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annotate src/audio/SDL_mixer.c @ 1713:3e66ed1690e4 SDL-1.3

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Whoops, forgot to indent
author Sam Lantinga <slouken@libsdl.org>
date Mon, 26 Jun 2006 14:29:50 +0000
parents 4da1ee79c9af
children
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
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24 /* This provides the default mixing callback for the SDL audio routines */
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25
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26 #include "SDL_cpuinfo.h"
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27 #include "SDL_timer.h"
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28 #include "SDL_audio.h"
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29 #include "SDL_sysaudio.h"
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30 #include "SDL_mixer_MMX.h"
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31 #include "SDL_mixer_MMX_VC.h"
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32 #include "SDL_mixer_m68k.h"
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33
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34 /* This table is used to add two sound values together and pin
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35 * the value to avoid overflow. (used with permission from ARDI)
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36 * Changed to use 0xFE instead of 0xFF for better sound quality.
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37 */
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38 static const Uint8 mix8[] = {
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39 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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40 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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41 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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42 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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43 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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44 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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45 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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46 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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47 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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48 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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49 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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50 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x03,
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51 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E,
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52 0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,
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53 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20, 0x21, 0x22, 0x23, 0x24,
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54 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F,
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55 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A,
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56 0x3B, 0x3C, 0x3D, 0x3E, 0x3F, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45,
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57 0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50,
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58 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x5B,
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59 0x5C, 0x5D, 0x5E, 0x5F, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66,
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60 0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71,
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61 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x7B, 0x7C,
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62 0x7D, 0x7E, 0x7F, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
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63 0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F, 0x90, 0x91, 0x92,
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64 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9A, 0x9B, 0x9C, 0x9D,
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65 0x9E, 0x9F, 0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8,
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66 0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF, 0xB0, 0xB1, 0xB2, 0xB3,
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67 0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD, 0xBE,
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68 0xBF, 0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9,
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69 0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF, 0xD0, 0xD1, 0xD2, 0xD3, 0xD4,
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70 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF,
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71 0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA,
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72 0xEB, 0xEC, 0xED, 0xEE, 0xEF, 0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5,
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73 0xF6, 0xF7, 0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFE, 0xFE,
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74 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
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75 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
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76 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
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77 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
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78 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
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79 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
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80 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
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81 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
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82 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
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83 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
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84 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
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85 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE
0
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86 };
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87
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88 /* The volume ranges from 0 - 128 */
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89 #define ADJUST_VOLUME(s, v) (s = (s*v)/SDL_MIX_MAXVOLUME)
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90 #define ADJUST_VOLUME_U8(s, v) (s = (((s-128)*v)/SDL_MIX_MAXVOLUME)+128)
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91
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92 void
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93 SDL_MixAudio(Uint8 * dst, const Uint8 * src, Uint32 len, int volume)
0
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94 {
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95 Uint16 format;
0
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96
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97 if (volume == 0) {
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98 return;
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99 }
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100 /* Mix the user-level audio format */
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101 if (current_audio) {
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102 if (current_audio->convert.needed) {
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103 format = current_audio->convert.src_format;
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104 } else {
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105 format = current_audio->spec.format;
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106 }
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107 } else {
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108 /* HACK HACK HACK */
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109 format = AUDIO_S16;
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110 }
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111 switch (format) {
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112
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113 case AUDIO_U8:
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114 {
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115 #if defined(__GNUC__) && defined(__M68000__) && defined(SDL_ASSEMBLY_ROUTINES)
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116 SDL_MixAudio_m68k_U8((char *) dst, (char *) src,
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117 (unsigned long) len, (long) volume,
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118 (char *) mix8);
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119 #else
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120 Uint8 src_sample;
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121
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122 while (len--) {
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123 src_sample = *src;
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124 ADJUST_VOLUME_U8(src_sample, volume);
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125 *dst = mix8[*dst + src_sample];
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126 ++dst;
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127 ++src;
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128 }
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129 #endif
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130 }
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131 break;
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132
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133 case AUDIO_S8:
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134 {
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135 #if defined(__GNUC__) && defined(__i386__) && defined(SDL_ASSEMBLY_ROUTINES)
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136 if (SDL_HasMMX()) {
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137 SDL_MixAudio_MMX_S8((char *) dst, (char *) src,
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138 (unsigned int) len, (int) volume);
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139 } else
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140 #elif ((defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)) && defined(SDL_ASSEMBLY_ROUTINES)
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141 if (SDL_HasMMX()) {
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142 SDL_MixAudio_MMX_S8_VC((char *) dst, (char *) src,
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143 (unsigned int) len, (int) volume);
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144 } else
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145 #endif
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146 #if defined(__GNUC__) && defined(__M68000__) && defined(SDL_ASSEMBLY_ROUTINES)
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147 SDL_MixAudio_m68k_S8((char *) dst, (char *) src,
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148 (unsigned long) len, (long) volume);
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149 #else
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150 {
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151 Sint8 *dst8, *src8;
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152 Sint8 src_sample;
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153 int dst_sample;
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154 const int max_audioval = ((1 << (8 - 1)) - 1);
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155 const int min_audioval = -(1 << (8 - 1));
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156
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157 src8 = (Sint8 *) src;
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158 dst8 = (Sint8 *) dst;
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159 while (len--) {
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160 src_sample = *src8;
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161 ADJUST_VOLUME(src_sample, volume);
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162 dst_sample = *dst8 + src_sample;
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163 if (dst_sample > max_audioval) {
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164 *dst8 = max_audioval;
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165 } else if (dst_sample < min_audioval) {
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166 *dst8 = min_audioval;
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167 } else {
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168 *dst8 = dst_sample;
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169 }
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170 ++dst8;
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171 ++src8;
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172 }
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173 }
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174 #endif
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175 }
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176 break;
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177
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178 case AUDIO_S16LSB:
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179 {
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180 #if defined(__GNUC__) && defined(__i386__) && defined(SDL_ASSEMBLY_ROUTINES)
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181 if (SDL_HasMMX()) {
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182 SDL_MixAudio_MMX_S16((char *) dst, (char *) src,
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183 (unsigned int) len, (int) volume);
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184 } else
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185 #elif ((defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)) && defined(SDL_ASSEMBLY_ROUTINES)
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186 if (SDL_HasMMX()) {
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187 SDL_MixAudio_MMX_S16_VC((char *) dst, (char *) src,
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188 (unsigned int) len, (int) volume);
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189 } else
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190 #endif
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191 #if defined(__GNUC__) && defined(__M68000__) && defined(SDL_ASSEMBLY_ROUTINES)
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192 SDL_MixAudio_m68k_S16LSB((short *) dst, (short *) src,
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193 (unsigned long) len, (long) volume);
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194 #else
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195 {
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196 Sint16 src1, src2;
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197 int dst_sample;
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198 const int max_audioval = ((1 << (16 - 1)) - 1);
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199 const int min_audioval = -(1 << (16 - 1));
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200
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201 len /= 2;
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202 while (len--) {
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203 src1 = ((src[1]) << 8 | src[0]);
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204 ADJUST_VOLUME(src1, volume);
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205 src2 = ((dst[1]) << 8 | dst[0]);
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206 src += 2;
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207 dst_sample = src1 + src2;
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208 if (dst_sample > max_audioval) {
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209 dst_sample = max_audioval;
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210 } else if (dst_sample < min_audioval) {
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211 dst_sample = min_audioval;
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212 }
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213 dst[0] = dst_sample & 0xFF;
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214 dst_sample >>= 8;
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215 dst[1] = dst_sample & 0xFF;
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216 dst += 2;
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217 }
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218 }
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219 #endif
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220 }
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221 break;
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222
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223 case AUDIO_S16MSB:
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224 {
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225 #if defined(__GNUC__) && defined(__M68000__) && defined(SDL_ASSEMBLY_ROUTINES)
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226 SDL_MixAudio_m68k_S16MSB((short *) dst, (short *) src,
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227 (unsigned long) len, (long) volume);
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228 #else
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229 Sint16 src1, src2;
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230 int dst_sample;
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231 const int max_audioval = ((1 << (16 - 1)) - 1);
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232 const int min_audioval = -(1 << (16 - 1));
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234 len /= 2;
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235 while (len--) {
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236 src1 = ((src[0]) << 8 | src[1]);
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237 ADJUST_VOLUME(src1, volume);
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238 src2 = ((dst[0]) << 8 | dst[1]);
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239 src += 2;
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240 dst_sample = src1 + src2;
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241 if (dst_sample > max_audioval) {
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242 dst_sample = max_audioval;
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243 } else if (dst_sample < min_audioval) {
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244 dst_sample = min_audioval;
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245 }
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246 dst[1] = dst_sample & 0xFF;
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247 dst_sample >>= 8;
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248 dst[0] = dst_sample & 0xFF;
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249 dst += 2;
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250 }
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251 #endif
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252 }
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253 break;
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255 default: /* If this happens... FIXME! */
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256 SDL_SetError("SDL_MixAudio(): unknown audio format");
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257 return;
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258 }
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259 }
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260
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261 /* vi: set ts=4 sw=4 expandtab: */