89 lines
2.5 KiB
C++
89 lines
2.5 KiB
C++
// Sega Genesis/Mega Drive GYM music file emulator
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// Performs PCM timing recovery to improve sample quality.
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// Game_Music_Emu $vers
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#ifndef GYM_EMU_H
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#define GYM_EMU_H
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#include "Dual_Resampler.h"
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#include "Ym2612_Emu.h"
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#include "Music_Emu.h"
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#include "Sms_Apu.h"
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class Gym_Emu : public Music_Emu {
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public:
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// GYM file header (optional; many files have NO header at all)
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struct header_t
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{
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enum { size = 428 };
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char tag [ 4];
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char song [ 32];
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char game [ 32];
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char copyright [ 32];
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char emulator [ 32];
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char dumper [ 32];
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char comment [256];
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byte loop_start [ 4]; // in 1/60 seconds, 0 if not looped
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byte packed [ 4];
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};
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// Header for currently loaded file
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header_t const& header() const { return header_; }
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static gme_type_t static_type() { return gme_gym_type; }
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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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blargg_err_t hash_( Hash_Function& ) const;
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// Implementation
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public:
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Gym_Emu();
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~Gym_Emu();
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protected:
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virtual blargg_err_t load_mem_( byte const [], int );
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virtual blargg_err_t track_info_( track_info_t*, int track ) const;
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virtual blargg_err_t set_sample_rate_( int sample_rate );
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virtual blargg_err_t start_track_( int );
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virtual blargg_err_t play_( int count, sample_t [] );
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virtual void mute_voices_( int );
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virtual void set_tempo_( double );
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private:
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// Log
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byte const* pos; // current position
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byte const* loop_begin;
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int log_offset; // size of header (0 or header_t::size)
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int loop_remain; // frames remaining until loop_begin has been located
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int clocks_per_frame;
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bool disable_oversampling_;
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// PCM
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int pcm_amp;
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int prev_pcm_count; // for detecting beginning/end of group of samples
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int pcm_enabled;
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// large objects
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Dual_Resampler resampler;
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Stereo_Buffer stereo_buf;
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Blip_Buffer * pcm_buf;
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Ym2612_Emu fm;
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Sms_Apu apu;
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Blip_Synth_Fast pcm_synth;
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header_t header_;
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byte const* log_begin() const { return file_begin() + log_offset; }
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void parse_frame();
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void run_pcm( byte const in [], int count );
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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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