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

annotate src/audio/SDL_audiocvt.c @ 2656:dd74182b3c3c gsoc2008_audio_resampling

Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.

author	Aaron Wishnick <schnarf@gmail.com>
date	Wed, 18 Jun 2008 18:55:50 +0000
parents	b8e736c8a5a8
children	29306e52dab8

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"
2655 b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> 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
2656 dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	30 #define DEBUG_CONVERT
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	31
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	32 /* 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	33 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	34 SDL_ConvertMono(SDL_AudioCVT * cvt, SDL_AudioFormat format)
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	35 {
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	36 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	37 Sint32 sample;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	38
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	39 #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	40 fprintf(stderr, "Converting to mono\n");
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	41 #endif
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	42 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	43 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	44 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	45 Uint8 src, dst;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	46
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	47 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	48 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	49 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	50 sample = src[0] + src[1];
2042 3908e1f808e1 Fixed bug #292 Sam Lantinga <slouken@libsdl.org> parents: 2014 diff changeset	51 *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	52 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	53 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	54 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	55 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	56 break;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	57
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	58 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	59 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	60 Sint8 src, dst;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	61
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	62 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	63 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	64 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	65 sample = src[0] + src[1];
2042 3908e1f808e1 Fixed bug #292 Sam Lantinga <slouken@libsdl.org> parents: 2014 diff changeset	66 *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	67 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	68 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	69 }
c121d94672cb SDL 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 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	71 break;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	72
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_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	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;
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	79 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	80 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	81 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	82 (Uint16) ((src[2] << 8) \| src[3]);
2042 3908e1f808e1 Fixed bug #292 Sam Lantinga <slouken@libsdl.org> parents: 2014 diff changeset	83 sample /= 2;
3908e1f808e1 Fixed bug #292 Sam Lantinga <slouken@libsdl.org> parents: 2014 diff changeset	84 dst[1] = (sample & 0xFF);
3908e1f808e1 Fixed bug #292 Sam Lantinga <slouken@libsdl.org> parents: 2014 diff changeset	85 sample >>= 8;
3908e1f808e1 Fixed bug #292 Sam Lantinga <slouken@libsdl.org> parents: 2014 diff changeset	86 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	87 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	88 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	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 } 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	91 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	92 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	93 (Uint16) ((src[3] << 8) \| src[2]);
2042 3908e1f808e1 Fixed bug #292 Sam Lantinga <slouken@libsdl.org> parents: 2014 diff changeset	94 sample /= 2;
3908e1f808e1 Fixed bug #292 Sam Lantinga <slouken@libsdl.org> parents: 2014 diff changeset	95 dst[0] = (sample & 0xFF);
3908e1f808e1 Fixed bug #292 Sam Lantinga <slouken@libsdl.org> parents: 2014 diff changeset	96 sample >>= 8;
3908e1f808e1 Fixed bug #292 Sam Lantinga <slouken@libsdl.org> parents: 2014 diff changeset	97 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	98 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	99 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	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 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	102 }
c121d94672cb SDL 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 break;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	104
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	105 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	106 {
c121d94672cb SDL 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 Uint8 src, dst;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	108
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	109 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	110 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	111 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	112 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	113 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	114 (Sint16) ((src[2] << 8) \| src[3]);
2042 3908e1f808e1 Fixed bug #292 Sam Lantinga <slouken@libsdl.org> parents: 2014 diff changeset	115 sample /= 2;
3908e1f808e1 Fixed bug #292 Sam Lantinga <slouken@libsdl.org> parents: 2014 diff changeset	116 dst[1] = (sample & 0xFF);
3908e1f808e1 Fixed bug #292 Sam Lantinga <slouken@libsdl.org> parents: 2014 diff changeset	117 sample >>= 8;
3908e1f808e1 Fixed bug #292 Sam Lantinga <slouken@libsdl.org> parents: 2014 diff changeset	118 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	119 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	120 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	121 }
c121d94672cb SDL 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 } 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	123 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	124 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	125 (Sint16) ((src[3] << 8) \| src[2]);
2042 3908e1f808e1 Fixed bug #292 Sam Lantinga <slouken@libsdl.org> parents: 2014 diff changeset	126 sample /= 2;
3908e1f808e1 Fixed bug #292 Sam Lantinga <slouken@libsdl.org> parents: 2014 diff changeset	127 dst[0] = (sample & 0xFF);
3908e1f808e1 Fixed bug #292 Sam Lantinga <slouken@libsdl.org> parents: 2014 diff changeset	128 sample >>= 8;
3908e1f808e1 Fixed bug #292 Sam Lantinga <slouken@libsdl.org> parents: 2014 diff changeset	129 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	130 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	131 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	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 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	134 }
c121d94672cb SDL 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 break;
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	136
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	137 case AUDIO_S32:
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	138 {
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	139 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	140 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	141 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	142 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	143 const Sint64 added =
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	144 (((Sint64) (Sint32) SDL_SwapBE32(src[0])) +
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	145 ((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	146 *(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	147 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	148 } else {
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	149 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	150 const Sint64 added =
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	151 (((Sint64) (Sint32) SDL_SwapLE32(src[0])) +
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	152 ((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	153 *(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	154 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	155 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	156 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	157 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	158
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	159 case AUDIO_F32:
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	160 {
2014 7abe37467fa5 Replaced unions with calls to SDL_SwapFloat... Ryan C. Gordon <icculus@icculus.org> parents: 1985 diff changeset	161 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	162 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	163 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	164 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	165 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	166 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	167 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	168 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	169 *(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	170 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	171 } else {
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) {
2049 5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk. Ryan C. Gordon <icculus@icculus.org> parents: 2042 diff changeset	173 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	174 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	175 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	176 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	177 *(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	178 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	179 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	180 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	181 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	182 }
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	183
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	184 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	185 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	186 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	187 }
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	188 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	189
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	190
942 41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	191 /* 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	192 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	193 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	194 {
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	195 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	196
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	197 #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	198 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	199 #endif
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	200
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	201 #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	202 { \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	203 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	204 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	205 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	206 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	207 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	208 src += 6; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	209 dst += 2; \
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 }
942 41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 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 /* 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	214 switch (SDL_AUDIO_BITSIZE(format)) {
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	215 case 8:
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	216 strip_chans_6_to_2(Uint8);
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	217 break;
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	218 case 16:
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	219 strip_chans_6_to_2(Uint16);
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	220 break;
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	221 case 32:
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	222 strip_chans_6_to_2(Uint32);
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	223 break;
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	224 }
942 41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	225
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	226 #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	227
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	228 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	229 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	230 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	231 }
942 41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	232 }
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	233
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	234
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	235 /* 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	236 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	237 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	238 {
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	239 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	240
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	241 #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	242 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	243 #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	244
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	245 #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	246 { \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	247 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	248 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	249 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	250 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	251 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	252 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	253 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	254 src += 6; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	255 dst += 4; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	256 } \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	257 }
942 41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	258
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	259 /* 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	260 switch (SDL_AUDIO_BITSIZE(format)) {
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	261 case 8:
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	262 strip_chans_6_to_4(Uint8);
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	263 break;
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	264 case 16:
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	265 strip_chans_6_to_4(Uint16);
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	266 break;
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	267 case 32:
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	268 strip_chans_6_to_4(Uint32);
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	269 break;
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	270 }
942 41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	271
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	272 #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	273
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	274 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	275 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	276 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	277 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	278 }
942 41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	279 }
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	280
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	281 /* 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	282 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	283 SDL_ConvertStereo(SDL_AudioCVT * cvt, SDL_AudioFormat format)
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	284 {
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	285 int i;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	286
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	287 #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	288 fprintf(stderr, "Converting to stereo\n");
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	289 #endif
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	290
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	291 #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	292 { \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	293 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	294 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	295 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	296 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	297 dst -= 2; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	298 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	299 } \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	300 }
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	301
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	302 /* 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	303 switch (SDL_AUDIO_BITSIZE(format)) {
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	304 case 8:
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	305 dup_chans_1_to_2(Uint8);
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	306 break;
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	307 case 16:
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	308 dup_chans_1_to_2(Uint16);
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	309 break;
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	310 case 32:
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	311 dup_chans_1_to_2(Uint32);
8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	312 break;
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	313 }
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	314
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	315 #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	316
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	317 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	318 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	319 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	320 }
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	321 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	322
942 41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	323
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	324 /* 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	325 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	326 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	327 {
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	328 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	329
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	330 #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	331 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	332 #endif
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	333
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	334 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	335 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	336 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	337 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	338
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	339 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	340 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	341 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	342 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	343 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	344 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	345 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	346 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	347 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	348 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	349 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	350 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	351 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	352 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	353 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	354 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	355 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	356
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	357 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	358 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	359 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	360
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 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	362 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	363 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	364 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	365 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	366 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	367 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	368 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	369 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	370 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	371 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	372 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	373 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	374 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	375 }
c121d94672cb SDL 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 }
c121d94672cb SDL 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 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	378
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	379 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	380 {
c121d94672cb SDL 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 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	382 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	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 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	385 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	386
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	387 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	388 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	389 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	390 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	391 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	392 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	393 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	394 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	395 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	396 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	397 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	398 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	399 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	400
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	401 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	402 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	403 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	404 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	405
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	406 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	407 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	408 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	409 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	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 } 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	412 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	413 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	414 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	415 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	416 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	417 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	418 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	419 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	420 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	421 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	422 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	423 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	424
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	425 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	426 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	427 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	428 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	429
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	430 dst[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	431 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	432 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	433 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	434 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	435 }
c121d94672cb SDL 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 }
c121d94672cb SDL 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 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	438
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	439 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	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 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	442 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	443
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	444 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	445 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	446
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	447 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	448 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	449 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	450 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	451 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	452 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	453 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	454 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	455 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	456 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	457 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	458 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	459 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	460
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	461 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	462 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	463 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	464 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	465
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	466 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	467 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	468 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	469 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	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 } 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	472 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	473 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	474 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	475 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	476 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	477 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	478 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	479 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	480 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	481 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	482 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	483 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	484
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	485 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	486 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	487 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	488 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	489
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	490 dst[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	491 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	492 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	493 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	494 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	495 }
c121d94672cb SDL 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 }
c121d94672cb SDL 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 break;
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	498
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	499 case AUDIO_S32:
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	500 {
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	501 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	502 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	503 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	504
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	505 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	506 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	507 dst -= 6;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	508 src -= 2;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	509 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	510 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	511 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	512 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	513 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	514 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	515 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	516 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	517 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	518 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	519 } else {
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	520 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	521 dst -= 6;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	522 src -= 2;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	523 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	524 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	525 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	526 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	527 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	528 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	529 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	530 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	531 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	532 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	533 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	534 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	535 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	536
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	537 case AUDIO_F32:
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	538 {
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	539 float lf, rf, ce;
2014 7abe37467fa5 Replaced unions with calls to SDL_SwapFloat... Ryan C. Gordon <icculus@icculus.org> parents: 1985 diff changeset	540 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	541 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	542
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	543 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	544 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	545 dst -= 6;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	546 src -= 2;
2014 7abe37467fa5 Replaced unions with calls to SDL_SwapFloat... Ryan C. Gordon <icculus@icculus.org> parents: 1985 diff changeset	547 lf = SDL_SwapFloatBE(src[0]);
7abe37467fa5 Replaced unions with calls to SDL_SwapFloat... Ryan C. Gordon <icculus@icculus.org> parents: 1985 diff changeset	548 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	549 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	550 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	551 dst[1] = src[1];
2014 7abe37467fa5 Replaced unions with calls to SDL_SwapFloat... Ryan C. Gordon <icculus@icculus.org> parents: 1985 diff changeset	552 dst[2] = SDL_SwapFloatBE(lf - ce);
7abe37467fa5 Replaced unions with calls to SDL_SwapFloat... Ryan C. Gordon <icculus@icculus.org> parents: 1985 diff changeset	553 dst[3] = SDL_SwapFloatBE(rf - ce);
7abe37467fa5 Replaced unions with calls to SDL_SwapFloat... Ryan C. Gordon <icculus@icculus.org> parents: 1985 diff changeset	554 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	555 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	556 } else {
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	557 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	558 dst -= 6;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	559 src -= 2;
2014 7abe37467fa5 Replaced unions with calls to SDL_SwapFloat... Ryan C. Gordon <icculus@icculus.org> parents: 1985 diff changeset	560 lf = SDL_SwapFloatLE(src[0]);
7abe37467fa5 Replaced unions with calls to SDL_SwapFloat... Ryan C. Gordon <icculus@icculus.org> parents: 1985 diff changeset	561 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	562 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	563 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	564 dst[1] = src[1];
2014 7abe37467fa5 Replaced unions with calls to SDL_SwapFloat... Ryan C. Gordon <icculus@icculus.org> parents: 1985 diff changeset	565 dst[2] = SDL_SwapFloatLE(lf - ce);
7abe37467fa5 Replaced unions with calls to SDL_SwapFloat... Ryan C. Gordon <icculus@icculus.org> parents: 1985 diff changeset	566 dst[3] = SDL_SwapFloatLE(rf - ce);
7abe37467fa5 Replaced unions with calls to SDL_SwapFloat... Ryan C. Gordon <icculus@icculus.org> parents: 1985 diff changeset	567 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	568 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	569 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	570 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	571 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	572
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	573 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	574 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	575 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	576 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	577 }
942 41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	578 }
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	579
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	580
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	581 /* 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	582 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	583 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	584 {
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	585 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	586
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	587 #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	588 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	589 #endif
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	590
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	591 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	592 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	593 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	594 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	595
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	596 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	597 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	598 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	599 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	600 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	601 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	602 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	603 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	604 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	605 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	606 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	607 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	608 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	609 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	610 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	611
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	612 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	613 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	614 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	615
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	616 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	617 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	618 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	619 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	620 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	621 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	622 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	623 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	624 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	625 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	626 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	627 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	628 }
c121d94672cb SDL 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 }
c121d94672cb SDL 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 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	631
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	632 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	633 {
c121d94672cb SDL 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 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	635 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	636
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	637 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	638 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	639
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	640 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	641 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	642 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	643 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	644 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	645 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	646 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	647 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	648 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	649 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	650 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	651 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	652 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	653
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	654 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	655 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	656 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	657 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	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 } 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	660 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	661 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	662 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	663 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	664 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	665 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	666 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	667 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	668 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	669 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	670 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	671 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	672
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	673 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	674 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	675 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	676 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	677 }
c121d94672cb SDL 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 }
c121d94672cb SDL 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 }
c121d94672cb SDL 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 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	681
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	682 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	683 {
c121d94672cb SDL 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 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	685 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	686
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	687 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	688 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	689
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	690 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	691 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	692 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	693 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	694 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	695 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	696 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	697 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	698 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	699 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	700 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	701 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	702 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	703
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	704 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	705 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	706 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	707 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	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 } 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	710 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	711 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	712 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	713 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	714 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	715 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	716 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	717 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	718 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	719 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	720 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	721 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	722
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	723 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	724 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	725 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	726 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	727 }
c121d94672cb SDL 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 }
c121d94672cb SDL 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 }
c121d94672cb SDL 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 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	731
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	732 case AUDIO_S32:
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	733 {
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	734 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	735 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	736 Sint32 lf, rf, ce;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	737
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	738 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	739 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	740 dst -= 4;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	741 src -= 2;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	742 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	743 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	744 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	745 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	746 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	747 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	748 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	749 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	750 } else {
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	751 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	752 dst -= 4;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	753 src -= 2;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	754 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	755 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	756 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	757 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	758 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	759 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	760 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	761 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	762 }
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	763 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	764 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	765 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	766 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	767 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	768 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	769 }
942 41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	770 }
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	771
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	772 /* 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	773 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	774 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	775 {
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	776 int i;
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	777
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	778 #ifdef DEBUG_CONVERT
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	779 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	780 #endif
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	781
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	782 #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	783 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	784 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	785 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	786 src--; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	787 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	788 dst -= 2; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	789 } \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	790 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	791
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	792 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	793 case 8:
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	794 mul2_mono(Uint8);
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	795 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	796 case 16:
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	797 mul2_mono(Uint16);
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	798 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	799 case 32:
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	800 mul2_mono(Uint32);
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	801 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	802 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	803
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	804 #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	805
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	806 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	807 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	808 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	809 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	810 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	811
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	812
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	813 /* 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	814 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	815 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	816 {
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	817 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	818
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	819 #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	820 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	821 #endif
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	822
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	823 #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	824 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	825 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	826 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	827 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	828 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	829 src -= 2; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	830 dst[-1] = r; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	831 dst[-2] = l; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	832 dst[-3] = r; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	833 dst[-4] = l; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	834 dst -= 4; \
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 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	837
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	838 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	839 case 8:
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	840 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	841 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	842 case 16:
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	843 mul2_stereo(Uint16);
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	844 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	845 case 32:
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	846 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	847 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	848 }
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	849
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	850 #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	851
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	852 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	853 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	854 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	855 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	856 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	857
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	858 /* 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	859 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	860 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	861 {
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	862 int i;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	863
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	864 #ifdef DEBUG_CONVERT
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	865 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	866 #endif
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	867
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	868 #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	869 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	870 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	871 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	872 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	873 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	874 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	875 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	876 src -= 4; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	877 dst[-1] = c1; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	878 dst[-2] = c2; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	879 dst[-3] = c3; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	880 dst[-4] = c4; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	881 dst[-5] = c1; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	882 dst[-6] = c2; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	883 dst[-7] = c3; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	884 dst[-8] = c4; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	885 dst -= 8; \
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
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	889 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	890 case 8:
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	891 mul2_quad(Uint8);
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	892 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	893 case 16:
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	894 mul2_quad(Uint16);
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	895 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	896 case 32:
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	897 mul2_quad(Uint32);
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	898 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	899 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	900
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	901 #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	902
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	903 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	904 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	905 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	906 }
942 41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	907 }
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	908
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	909
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	910 /* 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	911 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	912 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	913 {
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	914 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	915
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	916 #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	917 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	918 #endif
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	919
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	920 #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	921 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	922 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	923 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	924 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	925 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	926 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	927 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	928 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	929 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	930 src -= 6; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	931 dst[-1] = c1; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	932 dst[-2] = c2; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	933 dst[-3] = c3; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	934 dst[-4] = c4; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	935 dst[-5] = c5; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	936 dst[-6] = c6; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	937 dst[-7] = c1; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	938 dst[-8] = c2; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	939 dst[-9] = c3; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	940 dst[-10] = c4; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	941 dst[-11] = c5; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	942 dst[-12] = c6; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	943 dst -= 12; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	944 } \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	945 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	946
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	947 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	948 case 8:
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	949 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	950 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	951 case 16:
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	952 mul2_chansix(Uint16);
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	953 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	954 case 32:
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	955 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	956 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	957 }
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	958
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	959 #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	960
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	961 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	962 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	963 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	964 }
942 41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	965 }
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	966
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	967 /* 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	968 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	969 SDL_RateDIV2(SDL_AudioCVT * cvt, SDL_AudioFormat format)
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	970 {
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	971 int i;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	972
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	973 #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	974 fprintf(stderr, "Converting audio rate / 2 (mono)\n");
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	975 #endif
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	976
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	977 #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	978 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	979 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	980 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	981 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	982 src += 2; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	983 dst++; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	984 } \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	985 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	986
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	987 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	988 case 8:
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	989 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	990 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	991 case 16:
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	992 div2_mono(Uint16);
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	993 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	994 case 32:
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	995 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	996 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	997 }
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	998
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	999 #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	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 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	1002 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	1003 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	1004 }
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1005 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1006
942 41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	1007
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	1008 /* 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	1009 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1010 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	1011 {
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	1012 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	1013
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	1014 #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	1015 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	1016 #endif
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1017
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	1018 #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	1019 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	1020 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	1021 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	1022 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	1023 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	1024 src += 4; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1025 dst += 2; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1026 } \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1027 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1028
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1029 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	1030 case 8:
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1031 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	1032 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	1033 case 16:
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1034 div2_stereo(Uint16);
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1035 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1036 case 32:
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1037 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	1038 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	1039 }
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1040
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	1041 #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	1042
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	1043 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	1044 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	1045 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	1046 }
942 41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	1047 }
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	1048
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	1049
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	1050 /* 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	1051 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1052 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	1053 {
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	1054 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	1055
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	1056 #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	1057 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	1058 #endif
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1059
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	1060 #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	1061 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	1062 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	1063 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	1064 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	1065 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	1066 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	1067 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	1068 src += 8; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1069 dst += 4; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1070 } \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1071 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1072
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1073 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	1074 case 8:
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1075 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	1076 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	1077 case 16:
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1078 div2_quad(Uint16);
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1079 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1080 case 32:
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1081 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	1082 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	1083 }
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1084
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	1085 #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	1086
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	1087 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	1088 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	1089 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	1090 }
942 41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	1091 }
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	1092
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	1093 /* 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	1094 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1095 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	1096 {
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	1097 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	1098
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	1099 #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	1100 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	1101 #endif
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1102
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	1103 #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	1104 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	1105 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	1106 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	1107 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	1108 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	1109 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	1110 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	1111 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	1112 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	1113 src += 12; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1114 dst += 6; \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1115 } \
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1116 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1117
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1118 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	1119 case 8:
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1120 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	1121 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	1122 case 16:
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1123 div2_chansix(Uint16);
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1124 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1125 case 32:
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1126 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	1127 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	1128 }
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1129
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	1130 #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	1131
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	1132 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	1133 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	1134 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	1135 }
942 41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	1136 }
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	1137
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1138 /* 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	1139 static void SDLCALL
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1140 SDL_RateSLOW(SDL_AudioCVT * cvt, SDL_AudioFormat format)
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1141 {
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	1142 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	1143 int i, clen;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1144
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1145 #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	1146 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	1147 #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	1148 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	1149 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	1150 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	1151 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	1152 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1153 Uint8 *output;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1154
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	1155 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	1156 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	1157 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	1158 *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	1159 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	1160 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	1161 }
c121d94672cb SDL 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 }
c121d94672cb SDL 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 break;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1164
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	1165 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	1166 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1167 Uint16 *output;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1168
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	1169 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	1170 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	1171 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	1172 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	1173 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	1174 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	1175 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	1176 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1177 }
c121d94672cb SDL 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 break;
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1179
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1180 case 32:
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1181 {
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1182 /* !!! 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	1183 #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	1184 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	1185 #endif
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1186 }
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	1187 }
c121d94672cb SDL 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 } else {
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1189 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	1190 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	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 Uint8 *output;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1193
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1194 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	1195 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	1196 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	1197 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	1198 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	1199 *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	1200 }
c121d94672cb SDL 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 }
c121d94672cb SDL 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 break;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1203
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	1204 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	1205 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1206 Uint16 *output;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1207
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	1208 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	1209 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	1210 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	1211 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	1212 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	1213 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	1214 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	1215 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1216 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1217 break;
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1218
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1219 case 32:
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1220 {
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1221 /* !!! 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	1222 #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	1223 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	1224 #endif
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1225 }
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	1226 }
c121d94672cb SDL 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 }
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1228
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	1229 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	1230 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	1231 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	1232 }
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1233 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1234
2655 b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1235 /* Perform proper resampling */
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1236 static void SDLCALL
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1237 SDL_Resample(SDL_AudioCVT * cvt, SDL_AudioFormat format)
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1238 {
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1239 int i, j;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1240
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1241 #ifdef DEBUG_CONVERT
2656 dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1242 printf("Converting audio rate via proper resampling (mono)\n");
2655 b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1243 #endif
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1244
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1245 #define zerostuff_mono(type) { \
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1246 const type src = (const type ) (cvt->buf + cvt->len_cvt); \
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1247 type dst = (type ) (cvt->buf + (cvt->len_cvt * cvt->len_mult)); \
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1248 for (i = cvt->len_cvt / sizeof (type); i; --i) { \
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1249 src--; \
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1250 dst[-1] = src[0]; \
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1251 for( j = -cvt->len_mult; j < -1; ++j ) { \
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1252 dst[j] = 0; \
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1253 } \
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1254 dst -= cvt->len_mult; \
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1255 } \
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1256 }
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1257
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1258 #define discard_mono(type) { \
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1259 const type src = (const type ) (cvt->buf); \
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1260 type dst = (type ) (cvt->buf); \
2656 dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1261 for (i = 0; i < cvt->len_cvt / cvt->len_div / sizeof (type); ++i) { \
2655 b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1262 dst[0] = src[0]; \
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1263 src += cvt->len_div; \
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1264 ++dst; \
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1265 } \
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1266 }
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1267
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1268 // Step 1: Zero stuff the conversion buffer
2656 dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1269 #ifdef DEBUG_CONVERT
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1270 printf("Zero-stuffing by a factor of %u\n", cvt->len_mult);
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1271 #endif
2655 b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1272 switch (SDL_AUDIO_BITSIZE(format)) {
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1273 case 8:
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1274 zerostuff_mono(Uint8);
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1275 break;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1276 case 16:
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1277 zerostuff_mono(Uint16);
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1278 break;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1279 case 32:
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1280 zerostuff_mono(Uint32);
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1281 break;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1282 }
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1283
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1284 cvt->len_cvt *= cvt->len_mult;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1285
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1286 // Step 2: Use either a windowed sinc FIR filter or IIR lowpass filter to remove all alias frequencies
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1287
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1288 // Step 3: Discard unnecessary samples
2656 dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1289 #ifdef DEBUG_CONVERT
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1290 printf("Discarding samples by a factor of %u\n", cvt->len_div);
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1291 #endif
2655 b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1292 switch (SDL_AUDIO_BITSIZE(format)) {
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1293 case 8:
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1294 discard_mono(Uint8);
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1295 break;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1296 case 16:
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1297 discard_mono(Uint16);
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1298 break;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1299 case 32:
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1300 discard_mono(Uint32);
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1301 break;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1302 }
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1303
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1304 #undef zerostuff_mono
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1305 #undef discard_mono
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1306
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1307 cvt->len_cvt /= cvt->len_div;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1308
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1309 if (cvt->filters[++cvt->filter_index]) {
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1310 cvt->filters[cvt->filter_index] (cvt, format);
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1311 }
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1312 }
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1313
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	1314 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	1315 SDL_ConvertAudio(SDL_AudioCVT * cvt)
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1316 {
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	1317 /* 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	1318 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	1319 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	1320 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	1321 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1322 /* 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	1323 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	1324 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	1325 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	1326 }
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1327
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	1328 /* 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	1329 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	1330 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	1331 return (0);
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1332 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1333
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1334
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1335 static SDL_AudioFilter
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1336 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	1337 {
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1338 /*
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1339 * 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	1340 * 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	1341 */
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1342
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	1343 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	1344 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1345
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1346
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1347 /*
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1348 * 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	1349 * 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	1350 * 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	1351 * specific data types.
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1352 */
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1353 static int
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1354 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	1355 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	1356 {
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1357 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	1358 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	1359 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	1360 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	1361
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1362 /* 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	1363 if (filter == NULL) {
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1364 int i;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1365 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	1366 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	1367 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	1368 filter = filt->filter;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1369 break;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1370 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1371 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1372
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1373 if (filter == NULL) {
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	1374 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	1375 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1376 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1377
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1378 /* 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	1379 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	1380 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	1381 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	1382 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	1383 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	1384 } 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	1385 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	1386 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1387
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	1388 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	1389 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1390
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	1391 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	1392 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1393
2655 b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1394 /* Generate the necessary IIR lowpass coefficients for resampling.
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1395 Assume that the SDL_AudioCVT struct is already set up with
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1396 the correct values for len_mult and len_div, and use the
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1397 type of dst_format. Also assume the buffer is allocated.
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1398 Note the buffer needs to be 6 units long.
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1399 For now, use RBJ's cookbook coefficients. It might be more
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1400 optimal to create a Butterworth filter, but this is more difficult.
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1401 */
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1402 int SDL_BuildIIRLowpass(SDL_AudioCVT * cvt, SDL_AudioFormat format) {
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1403 float fc; /* cutoff frequency */
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1404 float coeff[6]; /* floating point iir coefficients b0, b1, b2, a0, a1, a2 */
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1405 float scale;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1406 float w0, alpha, cosw0;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1407
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1408 /* The higher Q is, the higher CUTOFF can be. Need to find a good balance to avoid aliasing */
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1409 static const float Q = 5.0f;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1410 static const float CUTOFF = 0.4f;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1411
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1412 fc = (cvt->len_mult > cvt->len_div) ? CUTOFF / (float)cvt->len_mult : CUTOFF / (float)cvt->len_div;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1413
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1414 w0 = 2.0f * M_PI * fc;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1415 cosw0 = cosf(w0);
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1416 alpha = sin(w0) / (2.0f * Q);
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1417
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1418 /* Compute coefficients, normalizing by a0 */
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1419 scale = 1.0f / (1.0f + alpha);
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1420
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1421 coeff[0] = (1.0f - cosw0) / 2.0f * scale;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1422 coeff[1] = (1.0f - cosw0) * scale;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1423 coeff[2] = coeff[0];
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1424
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1425 coeff[3] = 1.0f; /* a0 is normalized to 1 */
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1426 coeff[4] = -2.0f * cosw0 * scale;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1427 coeff[5] = (1.0f - alpha) * scale;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1428
2656 dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1429 /* Copy the coefficients to the struct. If necessary, convert coefficients to fixed point, using the range (-2.0, 2.0) */
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1430 if(SDL_AUDIO_ISFLOAT(format) && SDL_AUDIO_BITSIZE(format) == 32) {
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1431 float cvt_coeff = (float )cvt->coeff;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1432 int i;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1433 for(i = 0; i < 6; ++i) {
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1434 cvt_coeff[i] = coeff[i];
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1435 }
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1436 } else {
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1437 }
2655 b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1438
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1439 /* Initialize the state buffer to all zeroes, and set initial position */
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1440 memset(cvt->state_buf, 0, 4 * SDL_AUDIO_BITSIZE(format) / 4);
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1441 cvt->state_pos = 0;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1442 }
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1443
2656 dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1444 /* Apply the lowpass IIR filter to the given SDL_AudioCVT struct */
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1445 int SDL_FilterIIR(SDL_AudioCVT * cvt, SDL_AudioFormat format) {
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1446 int i, n;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1447
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1448 n = cvt->len_cvt / (SDL_AUDIO_BITSIZE(format) / 4);
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1449
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1450 if(SDL_AUDIO_ISFLOAT(format) && SDL_AUDIO_BITSIZE(format) == 32) {
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1451 float coeff = (float )cvt->coeff;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1452 float state = (float )cvt->state_buf;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1453 float buf = (float )cvt->buf;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1454 float temp;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1455
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1456
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1457 for(i = 0; i < n; ++i) {
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1458 /* y[n] = b0 * x[n] + b1 * x[n-1] + b2 * x[n-2] - a1 * y[n-1] - a[2] * y[n-2] */
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1459 temp = buf[n];
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1460 if( cvt->state_pos ) {
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1461 buf[n] = coeff[0] * buf[n] + coeff[1] * state[0] + coeff[2] * state[1] - coeff[4] * state[2] - coeff[5] * state[3];
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1462 state[1] = temp;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1463 state[3] = buf[n];
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1464 cvt->state_pos = 0;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1465 } else {
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1466 buf[n] = coeff[0] * buf[n] + coeff[1] * state[1] + coeff[2] * state[0] - coeff[4] * state[3] - coeff[5] * state[2];
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1467 state[0] = temp;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1468 state[2] = buf[n];
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1469 cvt->state_pos = 1;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1470 }
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1471 }
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1472 } else {
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1473 }
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1474 }
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1475
2655 b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1476 /* Apply the windowed sinc FIR filter to the given SDL_AudioCVT struct */
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1477 int SDL_FilterFIR(SDL_AudioCVT * cvt, SDL_AudioFormat format) {
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1478 int n = cvt->len_cvt / (SDL_AUDIO_BITSIZE(format) / 4);
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1479 int m = cvt->len_sinc;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1480 int i, j;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1481
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1482 /* Note: this makes use of the symmetry of the sinc filter.
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1483 We can also make a big optimization here by taking advantage
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1484 of the fact that the signal is zero stuffed, so we can do
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1485 significantly fewer multiplications and additions.
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1486 */
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1487 #define filter_sinc(type, shift_bits) { \
2656 dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1488 type sinc = (type )cvt->coeff; \
2655 b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1489 type state = (type )cvt->state_buf; \
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1490 type buf = (type )cvt->buf; \
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1491 for(i = 0; i < n; ++i) { \
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1492 state[cvt->state_pos++] = buf[i] >> shift_bits; \
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1493 if(cvt->state_pos == m) cvt->state_pos = 0; \
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1494 buf[i] = 0; \
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1495 for(j = 0; j < m; ++j) { \
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1496 buf[i] += state[j] * sinc[j]; \
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1497 } \
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1498 } \
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1499 }
2656 dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1500
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1501 /* If it's floating point, we don't need to do any shifting */
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1502 if(SDL_AUDIO_ISFLOAT(format) && SDL_AUDIO_BITSIZE(format) == 32) {
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1503 float sinc = (float )cvt->coeff;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1504 float state = (float )cvt->state_buf;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1505 float buf = (float )cvt->buf;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1506
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1507 for(i = 0; i < n; ++i) {
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1508 state[cvt->state_pos++] = buf[i];
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1509 if(cvt->state_pos == m) cvt->state_pos = 0;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1510 buf[i] = 0.0f;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1511 for(j = 0; j < m; ++j) {
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1512 buf[i] += state[j] * sinc[j];
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1513 }
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1514 }
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1515 } else {
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1516 switch (SDL_AUDIO_BITSIZE(format)) {
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1517 case 8:
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1518 filter_sinc(Uint8, 4);
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1519 break;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1520 case 16:
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1521 filter_sinc(Uint16, 8);
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1522 break;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1523 case 32:
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1524 filter_sinc(Uint32, 16);
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1525 break;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1526 }
2655 b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1527 }
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1528
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1529 #undef filter_sinc
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1530
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1531 }
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1532
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1533 /* Generate the necessary windowed sinc filter for resampling.
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1534 Assume that the SDL_AudioCVT struct is already set up with
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1535 the correct values for len_mult and len_div, and use the
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1536 type of dst_format. Also assume the buffer is allocated.
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1537 Note the buffer needs to be m+1 units long.
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1538 */
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1539 int
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1540 SDL_BuildWindowedSinc(SDL_AudioCVT * cvt, SDL_AudioFormat format, unsigned int m) {
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1541 float fScale; /* scale factor for fixed point */
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1542 float fSinc; / floating point sinc buffer, to be converted to fixed point */
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1543 float fc; /* cutoff frequency */
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1544 float two_pi_fc, two_pi_over_m, four_pi_over_m, m_over_two;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1545 float norm_sum, norm_fact;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1546 unsigned int i;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1547
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1548 /* Check that the buffer is allocated */
2656 dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1549 if( cvt->coeff == NULL ) {
2655 b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1550 return -1;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1551 }
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1552
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1553 /* Set the length */
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1554 cvt->len_sinc = m;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1555
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1556 /* Allocate the floating point windowed sinc. */
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1557 fSinc = (float )malloc(m sizeof(float));
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1558 if( fSinc == NULL ) {
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1559 return -1;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1560 }
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1561
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1562 /* Set up the filter parameters */
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1563 fc = (cvt->len_mult > cvt->len_div) ? 0.5f / (float)cvt->len_mult : 0.5f / (float)cvt->len_div;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1564 two_pi_fc = 2.0f * M_PI * fc;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1565 two_pi_over_m = 2.0f * M_PI / (float)m;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1566 four_pi_over_m = 2.0f * two_pi_over_m;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1567 m_over_two = (float)m / 2.0f;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1568 norm_sum = 0.0f;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1569
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1570 for(i = 0; i <= m; ++i ) {
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1571 if( i == m/2 ) {
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1572 fSinc[i] = two_pi_fc;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1573 } else {
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1574 fSinc[i] = sinf(two_pi_fc * ((float)i - m_over_two)) / ((float)i - m_over_two);
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1575 /* Apply blackman window */
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1576 fSinc[i] = 0.42f - 0.5f cosf(two_pi_over_m * (float)i) + 0.08f * cosf(four_pi_over_m * (float)i);
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1577 }
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1578 norm_sum += abs(fSinc[i]);
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1579 }
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1580
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1581 /* Now normalize and convert to fixed point. We scale everything to half the precision
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1582 of whatever datatype we're using, for example, 16 bit data means we use 8 bits */
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1583
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1584 #define convert_fixed(type, size) { \
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1585 norm_fact = size / norm_sum; \
2656 dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1586 type dst = (type )cvt->coeff; \
2655 b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1587 for( i = 0; i <= m; ++i ) { \
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1588 dst[i] = (type)(fSinc[i] * norm_fact); \
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1589 } \
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1590 }
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1591
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1592 /* If we're using floating point, we only need to normalize */
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1593 if(SDL_AUDIO_ISFLOAT(format) && SDL_AUDIO_BITSIZE(format) == 32) {
2656 dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1594 float fDest = (float )cvt->coeff;
2655 b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1595 norm_fact = 1.0f / norm_sum;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1596 for(i = 0; i <= m; ++i) {
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1597 fDest[i] = fSinc[i] * norm_fact;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1598 }
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1599 } else {
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1600 switch (SDL_AUDIO_BITSIZE(format)) {
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1601 case 8:
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1602 convert_fixed(Uint8, 0x0e);
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1603 break;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1604 case 16:
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1605 convert_fixed(Uint16, 0xfe);
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1606 break;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1607 case 32:
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1608 convert_fixed(Uint32, 0xfffe);
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1609 break;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1610 }
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1611 }
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1612
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1613 /* Initialize the state buffer to all zeroes, and set initial position */
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1614 memset(cvt->state_buf, 0, cvt->len_sinc * SDL_AUDIO_BITSIZE(format) / 4);
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1615 cvt->state_pos = 0;
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1616
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1617 /* Clean up */
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1618 #undef convert_fixed
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1619 free(fSinc);
b8e736c8a5a8 Added beginnings of resampling code. Aaron Wishnick <schnarf@gmail.com> parents: 2130 diff changeset	1620 }
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1621
2656 dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1622 /* This is used to reduce the resampling ratio */
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1623 inline int SDL_GCD(int a, int b) {
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1624 int temp;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1625 while(b != 0) {
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1626 temp = a % b;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1627 a = b;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1628 b = temp;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1629 }
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1630 return a;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1631 }
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1632
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1633
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1634 /* 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	1635 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	1636 no conversion needed, or 1 if the audio filter is set up.
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1637 */
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	1638
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1639 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	1640 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	1641 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	1642 SDL_AudioFormat dst_fmt, Uint8 dst_channels, int dst_rate)
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1643 {
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1644 /* 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	1645 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	1646 return -1;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1647 }
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1648 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	1649 return -1;
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1650 }
1985 8055185ae4ed Added source color and alpha modulation support. Sam Lantinga <slouken@libsdl.org> parents: 1982 diff changeset	1651 #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	1652 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	1653 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	1654 #endif
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1655
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	1656 /* 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	1657
3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1658 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	1659 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	1660 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	1661 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	1662 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	1663 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	1664 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	1665
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1666 /* 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	1667 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	1668 return -1; /* shouldn't happen, but just in case... */
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1669
1982 3b4ce57c6215 First shot at new audio data types (int32 and float32). Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	1670 /* 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	1671 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	1672 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	1673 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	1674 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	1675 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	1676 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	1677 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1678 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	1679 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	1680 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	1681 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	1682 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	1683 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1684 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	1685 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	1686 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	1687 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	1688 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	1689 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1690 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	1691 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	1692 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	1693 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	1694 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	1695 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1696 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	1697 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	1698 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	1699 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	1700 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1701 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	1702 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	1703 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	1704 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	1705 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1706 /* 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	1707 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	1708 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	1709 */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1710 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	1711 ((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	1712 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	1713 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	1714 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	1715 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1716 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	1717 /* 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	1718 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1719 }
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1720
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	1721 /* Do rate conversion */
2656 dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1722 int rate_gcd;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1723 rate_gcd = SDL_GCD(src_rate, dst_rate);
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1724 cvt->len_mult = dst_rate / rate_gcd;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1725 cvt->len_div = src_rate / rate_gcd;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1726 cvt->len_ratio = (double)cvt->len_mult / (double)cvt->len_div;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1727 cvt->filters[cvt->filter_index++] = SDL_Resample;
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1728
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1729 /*cvt->rate_incr = 0.0;
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1730 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	1731 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	1732 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	1733 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	1734 SDL_AudioFilter rate_cvt = NULL;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1735
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	1736 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	1737 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	1738 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	1739 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	1740 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	1741 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	1742 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	1743 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	1744 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	1745 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	1746 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	1747 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	1748 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	1749 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	1750 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	1751 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	1752 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	1753 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	1754 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1755 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	1756 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	1757 } 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	1758 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	1759 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	1760 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	1761 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	1762 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	1763 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	1764 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	1765 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	1766 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	1767 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	1768 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	1769 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	1770 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	1771 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	1772 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	1773 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	1774 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	1775 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1776 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	1777 len_ratio = 2.0;
2656 dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1778 }*/
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	1779 /* If hi_rate = lo_rate2^x then conversion is easy /
2656 dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1780 /while (((lo_rate 2) / 100) <= (hi_rate / 100)) {
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1781 cvt->filters[cvt->filter_index++] = rate_cvt;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1782 cvt->len_mult *= len_mult;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1783 lo_rate *= 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1784 cvt->len_ratio *= len_ratio;
2656 dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1785 }*/
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	1786 /* We may need a slow conversion here to finish up */
2656 dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1787 /if ((lo_rate / 100) != (hi_rate / 100)) {/
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1788 #if 1
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1789 /* The problem with this is that if the input buffer is
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1790 say 1K, and the conversion rate is say 1.1, then the
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1791 output buffer is 1.1K, which may not be an acceptable
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1792 buffer size for the audio driver (not a power of 2)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1793 */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1794 /* For now, punt and hope the rate distortion isn't great.
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1795 */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1796 #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	1797 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	1798 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	1799 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	1800 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	1801 } 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	1802 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	1803 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	1804 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1805 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	1806 #endif
2656 dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1807 /* }
dd74182b3c3c Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working. Aaron Wishnick <schnarf@gmail.com> parents: 2655 diff changeset	1808 }*/
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1809
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	1810 /* 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	1811 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	1812 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	1813 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	1814 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	1815 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	1816 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	1817 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	1818 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1769 diff changeset	1819 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	1820 }
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1821
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	1822 /* vi: set ts=4 sw=4 expandtab: */

Mercurial > sdl-ios-xcode

annotate src/audio/SDL_audiocvt.c @ 2656:dd74182b3c3c gsoc2008_audio_resampling