70 lines
2.2 KiB
C++
70 lines
2.2 KiB
C++
// Sega VGM music file emulator
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// Game_Music_Emu $vers
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#ifndef VGM_EMU_H
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#define VGM_EMU_H
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#include "Classic_Emu.h"
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#include "Dual_Resampler.h"
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#include "Vgm_Core.h"
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/* Emulates VGM music using SN76489/SN76496 PSG, and YM2612 and YM2413 FM sound chips.
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Supports custom sound buffer and frequency equalization when VGM uses just the PSG. FM
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sound chips can be run at their proper rates, or slightly higher to reduce aliasing on
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high notes. A YM2413 is supported but not provided separately from the library. */
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class Vgm_Emu : public Classic_Emu {
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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 !core.uses_fm(); }
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// Disables 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 file header (see Vgm_Core.h)
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typedef Vgm_Core::header_t header_t;
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// Header for currently loaded file
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header_t const& header() const { return core.header(); }
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blargg_err_t hash_( Hash_Function& ) const;
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// Gd3 tag for currently loaded file
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blargg_err_t gd3_data( const unsigned char ** data, int * size );
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static gme_type_t static_type() { return gme_vgm_type; }
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// Implementation
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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 [], int );
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blargg_err_t set_sample_rate_( int sample_rate );
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blargg_err_t start_track_( int );
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blargg_err_t play_( int count, sample_t []);
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blargg_err_t run_clocks( blip_time_t&, int );
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virtual void set_tempo_( double );
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virtual void mute_voices_( int mask );
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virtual void set_voice( int, Blip_Buffer*, Blip_Buffer*, Blip_Buffer* );
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virtual void update_eq( blip_eq_t const& );
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virtual void unload();
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private:
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bool disable_oversampling_;
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unsigned muted_voices;
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Dual_Resampler resampler;
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Vgm_Core core;
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void check_end();
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void check_warning();
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int play_frame( blip_time_t blip_time, int sample_count, sample_t buf [] );
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static int play_frame_( void*, blip_time_t, int, sample_t [] );
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};
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#endif
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