81 lines
1.6 KiB
C++
81 lines
1.6 KiB
C++
// Game_Music_Emu $vers. http://www.slack.net/~ant/
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#include "Ym2413_Emu.h"
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extern "C" {
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#include "../vgmplay/chips/emu2413.h"
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}
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Ym2413_Emu::Ym2413_Emu() { opll = 0; }
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Ym2413_Emu::~Ym2413_Emu()
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{
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if ( opll ) OPLL_delete( (OPLL *) opll );
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}
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int Ym2413_Emu::set_rate( int sample_rate, int clock_rate )
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{
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if ( opll )
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{
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OPLL_delete( (OPLL *) opll );
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opll = 0;
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}
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opll = OPLL_new( clock_rate, sample_rate );
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if ( !opll )
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return 1;
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OPLL_SetChipMode( (OPLL *) opll, 0 );
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reset();
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return 0;
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}
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void Ym2413_Emu::reset()
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{
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OPLL_reset( (OPLL *) opll );
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OPLL_SetMuteMask( (OPLL *) opll, 0 );
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}
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void Ym2413_Emu::write( int addr, int data )
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{
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OPLL_writeIO( (OPLL *) opll, 0, addr );
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OPLL_writeIO( (OPLL *) opll, 1, data );
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}
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void Ym2413_Emu::mute_voices( int mask )
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{
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OPLL_SetMuteMask( (OPLL *) opll, mask );
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}
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void Ym2413_Emu::run( int pair_count, sample_t* out )
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{
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e_int32 bufMO[ 1024 ];
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e_int32 bufRO[ 1024 ];
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e_int32 * buffers[2] = { bufMO, bufRO };
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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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OPLL_calc_stereo( (OPLL *) opll, buffers, todo, -1 );
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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 = bufMO [i];
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output += bufRO [i];
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output *= 3;
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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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