74 lines
1.4 KiB
C++
74 lines
1.4 KiB
C++
// Game_Music_Emu $vers. http://www.slack.net/~ant/
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#include "K051649_Emu.h"
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#include "k051649.h"
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K051649_Emu::K051649_Emu() { SCC = 0; }
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K051649_Emu::~K051649_Emu()
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{
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if ( SCC ) device_stop_k051649( SCC );
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}
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int K051649_Emu::set_rate( int clock_rate )
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{
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if ( SCC )
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{
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device_stop_k051649( SCC );
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SCC = 0;
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}
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SCC = device_start_k051649( clock_rate );
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if ( !SCC )
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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 K051649_Emu::reset()
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{
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device_reset_k051649( SCC );
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k051649_set_mute_mask( SCC, 0 );
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}
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void K051649_Emu::write( int port, int offset, int data )
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{
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k051649_w( SCC, (port << 1) | 0x00, offset);
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k051649_w( SCC, (port << 1) | 0x01, data);
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}
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void K051649_Emu::mute_voices( int mask )
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{
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k051649_set_mute_mask( SCC, mask );
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}
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void K051649_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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k051649_update( SCC, 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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