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newtree/source/snd_mem.c
Bill Currie eae11661e4 strncat parameter audit. Unfortunatly, strncat is counter-intutite: the n in 
strncat is not the maximum length of the destination string, but of the SOURCE
string, thus strncat (dest, src, sizeof (dest)) is incorrect. It should be
strncat (dest, src, sizeof (text) - strlen (dest)). Even then, no terminating
nul will be written if src is too long, but at least it won't crash the stack:)
2000-12-05 16:04:12 +00:00

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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
#include <string.h>
#include "sys.h"
#include "sound.h"
#include "qendian.h"
#include "quakefs.h"
#include "console.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%x : %s (%d)\n", (int)(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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