Mercurial > spc_convert
view demo/save_state.c @ 3:95cdedd01422
allow user to select number of seconds to convert
author | Robert McIntyre <rlm@mit.edu> |
---|---|
date | Fri, 21 Oct 2011 06:44:35 -0700 |
parents | e38dacceb958 |
children |
line wrap: on
line source
1 /* Loads "test.spc", skips 5 seconds, saves exact emulator state to "state.bin",2 hen records 5 seconds to "first.wav". When run again, loads this state back into3 emulator and records 5 seconds to "second.wav". These two wave files should4 be identical.6 Usage: save_state [test.spc]7 */9 #include "snes_spc/spc.h"11 #include "wave_writer.h"12 #include "demo_util.h" /* error(), load_file() */14 static SNES_SPC* snes_spc;16 void record_wav( const char* path, int secs )17 {18 /* Start writing wave file */19 wave_open( spc_sample_rate, path );20 wave_enable_stereo();21 while ( wave_sample_count() < secs * spc_sample_rate * 2 )22 {23 /* Play into buffer */24 #define BUF_SIZE 204825 short buf [BUF_SIZE];26 error( spc_play( snes_spc, BUF_SIZE, buf ) );28 wave_write( buf, BUF_SIZE );29 }30 wave_close();31 }33 void state_save( unsigned char** out, void* in, size_t size )34 {35 memcpy( *out, in, size );36 *out += size;37 }39 void make_save_state( const char* path )40 {41 /* Load SPC */42 long spc_size;43 void* spc = load_file( path, &spc_size );44 error( spc_load_spc( snes_spc, spc, spc_size ) );45 free( spc );46 spc_clear_echo( snes_spc );48 /* Skip several seconds */49 error( spc_play( snes_spc, 5 * spc_sample_rate * 2, 0 ) );51 /* Save state to file */52 {53 static unsigned char state [spc_state_size]; /* buffer large enough for data */54 unsigned char* out = state;55 spc_copy_state( snes_spc, &out, state_save );56 write_file( "state.bin", state, out - state );57 }59 record_wav( "first.wav", 5 );60 }62 void state_load( unsigned char** in, void* out, size_t size )63 {64 memcpy( out, *in, size );65 *in += size;66 }68 void use_save_state()69 {70 /* Load state into memory */71 long state_size;72 unsigned char* state = load_file( "state.bin", &state_size );74 /* Load into emulator */75 unsigned char* in = state;76 spc_copy_state( snes_spc, &in, state_load );77 assert( in - state <= state_size ); /* be sure it didn't read past end */79 record_wav( "second.wav", 5 );80 }82 int file_exists( const char* path )83 {84 FILE* file = fopen( path, "rb" );85 if ( !file )86 return 0;88 fclose( file );89 return 1;90 }92 int main( int argc, char** argv )93 {94 snes_spc = spc_new();95 if ( !snes_spc ) error( "Out of memory" );97 /* Make new state if it doesn't exist, otherwise load it and98 record to wave file */99 if ( !file_exists( "state.bin" ) )100 make_save_state( (argc > 1) ? argv [1] : "test.spc" );101 else102 use_save_state();104 spc_delete( snes_spc );106 return 0;107 }