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quakeforge/libs/audio/renderer/snd_mem.c

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/*
snd_mem.c
sound caching
Copyright (C) 1996-1997 Id Software, Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
static __attribute__ ((unused)) const char rcsid[] =
"$Id$";
#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#include "QF/cvar.h"
#include "QF/dstring.h"
#include "QF/sound.h"
#include "QF/sys.h"
#include "QF/qendian.h"
#include "QF/quakefs.h"
#include "compat.h"
#include "snd_render.h"
typedef struct {
byte left;
byte right;
} stereo8_t;
typedef struct {
short left;
short right;
} stereo16_t;
static sfxbuffer_t *
snd_fail (sfx_t *sfx)
{
return 0;
}
static void
snd_noop (sfx_t *sfx)
{
}
sfxbuffer_t *
SND_CacheTouch (sfx_t *sfx)
{
return Cache_Check (&((sfxblock_t *) sfx->data)->cache);
}
sfxbuffer_t *
SND_CacheRetain (sfx_t *sfx)
{
return Cache_TryGet (&((sfxblock_t *) sfx->data)->cache);
}
void
SND_CacheRelease (sfx_t *sfx)
{
Cache_Release (&((sfxblock_t *) sfx->data)->cache);
}
sfxbuffer_t *
SND_StreamRetain (sfx_t *sfx)
{
return &((sfxstream_t *) sfx->data)->buffer;
}
void
SND_StreamRelease (sfx_t *sfx)
{
}
void
SND_Load (sfx_t *sfx)
{
dstring_t *name = dstring_new ();
dstring_t *foundname = dstring_new ();
char *realname;
char buf[4];
QFile *file;
sfx->touch = sfx->retain = snd_fail;
sfx->release = snd_noop;
dsprintf (name, "sound/%s", sfx->name);
_QFS_FOpenFile (name->str, &file, foundname, 1);
if (!file) {
Sys_Printf ("Couldn't load %s\n", name->str);
dstring_delete (name);
dstring_delete (foundname);
return;
}
if (!strequal (foundname->str, name->str)) {
realname = foundname->str;
dstring_delete (name);
free (foundname);
} else {
realname = name->str;
free (name);
dstring_delete (foundname);
}
Qread (file, buf, 4);
Qseek (file, 0, SEEK_SET);
#ifdef HAVE_VORBIS
if (strnequal ("OggS", buf, 4)) {
Sys_DPrintf ("SND_Load: ogg file\n");
SND_LoadOgg (file, sfx, realname);
return;
}
#endif
if (strnequal ("RIFF", buf, 4)) {
Sys_DPrintf ("SND_Load: wav file\n");
SND_LoadWav (file, sfx, realname);
return;
}
free (realname);
}
sfxbuffer_t *
SND_GetCache (long samples, int rate, int inwidth, int channels,
sfxblock_t *block, cache_allocator_t allocator)
{
int size;
int width;
float stepscale;
sfxbuffer_t *sc;
sfx_t *sfx = block->sfx;
width = snd_loadas8bit->int_val ? 1 : 2;
stepscale = (float) rate / shm->speed; // usually 0.5, 1, or 2
size = samples / stepscale;
size *= width * channels;
sc = allocator (&block->cache, sizeof (sfxbuffer_t) + size, sfx->name);
if (!sc)
return 0;
block->bytes = size;
return sc;
}
void
SND_ResampleMono (sfx_t *sfx, sfxbuffer_t *sc, byte *data, int length)
{
unsigned char *ib, *ob;
int fracstep, outcount, sample, samplefrac, srcsample, i;
float stepscale;
short *is, *os;
int inwidth = sfx->width;
int inrate = sfx->speed;
int outwidth;
is = (short *) data;
os = (short *) sc->data;
ib = data;
ob = sc->data;
stepscale = (float) inrate / shm->speed; // usually 0.5, 1, or 2
outcount = length / stepscale;
if (snd_loadas8bit->int_val) {
outwidth = 1;
sc->paint = SND_PaintChannelFrom8;
} else {
outwidth = 2;
sc->paint = SND_PaintChannelFrom16;
}
// resample / decimate to the current source rate
if (stepscale == 1) {
if (inwidth == 1 && outwidth == 1) {
for (i = 0; i < outcount; i++) {
*ob++ = *ib++ - 128;
}
} else if (inwidth == 1 && outwidth == 2) {
for (i = 0; i < outcount; i++) {
*os++ = (*ib++ - 128) << 8;
}
} else if (inwidth == 2 && outwidth == 1) {
for (i = 0; i < outcount; i++) {
*ob++ = LittleShort (*is++) >> 8;
}
} else if (inwidth == 2 && outwidth == 2) {
for (i = 0; i < outcount; i++) {
*os++ = LittleShort (*is++);
}
}
} else {
// general case
if (snd_interp->int_val && stepscale < 1) {
int j;
int points = 1 / stepscale;
for (i = 0; i < length; i++) {
int s1, s2;
if (inwidth == 2) {
s2 = s1 = LittleShort (is[0]);
if (i < length - 1)
s2 = LittleShort (is[1]);
is++;
} else {
s2 = s1 = (ib[0] - 128) << 8;
if (i < length - 1)
s2 = (ib[1] - 128) << 8;
ib++;
}
for (j = 0; j < points; j++) {
sample = s1 + (s2 - s1) * ((float) j) / points;
if (outwidth == 2) {
os[j] = sample;
} else {
ob[j] = sample >> 8;
}
}
if (outwidth == 2) {
os += points;
} else {
ob += points;
}
}
} else {
samplefrac = 0;
fracstep = stepscale * 256;
for (i = 0; i < outcount; i++) {
srcsample = samplefrac >> 8;
samplefrac += fracstep;
if (inwidth == 2)
sample = LittleShort (is[srcsample]);
else
sample = (ib[srcsample] - 128) << 8;
if (outwidth == 2)
os[i] = sample;
else
ob[i] = sample >> 8;
}
}
}
}
void
SND_ResampleStereo (sfx_t *sfx, sfxbuffer_t *sc, byte *data, int length)
{
int fracstep, outcount, sl, sr, samplefrac, srcsample, i;
float stepscale;
stereo8_t *ib, *ob;
stereo16_t *is, *os;
int inwidth = sfx->width;
int inrate = sfx->speed;
int outwidth;
is = (stereo16_t *) data;
os = (stereo16_t *) sc->data;
ib = (stereo8_t *) data;
ob = (stereo8_t *) sc->data;
stepscale = (float) inrate / shm->speed; // usually 0.5, 1, or 2
outcount = length / stepscale;
if (snd_loadas8bit->int_val) {
outwidth = 1;
sc->paint = SND_PaintChannelStereo8;
} else {
outwidth = 2;
sc->paint = SND_PaintChannelStereo16;
}
// resample / decimate to the current source rate
if (stepscale == 1) {
if (inwidth == 1 && outwidth == 1) {
for (i = 0; i < outcount; i++, ob++, ib++) {
ob->left = ib->left - 128;
ob->right = ib->right - 128;
}
} else if (inwidth == 1 && outwidth == 2) {
for (i = 0; i < outcount; i++, os++, ib++) {
os->left = (ib->left - 128) << 8;
os->right = (ib->right - 128) << 8;
}
} else if (inwidth == 2 && outwidth == 1) {
for (i = 0; i < outcount; i++, ob++, ib++) {
ob->left = LittleShort (is->left) >> 8;
ob->right = LittleShort (is->right) >> 8;
}
} else if (inwidth == 2 && outwidth == 2) {
for (i = 0; i < outcount; i++, os++, is++) {
os->left = LittleShort (is->left);
os->right = LittleShort (is->right);
}
}
} else {
// general case
if (snd_interp->int_val && stepscale < 1) {
int j;
int points = 1 / stepscale;
for (i = 0; i < length; i++) {
int sl1, sl2;
int sr1, sr2;
if (inwidth == 2) {
sl2 = sl1 = LittleShort (is[0].left);
sr2 = sr1 = LittleShort (is[0].right);
if (i < length - 1) {
sl2 = LittleShort (is[1].left);
sr2 = LittleShort (is[1].right);
}
is++;
} else {
sl2 = sl1 = (ib[0].left - 128) << 8;
sr2 = sr1 = (ib[0].right - 128) << 8;
if (i < length - 1) {
sl2 = (ib[1].left - 128) << 8;
sr2 = (ib[1].right - 128) << 8;
}
ib++;
}
for (j = 0; j < points; j++) {
sl = sl1 + (sl2 - sl1) * ((float) j) / points;
sr = sr1 + (sr2 - sr1) * ((float) j) / points;
if (outwidth == 2) {
os[j].left = sl;
os[j].right = sr;
} else {
ob[j].left = sl >> 8;
ob[j].right = sr >> 8;
}
}
if (outwidth == 2) {
os += points;
} else {
ob += points;
}
}
} else {
samplefrac = 0;
fracstep = stepscale * 256;
for (i = 0; i < outcount; i++) {
srcsample = samplefrac >> 8;
samplefrac += fracstep;
if (inwidth == 2) {
sl = LittleShort (is[srcsample].left);
sr = LittleShort (is[srcsample].right);
} else {
sl = (ib[srcsample].left - 128) << 8;
sr = (ib[srcsample].right - 128) << 8;
}
if (outwidth == 2) {
os[i].left = sl;
os[i].right = sr;
} else {
ob[i].left = sl >> 8;
ob[i].right = sr >> 8;
}
}
}
}
}
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