mirror of
https://github.com/ZDoom/gzdoom-gles.git
synced 2024-11-07 05:21:18 +00:00
84 lines
2.2 KiB
C
84 lines
2.2 KiB
C
|
/* Trims silence off beginning of SPC file.
|
||
|
|
Requires the accurate DSP; won't compile with the fast DSP.
|
||
|
|
Please note that the algorithm could be improved; this is just
|
||
|
|
a simple example showing the idea.
|
||
|
|
|
||
|
|
Usage: trim_spc [test.spc [trimmed.spc]]
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "snes_spc/spc.h"
|
||
|
|
|
||
|
|
#include "demo_util.h" /* error(), load_file() */
|
||
|
|
|
||
|
|
/* Change to 1 to have it trim to next key on event rather than trim silence */
|
||
|
|
enum { use_kon_check = 0 };
|
||
|
|
|
||
|
|
/* True if all count samples from in are silent (or very close to it) */
|
||
|
|
int is_silent( short const* in, int count );
|
||
|
|
|
||
|
|
int main( int argc, char** argv )
|
||
|
|
{
|
||
|
|
/* Load file into memory */
|
||
|
|
long spc_size;
|
||
|
|
void* spc = load_file( (argc > 1) ? argv [1] : "test.spc", &spc_size );
|
||
|
|
|
||
|
|
/* Load into emulator */
|
||
|
|
SNES_SPC* snes_spc = spc_new();
|
||
|
|
if ( !snes_spc ) error( "Out of memory" );
|
||
|
|
error( spc_load_spc( snes_spc, spc, spc_size ) );
|
||
|
|
|
||
|
|
/* Expand SPC data so there's enough room for emulator to save to.
|
||
|
|
We simply overwrite the emulator data in the old SPC file rather
|
||
|
|
than creating new SPC data. This preserves the text tags from
|
||
|
|
the old file. */
|
||
|
|
if ( spc_size < spc_file_size )
|
||
|
|
{
|
||
|
|
spc_size = spc_file_size;
|
||
|
|
spc = realloc( spc, spc_size ); /* leaks memory if allocation fails */
|
||
|
|
if ( !spc ) error( "Out of memory" );
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Keep saving SPC, then playing a little more. Once SPC becomes non-silent,
|
||
|
|
write the SPC data saved just before this. */
|
||
|
|
{
|
||
|
|
long samples_trimmed = 0;
|
||
|
|
while ( 1 )
|
||
|
|
{
|
||
|
|
#define BUF_SIZE 1024
|
||
|
|
short buf [BUF_SIZE];
|
||
|
|
|
||
|
|
if ( samples_trimmed > 10 * spc_sample_rate * 2 )
|
||
|
|
error( "Excess silence found" );
|
||
|
|
|
||
|
|
spc_clear_echo( snes_spc );
|
||
|
|
spc_save_spc( snes_spc, spc );
|
||
|
|
|
||
|
|
/* Fill buffer */
|
||
|
|
error( spc_play( snes_spc, BUF_SIZE, buf ) );
|
||
|
|
samples_trimmed += BUF_SIZE;
|
||
|
|
|
||
|
|
/* See if SPC became non-silent */
|
||
|
|
if ( use_kon_check ? spc_check_kon( snes_spc ) : !is_silent( buf, BUF_SIZE ) )
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
printf( "Trimmed %.1f seconds\n", (double) samples_trimmed / spc_sample_rate / 2 );
|
||
|
|
}
|
||
|
|
|
||
|
|
spc_delete( snes_spc );
|
||
|
|
write_file( (argc > 2) ? argv [2] : "trimmed.spc", spc, spc_size );
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int is_silent( short const* in, int count )
|
||
|
|
{
|
||
|
|
unsigned const threshold = 0x10;
|
||
|
|
while ( count-- )
|
||
|
|
{
|
||
|
|
if ( (unsigned) (*in++ + threshold / 2) > threshold )
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
return 1;
|
||
|
|
}
|