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/* fmfconv_wav.c: wav output routine included into fmfconv.c
Copyright (c) 2004-2005 Gergely Szasz
$Id: fmfconv_wav.c 4777 2012-11-26 23:35:48Z sbaldovi $
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 the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
Author contact information:
E-mail: szaszg@hu.inter.net
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include "libspectrum.h"
#include "fmfconv.h"
/*
Byte order: Little-endian
Offset Length Contents
0 4 bytes "RIFF"
4 4 bytes <File length - 8>
8 4 bytes "WAVE"
12 4 bytes "fmt "
16 4 bytes <Length of the fmt data> // (=16)
20 2 bytes <WAVE File Encoding Tag>
22 2 bytes <Channels> // Channels: 1 = mono, 2 = stereo
24 4 bytes <Sample rate> // Samples per second: e.g., 44100
28 4 bytes <bytes/second> // sample rate * block align
32 2 bytes <block align> // channels * bits/sample / 8
34 2 bytes <bits/sample> // 8 or 16
.................................................... PCM
36 4 bytes "data"
40 4 bytes <Sample data size(n)>
44 (n)bytes <Sample data>
..................................................... Law!!!
36 2 bytes <cbLength> // 0
38 4 bytes "fact"
42 4 bytes <Chunk size> // 4
46 4 bytes <Number of samples >
50 4 bytes "data"
54 4 bytes <Sample data size(n)>
58 (n)bytes <Sample data>
......................................................
*/
#define WAV_POS_FILELEN 4L
#define WAV_POS_PCMLEN 40L
#define WAV_POS_LAWLEN 54L
#define WAV_POS_SAMPLES 46L
int
snd_write_wavheader( void )
{
libspectrum_byte buff[4];
int tmp;
fwrite( "RIFF\377\377\377\377WAVEfmt ", 16, 1, snd );
if( snd_enc == TYPE_PCM )
fwrite( "\020\000\000\000\001\000", 6, 1, snd ); /* PCM */
else if( snd_enc == TYPE_ALW )
fwrite( "\022\000\000\000\006\000", 6, 1, snd ); /* A-Law */
else
fwrite( "\022\000\000\000\007\000", 6, 1, snd ); /* u-Law */
if( snd_chn == 2 )
fwrite( "\002\000", 2, 1, snd ); /* Stereo */
else
fwrite( "\001\000", 2, 1, snd ); /* Mono */
buff[0] = snd_rte & 0xff; buff[1] = snd_rte >> 8; buff[2] = buff[3] = 0;
fwrite( buff, 4, 1, snd ); /* sampling rate in Hz */
tmp = snd_rte * snd_fsz;
buff[0] = tmp & 0xff; buff[1] = ( tmp >> 8 ) & 0xff ; buff[2] = tmp >> 16; buff[3] = 0;
fwrite( buff, 4, 1, snd ); /* avarege byte rate */
buff[0] = snd_fsz & 0xff; buff[1] = snd_fsz >> 8; buff[2] = snd_fsz / snd_chn * 8; buff[3] = 0;
fwrite( buff, 4, 1, snd ); /* frame size + bits/sample */
if( snd_enc != TYPE_PCM )
fwrite( "\000\000fact\004\000\000\000\377\377\377\377", 14, 1, snd );/* */
fwrite( "data\377\377\377\377", 8, 1, snd );/* data Chunk header */
snd_header_ok = 1;
printi( 1, "snd_write_wavheader(): %dHz %c encoded %s\n", snd_rte, snd_enc,
snd_chn == 2 ? "stereo" : "mono" );
return 0;
}
int
snd_write_wav( void )
{
int err;
if( !snd_header_ok && ( err = snd_write_wavheader() ) ) return err;
if( snd_enc == TYPE_PCM && !snd_little_endian ) { /* we have to swap all sample */
pcm_swap_endian();
}
if( fwrite( sound8, snd_len, 1, snd ) != 1 ) return ERR_WRITE_SND;
printi( 2, "snd_write_wav(): %d samples (%d bytes) sound\n", snd_len/snd_fsz, snd_len );
return 0;
}
void
snd_finalize_wav( void )
{
libspectrum_byte buff[4];
long pos = ftell( snd );
long dsz = pos;
if( fseek( snd, WAV_POS_FILELEN, SEEK_SET ) == -1 ) {
printw( "snd_finalize_wav(): cannot finalize sound output file (not seekable).\n" );
} else {
if( pos & 1 ) {
fwrite( buff, 1, 1, snd ); /* padding byte */
pos++;
}
pos -= 8;
buff[0] = pos & 0xff; buff[1] = ( pos >> 8 ) & 0xff;
buff[2] = ( pos >> 16 ) & 0xff; buff[3] = pos >> 24;
fwrite( buff, 4, 1, snd ); /* set file length - 8 */
if( snd_enc == TYPE_PCM ) {
dsz -= 44;
fseek( snd, WAV_POS_PCMLEN, SEEK_SET );
} else {
dsz -= 58;
fseek( snd, WAV_POS_LAWLEN, SEEK_SET );
}
buff[0] = dsz & 0xff; buff[1] = ( dsz >> 8 ) & 0xff;
buff[2] = ( dsz >> 16 ) & 0xff; buff[3] = dsz >> 24;
fwrite( buff, 4, 1, snd ); /* set data size */
if( snd_enc != TYPE_PCM ) {
fseek( snd, WAV_POS_SAMPLES, SEEK_SET );
fwrite( buff, 4, 1, snd ); /* set sample num (1 byte/sample) */
}
printi( 1, "snd_finalize_wav(): RIFF size: %ldbyte DATA size: %ldbyte\n", pos, dsz );
}
}
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