Vgm_Emu_Impl.h

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// Low-level parts of Vgm_Emu
 
// Game_Music_Emu https://bitbucket.org/mpyne/game-music-emu/
#ifndef VGM_EMU_IMPL_H
#define VGM_EMU_IMPL_H
 
#include "Dual_Resampler.h"
#include "Classic_Emu.h"
#include "Ym2413_Emu.h"
#include "Ym2612_Emu.h"
#include "Sms_Apu.h"
 
template<class Emu>
class Ym_Emu : public Emu {
protected:
        int last_time;
        short* out;
        enum { disabled_time = -1 };
public:
        Ym_Emu()                        : last_time( disabled_time ), out( NULL ) { }
        void enable( bool b )           { last_time = b ? 0 : disabled_time; }
        bool enabled() const            { return last_time != disabled_time; }
        void begin_frame( short* p );
        int run_until( int time );
};
 
class Vgm_Emu_Impl : public Classic_Emu, private Dual_Resampler {
public:
        typedef Classic_Emu::sample_t sample_t;
protected:
        enum { stereo = 2 };
        
        typedef int vgm_time_t;
        
        enum { fm_time_bits = 12 };
        typedef int fm_time_t;
        long fm_time_offset;
        int fm_time_factor;
        fm_time_t to_fm_time( vgm_time_t ) const;
        
        enum { blip_time_bits = 12 };
        int blip_time_factor;
        blip_time_t to_blip_time( vgm_time_t ) const;
        
        byte const* data;
        byte const* loop_begin;
        byte const* data_end;
        void update_fm_rates( long* ym2413_rate, long* ym2612_rate ) const;
        
        vgm_time_t vgm_time;
        byte const* pos;
        blip_time_t run_commands( vgm_time_t );
        int play_frame( blip_time_t blip_time, int sample_count, sample_t* buf );
        
        byte const* pcm_data;
        byte const* pcm_pos;
        int dac_amp;
        int dac_disabled; // -1 if disabled
        void write_pcm( vgm_time_t, int amp );
        
        Ym_Emu<Ym2612_Emu> ym2612;
        Ym_Emu<Ym2413_Emu> ym2413;
        
        Blip_Buffer blip_buf;
        Sms_Apu psg;
        Blip_Synth<blip_med_quality,1> dac_synth;
        
        friend class Vgm_Emu;
};
 
#endif