alpha) * scale;
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1379
2656
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1380 /* Copy the coefficients to the struct. If necessary, convert coefficients to fixed point, using the range (-2.0, 2.0) */
2657
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1381 #define convert_fixed(type, fix) { \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1382 type *cvt_coeff = (type *)cvt->coeff; \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1383 for(i = 0; i < 6; ++i) { \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1384 cvt_coeff[i] = fix(coeff[i]); \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1385 } \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1386 }
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1387
2656
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1388 if(SDL_AUDIO_ISFLOAT(format) && SDL_AUDIO_BITSIZE(format) == 32) {
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1389 float *cvt_coeff = (float *)cvt->coeff;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1390 for(i = 0; i < 6; ++i) {
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1391 cvt_coeff[i] = coeff[i];
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1392 }
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1393 } else {
2657
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1394 switch(SDL_AUDIO_BITSIZE(format)) {
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1395 case 8:
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1396 convert_fixed(Uint8, SDL_Make_2_6);
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1397 break;
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1398 case 16:
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1399 convert_fixed(Uint16, SDL_Make_2_14);
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1400 break;
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1401 case 32:
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1402 convert_fixed(Uint32, SDL_Make_2_30);
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1403 break;
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1404 }
2656
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1405 }
2655
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1406
2657
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1407 #ifdef DEBUG_CONVERT
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1408 #define debug_iir(type) { \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1409 type *cvt_coeff = (type *)cvt->coeff; \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1410 for(i = 0; i < 6; ++i) { \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1411 printf("coeff[%u] = %f = 0x%x\n", i, coeff[i], cvt_coeff[i]); \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1412 } \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1413 }
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1414 if(SDL_AUDIO_ISFLOAT(format) && SDL_AUDIO_BITSIZE(format) == 32) {
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1415 float *cvt_coeff = (float *)cvt->coeff;
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1416 for(i = 0; i < 6; ++i) { \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1417 printf("coeff[%u] = %f = %f\n", i, coeff[i], cvt_coeff[i]); \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1418 }
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1419 } else {
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1420 switch(SDL_AUDIO_BITSIZE(format)) {
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1421 case 8:
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1422 debug_iir(Uint8);
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1423 break;
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1424 case 16:
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1425 debug_iir(Uint16);
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1426 break;
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1427 case 32:
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1428 debug_iir(Uint32);
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1429 break;
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1430 }
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1431 }
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1432 #undef debug_iir
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1433 #endif
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1434
2655
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1435 /* Initialize the state buffer to all zeroes, and set initial position */
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1436 memset(cvt->state_buf, 0, 4 * SDL_AUDIO_BITSIZE(format) / 4);
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1437 cvt->state_pos = 0;
2657
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1438 #undef convert_fixed
2655
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1439 }
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1440
2656
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1441 /* Apply the lowpass IIR filter to the given SDL_AudioCVT struct */
2657
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1442 static void SDL_FilterIIR(SDL_AudioCVT * cvt, SDL_AudioFormat format) {
2656
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1443 int i, n;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1444
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1445 n = cvt->len_cvt / (SDL_AUDIO_BITSIZE(format) / 4);
2657
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1446
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1447 /* Note that the coefficients are 2_x and the input is 1_x. Do we need to shift left at the end here? */
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1448 #define iir_fix(type, mult) {\
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1449 type *coeff = (type *)cvt->coeff; \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1450 type *state = (type *)cvt->state_buf; \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1451 type *buf = (type *)cvt->buf; \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1452 type temp; \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1453 for(i = 0; i < n; ++i) { \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1454 temp = buf[n] >> 1; \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1455 if(cvt->state_pos) { \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1456 buf[n] = mult(coeff[0], temp) + mult(coeff[1], state[0]) + mult(coeff[2], state[1]) - mult(coeff[4], state[2]) - mult(coeff[5], state[3]); \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1457 state[1] = temp; \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1458 state[3] = buf[n]; \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1459 cvt->state_pos = 0; \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1460 } else { \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1461 buf[n] = mult(coeff[0], temp) + mult(coeff[1], state[1]) +mult(coeff[2], state[0]) - mult(coeff[4], state[3]) - mult(coeff[5], state[2]); \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1462 state[0] = temp; \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1463 state[2] = buf[n]; \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1464 cvt->state_pos = 0; \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1465 } \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1466 } \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1467 }
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1468
2656
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1469 if(SDL_AUDIO_ISFLOAT(format) && SDL_AUDIO_BITSIZE(format) == 32) {
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1470 float *coeff = (float *)cvt->coeff;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1471 float *state = (float *)cvt->state_buf;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1472 float *buf = (float *)cvt->buf;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1473 float temp;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1474
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1475 for(i = 0; i < n; ++i) {
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1476 /* y[n] = b0 * x[n] + b1 * x[n-1] + b2 * x[n-2] - a1 * y[n-1] - a[2] * y[n-2] */
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1477 temp = buf[n];
2657
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1478 if(cvt->state_pos) {
2656
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1479 buf[n] = coeff[0] * buf[n] + coeff[1] * state[0] + coeff[2] * state[1] - coeff[4] * state[2] - coeff[5] * state[3];
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1480 state[1] = temp;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1481 state[3] = buf[n];
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1482 cvt->state_pos = 0;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1483 } else {
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1484 buf[n] = coeff[0] * buf[n] + coeff[1] * state[1] + coeff[2] * state[0] - coeff[4] * state[3] - coeff[5] * state[2];
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1485 state[0] = temp;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1486 state[2] = buf[n];
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1487 cvt->state_pos = 1;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1488 }
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1489 }
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1490 } else {
2657
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1491 switch(SDL_AUDIO_BITSIZE(format)) {
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1492 case 8:
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1493 iir_fix(Uint8, SDL_FixMpy8);
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1494 break;
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1495 case 16:
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1496 iir_fix(Uint16, SDL_FixMpy16);
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1497 break;
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1498 case 32:
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1499 iir_fix(Uint32, SDL_FixMpy32);
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1500 break;
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1501 }
2656
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1502 }
2657
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1503 #undef iir_fix
2656
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1504 }
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1505
2655
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1506 /* Apply the windowed sinc FIR filter to the given SDL_AudioCVT struct */
2657
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1507 static void SDL_FilterFIR(SDL_AudioCVT * cvt, SDL_AudioFormat format) {
2655
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1508 int n = cvt->len_cvt / (SDL_AUDIO_BITSIZE(format) / 4);
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1509 int m = cvt->len_sinc;
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1510 int i, j;
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1511
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1512 /* Note: this makes use of the symmetry of the sinc filter.
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1513 We can also make a big optimization here by taking advantage
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1514 of the fact that the signal is zero stuffed, so we can do
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1515 significantly fewer multiplications and additions.
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1516 */
2657
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1517 #define filter_sinc(type, mult) { \
2656
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1518 type *sinc = (type *)cvt->coeff; \
2655
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1519 type *state = (type *)cvt->state_buf; \
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1520 type *buf = (type *)cvt->buf; \
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1521 for(i = 0; i < n; ++i) { \
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1522 if(cvt->state_pos == m) cvt->state_pos = 0; \
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1523 buf[i] = 0; \
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1524 for(j = 0; j < m; ++j) { \
2657
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1525 buf[i] += mult(state[j], sinc[j]); \
2655
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1526 } \
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1527 } \
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1528 }
2656
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1529
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1530 /* If it's floating point, we don't need to do any shifting */
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1531 if(SDL_AUDIO_ISFLOAT(format) && SDL_AUDIO_BITSIZE(format) == 32) {
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1532 float *sinc = (float *)cvt->coeff;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1533 float *state = (float *)cvt->state_buf;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1534 float *buf = (float *)cvt->buf;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1535
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1536 for(i = 0; i < n; ++i) {
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1537 state[cvt->state_pos++] = buf[i];
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1538 if(cvt->state_pos == m) cvt->state_pos = 0;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1539 buf[i] = 0.0f;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1540 for(j = 0; j < m; ++j) {
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1541 buf[i] += state[j] * sinc[j];
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1542 }
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1543 }
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1544 } else {
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1545 switch (SDL_AUDIO_BITSIZE(format)) {
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1546 case 8:
2657
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1547 filter_sinc(Uint8, SDL_FixMpy8);
2656
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1548 break;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1549 case 16:
2657
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1550 filter_sinc(Uint16, SDL_FixMpy16);
2656
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1551 break;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1552 case 32:
2657
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1553 filter_sinc(Uint32, SDL_FixMpy32);
2656
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1554 break;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1555 }
2655
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1556 }
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1557
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1558 #undef filter_sinc
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1559
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1560 }
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1561
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1562 /* Generate the necessary windowed sinc filter for resampling.
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1563 Assume that the SDL_AudioCVT struct is already set up with
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1564 the correct values for len_mult and len_div, and use the
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1565 type of dst_format. Also assume the buffer is allocated.
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1566 Note the buffer needs to be m+1 units long.
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1567 */
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1568 int
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1569 SDL_BuildWindowedSinc(SDL_AudioCVT * cvt, SDL_AudioFormat format, unsigned int m) {
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1570 float fScale; /* scale factor for fixed point */
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1571 float *fSinc; /* floating point sinc buffer, to be converted to fixed point */
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1572 float fc; /* cutoff frequency */
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1573 float two_pi_fc, two_pi_over_m, four_pi_over_m, m_over_two;
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1574 float norm_sum, norm_fact;
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1575 unsigned int i;
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1576
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1577 /* Check that the buffer is allocated */
2656
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1578 if( cvt->coeff == NULL ) {
2655
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1579 return -1;
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1580 }
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1581
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1582 /* Set the length */
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1583 cvt->len_sinc = m;
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1584
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1585 /* Allocate the floating point windowed sinc. */
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1586 fSinc = (float *)malloc(m * sizeof(float));
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1587 if( fSinc == NULL ) {
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1588 return -1;
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1589 }
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1590
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1591 /* Set up the filter parameters */
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1592 fc = (cvt->len_mult > cvt->len_div) ? 0.5f / (float)cvt->len_mult : 0.5f / (float)cvt->len_div;
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1593 two_pi_fc = 2.0f * M_PI * fc;
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1594 two_pi_over_m = 2.0f * M_PI / (float)m;
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1595 four_pi_over_m = 2.0f * two_pi_over_m;
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1596 m_over_two = (float)m / 2.0f;
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1597 norm_sum = 0.0f;
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1598
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1599 for(i = 0; i <= m; ++i ) {
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1600 if( i == m/2 ) {
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1601 fSinc[i] = two_pi_fc;
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1602 } else {
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1603 fSinc[i] = sinf(two_pi_fc * ((float)i - m_over_two)) / ((float)i - m_over_two);
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1604 /* Apply blackman window */
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1605 fSinc[i] *= 0.42f - 0.5f * cosf(two_pi_over_m * (float)i) + 0.08f * cosf(four_pi_over_m * (float)i);
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1606 }
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1607 norm_sum += abs(fSinc[i]);
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1608 }
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1609
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1610 /* Now normalize and convert to fixed point. We scale everything to half the precision
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1611 of whatever datatype we're using, for example, 16 bit data means we use 8 bits */
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1612
2657
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1613 #define convert_fixed(type, fix) { \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1614 norm_fact = 1.0f / norm_sum; \
2656
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1615 type *dst = (type *)cvt->coeff; \
2655
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1616 for( i = 0; i <= m; ++i ) { \
2657
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1617 dst[i] = fix(fSinc[i] * norm_fact); \
2655
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1618 } \
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1619 }
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1620
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1621 /* If we're using floating point, we only need to normalize */
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1622 if(SDL_AUDIO_ISFLOAT(format) && SDL_AUDIO_BITSIZE(format) == 32) {
2656
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1623 float *fDest = (float *)cvt->coeff;
2655
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1624 norm_fact = 1.0f / norm_sum;
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1625 for(i = 0; i <= m; ++i) {
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1626 fDest[i] = fSinc[i] * norm_fact;
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1627 }
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1628 } else {
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1629 switch (SDL_AUDIO_BITSIZE(format)) {
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1630 case 8:
2657
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1631 convert_fixed(Uint8, SDL_Make_1_7);
2655
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1632 break;
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1633 case 16:
2657
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1634 convert_fixed(Uint16, SDL_Make_1_15);
2655
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1635 break;
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1636 case 32:
2657
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1637 convert_fixed(Uint32, SDL_Make_1_31);
2655
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1638 break;
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1639 }
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1640 }
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1641
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1642 /* Initialize the state buffer to all zeroes, and set initial position */
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1643 memset(cvt->state_buf, 0, cvt->len_sinc * SDL_AUDIO_BITSIZE(format) / 4);
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1644 cvt->state_pos = 0;
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1645
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1646 /* Clean up */
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1647 #undef convert_fixed
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1648 free(fSinc);
b8e736c8a5a8 Added beginnings of resampling code.
Aaron Wishnick <schnarf@gmail.com>
parents: 2130
diff changeset
1649 }
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1650
2656
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1651 /* This is used to reduce the resampling ratio */
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1652 inline int SDL_GCD(int a, int b) {
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1653 int temp;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1654 while(b != 0) {
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1655 temp = a % b;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1656 a = b;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1657 b = temp;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1658 }
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1659 return a;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1660 }
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1661
2657
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1662 /* Perform proper resampling */
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1663 static void SDLCALL
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1664 SDL_Resample(SDL_AudioCVT * cvt, SDL_AudioFormat format)
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1665 {
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1666 int i, j;
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1667
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1668 #ifdef DEBUG_CONVERT
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1669 printf("Converting audio rate via proper resampling (mono)\n");
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1670 #endif
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1671
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1672 #define zerostuff_mono(type) { \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1673 const type *src = (const type *) (cvt->buf + cvt->len_cvt); \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1674 type *dst = (type *) (cvt->buf + (cvt->len_cvt * cvt->len_mult)); \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1675 for (i = cvt->len_cvt / sizeof (type); i; --i) { \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1676 src--; \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1677 dst[-1] = src[0]; \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1678 for( j = -cvt->len_mult; j < -1; ++j ) { \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1679 dst[j] = 0; \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1680 } \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1681 dst -= cvt->len_mult; \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1682 } \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1683 }
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1684
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1685 #define discard_mono(type) { \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1686 const type *src = (const type *) (cvt->buf); \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1687 type *dst = (type *) (cvt->buf); \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1688 for (i = 0; i < cvt->len_cvt / cvt->len_div / sizeof (type); ++i) { \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1689 dst[0] = src[0]; \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1690 src += cvt->len_div; \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1691 ++dst; \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1692 } \
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1693 }
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1694
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1695 // Step 1: Zero stuff the conversion buffer
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1696 #ifdef DEBUG_CONVERT
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1697 printf("Zero-stuffing by a factor of %u\n", cvt->len_mult);
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1698 #endif
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1699 switch (SDL_AUDIO_BITSIZE(format)) {
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1700 case 8:
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1701 zerostuff_mono(Uint8);
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1702 break;
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1703 case 16:
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1704 zerostuff_mono(Uint16);
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1705 break;
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1706 case 32:
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1707 zerostuff_mono(Uint32);
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1708 break;
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1709 }
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1710
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1711 cvt->len_cvt *= cvt->len_mult;
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1712
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1713 // Step 2: Use either a windowed sinc FIR filter or IIR lowpass filter to remove all alias frequencies
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1714 SDL_FilterIIR( cvt, format );
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1715
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1716 // Step 3: Discard unnecessary samples
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1717 #ifdef DEBUG_CONVERT
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1718 printf("Discarding samples by a factor of %u\n", cvt->len_div);
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1719 #endif
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1720 switch (SDL_AUDIO_BITSIZE(format)) {
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1721 case 8:
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1722 discard_mono(Uint8);
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1723 break;
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1724 case 16:
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1725 discard_mono(Uint16);
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1726 break;
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1727 case 32:
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1728 discard_mono(Uint32);
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1729 break;
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1730 }
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1731
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1732 #undef zerostuff_mono
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1733 #undef discard_mono
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1734
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1735 cvt->len_cvt /= cvt->len_div;
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1736
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1737 if (cvt->filters[++cvt->filter_index]) {
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1738 cvt->filters[cvt->filter_index] (cvt, format);
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1739 }
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1740 }
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1741
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1742
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1743 /* Creates a set of audio filters to convert from one format to another.
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1744 Returns -1 if the format conversion is not supported, 0 if there's
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1745 no conversion needed, or 1 if the audio filter is set up.
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
1746 */
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1747
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1748 int
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1749 SDL_BuildAudioCVT(SDL_AudioCVT * cvt,
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1750 SDL_AudioFormat src_fmt, Uint8 src_channels, int src_rate,
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1751 SDL_AudioFormat dst_fmt, Uint8 dst_channels, int dst_rate)
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
1752 {
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1753 /* there are no unsigned types over 16 bits, so catch this upfront. */
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1754 if ((SDL_AUDIO_BITSIZE(src_fmt) > 16) && (!SDL_AUDIO_ISSIGNED(src_fmt))) {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1755 return -1;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1756 }
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1757 if ((SDL_AUDIO_BITSIZE(dst_fmt) > 16) && (!SDL_AUDIO_ISSIGNED(dst_fmt))) {
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1758 return -1;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1759 }
1985
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
1760 #ifdef DEBUG_CONVERT
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1761 printf("Build format %04x->%04x, channels %u->%u, rate %d->%d\n",
1985
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
1762 src_fmt, dst_fmt, src_channels, dst_channels, src_rate, dst_rate);
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
1763 #endif
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1764
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1765 /* Start off with no conversion necessary */
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1766
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1767 cvt->src_format = src_fmt;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1768 cvt->dst_format = dst_fmt;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1769 cvt->needed = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1770 cvt->filter_index = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1771 cvt->filters[0] = NULL;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1772 cvt->len_mult = 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1773 cvt->len_ratio = 1.0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1774
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1775 /* Convert data types, if necessary. Updates (cvt). */
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1776 if (SDL_BuildAudioTypeCVT(cvt, src_fmt, dst_fmt) == -1)
1985
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1982
diff changeset
1777 return -1; /* shouldn't happen, but just in case... */
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
1778
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1779 /* Channel conversion */
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1780 if (src_channels != dst_channels) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1781 if ((src_channels == 1) && (dst_channels > 1)) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1782 cvt->filters[cvt->filter_index++] = SDL_ConvertStereo;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1783 cvt->len_mult *= 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1784 src_channels = 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1785 cvt->len_ratio *= 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1786 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1787 if ((src_channels == 2) && (dst_channels == 6)) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1788 cvt->filters[cvt->filter_index++] = SDL_ConvertSurround;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1789 src_channels = 6;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1790 cvt->len_mult *= 3;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1791 cvt->len_ratio *= 3;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1792 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1793 if ((src_channels == 2) && (dst_channels == 4)) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1794 cvt->filters[cvt->filter_index++] = SDL_ConvertSurround_4;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1795 src_channels = 4;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1796 cvt->len_mult *= 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1797 cvt->len_ratio *= 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1798 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1799 while ((src_channels * 2) <= dst_channels) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1800 cvt->filters[cvt->filter_index++] = SDL_ConvertStereo;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1801 cvt->len_mult *= 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1802 src_channels *= 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1803 cvt->len_ratio *= 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1804 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1805 if ((src_channels == 6) && (dst_channels <= 2)) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1806 cvt->filters[cvt->filter_index++] = SDL_ConvertStrip;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1807 src_channels = 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1808 cvt->len_ratio /= 3;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1809 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1810 if ((src_channels == 6) && (dst_channels == 4)) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1811 cvt->filters[cvt->filter_index++] = SDL_ConvertStrip_2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1812 src_channels = 4;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1813 cvt->len_ratio /= 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1814 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1815 /* This assumes that 4 channel audio is in the format:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1816 Left {front/back} + Right {front/back}
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1817 so converting to L/R stereo works properly.
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1818 */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1819 while (((src_channels % 2) == 0) &&
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1820 ((src_channels / 2) >= dst_channels)) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1821 cvt->filters[cvt->filter_index++] = SDL_ConvertMono;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1822 src_channels /= 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1823 cvt->len_ratio /= 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1824 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1825 if (src_channels != dst_channels) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1826 /* Uh oh.. */ ;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1827 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1828 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
1829
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1830 /* Do rate conversion */
2656
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1831 int rate_gcd;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1832 rate_gcd = SDL_GCD(src_rate, dst_rate);
2657
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1833 cvt->len_mult = 2 * dst_rate / rate_gcd;
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1834 cvt->len_div = 2 * src_rate / rate_gcd;
2656
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1835 cvt->len_ratio = (double)cvt->len_mult / (double)cvt->len_div;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1836 cvt->filters[cvt->filter_index++] = SDL_Resample;
2657
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1837 SDL_BuildIIRLowpass(cvt, dst_fmt);
2656
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1838
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1839 /*cvt->rate_incr = 0.0;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1840 if ((src_rate / 100) != (dst_rate / 100)) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1841 Uint32 hi_rate, lo_rate;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1842 int len_mult;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1843 double len_ratio;
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1844 SDL_AudioFilter rate_cvt = NULL;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
1845
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1846 if (src_rate > dst_rate) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1847 hi_rate = src_rate;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1848 lo_rate = dst_rate;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1849 switch (src_channels) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1850 case 1:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1851 rate_cvt = SDL_RateDIV2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1852 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1853 case 2:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1854 rate_cvt = SDL_RateDIV2_c2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1855 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1856 case 4:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1857 rate_cvt = SDL_RateDIV2_c4;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1858 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1859 case 6:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1860 rate_cvt = SDL_RateDIV2_c6;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1861 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1862 default:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1863 return -1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1864 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1865 len_mult = 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1866 len_ratio = 0.5;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1867 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1868 hi_rate = dst_rate;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1869 lo_rate = src_rate;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1870 switch (src_channels) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1871 case 1:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1872 rate_cvt = SDL_RateMUL2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1873 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1874 case 2:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1875 rate_cvt = SDL_RateMUL2_c2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1876 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1877 case 4:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1878 rate_cvt = SDL_RateMUL2_c4;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1879 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1880 case 6:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1881 rate_cvt = SDL_RateMUL2_c6;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1882 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1883 default:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1884 return -1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1885 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1886 len_mult = 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1887 len_ratio = 2.0;
2656
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1888 }*/
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1889 /* If hi_rate = lo_rate*2^x then conversion is easy */
2656
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1890 /*while (((lo_rate * 2) / 100) <= (hi_rate / 100)) {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1891 cvt->filters[cvt->filter_index++] = rate_cvt;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1892 cvt->len_mult *= len_mult;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1893 lo_rate *= 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1894 cvt->len_ratio *= len_ratio;
2656
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1895 }*/
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1896 /* We may need a slow conversion here to finish up */
2656
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1897 /*if ((lo_rate / 100) != (hi_rate / 100)) {*/
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1898 #if 1
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1899 /* The problem with this is that if the input buffer is
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1900 say 1K, and the conversion rate is say 1.1, then the
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1901 output buffer is 1.1K, which may not be an acceptable
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1902 buffer size for the audio driver (not a power of 2)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1903 */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1904 /* For now, punt and hope the rate distortion isn't great.
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1905 */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1906 #else
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1907 if (src_rate < dst_rate) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1908 cvt->rate_incr = (double) lo_rate / hi_rate;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1909 cvt->len_mult *= 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1910 cvt->len_ratio /= cvt->rate_incr;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1911 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1912 cvt->rate_incr = (double) hi_rate / lo_rate;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1913 cvt->len_ratio *= cvt->rate_incr;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1914 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1915 cvt->filters[cvt->filter_index++] = SDL_RateSLOW;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1916 #endif
2656
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1917 /* }
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
Aaron Wishnick <schnarf@gmail.com>
parents: 2655
diff changeset
1918 }*/
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
1919
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1920 /* Set up the filter information */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1921 if (cvt->filter_index != 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1922 cvt->needed = 1;
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1923 cvt->src_format = src_fmt;
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
1924 cvt->dst_format = dst_fmt;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1925 cvt->len = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1926 cvt->buf = NULL;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1927 cvt->filters[cvt->filter_index] = NULL;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1928 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1929 return (cvt->needed);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1930 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
1931
2657
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1932 #undef SDL_FixMpy8
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1933 #undef SDL_FixMpy16
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1934 #undef SDL_FixMpy32
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1935 #undef SDL_Make_1_7
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1936 #undef SDL_Make_1_15
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1937 #undef SDL_Make_1_31
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1938 #undef SDL_Make_2_6
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1939 #undef SDL_Make_2_14
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1940 #undef SDL_Make_2_30
29306e52dab8 Implemented a lot of fixed point code for the filters. The SDL_FixMpy functions currently don't work properly -- there are some issues with signed vs unsigned.
Aaron Wishnick <schnarf@gmail.com>
parents: 2656
diff changeset
1941
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1769
diff changeset
1942 /* vi: set ts=4 sw=4 expandtab: */