/gme/Vgm_Emu_Impl.h

 1// Low-level parts of Vgm_Emu
 2
 3// Game_Music_Emu 0.5.5
 4#ifndef VGM_EMU_IMPL_H
 5#define VGM_EMU_IMPL_H
 6
 7#include "Dual_Resampler.h"
 8#include "Classic_Emu.h"
 9#include "Ym2413_Emu.h"
10#include "Ym2612_Emu.h"
11#include "Sms_Apu.h"
12
13template<class Emu>
14class Ym_Emu : public Emu {
15protected:
16	int last_time;
17	short* out;
18	enum { disabled_time = -1 };
19public:
20	Ym_Emu()                        : last_time( disabled_time ), out( NULL ) { }
21	void enable( bool b )           { last_time = b ? 0 : disabled_time; }
22	bool enabled() const            { return last_time != disabled_time; }
23	void begin_frame( short* p );
24	int run_until( int time );
25};
26
27class Vgm_Emu_Impl : public Classic_Emu, private Dual_Resampler {
28public:
29	typedef Classic_Emu::sample_t sample_t;
30protected:
31	enum { stereo = 2 };
32	
33	typedef int vgm_time_t;
34	
35	enum { fm_time_bits = 12 };
36	typedef int fm_time_t;
37	long fm_time_offset;
38	int fm_time_factor;
39	fm_time_t to_fm_time( vgm_time_t ) const;
40	
41	enum { blip_time_bits = 12 };
42	int blip_time_factor;
43	blip_time_t to_blip_time( vgm_time_t ) const;
44	
45	byte const* data;
46	byte const* loop_begin;
47	byte const* data_end;
48	void update_fm_rates( long* ym2413_rate, long* ym2612_rate ) const;
49	
50	vgm_time_t vgm_time;
51	byte const* pos;
52	blip_time_t run_commands( vgm_time_t );
53	int play_frame( blip_time_t blip_time, int sample_count, sample_t* buf );
54	
55	byte const* pcm_data;
56	byte const* pcm_pos;
57	int dac_amp;
58	int dac_disabled; // -1 if disabled
59	void write_pcm( vgm_time_t, int amp );
60	
61	Ym_Emu<Ym2612_Emu> ym2612;
62	Ym_Emu<Ym2413_Emu> ym2413;
63	
64	Blip_Buffer blip_buf;
65	Sms_Apu psg;
66	Blip_Synth<blip_med_quality,1> dac_synth;
67	
68	friend class Vgm_Emu;
69};
70
71#endif