62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
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// YM2413 FM sound chip emulator interface
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// Game_Music_Emu 0.6-pre
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#ifndef YM2413_EMU_H
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#define YM2413_EMU_H
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#include "blargg_common.h"
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#include "emu2413.h"
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enum { out_chan_count = 2 }; // stereo
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enum { channel_count = 14 };
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enum { disabled_time = -1 };
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struct Ym2413_Emu {
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OPLL opll;
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// Impl
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int last_time;
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short* out;
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};
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void Ym2413_init( struct Ym2413_Emu* this );
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static inline bool Ym2413_supported( void ) { return true; }
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// Sets output sample rate and chip clock rates, in Hz. Returns non-zero
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// if error.
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int Ym2413_set_rate( struct Ym2413_Emu* this, double sample_rate, double clock_rate );
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// Resets to power-up state
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void Ym2413_reset( struct Ym2413_Emu* this );
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// Mutes voice n if bit n (1 << n) of mask is set
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void Ym2413_mute_voices( struct Ym2413_Emu* this, int mask );
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// Writes data to addr
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void Ym2413_write( struct Ym2413_Emu* this, int addr, int data ) ICODE_ATTR;
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// Runs and writes pair_count*2 samples to output
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void Ym2413_run( struct Ym2413_Emu* this, int pair_count, short* out ) ICODE_ATTR;
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static inline void Ym2413_enable( struct Ym2413_Emu* this, bool b ) { this->last_time = b ? 0 : disabled_time; }
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static inline bool Ym2413_enabled( struct Ym2413_Emu* this ) { return this->last_time != disabled_time; }
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static inline void Ym2413_begin_frame( struct Ym2413_Emu* this, short* buf ) { this->out = buf; this->last_time = 0; }
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static inline int Ym2413_run_until( struct Ym2413_Emu* this, int time )
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{
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int count = time - this->last_time;
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if ( count > 0 )
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{
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if ( this->last_time < 0 )
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return false;
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this->last_time = time;
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short* p = this->out;
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this->out += count * out_chan_count;
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Ym2413_run( this, count, p );
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}
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return true;
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}
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#endif
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