88 lines
1.8 KiB
C++
88 lines
1.8 KiB
C++
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// Game_Music_Emu $vers. http://www.slack.net/~ant/
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#include "Ym2612_Emu.h"
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#include "fm.h"
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#include "blargg_errors.h"
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// Ym2612_Emu
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Ym2612_Emu::~Ym2612_Emu()
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{
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if ( impl )
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ym2612_shutdown( impl );
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}
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const char* Ym2612_Emu::set_rate( double sample_rate, double clock_rate )
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{
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if ( impl )
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{
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ym2612_shutdown( impl );
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impl = 0;
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}
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if ( !clock_rate )
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clock_rate = sample_rate * 144.;
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impl = ym2612_init( (long) (clock_rate + 0.5), (long) (sample_rate + 0.5) );
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if ( !impl )
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return blargg_err_memory;
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return 0;
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}
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void Ym2612_Emu::reset()
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{
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ym2612_reset_chip( impl );
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}
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static stream_sample_t* DUMMYBUF[0x02] = {(stream_sample_t*)NULL, (stream_sample_t*)NULL};
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void Ym2612_Emu::write0( int addr, int data )
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{
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ym2612_update_one( impl, DUMMYBUF, 0 );
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ym2612_write( impl, 0, addr );
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ym2612_write( impl, 1, data );
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}
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void Ym2612_Emu::write1( int addr, int data )
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{
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ym2612_update_one( impl, DUMMYBUF, 0 );
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ym2612_write( impl, 2, addr );
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ym2612_write( impl, 3, data );
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}
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void Ym2612_Emu::mute_voices( int mask )
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{
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ym2612_set_mutemask( impl, mask );
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}
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void Ym2612_Emu::run( int pair_count, sample_t* out )
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{
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stream_sample_t bufL[ 1024 ];
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stream_sample_t bufR[ 1024 ];
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stream_sample_t * buffers[2] = { bufL, bufR };
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while (pair_count > 0)
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{
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int todo = pair_count;
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if (todo > 1024) todo = 1024;
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ym2612_update_one( impl, buffers, todo );
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for (int i = 0; i < todo; i++)
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{
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int output_l = bufL [i];
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int output_r = bufR [i];
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output_l += out [0];
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output_r += out [1];
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if ( (short)output_l != output_l ) output_l = 0x7FFF ^ ( output_l >> 31 );
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if ( (short)output_r != output_r ) output_r = 0x7FFF ^ ( output_r >> 31 );
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out [0] = output_l;
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out [1] = output_r;
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out += 2;
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}
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pair_count -= todo;
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}
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}
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