76 lines
1.5 KiB
C++
76 lines
1.5 KiB
C++
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// Game_Music_Emu $vers. http://www.slack.net/~ant/
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#include "Ym2151_Emu.h"
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#include "ym2151.h"
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Ym2151_Emu::Ym2151_Emu() { PSG = 0; }
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Ym2151_Emu::~Ym2151_Emu()
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{
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if ( PSG ) ym2151_shutdown( PSG );
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}
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int Ym2151_Emu::set_rate( double sample_rate, double clock_rate )
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{
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if ( PSG )
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{
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ym2151_shutdown( PSG );
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PSG = 0;
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}
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PSG = ym2151_init( clock_rate, sample_rate );
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if ( !PSG )
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return 1;
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reset();
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return 0;
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}
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void Ym2151_Emu::reset()
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{
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ym2151_reset_chip( PSG );
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ym2151_set_mask( PSG, 0 );
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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 Ym2151_Emu::write( int addr, int data )
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{
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ym2151_update_one( PSG, DUMMYBUF, 0 );
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ym2151_write_reg( PSG, addr, data );
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}
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void Ym2151_Emu::mute_voices( int mask )
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{
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ym2151_set_mask( PSG, mask );
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}
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void Ym2151_Emu::run( int pair_count, sample_t* out )
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{
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SAMP bufL[ 1024 ];
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SAMP bufR[ 1024 ];
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SAMP * 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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ym2151_update_one( PSG, 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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