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83 lines
2 KiB
C
83 lines
2 KiB
C
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// Sega Genesis/Mega Drive GYM music file emulator
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// Includes with PCM timing recovery to improve sample quality.
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// Game_Music_Emu https://bitbucket.org/mpyne/game-music-emu/
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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, private Dual_Resampler {
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public:
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// GYM file header
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enum { header_size = 428 };
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struct header_t
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{
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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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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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enum { gym_rate = 60 };
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long track_length() const; // use track_info()
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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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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 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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void mute_voices_( int );
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void set_tempo_( double );
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int play_frame( blip_time_t blip_time, int sample_count, sample_t* buf );
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private:
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// sequence data begin, loop begin, current position, end
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const byte* data;
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const byte* loop_begin;
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const byte* pos;
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const byte* data_end;
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blargg_long loop_remain; // frames remaining until loop beginning has been located
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header_t header_;
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double fm_sample_rate;
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blargg_long clocks_per_frame;
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void parse_frame();
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// dac (pcm)
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int dac_amp;
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int prev_dac_count;
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bool dac_enabled;
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bool dac_muted;
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void run_dac( int );
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// sound
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Blip_Buffer blip_buf;
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Ym2612_Emu fm;
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Blip_Synth<blip_med_quality,1> dac_synth;
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Sms_Apu apu;
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byte dac_buf [1024];
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};
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#endif
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