ref: 4774410d15c4ea4cb2eab4259cf6aa462cc2858c
dir: /src/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.
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 "wav_io.h"
#include "opus_header.h"
/* Adjust the stream->channel mapping to ensure the proper output order for
WAV files. */
void adjust_wav_mapping(int mapping_family, int channels, unsigned char *stream_map)
{
unsigned char new_stream_map[8];
int i;
/* If we aren't using one of the defined semantic channel maps, or we have
more channels than we know what to do with, use a default 1-1 mapping. */
if(mapping_family != 1 || channels > 8)
return;
for(i = 0; i < channels; i++)
{
new_stream_map[wav_permute_matrix[channels-1][i]] = stream_map[i];
}
memcpy(stream_map, new_stream_map, channels*sizeof(*stream_map));
}
static size_t fwrite_le32(opus_int32 i32, FILE *file)
{
unsigned char buf[4];
buf[0]=(unsigned char)(i32&0xFF);
buf[1]=(unsigned char)(i32>>8&0xFF);
buf[2]=(unsigned char)(i32>>16&0xFF);
buf[3]=(unsigned char)(i32>>24&0xFF);
return fwrite(buf,4,1,file);
}
static size_t fwrite_le16(int i16, FILE *file)
{
unsigned char buf[2];
buf[0]=(unsigned char)(i16&0xFF);
buf[1]=(unsigned char)(i16>>8&0xFF);
return fwrite(buf,2,1,file);
}
int write_wav_header(FILE *file, int rate, int mapping_family, int channels)
{
int ret;
int extensible;
/* Multichannel files require a WAVEFORMATEXTENSIBLE header to declare the
proper channel meanings. */
extensible = mapping_family == 1 && 3 <= channels && channels <= 8;
ret = fprintf (file, "RIFF") >= 0;
ret &= fwrite_le32 (0x7fffffff, file);
ret &= fprintf (file, "WAVEfmt ") >= 0;
ret &= fwrite_le32 (extensible ? 40 : 16, file);
ret &= fwrite_le16 (extensible ? 0xfffe : 1, file);
ret &= fwrite_le16 (channels, file);
ret &= fwrite_le32 (rate, file);
ret &= fwrite_le32 (2*channels*rate, file);
ret &= fwrite_le16 (2*channels, file);
ret &= fwrite_le16 (16, file);
if(extensible)
{
static const unsigned char ksdataformat_subtype_pcm[16]=
{
0x01, 0x00, 0x00, 0x00,
0x00, 0x00,
0x10, 0x00,
0x80, 0x00,
0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71
};
static const int wav_channel_masks[8] =
{
1, /* 1.0 mono */
1|2, /* 2.0 stereo */
1|2|4, /* 3.0 channel ('wide') stereo */
1|2|16|32, /* 4.0 discrete quadrophonic */
1|2|4|16|32, /* 5.0 */
1|2|4|8|16|32, /* 5.1 */
1|2|4|8|256|512|1024, /* 6.1 */
1|2|4|8|16|32|512|1024, /* 7.1 */
};
ret &= fwrite_le16 (22, file);
ret &= fwrite_le16 (16, file);
ret &= fwrite_le32 (wav_channel_masks[channels-1], file);
ret &= fwrite (ksdataformat_subtype_pcm, 16, 1, file);
}
ret &= fprintf (file, "data") >= 0;
ret &= fwrite_le32 (0x7fffffff, file);
return !ret ? -1 : extensible ? 40 : 16;
}