84 lines
1.7 KiB
C++
84 lines
1.7 KiB
C++
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// Game_Music_Emu $vers. http://www.slack.net/~ant/
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#include "Qsound_Apu.h"
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#include "qmix.h"
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Qsound_Apu::Qsound_Apu() { chip = 0; rom = 0; rom_size = 0; sample_rate = 0; }
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Qsound_Apu::~Qsound_Apu()
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{
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if ( chip ) free( chip );
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if ( rom ) free( rom );
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}
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int Qsound_Apu::set_rate( int clock_rate )
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{
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if ( chip )
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{
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free( chip );
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chip = 0;
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}
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chip = malloc( _qmix_get_state_size() );
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if ( !chip )
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return 0;
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reset();
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return clock_rate / 166;
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}
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void Qsound_Apu::set_sample_rate( int sample_rate )
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{
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this->sample_rate = sample_rate;
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if ( chip ) _qmix_set_sample_rate( chip, sample_rate );
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}
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void Qsound_Apu::reset()
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{
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_qmix_clear_state( chip );
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_qmix_set_sample_rate( chip, sample_rate );
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if ( rom ) _qmix_set_sample_rom( chip, rom, rom_size );
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}
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void Qsound_Apu::write( int addr, int data )
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{
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_qmix_command( chip, addr, data );
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}
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void Qsound_Apu::write_rom( int size, int start, int length, void const* data )
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{
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if ( size > rom_size )
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{
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rom_size = size;
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rom = realloc( rom, size );
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}
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if ( start > size ) start = size;
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if ( start + length > size ) length = size - start;
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memcpy( (uint8*)rom + start, data, length );
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if ( chip ) _qmix_set_sample_rom( chip, rom, rom_size );
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}
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void Qsound_Apu::run( int pair_count, sample_t* out )
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{
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sint16 buf[ 1024 * 2 ];
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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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_qmix_render( chip, buf, todo );
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for (int i = 0; i < todo * 2; i++)
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{
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int output = buf [i];
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output += out [0];
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if ( (short)output != output ) output = 0x7FFF ^ ( output >> 31 );
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out [0] = output;
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out++;
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}
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pair_count -= todo;
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}
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}
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