cog/Frameworks/GME/gme/Spc_Emu.h

// Super Nintendo SPC music file emulator

// Game_Music_Emu $vers
#ifndef SPC_EMU_H
#define SPC_EMU_H

#include "Music_Emu.h"
#include "Snes_Spc.h"
#include "Spc_Filter.h"

#if GME_SPC_FAST_RESAMPLER
	#include "Upsampler.h"
	typedef Upsampler Spc_Emu_Resampler;
#else
	#include "Fir_Resampler.h"
	typedef Fir_Resampler<24> Spc_Emu_Resampler;
#endif

class Spc_Emu : public Music_Emu {
public:
	// The Super Nintendo hardware samples at 32kHz. Other sample rates are
	// handled by resampling the 32kHz output; emulation accuracy is not affected.
	enum { native_sample_rate = 32000 };
	
	// Disables annoying pseudo-surround effect some music uses
	void disable_surround( bool disable = true )    { apu.disable_surround( disable ); }

	// Enables gaussian, cubic or sinc interpolation
	void interpolation_level( int level = 0 )   { apu.interpolation_level( level ); }

	Snes_Spc const* get_apu() const;
	Snes_Spc * get_apu();
	
	// SPC file header
	struct header_t
	{
		enum { size = 0x100 };
		
		char tag       [35];
		byte format;
		byte version;
		byte pc        [ 2];
		byte a, x, y, psw, sp;
		byte unused    [ 2];
		char song      [32];
		char game      [32];
		char dumper    [16];
		char comment   [32];
		byte date      [11];
		byte len_secs  [ 3];
		byte fade_msec [ 4];
		char author    [32]; // sometimes first char should be skipped (see official SPC spec)
		byte mute_mask;
		byte emulator;
		byte unused2   [46];
	};
	
	// Header for currently loaded file
	header_t const& header() const                  { return *(header_t const*) file_begin(); }

	blargg_err_t hash_( Hash_Function& ) const;
	
	static gme_type_t static_type()                 { return gme_spc_type; }
	
// Implementation
public:
	Spc_Emu();
	~Spc_Emu();

protected:
	virtual blargg_err_t load_mem_( byte const [], int );
	virtual blargg_err_t track_info_( track_info_t*, int track ) const;
	virtual blargg_err_t set_sample_rate_( int );
	virtual blargg_err_t start_track_( int );
	virtual blargg_err_t play_( int, sample_t [] );
	virtual blargg_err_t skip_( int );
	virtual void mute_voices_( int );
	virtual void set_tempo_( double );

private:
	Spc_Emu_Resampler resampler;
	Spc_Filter filter;
	Snes_Spc apu;
	
	byte const* trailer_() const;
	int trailer_size_() const;
	blargg_err_t play_and_filter( int count, sample_t out [] );
};

inline Snes_Spc const* Spc_Emu::get_apu() const { return &apu; }
inline Snes_Spc * Spc_Emu::get_apu() { return &apu; }

#endif