ref: c1ca587d473ef465be3865c6d78885b25efe8de3
dir: /tools/wav_io.c/
/* Copyright (C) 2002 Jean-Marc Valin
File: wav_io.c
Routines to handle wav (RIFF) headers
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
- Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
- Neither the name of the Xiph.org Foundation nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <string.h>
#include "celt_types.h"
#include "wav_io.h"
int read_wav_header(FILE *file, int *rate, int *channels, int *format, celt_int32 *size)
{
char ch[5];
celt_int32 itmp;
celt_int16 stmp;
celt_int32 bpersec;
celt_int16 balign;
int skip_bytes;
int i;
ch[4]=0;
#if 0
fread(ch, 1, 4, file);
if (strcmp(ch, "RIFF")!=0)
{
fseek(file, 0, SEEK_SET);
return 0;
}
fread(&itmp, 4, 1, file);
*size = le_int(itmp-36);
fread(ch, 1, 4, file);
if (strcmp(ch, "WAVE")!=0)
{
fprintf (stderr, "RIFF file is not a WAVE file\n");
return -1;
}
#endif
fread(ch, 1, 4, file);
while (strcmp(ch, "fmt ")!=0)
{
fread(&itmp, 4, 1, file);
itmp = le_int(itmp);
/*fprintf (stderr, "skip=%d\n", itmp);*/
/*strange way of seeking, but it works even for pipes*/
for (i=0;i<itmp;i++)
fgetc(file);
/*fseek(file, itmp, SEEK_CUR);*/
fread(ch, 1, 4, file);
if (feof(file))
{
fprintf (stderr, "Corrupted WAVE file: no \"fmt \"\n");
return -1;
}
}
/*if (strcmp(ch, "fmt ")!=0)
{
fprintf (stderr, "Corrupted WAVE file: no \"fmt \"\n");
return -1;
}*/
fread(&itmp, 4, 1, file);
itmp = le_int(itmp);
skip_bytes=itmp-16;
/*fprintf (stderr, "skip=%d\n", skip_bytes);*/
fread(&stmp, 2, 1, file);
stmp = le_short(stmp);
if (stmp!=1)
{
fprintf (stderr, "Only PCM encoding is supported\n");
return -1;
}
fread(&stmp, 2, 1, file);
stmp = le_short(stmp);
*channels = stmp;
if (stmp>2)
{
fprintf (stderr, "Only mono and (intensity) stereo supported\n");
return -1;
}
fread(&itmp, 4, 1, file);
itmp = le_int(itmp);
*rate = itmp;
fread(&itmp, 4, 1, file);
bpersec = le_int(itmp);
fread(&stmp, 2, 1, file);
balign = le_short(stmp);
fread(&stmp, 2, 1, file);
stmp = le_short(stmp);
if (stmp!=16 && stmp!=8)
{
fprintf (stderr, "Only 8/16-bit linear supported\n");
return -1;
}
*format=stmp;
if (bpersec!=*rate**channels*stmp/8)
{
fprintf (stderr, "Corrupted header: ByteRate mismatch\n");
return -1;
}
if (balign!=*channels*stmp/8)
{
fprintf (stderr, "Corrupted header: BlockAlign mismatch\n");
return -1;
}
/*strange way of seeking, but it works even for pipes*/
if (skip_bytes>0)
for (i=0;i<skip_bytes;i++)
fgetc(file);
/*fseek(file, skip_bytes, SEEK_CUR);*/
fread(ch, 1, 4, file);
while (strcmp(ch, "data")!=0)
{
fread(&itmp, 4, 1, file);
itmp = le_int(itmp);
/*strange way of seeking, but it works even for pipes*/
for (i=0;i<itmp;i++)
fgetc(file);
/*fseek(file, itmp, SEEK_CUR);*/
fread(ch, 1, 4, file);
if (feof(file))
{
fprintf (stderr, "Corrupted WAVE file: no \"data\"\n");
return -1;
}
}
/*Ignore this for now*/
fread(&itmp, 4, 1, file);
itmp = le_int(itmp);
*size=itmp;
return 1;
}
void write_wav_header(FILE *file, int rate, int channels, int format, int size)
{
char ch[5];
celt_int32 itmp;
celt_int16 stmp;
ch[4]=0;
fprintf (file, "RIFF");
itmp = 0x7fffffff;
fwrite(&itmp, 4, 1, file);
fprintf (file, "WAVEfmt ");
itmp = le_int(16);
fwrite(&itmp, 4, 1, file);
stmp = le_short(1);
fwrite(&stmp, 2, 1, file);
stmp = le_short(channels);
fwrite(&stmp, 2, 1, file);
itmp = le_int(rate);
fwrite(&itmp, 4, 1, file);
itmp = le_int(rate*channels*2);
fwrite(&itmp, 4, 1, file);
stmp = le_short(2*channels);
fwrite(&stmp, 2, 1, file);
stmp = le_short(16);
fwrite(&stmp, 2, 1, file);
fprintf (file, "data");
itmp = le_int(0x7fffffff);
fwrite(&itmp, 4, 1, file);
}