sdl-ios-xcode: src/audio/SDL_audiocvt.c annotate

annotate src/audio/SDL_audiocvt.c @ 2716:f8f68f47285a

Final merge of Google Summer of Code 2008 work... Audio Ideas - Resampling and Pitch Shifting by Aaron Wishnick, mentored by Ryan C. Gordon

author	Sam Lantinga <slouken@libsdl.org>
date	Mon, 25 Aug 2008 15:08:59 +0000
parents	3ee59c43d784
children	2768bd7281e0

rev	line source
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1 /*
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	2 SDL - Simple DirectMedia Layer
1312 c9b51268668f Updated copyright information and removed rcs id lines (problematic in branch merges) Sam Lantinga <slouken@libsdl.org> parents: 1011 diff changeset	3 Copyright (C) 1997-2006 Sam Lantinga
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	4
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	5 This library is free software; you can redistribute it and/or
1312 c9b51268668f Updated copyright information and removed rcs id lines (problematic in branch merges) Sam Lantinga <slouken@libsdl.org> parents: 1011 diff changeset	6 modify it under the terms of the GNU Lesser General Public
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	7 License as published by the Free Software Foundation; either
1312 c9b51268668f Updated copyright information and removed rcs id lines (problematic in branch merges) Sam Lantinga <slouken@libsdl.org> parents: 1011 diff changeset	8 version 2.1 of the License, or (at your option) any later version.
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	9
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	10 This library is distributed in the hope that it will be useful,
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	11 but WITHOUT ANY WARRANTY; without even the implied warranty of
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
1312 c9b51268668f Updated copyright information and removed rcs id lines (problematic in branch merges) Sam Lantinga <slouken@libsdl.org> parents: 1011 diff changeset	13 Lesser General Public License for more details.
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	14
1312 c9b51268668f Updated copyright information and removed rcs id lines (problematic in branch merges) Sam Lantinga <slouken@libsdl.org> parents: 1011 diff changeset	15 You should have received a copy of the GNU Lesser General Public
c9b51268668f Updated copyright information and removed rcs id lines (problematic in branch merges) Sam Lantinga <slouken@libsdl.org> parents: 1011 diff changeset	16 License along with this library; if not, write to the Free Software
c9b51268668f Updated copyright information and removed rcs id lines (problematic in branch merges) Sam Lantinga <slouken@libsdl.org> parents: 1011 diff changeset	17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	18
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	19 Sam Lantinga
252 e8157fcb3114 Updated the source with the correct e-mail address Sam Lantinga <slouken@libsdl.org> parents: 0 diff changeset	20 slouken@libsdl.org
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	21 */
1402 d910939febfa Use consistent identifiers for the various platforms we support. Sam Lantinga <slouken@libsdl.org> parents: 1358 diff changeset	22 #include "SDL_config.h"
2716 f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	23 #include <math.h>
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	24
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	25 /* Functions for audio drivers to perform runtime conversion of audio format */
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	26
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	27 #include "SDL_audio.h"
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	28 #include "SDL_audio_c.h"
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	29
2716 f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	30 #define DEBUG_CONVERT
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	31
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	32 /* These are fractional multiplication routines. That is, their inputs
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	33 are two numbers in the range [-1, 1) and the result falls in that
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	34 same range. The output is the same size as the inputs, i.e.
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	35 32-bit x 32-bit = 32-bit.
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	36 */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	37
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	38 /* We hope here that the right shift includes sign extension */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	39 #ifdef SDL_HAS_64BIT_Type
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	40 #define SDL_FixMpy32(a, b) ((((Sint64)a * (Sint64)b) >> 31) & 0xffffffff)
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	41 #else
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	42 /* If we don't have the 64-bit type, do something more complicated. See http://www.8052.com/mul16.phtml or http://www.cs.uaf.edu/~cs301/notes/Chapter5/node5.html */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	43 #define SDL_FixMpy32(a, b) ((((Sint64)a * (Sint64)b) >> 31) & 0xffffffff)
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	44 #endif
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	45 #define SDL_FixMpy16(a, b) ((((Sint32)a * (Sint32)b) >> 14) & 0xffff)
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	46 #define SDL_FixMpy8(a, b) ((((Sint16)a * (Sint16)b) >> 7) & 0xff)
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	47 /* This macro just makes the floating point filtering code not have to be a special case. */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	48 #define SDL_FloatMpy(a, b) (a * b)
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	49
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	50 /* These macros take floating point numbers in the range [-1.0f, 1.0f) and
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	51 represent them as fixed-point numbers in that same range. There's no
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	52 checking that the floating point argument is inside the appropriate range.
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	53 */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	54
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	55 #define SDL_Make_1_7(a) (Sint8)(a * 128.0f)
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	56 #define SDL_Make_1_15(a) (Sint16)(a * 32768.0f)
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	57 #define SDL_Make_1_31(a) (Sint32)(a * 2147483648.0f)
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	58 #define SDL_Make_2_6(a) (Sint8)(a * 64.0f)
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	59 #define SDL_Make_2_14(a) (Sint16)(a * 16384.0f)
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	60 #define SDL_Make_2_30(a) (Sint32)(a * 1073741824.0f)
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	61
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	62 /* Effectively mix right and left channels into a single channel */
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	63 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	64 SDL_ConvertMono(SDL_AudioCVT * cvt, SDL_AudioFormat format)
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	65 {
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	66 int 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	67 Sint32 sample;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	68
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	69 #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	70 fprintf(stderr, "Converting to mono\n");
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	71 #endif
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	72 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	73 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	74 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	75 Uint8 src, dst;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	76
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	77 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	78 dst = 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	79 for (i = cvt->len_cvt / 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	80 sample = src[0] + src[1];
2042 3908e1f808e1 Fixed bug #292 Sam Lantinga <slouken@libsdl.org> parents: 2014 diff changeset	81 *dst = (Uint8) (sample / 2);
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	82 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	83 dst += 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	84 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	85 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	86 break;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	87
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	88 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	89 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	90 Sint8 src, dst;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	91
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	92 src = (Sint8 *) 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	93 dst = (Sint8 *) 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	94 for (i = cvt->len_cvt / 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	95 sample = src[0] + src[1];
2042 3908e1f808e1 Fixed bug #292 Sam Lantinga <slouken@libsdl.org> parents: 2014 diff changeset	96 *dst = (Sint8) (sample / 2);
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	97 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	98 dst += 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	99 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	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	101 break;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	102
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	103 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	104 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	105 Uint8 src, dst;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	106
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	107 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	108 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	109 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	110 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	111 sample = (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	112 (Uint16) ((src[2] << 8) \| src[3]);
2042 3908e1f808e1 Fixed bug #292 Sam Lantinga <slouken@libsdl.org> parents: 2014 diff changeset	113 sample /= 2;
3908e1f808e1 Fixed bug #292 Sam Lantinga <slouken@libsdl.org> parents: 2014 diff changeset	114 dst[1] = (sample & 0xFF);
3908e1f808e1 Fixed bug #292 Sam Lantinga <slouken@libsdl.org> parents: 2014 diff changeset	115 sample >>= 8;
3908e1f808e1 Fixed bug #292 Sam Lantinga <slouken@libsdl.org> parents: 2014 diff changeset	116 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	117 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	118 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	119 }
c121d94672cb SDL 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 } 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	121 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	122 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	123 (Uint16) ((src[3] << 8) \| src[2]);
2042 3908e1f808e1 Fixed bug #292 Sam Lantinga <slouken@libsdl.org> parents: 2014 diff changeset	124 sample /= 2;
3908e1f808e1 Fixed bug #292 Sam Lantinga <slouken@libsdl.org> parents: 2014 diff changeset	125 dst[0] = (sample & 0xFF);
3908e1f808e1 Fixed bug #292 Sam Lantinga <slouken@libsdl.org> parents: 2014 diff changeset	126 sample >>= 8;
3908e1f808e1 Fixed bug #292 Sam Lantinga <slouken@libsdl.org> parents: 2014 diff changeset	127 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	128 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	129 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	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 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	133 break;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	134
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	135 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	136 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	137 Uint8 src, dst;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	138
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	139 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	140 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	141 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	142 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	143 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	144 (Sint16) ((src[2] << 8) \| src[3]);
2042 3908e1f808e1 Fixed bug #292 Sam Lantinga <slouken@libsdl.org> parents: 2014 diff changeset	145 sample /= 2;
3908e1f808e1 Fixed bug #292 Sam Lantinga <slouken@libsdl.org> parents: 2014 diff changeset	146 dst[1] = (sample & 0xFF);
3908e1f808e1 Fixed bug #292 Sam Lantinga <slouken@libsdl.org> parents: 2014 diff changeset	147 sample >>= 8;
3908e1f808e1 Fixed bug #292 Sam Lantinga <slouken@libsdl.org> parents: 2014 diff changeset	148 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	149 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	150 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	151 }
c121d94672cb SDL 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 } 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	153 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	154 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	155 (Sint16) ((src[3] << 8) \| src[2]);
2042 3908e1f808e1 Fixed bug #292 Sam Lantinga <slouken@libsdl.org> parents: 2014 diff changeset	156 sample /= 2;
3908e1f808e1 Fixed bug #292 Sam Lantinga <slouken@libsdl.org> parents: 2014 diff changeset	157 dst[0] = (sample & 0xFF);
3908e1f808e1 Fixed bug #292 Sam Lantinga <slouken@libsdl.org> parents: 2014 diff changeset	158 sample >>= 8;
3908e1f808e1 Fixed bug #292 Sam Lantinga <slouken@libsdl.org> parents: 2014 diff changeset	159 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	160 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	161 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	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 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	165 break;
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	166
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	167 case AUDIO_S32:
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	168 {
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	169 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	170 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	171 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	172 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	173 const Sint64 added =
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	174 (((Sint64) (Sint32) SDL_SwapBE32(src[0])) +
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	175 ((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	176 *(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	177 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	178 } else {
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	179 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	180 const Sint64 added =
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	181 (((Sint64) (Sint32) SDL_SwapLE32(src[0])) +
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	182 ((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	183 *(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	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 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	187 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	188
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	189 case AUDIO_F32:
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	190 {
2014 7abe37467fa5 Replaced unions with calls to SDL_SwapFloat... Ryan C. Gordon <icculus@icculus.org> parents: 1985 diff changeset	191 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	192 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	193 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	194 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	195 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	196 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	197 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	198 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	199 *(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	200 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	201 } else {
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	202 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	203 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	204 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	205 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	206 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	207 *(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	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 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	211 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	212 }
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	213
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	214 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	215 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	216 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	217 }
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	218 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	219
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	220
942 41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	221 /* 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	222 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	223 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	224 {
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	225 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	226
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	227 #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	228 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	229 #endif
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	230
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	231 #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	232 { \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	233 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	234 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	235 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	236 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	237 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	238 src += 6; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	239 dst += 2; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	240 } \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	241 }
942 41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	242
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	243 /* 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	244 switch (SDL_AUDIO_BITSIZE(format)) {
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	245 case 8:
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	246 strip_chans_6_to_2(Uint8);
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	247 break;
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	248 case 16:
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	249 strip_chans_6_to_2(Uint16);
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	250 break;
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	251 case 32:
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	252 strip_chans_6_to_2(Uint32);
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	253 break;
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	254 }
942 41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	255
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	256 #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	257
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	258 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	259 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	260 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	261 }
942 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
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	265 /* 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	266 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	267 SDL_ConvertStrip_2(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	268 {
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	269 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	270
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	271 #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	272 fprintf(stderr, "Converting 6 down 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	273 #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	274
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	275 #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	276 { \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	277 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	278 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	279 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	280 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	281 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	282 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	283 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	284 src += 6; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	285 dst += 4; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	286 } \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	287 }
942 41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	288
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	289 /* 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	290 switch (SDL_AUDIO_BITSIZE(format)) {
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	291 case 8:
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	292 strip_chans_6_to_4(Uint8);
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	293 break;
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	294 case 16:
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	295 strip_chans_6_to_4(Uint16);
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	296 break;
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	297 case 32:
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	298 strip_chans_6_to_4(Uint32);
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	299 break;
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	300 }
942 41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	301
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	302 #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	303
1982 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 /= 6;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	305 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	306 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	307 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	308 }
942 41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	309 }
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	310
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	311 /* 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	312 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	313 SDL_ConvertStereo(SDL_AudioCVT * cvt, SDL_AudioFormat format)
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	314 {
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	315 int i;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	316
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	317 #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	318 fprintf(stderr, "Converting to stereo\n");
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	319 #endif
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	320
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	321 #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	322 { \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	323 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	324 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	325 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	326 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	327 dst -= 2; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	328 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	329 } \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	330 }
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	331
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	332 /* 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	333 switch (SDL_AUDIO_BITSIZE(format)) {
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	334 case 8:
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	335 dup_chans_1_to_2(Uint8);
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	336 break;
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	337 case 16:
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	338 dup_chans_1_to_2(Uint16);
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	339 break;
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	340 case 32:
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	341 dup_chans_1_to_2(Uint32);
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	342 break;
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	343 }
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	344
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	345 #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	346
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	347 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	348 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	349 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	350 }
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	351 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	352
942 41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	353
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	354 /* 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	355 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	356 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	357 {
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	358 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	359
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	360 #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	361 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	362 #endif
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	363
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	364 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	365 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	366 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	367 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	368
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	369 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	370 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	371 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	372 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	373 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	374 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	375 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	376 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	377 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	378 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	379 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	380 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	381 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	382 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	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 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	385 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	386
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	387 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	388 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	389 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	390
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	391 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	392 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	393 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	394 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	395 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	396 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	397 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	398 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	399 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	400 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	401 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	402 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	403 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	404 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	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 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	407 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	408
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	409 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	410 {
c121d94672cb SDL 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 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	412 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	413
c121d94672cb SDL 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 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	415 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	416
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	417 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	418 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	419 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	420 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	421 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	422 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	423 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	424 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	425 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	426 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	427 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	428 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	429 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	430
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	431 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	432 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	433 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	434 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	435
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	436 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	437 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	438 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	439 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	440 }
c121d94672cb SDL 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 } 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	442 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	443 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	444 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	445 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	446 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	447 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	448 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	449 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	450 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	451 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	452 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	453 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	454
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	455 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	456 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	457 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	458 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	459
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	460 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	461 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	462 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	463 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	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 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	467 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	468
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	469 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	470 {
c121d94672cb SDL 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 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	472 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	473
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	474 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	475 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	476
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	477 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	478 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	479 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	480 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	481 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	482 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	483 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	484 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	485 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	486 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	487 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	488 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	489 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	490
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	491 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	492 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	493 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	494 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	495
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	496 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	497 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	498 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	499 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	500 }
c121d94672cb SDL 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 } 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	502 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	503 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	504 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	505 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	506 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	507 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	508 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	509 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	510 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	511 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	512 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	513 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	514
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	515 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	516 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	517 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	518 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	519
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	520 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	521 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	522 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	523 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	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 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	527 break;
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	528
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	529 case AUDIO_S32:
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	530 {
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	531 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	532 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	533 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	534
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	535 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	536 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	537 dst -= 6;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	538 src -= 2;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	539 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	540 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	541 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	542 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	543 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	544 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	545 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	546 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	547 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	548 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	549 } else {
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	550 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	551 dst -= 6;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	552 src -= 2;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	553 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	554 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	555 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	556 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	557 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	558 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	559 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	560 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	561 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	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 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	565 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	566
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	567 case AUDIO_F32:
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	568 {
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	569 float lf, rf, ce;
2014 7abe37467fa5 Replaced unions with calls to SDL_SwapFloat... Ryan C. Gordon <icculus@icculus.org> parents: 1985 diff changeset	570 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	571 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	572
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	573 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	574 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	575 dst -= 6;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	576 src -= 2;
2014 7abe37467fa5 Replaced unions with calls to SDL_SwapFloat... Ryan C. Gordon <icculus@icculus.org> parents: 1985 diff changeset	577 lf = SDL_SwapFloatBE(src[0]);
7abe37467fa5 Replaced unions with calls to SDL_SwapFloat... Ryan C. Gordon <icculus@icculus.org> parents: 1985 diff changeset	578 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	579 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	580 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	581 dst[1] = src[1];
2014 7abe37467fa5 Replaced unions with calls to SDL_SwapFloat... Ryan C. Gordon <icculus@icculus.org> parents: 1985 diff changeset	582 dst[2] = SDL_SwapFloatBE(lf - ce);
7abe37467fa5 Replaced unions with calls to SDL_SwapFloat... Ryan C. Gordon <icculus@icculus.org> parents: 1985 diff changeset	583 dst[3] = SDL_SwapFloatBE(rf - ce);
7abe37467fa5 Replaced unions with calls to SDL_SwapFloat... Ryan C. Gordon <icculus@icculus.org> parents: 1985 diff changeset	584 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	585 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	586 } else {
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	587 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	588 dst -= 6;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	589 src -= 2;
2014 7abe37467fa5 Replaced unions with calls to SDL_SwapFloat... Ryan C. Gordon <icculus@icculus.org> parents: 1985 diff changeset	590 lf = SDL_SwapFloatLE(src[0]);
7abe37467fa5 Replaced unions with calls to SDL_SwapFloat... Ryan C. Gordon <icculus@icculus.org> parents: 1985 diff changeset	591 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	592 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	593 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	594 dst[1] = src[1];
2014 7abe37467fa5 Replaced unions with calls to SDL_SwapFloat... Ryan C. Gordon <icculus@icculus.org> parents: 1985 diff changeset	595 dst[2] = SDL_SwapFloatLE(lf - ce);
7abe37467fa5 Replaced unions with calls to SDL_SwapFloat... Ryan C. Gordon <icculus@icculus.org> parents: 1985 diff changeset	596 dst[3] = SDL_SwapFloatLE(rf - ce);
7abe37467fa5 Replaced unions with calls to SDL_SwapFloat... Ryan C. Gordon <icculus@icculus.org> parents: 1985 diff changeset	597 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	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 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	601 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	602
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	603 }
c121d94672cb SDL 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 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	605 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	606 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	607 }
942 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
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	611 /* 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	612 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	613 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	614 {
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	615 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	616
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	617 #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	618 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	619 #endif
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	620
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	621 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	622 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	623 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	624 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	625
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	626 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	627 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	628 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	629 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	630 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	631 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	632 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	633 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	634 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	635 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	636 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	637 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	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 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	640 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	641
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	642 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	643 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	644 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	645
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	646 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	647 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	648 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	649 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	650 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	651 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	652 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	653 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	654 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	655 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	656 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	657 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	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 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	660 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	661
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	662 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	663 {
c121d94672cb SDL 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 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	665 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	666
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	667 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	668 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	669
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	670 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	671 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	672 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	673 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	674 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	675 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	676 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	677 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	678 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	679 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	680 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	681 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	682 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	683
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	684 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	685 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	686 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	687 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	688 }
c121d94672cb SDL 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 } 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	690 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	691 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	692 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	693 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	694 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	695 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	696 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	697 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	698 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	699 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	700 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	701 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	702
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	703 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	704 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	705 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	706 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	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 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	710 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	711
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	712 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	713 {
c121d94672cb SDL 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 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	715 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	716
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	717 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	718 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	719
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	720 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	721 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	722 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	723 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	724 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	725 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	726 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	727 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	728 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	729 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	730 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	731 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	732 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	733
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	734 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	735 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	736 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	737 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	738 }
c121d94672cb SDL 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 } 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	740 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	741 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	742 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	743 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	744 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	745 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	746 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	747 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	748 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	749 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	750 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	751 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	752
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	753 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	754 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	755 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	756 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	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 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	760 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	761
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	762 case AUDIO_S32:
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	763 {
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	764 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	765 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	766 Sint32 lf, rf, ce;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	767
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	768 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	769 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	770 dst -= 4;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	771 src -= 2;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	772 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	773 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	774 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	775 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	776 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	777 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	778 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	779 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	780 } else {
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	781 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	782 dst -= 4;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	783 src -= 2;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	784 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	785 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	786 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	787 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	788 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	789 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	790 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	791 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	792 }
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	793 }
c121d94672cb SDL 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 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	795 }
c121d94672cb SDL 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 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	797 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	798 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	799 }
942 41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	800 }
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	801
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	802 /* 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	803 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	804 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	805 {
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	806 int i;
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	807
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	808 #ifdef DEBUG_CONVERT
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	809 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	810 #endif
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	811
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	812 #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	813 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	814 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	815 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	816 src--; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	817 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	818 dst -= 2; \
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
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	822 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	823 case 8:
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	824 mul2_mono(Uint8);
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	825 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	826 case 16:
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	827 mul2_mono(Uint16);
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	828 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	829 case 32:
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	830 mul2_mono(Uint32);
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	831 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	832 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	833
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	834 #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	835
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	836 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	837 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	838 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	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
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	843 /* 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	844 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	845 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	846 {
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	847 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	848
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	849 #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	850 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	851 #endif
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	852
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	853 #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	854 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	855 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	856 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	857 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	858 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	859 src -= 2; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	860 dst[-1] = r; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	861 dst[-2] = l; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	862 dst[-3] = r; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	863 dst[-4] = l; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	864 dst -= 4; \
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
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	868 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	869 case 8:
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	870 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	871 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	872 case 16:
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	873 mul2_stereo(Uint16);
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	874 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	875 case 32:
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	876 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	877 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	878 }
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	879
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	880 #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	881
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	882 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	883 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	884 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	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
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	888 /* 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	889 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	890 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	891 {
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	892 int i;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	893
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	894 #ifdef DEBUG_CONVERT
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	895 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	896 #endif
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	897
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	898 #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	899 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	900 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	901 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	902 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	903 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	904 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	905 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	906 src -= 4; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	907 dst[-1] = c1; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	908 dst[-2] = c2; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	909 dst[-3] = c3; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	910 dst[-4] = c4; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	911 dst[-5] = c1; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	912 dst[-6] = c2; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	913 dst[-7] = c3; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	914 dst[-8] = c4; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	915 dst -= 8; \
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
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	919 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	920 case 8:
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	921 mul2_quad(Uint8);
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	922 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	923 case 16:
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	924 mul2_quad(Uint16);
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	925 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	926 case 32:
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	927 mul2_quad(Uint32);
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	928 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	929 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	930
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	931 #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	932
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	933 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	934 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	935 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	936 }
942 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
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	940 /* 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	941 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	942 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	943 {
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	944 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	945
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	946 #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	947 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	948 #endif
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	949
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	950 #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	951 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	952 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	953 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	954 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	955 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	956 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	957 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	958 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	959 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	960 src -= 6; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	961 dst[-1] = c1; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	962 dst[-2] = c2; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	963 dst[-3] = c3; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	964 dst[-4] = c4; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	965 dst[-5] = c5; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	966 dst[-6] = c6; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	967 dst[-7] = c1; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	968 dst[-8] = c2; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	969 dst[-9] = c3; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	970 dst[-10] = c4; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	971 dst[-11] = c5; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	972 dst[-12] = c6; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	973 dst -= 12; \
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
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	977 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	978 case 8:
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	979 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	980 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	981 case 16:
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	982 mul2_chansix(Uint16);
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	983 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	984 case 32:
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	985 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	986 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	987 }
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	988
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	989 #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	990
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	991 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	992 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	993 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	994 }
942 41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	995 }
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	996
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	997 /* 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	998 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	999 SDL_RateDIV2(SDL_AudioCVT * cvt, SDL_AudioFormat format)
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1000 {
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	1001 int i;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1002
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1003 #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	1004 fprintf(stderr, "Converting audio rate / 2 (mono)\n");
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1005 #endif
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1006
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	1007 #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	1008 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	1009 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	1010 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	1011 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	1012 src += 2; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1013 dst++; \
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
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1017 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	1018 case 8:
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1019 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	1020 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	1021 case 16:
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1022 div2_mono(Uint16);
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1023 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1024 case 32:
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1025 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	1026 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	1027 }
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1028
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	1029 #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	1030
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	1031 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	1032 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	1033 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	1034 }
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1035 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1036
942 41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	1037
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	1038 /* 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	1039 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1040 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	1041 {
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	1042 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	1043
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	1044 #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	1045 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	1046 #endif
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1047
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	1048 #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	1049 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	1050 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	1051 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	1052 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	1053 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	1054 src += 4; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1055 dst += 2; \
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
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1059 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	1060 case 8:
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1061 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	1062 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	1063 case 16:
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1064 div2_stereo(Uint16);
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1065 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1066 case 32:
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1067 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	1068 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	1069 }
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1070
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	1071 #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	1072
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	1073 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	1074 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	1075 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	1076 }
942 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
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	1080 /* 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	1081 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1082 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	1083 {
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	1084 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	1085
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	1086 #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	1087 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	1088 #endif
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1089
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	1090 #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	1091 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	1092 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	1093 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	1094 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	1095 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	1096 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	1097 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	1098 src += 8; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1099 dst += 4; \
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
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1103 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	1104 case 8:
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1105 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	1106 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	1107 case 16:
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1108 div2_quad(Uint16);
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1109 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1110 case 32:
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1111 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	1112 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	1113 }
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1114
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	1115 #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	1116
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	1117 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	1118 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	1119 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	1120 }
942 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
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	1123 /* 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	1124 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1125 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	1126 {
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	1127 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	1128
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	1129 #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	1130 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	1131 #endif
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1132
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	1133 #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	1134 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	1135 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	1136 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	1137 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	1138 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	1139 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	1140 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	1141 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	1142 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	1143 src += 12; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1144 dst += 6; \
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
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1148 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	1149 case 8:
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1150 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	1151 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	1152 case 16:
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1153 div2_chansix(Uint16);
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1154 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1155 case 32:
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1156 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	1157 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	1158 }
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1159
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	1160 #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	1161
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	1162 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	1163 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	1164 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	1165 }
942 41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	1166 }
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	1167
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1168 /* 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	1169 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1170 SDL_RateSLOW(SDL_AudioCVT * cvt, SDL_AudioFormat format)
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1171 {
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	1172 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	1173 int i, clen;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1174
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1175 #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	1176 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	1177 #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	1178 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	1179 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	1180 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	1181 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	1182 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1183 Uint8 *output;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1184
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	1185 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	1186 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	1187 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	1188 *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	1189 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	1190 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	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 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1193 break;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1194
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	1195 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	1196 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1197 Uint16 *output;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1198
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	1199 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	1200 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	1201 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	1202 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	1203 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	1204 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	1205 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	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 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1208 break;
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1209
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1210 case 32:
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1211 {
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1212 /* !!! 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	1213 #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	1214 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	1215 #endif
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1216 }
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	1217 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1218 } else {
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1219 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	1220 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	1221 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1222 Uint8 *output;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1223
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	1224 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	1225 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	1226 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	1227 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	1228 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	1229 *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	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 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1232 break;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1233
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	1234 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	1235 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1236 Uint16 *output;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1237
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	1238 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	1239 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	1240 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	1241 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	1242 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	1243 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	1244 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	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 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1247 break;
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1248
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1249 case 32:
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1250 {
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1251 /* !!! 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	1252 #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	1253 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	1254 #endif
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1255 }
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	1256 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1257 }
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1258
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	1259 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	1260 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	1261 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	1262 }
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1263 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1264
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	1265 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	1266 SDL_ConvertAudio(SDL_AudioCVT * cvt)
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1267 {
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	1268 /* 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	1269 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	1270 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	1271 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	1272 }
c121d94672cb SDL 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 /* 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	1274 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	1275 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	1276 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	1277 }
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1278
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	1279 /* 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	1280 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	1281 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	1282 return (0);
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1283 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1284
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1285
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1286 static SDL_AudioFilter
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1287 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	1288 {
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1289 /*
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1290 * 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	1291 * 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	1292 */
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1293
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	1294 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	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 /*
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1299 * 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	1300 * 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	1301 * 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	1302 * specific data types.
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1303 */
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1304 static int
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1305 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	1306 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	1307 {
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1308 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	1309 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	1310 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	1311 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	1312
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1313 /* 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	1314 if (filter == NULL) {
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1315 int i;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1316 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	1317 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	1318 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	1319 filter = filt->filter;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1320 break;
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
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1324 if (filter == NULL) {
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	1325 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	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
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1329 /* 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	1330 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	1331 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	1332 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	1333 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	1334 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	1335 } 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	1336 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	1337 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1338
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	1339 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	1340 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1341
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	1342 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	1343 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1344
2716 f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1345 /* Generate the necessary IIR lowpass coefficients for resampling.
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1346 Assume that the SDL_AudioCVT struct is already set up with
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1347 the correct values for len_mult and len_div, and use the
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1348 type of dst_format. Also assume the buffer is allocated.
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1349 Note the buffer needs to be 6 units long.
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1350 For now, use RBJ's cookbook coefficients. It might be more
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1351 optimal to create a Butterworth filter, but this is more difficult.
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1352 */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1353 int
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1354 SDL_BuildIIRLowpass(SDL_AudioCVT * cvt, SDL_AudioFormat format)
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1355 {
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1356 float fc; /* cutoff frequency */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1357 float coeff[6]; /* floating point iir coefficients b0, b1, b2, a0, a1, a2 */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1358 float scale;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1359 float w0, alpha, cosw0;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1360 int i;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1361
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1362 /* The higher Q is, the higher CUTOFF can be. Need to find a good balance to avoid aliasing */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1363 static const float Q = 5.0f;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1364 static const float CUTOFF = 0.4f;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1365
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1366 fc = (cvt->len_mult >
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1367 cvt->len_div) ? CUTOFF / (float) cvt->len_mult : CUTOFF /
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1368 (float) cvt->len_div;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1369
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1370 w0 = 2.0f * M_PI * fc;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1371 cosw0 = cosf(w0);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1372 alpha = sin(w0) / (2.0f * Q);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1373
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1374 /* Compute coefficients, normalizing by a0 */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1375 scale = 1.0f / (1.0f + alpha);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1376
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1377 coeff[0] = (1.0f - cosw0) / 2.0f * scale;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1378 coeff[1] = (1.0f - cosw0) * scale;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1379 coeff[2] = coeff[0];
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1380
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1381 coeff[3] = 1.0f; /* a0 is normalized to 1 */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1382 coeff[4] = -2.0f * cosw0 * scale;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1383 coeff[5] = (1.0f - alpha) * scale;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1384
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1385 /* Copy the coefficients to the struct. If necessary, convert coefficients to fixed point, using the range (-2.0, 2.0) */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1386 #define convert_fixed(type, fix) { \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1387 type cvt_coeff = (type )cvt->coeff; \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1388 for(i = 0; i < 6; ++i) { \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1389 cvt_coeff[i] = fix(coeff[i]); \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1390 } \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1391 }
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1392
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1393 if (SDL_AUDIO_ISFLOAT(format) && SDL_AUDIO_BITSIZE(format) == 32) {
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1394 float cvt_coeff = (float ) cvt->coeff;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1395 for (i = 0; i < 6; ++i) {
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1396 cvt_coeff[i] = coeff[i];
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1397 }
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1398 } else {
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1399 switch (SDL_AUDIO_BITSIZE(format)) {
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1400 case 8:
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1401 convert_fixed(Uint8, SDL_Make_2_6);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1402 break;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1403 case 16:
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1404 convert_fixed(Uint16, SDL_Make_2_14);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1405 break;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1406 case 32:
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1407 convert_fixed(Uint32, SDL_Make_2_30);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1408 break;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1409 }
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1410 }
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1411
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1412 #ifdef DEBUG_CONVERT
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1413 #define debug_iir(type) { \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1414 type cvt_coeff = (type )cvt->coeff; \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1415 for(i = 0; i < 6; ++i) { \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1416 printf("coeff[%u] = %f = 0x%x\n", i, coeff[i], cvt_coeff[i]); \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1417 } \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1418 }
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1419 if (SDL_AUDIO_ISFLOAT(format) && SDL_AUDIO_BITSIZE(format) == 32) {
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1420 float cvt_coeff = (float ) cvt->coeff;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1421 for (i = 0; i < 6; ++i) {
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1422 printf("coeff[%u] = %f = %f\n", i, coeff[i], cvt_coeff[i]);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1423 }
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1424 } else {
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1425 switch (SDL_AUDIO_BITSIZE(format)) {
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1426 case 8:
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1427 debug_iir(Uint8);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1428 break;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1429 case 16:
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1430 debug_iir(Uint16);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1431 break;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1432 case 32:
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1433 debug_iir(Uint32);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1434 break;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1435 }
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1436 }
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1437 #undef debug_iir
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1438 #endif
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1439
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1440 /* Initialize the state buffer to all zeroes, and set initial position */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1441 memset(cvt->state_buf, 0, 4 * SDL_AUDIO_BITSIZE(format) / 4);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1442 cvt->state_pos = 0;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1443 #undef convert_fixed
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1444 }
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1445
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1446 /* Apply the lowpass IIR filter to the given SDL_AudioCVT struct */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1447 /* This was implemented because it would be much faster than the fir filter,
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1448 but it doesn't seem to have a steep enough cutoff so we'd need several
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1449 cascaded biquads, which probably isn't a great idea. Therefore, this
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1450 function can probably be discarded.
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1451 */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1452 static void
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1453 SDL_FilterIIR(SDL_AudioCVT * cvt, SDL_AudioFormat format)
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1454 {
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1455 Uint32 i, n;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1456
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1457 /* TODO: Check that n is calculated right */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1458 n = 8 * cvt->len_cvt / SDL_AUDIO_BITSIZE(format);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1459
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1460 /* Note that the coefficients are 2_x and the input is 1_x. Do we need to shift left at the end here? The right shift temp = buf[n] >> 1 needs to depend on whether the type is signed or not for sign extension. */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1461 /* cvt->state_pos = 1: state[0] = x_n-1, state[1] = x_n-2, state[2] = y_n-1, state[3] - y_n-2 */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1462 #define iir_fix(type, mult) {\
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1463 type coeff = (type )cvt->coeff; \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1464 type state = (type )cvt->state_buf; \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1465 type buf = (type )cvt->buf; \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1466 type temp; \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1467 for(i = 0; i < n; ++i) { \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1468 temp = buf[i] >> 1; \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1469 if(cvt->state_pos) { \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1470 buf[i] = mult(coeff[0], temp) + mult(coeff[1], state[0]) + mult(coeff[2], state[1]) - mult(coeff[4], state[2]) - mult(coeff[5], state[3]); \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1471 state[1] = temp; \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1472 state[3] = buf[i]; \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1473 cvt->state_pos = 0; \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1474 } else { \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1475 buf[i] = mult(coeff[0], temp) + mult(coeff[1], state[1]) + mult(coeff[2], state[0]) - mult(coeff[4], state[3]) - mult(coeff[5], state[2]); \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1476 state[0] = temp; \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1477 state[2] = buf[i]; \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1478 cvt->state_pos = 1; \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1479 } \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1480 } \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1481 }
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1482 /* Need to test to see if the previous method or this one is faster */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1483 /*#define iir_fix(type, mult) {\
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1484 type coeff = (type )cvt->coeff; \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1485 type state = (type )cvt->state_buf; \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1486 type buf = (type )cvt->buf; \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1487 type temp; \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1488 for(i = 0; i < n; ++i) { \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1489 temp = buf[i] >> 1; \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1490 buf[i] = mult(coeff[0], temp) + mult(coeff[1], state[0]) + mult(coeff[2], state[1]) - mult(coeff[4], state[2]) - mult(coeff[5], state[3]); \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1491 state[1] = state[0]; \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1492 state[0] = temp; \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1493 state[3] = state[2]; \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1494 state[2] = buf[i]; \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1495 } \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1496 }*/
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1497
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1498 if (SDL_AUDIO_ISFLOAT(format) && SDL_AUDIO_BITSIZE(format) == 32) {
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1499 float coeff = (float ) cvt->coeff;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1500 float state = (float ) cvt->state_buf;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1501 float buf = (float ) cvt->buf;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1502 float temp;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1503
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1504 for (i = 0; i < n; ++i) {
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1505 /* y[n] = b0 * x[n] + b1 * x[n-1] + b2 * x[n-2] - a1 * y[n-1] - a[2] * y[n-2] */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1506 temp = buf[i];
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1507 if (cvt->state_pos) {
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1508 buf[i] =
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1509 coeff[0] * buf[n] + coeff[1] * state[0] +
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1510 coeff[2] * state[1] - coeff[4] * state[2] -
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1511 coeff[5] * state[3];
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1512 state[1] = temp;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1513 state[3] = buf[i];
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1514 cvt->state_pos = 0;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1515 } else {
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1516 buf[i] =
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1517 coeff[0] * buf[n] + coeff[1] * state[1] +
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1518 coeff[2] * state[0] - coeff[4] * state[3] -
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1519 coeff[5] * state[2];
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1520 state[0] = temp;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1521 state[2] = buf[i];
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1522 cvt->state_pos = 1;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1523 }
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1524 }
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1525 } else {
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1526 /* Treat everything as signed! */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1527 switch (SDL_AUDIO_BITSIZE(format)) {
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1528 case 8:
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1529 iir_fix(Sint8, SDL_FixMpy8);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1530 break;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1531 case 16:
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1532 iir_fix(Sint16, SDL_FixMpy16);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1533 break;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1534 case 32:
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1535 iir_fix(Sint32, SDL_FixMpy32);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1536 break;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1537 }
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1538 }
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1539 #undef iir_fix
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1540 }
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1541
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1542 /* Apply the windowed sinc FIR filter to the given SDL_AudioCVT struct.
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1543 */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1544 static void
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1545 SDL_FilterFIR(SDL_AudioCVT * cvt, SDL_AudioFormat format)
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1546 {
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1547 int n = 8 * cvt->len_cvt / SDL_AUDIO_BITSIZE(format);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1548 int m = cvt->len_sinc;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1549 int i, j;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1550
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1551 /*
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1552 Note: We can make a big optimization here by taking advantage
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1553 of the fact that the signal is zero stuffed, so we can do
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1554 significantly fewer multiplications and additions. However, this
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1555 depends on the zero stuffing ratio, so it may not pay off. This would
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1556 basically be a polyphase filter.
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1557 */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1558 /* One other way to do this fast is to look at the fir filter from a different angle:
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1559 After we zero stuff, we have input of all zeroes, except for every len_mult
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1560 sample. If we choose a sinc length equal to len_mult, then the fir filter becomes
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1561 much more simple: we're just taking a windowed sinc, shifting it to start at each
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1562 len_mult sample, and scaling it by the value of that sample. If we do this, then
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1563 we don't even need to worry about the sample histories, and the inner loop here is
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1564 unnecessary. This probably sacrifices some quality but could really speed things up as well.
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1565 */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1566 /* We only calculate the values of samples which are 0 (mod len_div) because
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1567 those are the only ones used. All the other ones are discarded in the
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1568 third step of resampling. This is a huge speedup. As a warning, though,
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1569 if for some reason this is used elsewhere where there are no samples discarded,
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1570 the output will not be corrrect if len_div is not 1. To make this filter a
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1571 generic FIR filter, simply remove the if statement "if(i % cvt->len_div == 0)"
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1572 around the inner loop so that every sample is processed.
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1573 */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1574 /* This is basically just a FIR filter. i.e. for input x_n and m coefficients,
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1575 y_n = x_nsinc_0 + x_(n-1)sinc_1 + x_(n-2)sinc_2 + ... + x_(n-m+1)sinc_(m-1)
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1576 */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1577 #define filter_sinc(type, mult) { \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1578 type sinc = (type )cvt->coeff; \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1579 type state = (type )cvt->state_buf; \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1580 type buf = (type )cvt->buf; \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1581 for(i = 0; i < n; ++i) { \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1582 state[cvt->state_pos] = buf[i]; \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1583 buf[i] = 0; \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1584 if( i % cvt->len_div == 0 ) { \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1585 for(j = 0; j < m; ++j) { \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1586 buf[i] += mult(sinc[j], state[(cvt->state_pos + j) % m]); \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1587 } \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1588 }\
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1589 cvt->state_pos = (cvt->state_pos + 1) % m; \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1590 } \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1591 }
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1592
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1593 if (SDL_AUDIO_ISFLOAT(format) && SDL_AUDIO_BITSIZE(format) == 32) {
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1594 filter_sinc(float, SDL_FloatMpy);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1595 } else {
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1596 switch (SDL_AUDIO_BITSIZE(format)) {
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1597 case 8:
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1598 filter_sinc(Sint8, SDL_FixMpy8);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1599 break;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1600 case 16:
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1601 filter_sinc(Sint16, SDL_FixMpy16);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1602 break;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1603 case 32:
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1604 filter_sinc(Sint32, SDL_FixMpy32);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1605 break;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1606 }
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1607 }
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1608
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1609 #undef filter_sinc
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1610
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1611 }
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1612
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1613 /* Generate the necessary windowed sinc filter for resampling.
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1614 Assume that the SDL_AudioCVT struct is already set up with
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1615 the correct values for len_mult and len_div, and use the
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1616 type of dst_format. Also assume the buffer is allocated.
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1617 Note the buffer needs to be m+1 units long.
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1618 */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1619 int
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1620 SDL_BuildWindowedSinc(SDL_AudioCVT * cvt, SDL_AudioFormat format,
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1621 unsigned int m)
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1622 {
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1623 float fScale; /* scale factor for fixed point */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1624 float fSinc; / floating point sinc buffer, to be converted to fixed point */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1625 float fc; /* cutoff frequency */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1626 float two_pi_fc, two_pi_over_m, four_pi_over_m, m_over_two;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1627 float norm_sum, norm_fact;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1628 unsigned int i;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1629
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1630 /* Check that the buffer is allocated */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1631 if (cvt->coeff == NULL) {
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1632 return -1;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1633 }
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1634
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1635 /* Set the length */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1636 cvt->len_sinc = m + 1;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1637
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1638 /* Allocate the floating point windowed sinc. */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1639 fSinc = (float ) malloc((m + 1) sizeof(float));
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1640 if (fSinc == NULL) {
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1641 return -1;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1642 }
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1643
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1644 /* Set up the filter parameters */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1645 fc = (cvt->len_mult >
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1646 cvt->len_div) ? 0.5f / (float) cvt->len_mult : 0.5f /
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1647 (float) cvt->len_div;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1648 #ifdef DEBUG_CONVERT
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1649 printf("Lowpass cutoff frequency = %f\n", fc);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1650 #endif
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1651 two_pi_fc = 2.0f * M_PI * fc;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1652 two_pi_over_m = 2.0f * M_PI / (float) m;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1653 four_pi_over_m = 2.0f * two_pi_over_m;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1654 m_over_two = (float) m / 2.0f;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1655 norm_sum = 0.0f;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1656
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1657 for (i = 0; i <= m; ++i) {
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1658 if (i == m / 2) {
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1659 fSinc[i] = two_pi_fc;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1660 } else {
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1661 fSinc[i] =
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1662 sinf(two_pi_fc * ((float) i - m_over_two)) / ((float) i -
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1663 m_over_two);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1664 /* Apply blackman window */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1665 fSinc[i] *=
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1666 0.42f - 0.5f * cosf(two_pi_over_m * (float) i) +
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1667 0.08f * cosf(four_pi_over_m * (float) i);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1668 }
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1669 norm_sum += fabs(fSinc[i]);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1670 }
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1671
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1672 norm_fact = 1.0f / norm_sum;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1673
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1674 #define convert_fixed(type, fix) { \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1675 type dst = (type )cvt->coeff; \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1676 for( i = 0; i <= m; ++i ) { \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1677 dst[i] = fix(fSinc[i] * norm_fact); \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1678 } \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1679 }
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1680
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1681 /* If we're using floating point, we only need to normalize */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1682 if (SDL_AUDIO_ISFLOAT(format) && SDL_AUDIO_BITSIZE(format) == 32) {
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1683 float fDest = (float ) cvt->coeff;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1684 for (i = 0; i <= m; ++i) {
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1685 fDest[i] = fSinc[i] * norm_fact;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1686 }
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1687 } else {
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1688 switch (SDL_AUDIO_BITSIZE(format)) {
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1689 case 8:
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1690 convert_fixed(Uint8, SDL_Make_1_7);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1691 break;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1692 case 16:
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1693 convert_fixed(Uint16, SDL_Make_1_15);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1694 break;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1695 case 32:
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1696 convert_fixed(Uint32, SDL_Make_1_31);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1697 break;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1698 }
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1699 }
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1700
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1701 /* Initialize the state buffer to all zeroes, and set initial position */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1702 memset(cvt->state_buf, 0, cvt->len_sinc * SDL_AUDIO_BITSIZE(format) / 4);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1703 cvt->state_pos = 0;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1704
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1705 /* Clean up */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1706 #undef convert_fixed
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1707 free(fSinc);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1708 }
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1709
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1710 /* This is used to reduce the resampling ratio */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1711 inline int
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1712 SDL_GCD(int a, int b)
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1713 {
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1714 int temp;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1715 while (b != 0) {
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1716 temp = a % b;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1717 a = b;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1718 b = temp;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1719 }
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1720 return a;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1721 }
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1722
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1723 /* Perform proper resampling. This is pretty slow but it's the best-sounding method. */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1724 static void SDLCALL
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1725 SDL_Resample(SDL_AudioCVT * cvt, SDL_AudioFormat format)
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1726 {
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1727 int i, j;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1728
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1729 #ifdef DEBUG_CONVERT
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1730 printf("Converting audio rate via proper resampling (mono)\n");
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1731 #endif
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1732
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1733 #define zerostuff_mono(type) { \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1734 const type src = (const type ) (cvt->buf + cvt->len_cvt); \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1735 type dst = (type ) (cvt->buf + (cvt->len_cvt * cvt->len_mult)); \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1736 for (i = cvt->len_cvt / sizeof (type); i; --i) { \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1737 src--; \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1738 dst[-1] = src[0]; \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1739 for( j = -cvt->len_mult; j < -1; ++j ) { \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1740 dst[j] = 0; \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1741 } \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1742 dst -= cvt->len_mult; \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1743 } \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1744 }
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1745
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1746 #define discard_mono(type) { \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1747 const type src = (const type ) (cvt->buf); \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1748 type dst = (type ) (cvt->buf); \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1749 for (i = 0; i < (cvt->len_cvt / sizeof(type)) / cvt->len_div; ++i) { \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1750 dst[0] = src[0]; \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1751 src += cvt->len_div; \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1752 ++dst; \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1753 } \
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1754 }
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1755
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1756 /* Step 1: Zero stuff the conversion buffer. This upsamples by a factor of len_mult,
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1757 creating aliasing at frequencies above the original nyquist frequency.
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1758 */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1759 #ifdef DEBUG_CONVERT
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1760 printf("Zero-stuffing by a factor of %u\n", cvt->len_mult);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1761 #endif
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1762 switch (SDL_AUDIO_BITSIZE(format)) {
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1763 case 8:
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1764 zerostuff_mono(Uint8);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1765 break;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1766 case 16:
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1767 zerostuff_mono(Uint16);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1768 break;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1769 case 32:
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1770 zerostuff_mono(Uint32);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1771 break;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1772 }
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1773
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1774 cvt->len_cvt *= cvt->len_mult;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1775
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1776 /* Step 2: Use a windowed sinc FIR filter (lowpass filter) to remove the alias
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1777 frequencies. This is the slow part.
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1778 */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1779 SDL_FilterFIR(cvt, format);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1780
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1781 /* Step 3: Now downsample by discarding samples. */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1782
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1783 #ifdef DEBUG_CONVERT
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1784 printf("Discarding samples by a factor of %u\n", cvt->len_div);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1785 #endif
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1786 switch (SDL_AUDIO_BITSIZE(format)) {
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1787 case 8:
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1788 discard_mono(Uint8);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1789 break;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1790 case 16:
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1791 discard_mono(Uint16);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1792 break;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1793 case 32:
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1794 discard_mono(Uint32);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1795 break;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1796 }
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1797
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1798 #undef zerostuff_mono
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1799 #undef discard_mono
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1800
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1801 cvt->len_cvt /= cvt->len_div;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1802
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1803 if (cvt->filters[++cvt->filter_index]) {
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1804 cvt->filters[cvt->filter_index] (cvt, format);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1805 }
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1806 }
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1807
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1808
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1809 /* 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	1810 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	1811 no conversion needed, or 1 if the audio filter is set up.
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1812 */
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	1813
c121d94672cb SDL 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 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	1815 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	1816 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	1817 SDL_AudioFormat dst_fmt, Uint8 dst_channels, int dst_rate)
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1818 {
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1819 /* 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	1820 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	1821 return -1;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1822 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1823 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	1824 return -1;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1825 }
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	1826 #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	1827 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	1828 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	1829 #endif
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1830
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	1831 /* 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	1832
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1833 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	1834 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	1835 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	1836 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	1837 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	1838 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	1839 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	1840
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1841 /* 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	1842 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	1843 return -1; /* shouldn't happen, but just in case... */
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1844
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1845 /* 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	1846 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	1847 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	1848 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	1849 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	1850 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	1851 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	1852 }
c121d94672cb SDL 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 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	1854 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	1855 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	1856 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	1857 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	1858 }
c121d94672cb SDL 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 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	1860 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	1861 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	1862 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	1863 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	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 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	1866 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	1867 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	1868 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	1869 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	1870 }
c121d94672cb SDL 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 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	1872 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	1873 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	1874 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	1875 }
c121d94672cb SDL 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 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	1877 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	1878 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	1879 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	1880 }
c121d94672cb SDL 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 /* 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	1882 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	1883 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	1884 */
c121d94672cb SDL 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 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	1886 ((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	1887 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	1888 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	1889 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	1890 }
c121d94672cb SDL 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 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	1892 /* 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	1893 }
c121d94672cb SDL 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 }
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: 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 /* Do rate conversion */
2716 f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1897 if (src_rate != dst_rate) {
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1898 int rate_gcd;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1899 rate_gcd = SDL_GCD(src_rate, dst_rate);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1900 cvt->len_mult = dst_rate / rate_gcd;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1901 cvt->len_div = src_rate / rate_gcd;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1902 cvt->len_ratio = (double) cvt->len_mult / (double) cvt->len_div;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1903 cvt->filters[cvt->filter_index++] = SDL_Resample;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1904 SDL_BuildWindowedSinc(cvt, dst_fmt, 768);
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1905 }
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1906
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1907 /*
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	1908 cvt->rate_incr = 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	1909 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	1910 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	1911 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	1912 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	1913 SDL_AudioFilter rate_cvt = NULL;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1914
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	1915 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	1916 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	1917 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	1918 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	1919 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	1920 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	1921 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	1922 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	1923 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	1924 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	1925 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	1926 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	1927 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	1928 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	1929 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	1930 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	1931 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	1932 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	1933 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1934 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	1935 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	1936 } 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	1937 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	1938 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	1939 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	1940 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	1941 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	1942 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	1943 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	1944 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	1945 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	1946 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	1947 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	1948 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	1949 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	1950 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	1951 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	1952 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	1953 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	1954 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1955 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	1956 len_ratio = 2.0;
2716 f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1957 }*/
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1958 /* If hi_rate = lo_rate2^x then conversion is easy /
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1959 /* while (((lo_rate * 2) / 100) <= (hi_rate / 100)) {
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1960 cvt->filters[cvt->filter_index++] = rate_cvt;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1961 cvt->len_mult *= len_mult;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1962 lo_rate *= 2;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1963 cvt->len_ratio *= len_ratio;
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1964 } */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1965 /* We may need a slow conversion here to finish up */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1966 /* if ((lo_rate / 100) != (hi_rate / 100)) {
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1967 #if 1 */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1968 /* The problem with this is that if the input buffer is
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1969 say 1K, and the conversion rate is say 1.1, then the
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1970 output buffer is 1.1K, which may not be an acceptable
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1971 buffer size for the audio driver (not a power of 2)
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1972 */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1973 /* For now, punt and hope the rate distortion isn't great.
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1974 */
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1975 /*#else
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	1976 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	1977 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	1978 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	1979 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	1980 } 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	1981 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	1982 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	1983 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1984 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	1985 #endif
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1986 }
2716 f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	1987 }*/
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1988
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	1989 /* 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	1990 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	1991 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	1992 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	1993 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	1994 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	1995 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	1996 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	1997 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1998 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	1999 }
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	2000
2716 f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	2001 #undef SDL_FixMpy8
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	2002 #undef SDL_FixMpy16
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	2003 #undef SDL_FixMpy32
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	2004 #undef SDL_FloatMpy
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	2005 #undef SDL_Make_1_7
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	2006 #undef SDL_Make_1_15
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	2007 #undef SDL_Make_1_31
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	2008 #undef SDL_Make_2_6
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	2009 #undef SDL_Make_2_14
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	2010 #undef SDL_Make_2_30
f8f68f47285a Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: 2130 diff changeset	2011
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	2012 /* vi: set ts=4 sw=4 expandtab: */

Mercurial > sdl-ios-xcode

annotate src/audio/SDL_audiocvt.c @ 2716:f8f68f47285a