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83 lines
2.1 KiB
C
83 lines
2.1 KiB
C
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// Super Nintendo SPC music file emulator
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// Game_Music_Emu https://bitbucket.org/mpyne/game-music-emu/
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#ifndef SPC_EMU_H
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#define SPC_EMU_H
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#include "Fir_Resampler.h"
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#include "Music_Emu.h"
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#include "Snes_Spc.h"
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#include "Spc_Filter.h"
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class Spc_Emu : public Music_Emu {
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public:
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// The Super Nintendo hardware samples at 32kHz. Other sample rates are
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// handled by resampling the 32kHz output; emulation accuracy is not affected.
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enum { native_sample_rate = 32000 };
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// SPC file header
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enum { header_size = 0x100 };
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struct header_t
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{
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char tag [35];
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byte format;
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byte version;
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byte pc [2];
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byte a, x, y, psw, sp;
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byte unused [2];
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char song [32];
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char game [32];
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char dumper [16];
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char comment [32];
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byte date [11];
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byte len_secs [3];
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byte fade_msec [4];
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char author [32]; // sometimes first char should be skipped (see official SPC spec)
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byte mute_mask;
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byte emulator;
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byte unused2 [46];
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};
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// Header for currently loaded file
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header_t const& header() const { return *(header_t const*) file_data; }
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// Prevents channels and global volumes from being phase-negated
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void disable_surround( bool disable = true );
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static gme_type_t static_type() { return gme_spc_type; }
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public:
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// deprecated
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using Music_Emu::load;
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blargg_err_t load( header_t const& h, Data_Reader& in ) // use Remaining_Reader
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{ return load_remaining_( &h, sizeof h, in ); }
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byte const* trailer() const; // use track_info()
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long trailer_size() const;
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public:
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Spc_Emu();
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~Spc_Emu();
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protected:
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blargg_err_t load_mem_( byte const*, long );
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blargg_err_t track_info_( track_info_t*, int track ) const;
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blargg_err_t set_sample_rate_( long );
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blargg_err_t start_track_( int );
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blargg_err_t play_( long, sample_t* );
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blargg_err_t skip_( long );
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void mute_voices_( int );
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void set_tempo_( double );
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void enable_accuracy_( bool );
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private:
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byte const* file_data;
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long file_size;
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Fir_Resampler<24> resampler;
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SPC_Filter filter;
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Snes_Spc apu;
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blargg_err_t play_and_filter( long count, sample_t out [] );
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};
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inline void Spc_Emu::disable_surround( bool b ) { apu.disable_surround( b ); }
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#endif
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