Spc_Emu.h

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// Super Nintendo SPC music file emulator
 
// Game_Music_Emu https://bitbucket.org/mpyne/game-music-emu/
#ifndef SPC_EMU_H
#define SPC_EMU_H
 
#include "Fir_Resampler.h"
#include "Music_Emu.h"
#include "Snes_Spc.h"
#include "Spc_Filter.h"
 
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 };
        
        // 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; }
        
        // Prevents channels and global volumes from being phase-negated
        void disable_surround( bool disable = true );
        
        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;
 
public:
        Spc_Emu();
        ~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 );
private:
        byte const* file_data;
        long        file_size;
        Fir_Resampler<24> resampler;
        SPC_Filter filter;
        Snes_Spc apu;
        
        blargg_err_t play_and_filter( long count, sample_t out [] );
};
 
inline void Spc_Emu::disable_surround( bool b ) { apu.disable_surround( b ); }
 
#endif