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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"
#define SAMPLE_GAP 4
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)
{
}
static sfx_t *
snd_open (sfx_t *sfx)
{
return 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)
{
}
wavinfo_t *
SND_CacheWavinfo (sfx_t *sfx)
{
return &((sfxblock_t *) sfx->data)->wavinfo;
}
wavinfo_t *
SND_StreamWavinfo (sfx_t *sfx)
{
return &((sfxstream_t *) sfx->data)->wavinfo;
}
static void
read_samples (sfxbuffer_t *buffer, int count, void *prev)
{
if (buffer->head + count > buffer->length) {
int s = (buffer->length - 1);
count -= buffer->length - buffer->head;
read_samples (buffer, buffer->length - buffer->head, prev);
prev = buffer->data + s * buffer->bps;
read_samples (buffer, count, prev);
} else {
byte *data;
float stepscale;
int samples, size;
sfx_t *sfx = buffer->sfx;
sfxstream_t *stream = (sfxstream_t *) sfx->data;
wavinfo_t *info = &stream->wavinfo;
stepscale = (float) info->rate / shm->speed; // usually 0.5, 1, or 2
samples = count * stepscale;
size = samples * info->width * info->channels;
data = alloca (size);
if (stream->resample) {
if (stream->read (stream->file, data, size, info) != size)
Sys_Printf ("%s r\n", sfx->name);
stream->resample (buffer, data, samples, prev);
} else {
if (stream->read (stream->file, buffer->data, size, info) != size)
Sys_Printf ("%s nr\n", sfx->name);
}
buffer->head += count;
if (buffer->head >= buffer->length)
buffer->head -= buffer->length;
}
}
static void
fill_buffer (sfx_t *sfx, sfxstream_t *stream, sfxbuffer_t *buffer,
wavinfo_t *info, unsigned int headpos)
{
void *prev;
unsigned int samples;
unsigned int loop_samples = 0;
// find out how many samples can be read into the buffer
samples = buffer->tail - buffer->head - SAMPLE_GAP;
if (buffer->tail <= buffer->head)
samples += buffer->length;
if (headpos + samples > sfx->length) {
if (sfx->loopstart == (unsigned int)-1) {
samples = sfx->length - headpos;
} else {
loop_samples = headpos + samples - sfx->length;
samples -= loop_samples;
}
}
if (samples) {
if (buffer->head != buffer->tail) {
int s = buffer->head - 1;
if (!buffer->head)
s += buffer->length;
prev = buffer->data + s * buffer->bps;
} else {
prev = 0;
}
read_samples (buffer, samples, prev);
}
if (loop_samples) {
if (buffer->head != buffer->tail) {
int s = buffer->head - 1;
if (!buffer->head)
s += buffer->length;
prev = buffer->data + s * buffer->bps;
} else {
prev = 0;
}
stream->seek (stream->file, info->loopstart, info);
read_samples (buffer, loop_samples, prev);
}
}
void
SND_StreamSetPos (sfxbuffer_t *buffer, unsigned int pos)
{
float stepscale;
sfx_t *sfx = buffer->sfx;
sfxstream_t *stream = (sfxstream_t *) sfx->data;
wavinfo_t *info = &stream->wavinfo;
stepscale = (float) info->rate / shm->speed; // usually 0.5, 1, or 2
buffer->head = buffer->tail = 0;
buffer->pos = pos;
stream->pos = pos;
stream->seek (stream->file, buffer->pos * stepscale, info);
fill_buffer (sfx, stream, buffer, info, pos);
}
void
SND_StreamAdvance (sfxbuffer_t *buffer, unsigned int count)
{
float stepscale;
unsigned int headpos, samples;
sfx_t *sfx = buffer->sfx;
sfxstream_t *stream = (sfxstream_t *) sfx->data;
wavinfo_t *info = &stream->wavinfo;
stream->pos += count;
count = (stream->pos - buffer->pos) & ~255;
if (!count)
return;
stepscale = (float) info->rate / shm->speed; // usually 0.5, 1, or 2
// find out how many samples the buffer currently holds
samples = buffer->head - buffer->tail;
if (buffer->head < buffer->tail)
samples += buffer->length;
// find out where head points to in the stream
headpos = buffer->pos + samples;
if (headpos >= sfx->length) {
if (sfx->loopstart == (unsigned int)-1)
headpos = sfx->length;
else
headpos -= sfx->length - sfx->loopstart;
}
if (samples < count) {
buffer->head = buffer->tail = 0;
buffer->pos += count;
if (buffer->pos > sfx->length) {
if (sfx->loopstart == (unsigned int)-1) {
// reset the buffer and fill it incase it's needed again
buffer->pos = 0;
} else {
buffer->pos -= sfx->loopstart;
buffer->pos %= sfx->length - sfx->loopstart;
buffer->pos += sfx->loopstart;
}
stream->pos = buffer->pos;
}
headpos = buffer->pos;
stream->seek (stream->file, buffer->pos * stepscale, info);
} else {
buffer->pos += count;
if (buffer->pos >= sfx->length) {
if (sfx->loopstart == (unsigned int)-1) {
// reset the buffer and fill it incase it's needed again
headpos = buffer->pos = 0;
buffer->head = buffer->tail = 0;
count = 0;
stream->seek (stream->file, buffer->pos * stepscale, info);
} else {
buffer->pos -= sfx->length - sfx->loopstart;
}
stream->pos = buffer->pos;
}
buffer->tail += count;
if (buffer->tail >= buffer->length)
buffer->tail -= buffer->length;
}
fill_buffer (sfx, stream, buffer, info, headpos);
}
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;
sfx->close = snd_noop;
sfx->open = snd_open;
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
#ifdef HAVE_WILDMIDI
if (strnequal ("MThd", buf, 4)) {
Sys_DPrintf ("SND_Load: midi file\n");
SND_LoadMidi (file, sfx, realname);
return;
}
#endif
if (strnequal ("RIFF", buf, 4)) {
Sys_DPrintf ("SND_Load: wav file\n");
SND_LoadWav (file, sfx, realname);
return;
}
Qclose (file);
free (realname);
}
sfxbuffer_t *
SND_GetCache (long samples, int rate, int inwidth, int channels,
sfxblock_t *block, cache_allocator_t allocator)
{
int len, 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
len = size = samples / stepscale;
//printf ("%ld %d\n", samples, size);
size *= width * channels;
sc = allocator (&block->cache, sizeof (sfxbuffer_t) + size, sfx->name);
if (!sc)
return 0;
memset (sc, 0, sizeof (sfxbuffer_t) + size);
sc->length = len;
memcpy (sc->data + size, "\xde\xad\xbe\xef", 4);
return sc;
}
void
SND_ResampleMono (sfxbuffer_t *sc, byte *data, int length, void *prev)
{
byte *ib, *ob, *pb;
int fracstep, outcount, sample, samplefrac, srcsample, i;
float stepscale;
short *is, *os, *ps;
wavinfo_t *info = sc->sfx->wavinfo (sc->sfx);
int inwidth = info->width;
int inrate = info->rate;
int outwidth;
short zero_s[1];
byte zero_b[1];
is = (short *) data;
os = (short *) sc->data;
ib = data;
ob = sc->data;
ps = zero_s;
pb = zero_b;
if (!prev) {
zero_s[0] = 0;
zero_b[0] = 128;
}
os += sc->head;
ob += sc->head;
stepscale = (float) inrate / shm->speed; // usually 0.5, 1, or 2
outcount = length / stepscale;
//printf ("%d %d\n", length, outcount);
sc->sfx->length = info->samples / stepscale;
if (info->loopstart != (unsigned int)-1)
sc->sfx->loopstart = info->loopstart / stepscale;
else
sc->sfx->loopstart = (unsigned int)-1;
if (snd_loadas8bit->int_val) {
sc->bps = outwidth = 1;
sc->paint = SND_PaintChannelFrom8;
if (prev) {
zero_s[0] = ((char *)prev)[0];
zero_b[0] = ((char *)prev)[0] + 128;
}
} else {
sc->bps = outwidth = 2;
sc->paint = SND_PaintChannelFrom16;
if (prev) {
zero_s[0] = ((short *)prev)[0];
zero_b[0] = (((short *)prev)[0] >> 8) + 128;
}
}
if (!length)
return;
// 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) {
s1 = LittleShort (*ps);
s2 = LittleShort (*is);
ps = is++;
} else {
s1 = (*pb - 128) << 8;
s2 = (*ib - 128) << 8;
pb = 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;
}
}
}
{
byte *x = sc->data + sc->length * outwidth;
if (memcmp (x, "\xde\xad\xbe\xef", 4))
Sys_Error ("SND_ResampleMono screwed the pooch %02x%02x%02x%02x",
x[0], x[1], x[2], x[3]);
}
}
void
SND_ResampleStereo (sfxbuffer_t *sc, byte *data, int length, void *prev)
{
int fracstep, outcount, sl, sr, samplefrac, srcsample, i;
float stepscale;
stereo8_t *ib, *ob, *pb;
stereo16_t *is, *os, *ps;
wavinfo_t *info = sc->sfx->wavinfo (sc->sfx);
int inwidth = info->width;
int inrate = info->rate;
int outwidth;
stereo16_t zero_s;
stereo8_t zero_b;
is = (stereo16_t *) data;
os = (stereo16_t *) sc->data;
ib = (stereo8_t *) data;
ob = (stereo8_t *) sc->data;
ps = &zero_s;
pb = &zero_b;
if (!prev) {
zero_s.left = zero_s.right = 0;
zero_b.left = zero_b.right = 128;
}
os += sc->head;
ob += sc->head;
stepscale = (float) inrate / shm->speed; // usually 0.5, 1, or 2
outcount = length / stepscale;
sc->sfx->length = info->samples / stepscale;
if (info->loopstart != (unsigned int)-1)
sc->sfx->loopstart = info->loopstart / stepscale;
else
sc->sfx->loopstart = (unsigned int)-1;
if (snd_loadas8bit->int_val) {
outwidth = 1;
sc->paint = SND_PaintChannelStereo8;
sc->bps = 2;
if (prev) {
zero_s.left = ((char *)prev)[0];
zero_s.right = ((char *)prev)[1];
zero_b.left = ((char *)prev)[0] + 128;
zero_b.right = ((char *)prev)[1] + 128;
}
} else {
outwidth = 2;
sc->paint = SND_PaintChannelStereo16;
sc->bps = 4;
if (prev) {
zero_s.left = ((short *)prev)[0];
zero_s.right = ((short *)prev)[1];
zero_b.left = (((short *)prev)[0] >> 8) + 128;
zero_b.right = (((short *)prev)[1] >> 8) + 128;
}
}
if (!length)
return;
// 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) {
sl1 = LittleShort (ps->left);
sr1 = LittleShort (ps->right);
sl2 = LittleShort (is->left);
sr2 = LittleShort (is->right);
ps = is++;
} else {
sl1 = (pb->left - 128) << 8;
sr1 = (pb->right - 128) << 8;
sl2 = (ib->left - 128) << 8;
sr2 = (ib->right - 128) << 8;
pb = 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;
}
}
}
}
{
byte *x = sc->data + sc->length * outwidth * 2;
if (memcmp (x, "\xde\xad\xbe\xef", 4))
Sys_Error ("SND_ResampleStereo screwed the pooch %02x%02x%02x%02x",
x[0], x[1], x[2], x[3]);
}
}
void
SND_NoResampleStereo (sfxbuffer_t *sc, byte *data, int length, void *prev)
{
int outcount, i;
stereo8_t *ib, *ob;
stereo16_t *is, *os;
wavinfo_t *info = sc->sfx->wavinfo (sc->sfx);
int inwidth = info->width;
int outwidth;
is = (stereo16_t *) data;
os = (stereo16_t *) sc->data;
ib = (stereo8_t *) data;
ob = (stereo8_t *) sc->data;
os += sc->head;
ob += sc->head;
outcount = length;
sc->sfx->length = info->samples;
if (info->loopstart != (unsigned int)-1)
sc->sfx->loopstart = info->loopstart;
else
sc->sfx->loopstart = (unsigned int)-1;
if (snd_loadas8bit->int_val) {
outwidth = 1;
sc->paint = SND_PaintChannelStereo8;
sc->bps = 2;
} else {
outwidth = 2;
sc->paint = SND_PaintChannelStereo16;
sc->bps = 4;
}
if (!length)
return;
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);
}
}
{
byte *x = sc->data + sc->length * outwidth * 2;
if (memcmp (x, "\xde\xad\xbe\xef", 4))
Sys_Error ("SND_ResampleStereo screwed the pooch %02x%02x%02x%02x",
x[0], x[1], x[2], x[3]);
}
}
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