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 "higan/smp/smp.hpp"
#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 )    { smp.dsp.disable_surround( disable ); }

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

	// Enables an analog signal simulation filter
	void enable_filter( bool enable = true ) { _enable_filter = enable; if (enable) filter.clear(); }

	// Enables native echo
	void enable_echo( bool enable = true ) { smp.dsp.spc_dsp.enable_echo( enable ); }
	virtual void mute_effects( bool mute ) { enable_echo(!mute); }

    SuperFamicom::SMP const* get_smp() const;
    SuperFamicom::SMP * get_smp();
	
	// SPC file header
    enum { header_size = 0x100 };
	struct header_t
	{
		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_data; }

	static gme_type_t static_type()                 { return gme_spc_type; }

public:
    // deprecated
    using Music_Emu::load;
    blargg_err_t load( header_t const& h, Data_Reader& in ) // use Remaining_Reader
            { return load_remaining_( &h, sizeof h, in ); }
    byte const* trailer() const; // use track_info()
    long trailer_size() const;

// Implementation
public:
    Spc_Emu( gme_type_t );
    Spc_Emu() : Spc_Emu( gme_spc_type ) {}
	~Spc_Emu();

protected:
	blargg_err_t load_mem_( byte const*, long );
	blargg_err_t track_info_( track_info_t*, int track ) const;
	blargg_err_t set_sample_rate_( long );
	blargg_err_t start_track_( int );
	blargg_err_t play_( long, sample_t* );
	blargg_err_t skip_( long );
	void mute_voices_( int );
	void set_tempo_( double );
    void enable_accuracy_( bool );
    byte const* file_data;
    long        file_size;

private:
	Spc_Emu_Resampler resampler;
	SPC_Filter filter;
    SuperFamicom::SMP smp;

	bool _enable_filter;
	
	blargg_err_t play_and_filter( long count, sample_t out [] );
};

inline SuperFamicom::SMP const* Spc_Emu::get_smp() const { return &smp; }
inline SuperFamicom::SMP * Spc_Emu::get_smp() { return &smp; }

#endif