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newtree/source/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
$Id$
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#include "console.h"
#include "qendian.h"
#include "quakefs.h"
#include "sound.h"
#include "sys.h"
int cache_full_cycle;
byte *S_Alloc (int size);
/*
ResampleSfx
*/
void
ResampleSfx (sfx_t *sfx, int inrate, int inwidth, byte * data)
{
int outcount;
int srcsample;
float stepscale;
int i;
int sample, samplefrac, fracstep;
sfxcache_t *sc;
short *is, *os;
unsigned char *ib, *ob;
sc = Cache_Check (&sfx->cache);
if (!sc)
return;
is = (short *) data;
os = (short *) sc->data;
ib = data;
ob = sc->data;
stepscale = (float) inrate / shm->speed; // this is usually 0.5, 1, or
// 2
outcount = sc->length / stepscale;
sc->speed = shm->speed;
if (loadas8bit->int_val)
sc->width = 1;
else
sc->width = 2;
sc->stereo = 0;
// resample / decimate to the current source rate
if (stepscale == 1) {
if (inwidth == 1 && sc->width == 1) {
for (i = 0; i < outcount; i++) {
*ob++ = *ib++ - 128;
}
} else if (inwidth == 1 && sc->width == 2) {
for (i = 0; i < outcount; i++) {
*os++ = (*ib++ - 128) << 8;
}
} else if (inwidth == 2 && sc->width == 1) {
for (i = 0; i < outcount; i++) {
*ob++ = LittleShort (*is++) >> 8;
}
} else if (inwidth == 2 && sc->width == 2) {
for (i = 0; i < outcount; i++) {
*os++ = LittleShort (*is++);
}
}
} else {
// general case
if (snd_interp->int_val && stepscale < 1) {
int points = 1 / stepscale;
int j;
for (i = 0; i < sc->length; i++) {
int s1, s2;
if (inwidth == 2) {
s2 = s1 = LittleShort (is[0]);
if (i < sc->length - 1)
s2 = LittleShort (is[1]);
is++;
} else {
s2 = s1 = (ib[0] - 128) << 8;
if (i < sc->length - 1)
s2 = (ib[1] - 128) << 8;
ib++;
}
for (j = 0; j < points; j++) {
sample = s1 + (s2 - s1) * ((float) j) / points;
if (sc->width == 2) {
os[j] = sample;
} else {
ob[j] = sample >> 8;
}
}
if (sc->width == 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 (((short *) data)[srcsample]);
else
sample =
(int) ((unsigned char) (data[srcsample]) - 128) << 8;
if (sc->width == 2)
((short *) sc->data)[i] = sample;
else
((signed char *) sc->data)[i] = sample >> 8;
}
}
}
sc->length = outcount;
if (sc->loopstart != -1)
sc->loopstart = sc->loopstart / stepscale;
}
//=============================================================================
/*
S_LoadSound
*/
sfxcache_t *
S_LoadSound (sfx_t *s)
{
char namebuffer[256];
byte *data;
wavinfo_t info;
int len;
float stepscale;
sfxcache_t *sc;
byte stackbuf[1 * 1024]; // avoid dirtying the cache heap
// see if still in memory
sc = Cache_Check (&s->cache);
if (sc)
return sc;
//Con_Printf ("S_LoadSound: %x\n", (int)stackbuf);
// load it in
strcpy (namebuffer, "sound/");
strncat (namebuffer, s->name, sizeof (namebuffer) - strlen (namebuffer));
// Con_Printf ("loading %s\n",namebuffer);
data = COM_LoadStackFile (namebuffer, stackbuf, sizeof (stackbuf));
if (!data) {
Con_Printf ("Couldn't load %s\n", namebuffer);
return NULL;
}
info = GetWavinfo (s->name, data, com_filesize);
if (info.channels != 1) {
Con_Printf ("%s is a stereo sample\n", s->name);
return NULL;
}
stepscale = (float) info.rate / shm->speed;
len = info.samples / stepscale;
if (loadas8bit->int_val) {
len = len * info.channels;
} else {
len = len * 2 * info.channels;
}
sc = Cache_Alloc (&s->cache, len + sizeof (sfxcache_t), s->name);
if (!sc)
return NULL;
sc->length = info.samples;
sc->loopstart = info.loopstart;
sc->speed = info.rate;
sc->width = info.width;
sc->stereo = info.channels;
ResampleSfx (s, sc->speed, sc->width, data + info.dataofs);
return sc;
}
/*
WAV loading
*/
byte *data_p;
byte *iff_end;
byte *last_chunk;
byte *iff_data;
int iff_chunk_len;
short
GetLittleShort (void)
{
short val = 0;
val = *data_p;
val = val + (*(data_p + 1) << 8);
data_p += 2;
return val;
}
int
GetLittleLong (void)
{
int val = 0;
val = *data_p;
val = val + (*(data_p + 1) << 8);
val = val + (*(data_p + 2) << 16);
val = val + (*(data_p + 3) << 24);
data_p += 4;
return val;
}
void
FindNextChunk (char *name)
{
while (1) {
data_p = last_chunk;
if (data_p >= iff_end) { // didn't find the chunk
data_p = NULL;
return;
}
data_p += 4;
iff_chunk_len = GetLittleLong ();
if (iff_chunk_len < 0) {
data_p = NULL;
return;
}
// if (iff_chunk_len > 1024*1024)
// Sys_Error ("FindNextChunk: %i length is past the 1 meg sanity limit", iff_chunk_len);
data_p -= 8;
last_chunk = data_p + 8 + ((iff_chunk_len + 1) & ~1);
if (!strncmp (data_p, name, 4))
return;
}
}
void
FindChunk (char *name)
{
last_chunk = iff_data;
FindNextChunk (name);
}
void
DumpChunks (void)
{
char str[5];
str[4] = 0;
data_p = iff_data;
do {
memcpy (str, data_p, 4);
data_p += 4;
iff_chunk_len = GetLittleLong ();
Con_Printf ("0x%p : %s (%d)\n", (data_p - 4), str, iff_chunk_len);
data_p += (iff_chunk_len + 1) & ~1;
} while (data_p < iff_end);
}
/*
GetWavinfo
*/
wavinfo_t
GetWavinfo (char *name, byte * wav, int wavlength)
{
wavinfo_t info;
int i;
int format;
int samples;
memset (&info, 0, sizeof (info));
if (!wav)
return info;
iff_data = wav;
iff_end = wav + wavlength;
// find "RIFF" chunk
FindChunk ("RIFF");
if (!(data_p && !strncmp (data_p + 8, "WAVE", 4))) {
Con_Printf ("Missing RIFF/WAVE chunks\n");
return info;
}
// get "fmt " chunk
iff_data = data_p + 12;
// DumpChunks ();
FindChunk ("fmt ");
if (!data_p) {
Con_Printf ("Missing fmt chunk\n");
return info;
}
data_p += 8;
format = GetLittleShort ();
if (format != 1) {
Con_Printf ("Microsoft PCM format only\n");
return info;
}
info.channels = GetLittleShort ();
info.rate = GetLittleLong ();
data_p += 4 + 2;
info.width = GetLittleShort () / 8;
// get cue chunk
FindChunk ("cue ");
if (data_p) {
data_p += 32;
info.loopstart = GetLittleLong ();
// Con_Printf("loopstart=%d\n", sfx->loopstart);
// if the next chunk is a LIST chunk, look for a cue length marker
FindNextChunk ("LIST");
if (data_p) {
if (!strncmp (data_p + 28, "mark", 4)) { // this is not a
// proper parse, but
// it works with
// cooledit...
data_p += 24;
i = GetLittleLong (); // samples in loop
info.samples = info.loopstart + i;
// Con_Printf("looped length: %i\n", i);
}
}
} else
info.loopstart = -1;
// find data chunk
FindChunk ("data");
if (!data_p) {
Con_Printf ("Missing data chunk\n");
return info;
}
data_p += 4;
samples = GetLittleLong () / info.width;
if (info.samples) {
if (samples < info.samples)
Sys_Error ("Sound %s has a bad loop length", name);
} else
info.samples = samples;
info.dataofs = data_p - wav;
return info;
}
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