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