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3bfcc5c09c
spc_amp from a x.4 fixed point number to a normal float. - Switched SPC playback from the external SNESAPU.DLL to Blargg's LGPL snes_spc library. I've compiled it with the fast DSP rather than the highly accurate one, since I didn't notice a meaningful difference between the two in my limited testing. In short: SPC playback is now built in to ZDoom. You don't need to download anything extra to make it work, and it also works on Linux as well as Windows (though building with Linux is currently untested). - Fixed: Stereo separation was calculated very wrongly when in 2D sound mode. SVN r794 (trunk)
83 lines
2.2 KiB
C
83 lines
2.2 KiB
C
/* 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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