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85 lines
2.6 KiB
C
85 lines
2.6 KiB
C
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// Sega Master System/Mark III, Sega Genesis/Mega Drive, BBC Micro VGM music file emulator
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// Game_Music_Emu 0.6.0
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#ifndef VGM_EMU_H
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#define VGM_EMU_H
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#include "Vgm_Emu_Impl.h"
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// Emulates VGM music using SN76489/SN76496 PSG, YM2612, and YM2413 FM sound chips.
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// Supports custom sound buffer and frequency equalization when VGM uses just the PSG.
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// FM sound chips can be run at their proper rates, or slightly higher to reduce
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// aliasing on high notes. Currently YM2413 support requires that you supply a
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// YM2413 sound chip emulator. I can provide one I've modified to work with the library.
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class Vgm_Emu : public Vgm_Emu_Impl {
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public:
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// True if custom buffer and custom equalization are supported
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// TODO: move into Music_Emu and rename to something like supports_custom_buffer()
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bool is_classic_emu() const { return !uses_fm; }
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// Disable running FM chips at higher than normal rate. Will result in slightly
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// more aliasing of high notes.
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void disable_oversampling( bool disable = true ) { disable_oversampling_ = disable; }
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// VGM header format
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enum { header_size = 0x40 };
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struct header_t
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{
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char tag [4];
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byte data_size [4];
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byte version [4];
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byte psg_rate [4];
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byte ym2413_rate [4];
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byte gd3_offset [4];
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byte track_duration [4];
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byte loop_offset [4];
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byte loop_duration [4];
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byte frame_rate [4];
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byte noise_feedback [2];
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byte noise_width;
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byte unused1;
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byte ym2612_rate [4];
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byte ym2151_rate [4];
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byte data_offset [4];
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byte unused2 [8];
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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*) data; }
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static gme_type_t static_type() { return gme_vgm_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* gd3_data( int* size_out = 0 ) const; // use track_info()
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public:
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Vgm_Emu();
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~Vgm_Emu();
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protected:
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blargg_err_t track_info_( track_info_t*, int track ) const;
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blargg_err_t load_mem_( byte const*, long );
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blargg_err_t set_sample_rate_( long sample_rate );
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blargg_err_t start_track_( int );
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blargg_err_t play_( long count, sample_t* );
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blargg_err_t run_clocks( blip_time_t&, int );
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void set_tempo_( double );
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void mute_voices_( int mask );
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void set_voice( int, Blip_Buffer*, Blip_Buffer*, Blip_Buffer* );
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void update_eq( blip_eq_t const& );
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private:
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// removed; use disable_oversampling() and set_tempo() instead
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Vgm_Emu( bool oversample, double tempo = 1.0 );
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double fm_rate;
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long psg_rate;
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long vgm_rate;
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bool disable_oversampling_;
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bool uses_fm;
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blargg_err_t setup_fm();
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};
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#endif
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