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/*
* vag2wav
*
* Converts a PlayStation VAG sound file to a WAV file
*
* Based on VAG-Depack 0.1 by bITmASTER
*/
#include <stdio.h>
#include <string.h>
#include "endian.c"
double f[5][2] = { { 0.0, 0.0 },
{ 60.0 / 64.0, 0.0 },
{ 115.0 / 64.0, -52.0 / 64.0 },
{ 98.0 / 64.0, -55.0 / 64.0 },
{ 122.0 / 64.0, -60.0 / 64.0 } };
double samples[28];
int main( int argc, char *argv[] )
{
FILE *vag, *pcm;
char vag_name[17];
int predict_nr, shift_factor, flags;
int i;
int d, s;
static double s_1 = 0.0;
static double s_2 = 0.0;
int sz;
unsigned int samp_freq;
unsigned int data_size;
if(argc < 3)
{
printf("vag2wav - Convert a PlayStation VAG sound file to a WAV file\n");
printf("usage: vag2wav [vag] [wav file]\n");
printf("\n");
printf("This utility is based on PSX VAG-Depack by bITmASTER\n");
return( -1 );
}
vag = fopen( argv[1], "rb" );
fread(vag_name, sizeof(char), 4, vag);
if(vag == NULL)
{
printf("Can't open %s. Aborting.\n", argv[1]);
return -1;
}
if(strncmp(vag_name, "VAGp", 4))
{
printf("%s is not in VAG format. Aborting.\n", argv[1]);
return -1;
}
fseek(vag, 4, SEEK_SET);
i = fgetc(vag) << 24;
i |= fgetc(vag) << 16;
i |= fgetc(vag) << 8;
i |= fgetc(vag);
printf("Version: %x\n", i);
fseek(vag, 12, SEEK_SET);
data_size = fgetc(vag) << 24;
data_size |= fgetc(vag) << 16;
data_size |= fgetc(vag) << 8;
data_size |= fgetc(vag);
printf("Data size: %d bytes\n", data_size);
fseek(vag, 32, SEEK_SET);
fread(vag_name, sizeof(char), 16, vag);
vag_name[16] = 0;
printf("Name: %s\n", vag_name);
fseek(vag, 16, SEEK_SET);
samp_freq = fgetc(vag)<<24;
samp_freq|=fgetc(vag)<<16;
samp_freq|=fgetc(vag)<<8;
samp_freq|=fgetc(vag);
printf("Sampling frequency: %d\n", samp_freq);
fseek( vag, 64, SEEK_SET );
/* strcpy( fname, argv[1] );
p = strrchr( fname, '.' );
p++;
strcpy( p, "PCM" );*/
pcm = fopen( argv[2], "wb" );
if ( pcm == NULL ) {
printf( "can't write output file\n" );
return( -8 );
}
// Write header chunk
fprintf(pcm, "RIFF");
// Skip file size field for now
fseek(pcm, 4, SEEK_CUR);
fprintf(pcm, "WAVE");
// Write fmt chunk
fprintf(pcm, "fmt ");
// Write chunk 1 size in little endian format
fputc(0x10, pcm);
fputc(0, pcm);
fputc(0, pcm);
fputc(0, pcm);
// Write audio format (1 = PCM)
fputc(1, pcm);
fputc(0, pcm);
// Number of channels (1)
fputc(1, pcm);
fputc(0, pcm);
// Write sample rate
fputc((samp_freq & 0xff), pcm);
fputc((samp_freq >> 8) & 0xff, pcm);
fputc(0, pcm);
fputc(0, pcm);
// Write byte rate (SampleRate * NumChannels * BitsPerSample/8)
// That would be 44100*1*(16/8), thus 88200.
fputc(((samp_freq*2) & 0xff), pcm);
fputc(((samp_freq*2) >> 8) & 0xff, pcm);
fputc(((samp_freq*2) >> 16) & 0xff, pcm);
fputc(((samp_freq*2) >> 24) & 0xff, pcm);
// Write block align (NumChannels * BitsPerSample/8), thus 2
fputc(2, pcm);
fputc(0, pcm);
// Write BitsPerSample
fputc(16, pcm);
fputc(0, pcm);
// Write data chunk
fprintf(pcm, "data");
// Skip SubChunk2Size, we will return to it later
fseek(pcm, 4, SEEK_CUR);
// Now write data...
while( ftell(vag) < (data_size+48)) {
predict_nr = fgetc( vag );
shift_factor = predict_nr & 0xf;
predict_nr >>= 4;
flags = fgetc( vag ); // flags
if ( flags == 7 )
break;
for ( i = 0; i < 28; i += 2 ) {
d = fgetc( vag );
s = ( d & 0xf ) << 12;
if ( s & 0x8000 )
s |= 0xffff0000;
samples[i] = (double) ( s >> shift_factor );
s = ( d & 0xf0 ) << 8;
if ( s & 0x8000 )
s |= 0xffff0000;
samples[i+1] = (double) ( s >> shift_factor );
}
for ( i = 0; i < 28; i++ ) {
samples[i] = samples[i] + s_1 * f[predict_nr][0] + s_2 * f[predict_nr][1];
s_2 = s_1;
s_1 = samples[i];
d = (int) ( samples[i] + 0.5 );
fputc( d & 0xff, pcm );
fputc( d >> 8, pcm );
}
}
// Get file size
sz = ftell(pcm);
// Now write ChunkSize
fseek(pcm, 4, SEEK_SET);
fputc((sz-8) & 0xff, pcm);
fputc(((sz-8)>>8)&0xff, pcm);
fputc(((sz-8)>>16)&0xff,pcm);
fputc(((sz-8)>>24)&0xff,pcm);
// Now write Subchunk2Size
fseek(pcm, 40, SEEK_SET);
fputc((sz-44) & 0xff, pcm);
fputc(((sz-44)>>8)&0xff, pcm);
fputc(((sz-44)>>16)&0xff,pcm);
fputc(((sz-44)>>24)&0xff,pcm);
fclose( pcm );
fclose( vag );
return( 0 );
}
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