Ay_Emu.h
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Ay_Emu.h
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	// Sinclair Spectrum AY music file emulator

	// Game_Music_Emu https://bitbucket.org/mpyne/game-music-emu/
	#ifndef AY_EMU_H
	#define AY_EMU_H

	#include "Classic_Emu.h"
	#include "Ay_Apu.h"
	#include "Ay_Cpu.h"

	class Ay_Emu : private Ay_Cpu, public Classic_Emu {
	typedef Ay_Cpu cpu;
	public:
	// AY file header
	enum { header_size = 0x14 };
	struct header_t
	{
	byte tag [8];
	byte vers;
	byte player;
	byte unused [2];
	byte author [2];
	byte comment [2];
	byte max_track;
	byte first_track;
	byte track_info [2];
	};

	static gme_type_t static_type() { return gme_ay_type; }
	public:
	Ay_Emu();
	~Ay_Emu();
	struct file_t {
	header_t const* header;
	byte const* end;
	byte const* tracks;
	};
	protected:
	blargg_err_t track_info_( track_info_t*, int track ) const;
	blargg_err_t load_mem_( byte const*, long );
	blargg_err_t start_track_( int );
	blargg_err_t run_clocks( blip_time_t&, int );
	void set_tempo_( double );
	void set_voice( int, Blip_Buffer, Blip_Buffer, Blip_Buffer* );
	void update_eq( blip_eq_t const& );
	private:
	file_t file;

	cpu_time_t play_period;
	cpu_time_t next_play;
	Blip_Buffer* beeper_output;
	int beeper_delta;
	int last_beeper;
	int apu_addr;
	int cpc_latch;
	bool spectrum_mode;
	bool cpc_mode;

	// large items
	struct {
	byte padding1 [0x100];
	byte ram [0x10000 + 0x100];
	} mem;
	Ay_Apu apu;
	friend void ay_cpu_out( Ay_Cpu*, cpu_time_t, unsigned addr, int data );
	void cpu_out_misc( cpu_time_t, unsigned addr, int data );
	};

	#endif