quakeforge/libs/audio/renderer/wav.c

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/*
wav.c
wav file loading
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
#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#include <stdlib.h>
#include "QF/cvar.h"
#include "QF/sound.h"
#include "QF/sys.h"
#include "QF/qendian.h"
#include "QF/quakefs.h"
#include "QF/riff.h"
#include "snd_internal.h"
#define FRAMES 1024
typedef struct {
float *data;
QFile *file;
} wav_file_t;
static void
wav_callback_load (void *object, cache_allocator_t allocator)
{
sfxblock_t *block = (sfxblock_t *) object;
sfx_t *sfx = block->sfx;
const char *name = (const char *) block->file;
QFile *file;
int len;
byte *data;
float *fdata;
sfxbuffer_t *buffer;
wavinfo_t *info = &block->wavinfo;
QFS_FOpenFile (name, &file);
if (!file)
return; //FIXME Sys_Error?
Qseek (file, info->dataofs, SEEK_SET);
len = info->datalen + info->frames * info->channels * sizeof (float);
data = malloc (len);
fdata = (float *) (data + info->datalen);
Qread (file, data, info->datalen);
Qclose (file);
SND_Convert (data, fdata, info->frames, info->channels, info->width);
buffer = SND_GetCache (info->frames, info->rate,
info->channels, block, allocator);
buffer->sfx = sfx;
SND_SetPaint (buffer);
SND_SetupResampler (buffer, 0);
SND_Resample (buffer, fdata, info->frames);
buffer->head = buffer->length;
free (data);
}
static void
wav_cache (sfx_t *sfx, char *realname, void *file, wavinfo_t info)
{
Qclose (file);
SND_SFX_Cache (sfx, realname, info, wav_callback_load);
}
static long
wav_stream_read (void *file, float **buf)
{
sfxstream_t *stream = (sfxstream_t *) file;
wavinfo_t *info = &stream->wavinfo;
wav_file_t *wf = (wav_file_t *) stream->file;
int res;
int len = FRAMES * info->channels * info->width;
byte *data = alloca (len);
if (!wf->data)
wf->data = malloc (FRAMES * info->channels * sizeof (float));
res = Qread (wf->file, data, len);
if (res <= 0) {
stream->error = 1;
return 0;
}
res /= (info->channels * info->width);
SND_Convert (data, wf->data, res, info->channels, info->width);
*buf = wf->data;
return res;
}
static int
wav_stream_seek (sfxstream_t *stream, int pos)
{
wavinfo_t *info = &stream->wavinfo;
wav_file_t *wf = (wav_file_t *) stream->file;
pos *= info->width * info->channels;
pos += info->dataofs;
return Qseek (wf->file, pos, SEEK_SET);
}
static void
wav_stream_close (sfx_t *sfx)
{
sfxstream_t *stream = sfx->data.stream;
wav_file_t *wf = (wav_file_t *) stream->file;
Qclose (wf->file);
if (wf->data)
free (wf->data);
free (wf);
SND_SFX_StreamClose (sfx);
}
static sfx_t *
wav_stream_open (sfx_t *sfx)
{
sfxstream_t *stream = sfx->data.stream;
QFile *file;
wav_file_t *wf;
QFS_FOpenFile (stream->file, &file);
if (!file)
return 0;
wf = calloc (sizeof (wav_file_t), 1);
wf->file = file;
return SND_SFX_StreamOpen (sfx, wf, wav_stream_read, wav_stream_seek,
wav_stream_close);
}
static void
wav_stream (sfx_t *sfx, char *realname, void *file, wavinfo_t info)
{
Qclose (file);
SND_SFX_Stream (sfx, realname, info, wav_stream_open);
}
static wavinfo_t
wav_get_info (QFile *file)
{
riff_t *riff;
riff_d_chunk_t **ck;
riff_format_t *fmt;
riff_d_format_t *dfmt = 0;
riff_data_t *data = 0;
riff_cue_t *cue;
riff_d_cue_t *dcue;
riff_d_cue_point_t *cp = 0;
riff_list_t *list;
riff_d_chunk_t **lck;
riff_ltxt_t *ltxt;
riff_d_ltxt_t *dltxt = 0;
wavinfo_t info;
memset (&info, 0, sizeof (info));
if (!(riff = riff_read (file))) {
Sys_Printf ("bad riff file\n");
return info;
}
for (ck = riff->chunks; *ck; ck++) {
RIFF_SWITCH ((*ck)->name) {
case RIFF_CASE ('f','m','t',' '):
fmt = (riff_format_t *) *ck;
dfmt = (riff_d_format_t *) fmt->fdata;
break;
case RIFF_CASE ('d','a','t','a'):
data = (riff_data_t *) *ck;
break;
case RIFF_CASE ('c','u','e',' '):
cue = (riff_cue_t *) *ck;
dcue = cue->cue;
if (dcue->count)
cp = &dcue->cue_points[dcue->count - 1];
break;
case RIFF_CASE ('L','I','S','T'):
list = (riff_list_t *) *ck;
RIFF_SWITCH (list->name) {
case RIFF_CASE ('a','d','t','l'):
for (lck = list->chunks; *lck; lck++) {
RIFF_SWITCH ((*lck)->name) {
case RIFF_CASE ('l','t','x','t'):
ltxt = (riff_ltxt_t *) *lck;
dltxt = &ltxt->ltxt;
break;
}
}
break;
}
break;
}
}
if (!dfmt) {
Sys_Printf ("missing format chunk\n");
goto bail;
}
if (dfmt->format_tag != 1) {
Sys_Printf ("not Microsoft PCM\n");
goto bail;
}
if (dfmt->channels < 1 || dfmt->channels > 8) {
Sys_Printf ("unsupported channel count\n");
goto bail;
}
if (!data) {
Sys_Printf ("missing data chunk\n");
goto bail;
}
info.rate = dfmt->samples_per_sec;
info.width = dfmt->bits_per_sample / 8;
info.channels = dfmt->channels;
info.frames = 0;
if (cp) {
info.loopstart = cp->sample_offset;
if (dltxt)
info.frames = info.loopstart + dltxt->len;
} else {
info.loopstart = -1;
}
if (!info.frames)
info.frames = data->ck.len / (info.width * info.channels);
info.dataofs = *(int *)data->data;
info.datalen = data->ck.len;
bail:
riff_free (riff);
return info;
}
int
SND_LoadWav (QFile *file, sfx_t *sfx, char *realname)
{
wavinfo_t info;
info = wav_get_info (file);
if (!info.rate) {
return -1;
}
if (info.frames / info.rate < 3) {
Sys_MaskPrintf (SYS_DEV, "cache %s\n", realname);
wav_cache (sfx, realname, file, info);
} else {
Sys_MaskPrintf (SYS_DEV, "stream %s\n", realname);
wav_stream (sfx, realname, file, info);
}
return 0;
}