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718112a8fe
Currently none of these is being used, but eventually they will, once more code gets ported over. So it's better to have them right away and avoid editing the project file too much, only to revert that later.
86 lines
2.7 KiB
C++
86 lines
2.7 KiB
C++
// Sega Master System/Mark III, Sega Genesis/Mega Drive, BBC Micro VGM music file emulator
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// Game_Music_Emu https://bitbucket.org/mpyne/game-music-emu/
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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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blargg_err_t set_multi_channel ( bool is_enabled ) override;
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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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