67 lines
1.2 KiB
C++
67 lines
1.2 KiB
C++
// Game_Music_Emu $vers. http://www.slack.net/~ant/
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#include "Ym3812_Emu.h"
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#include <math.h>
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#include "dbopl.h"
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Ym3812_Emu::Ym3812_Emu() { opl = 0; }
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Ym3812_Emu::~Ym3812_Emu()
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{
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delete opl;
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}
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int Ym3812_Emu::set_rate( int sample_rate, int clock_rate )
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{
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delete opl;
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opl = 0;
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opl = new DBOPL::Chip;
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if ( !opl )
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return 1;
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this->sample_rate = sample_rate;
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this->clock_rate = clock_rate * 4;
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reset();
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return 0;
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}
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void Ym3812_Emu::reset()
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{
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opl->Setup( clock_rate, sample_rate );
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}
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void Ym3812_Emu::write( int addr, int data )
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{
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opl->WriteReg( addr, data );
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}
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void Ym3812_Emu::run( int pair_count, sample_t* out )
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{
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Bit32s buf[ 1024 ];
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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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opl->GenerateBlock2( todo, buf );
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for (int i = 0; i < todo; i++)
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{
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int output_l, output_r;
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int output = buf [i];
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output_l = output + out [0];
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output_r = output + 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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