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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.
252 lines
8.7 KiB
C++
252 lines
8.7 KiB
C++
// Common interface to game music file emulators
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// Game_Music_Emu https://bitbucket.org/mpyne/game-music-emu/
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#ifndef MUSIC_EMU_H
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#define MUSIC_EMU_H
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#include "Gme_File.h"
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class Multi_Buffer;
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struct Music_Emu : public Gme_File {
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public:
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// Basic functionality (see Gme_File.h for file loading/track info functions)
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// Set output sample rate. Must be called only once before loading file.
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blargg_err_t set_sample_rate( long sample_rate );
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// specifies if all 8 voices get rendered to their own stereo channel
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// default implementation of Music_Emu always returns not supported error (i.e. no multichannel support by default)
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// derived emus must override this if they support multichannel rendering
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virtual blargg_err_t set_multi_channel( bool is_enabled );
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// Start a track, where 0 is the first track. Also clears warning string.
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blargg_err_t start_track( int );
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// Generate 'count' samples info 'buf'. Output is in stereo. Any emulation
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// errors set warning string, and major errors also end track.
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typedef short sample_t;
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blargg_err_t play( long count, sample_t* buf );
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// Informational
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// Sample rate sound is generated at
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long sample_rate() const;
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// Index of current track or -1 if one hasn't been started
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int current_track() const;
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// Number of voices used by currently loaded file
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int voice_count() const;
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// Names of voices
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const char** voice_names() const;
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bool multi_channel() const;
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// Track status/control
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// Number of milliseconds (1000 msec = 1 second) played since beginning of track
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long tell() const;
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// Number of samples generated since beginning of track
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long tell_samples() const;
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// Seek to new time in track. Seeking backwards or far forward can take a while.
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blargg_err_t seek( long msec );
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// Equivalent to restarting track then skipping n samples
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blargg_err_t seek_samples( long n );
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// Skip n samples
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blargg_err_t skip( long n );
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// True if a track has reached its end
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bool track_ended() const;
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// Set start time and length of track fade out. Once fade ends track_ended() returns
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// true. Fade time can be changed while track is playing.
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void set_fade( long start_msec, long length_msec = 8000 );
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// Controls whether or not to automatically load and obey track length
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// metadata for supported emulators.
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//
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// @since 0.6.2.
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bool autoload_playback_limit() const;
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void set_autoload_playback_limit( bool do_autoload_limit );
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// Disable automatic end-of-track detection and skipping of silence at beginning
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void ignore_silence( bool disable = true );
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// Info for current track
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using Gme_File::track_info;
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blargg_err_t track_info( track_info_t* out ) const;
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// Sound customization
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// Adjust song tempo, where 1.0 = normal, 0.5 = half speed, 2.0 = double speed.
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// Track length as returned by track_info() assumes a tempo of 1.0.
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void set_tempo( double );
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// Mute/unmute voice i, where voice 0 is first voice
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void mute_voice( int index, bool mute = true );
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// Set muting state of all voices at once using a bit mask, where -1 mutes them all,
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// 0 unmutes them all, 0x01 mutes just the first voice, etc.
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void mute_voices( int mask );
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// Change overall output amplitude, where 1.0 results in minimal clamping.
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// Must be called before set_sample_rate().
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void set_gain( double );
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// Request use of custom multichannel buffer. Only supported by "classic" emulators;
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// on others this has no effect. Should be called only once *before* set_sample_rate().
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virtual void set_buffer( Multi_Buffer* ) { }
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// Enables/disables accurate emulation options, if any are supported. Might change
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// equalizer settings.
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void enable_accuracy( bool enable = true );
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// Sound equalization (treble/bass)
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// Frequency equalizer parameters (see gme.txt)
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// See gme.h for definition of struct gme_equalizer_t.
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typedef gme_equalizer_t equalizer_t;
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// Current frequency equalizater parameters
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equalizer_t const& equalizer() const;
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// Set frequency equalizer parameters
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void set_equalizer( equalizer_t const& );
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// Construct equalizer of given treble/bass settings
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static const equalizer_t make_equalizer( double treble, double bass )
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{
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const Music_Emu::equalizer_t e = { treble, bass,
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0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 };
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return e;
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}
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// Equalizer settings for TV speaker
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static equalizer_t const tv_eq;
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public:
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Music_Emu();
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~Music_Emu();
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protected:
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void set_max_initial_silence( int n ) { max_initial_silence = n; }
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void set_silence_lookahead( int n ) { silence_lookahead = n; }
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void set_voice_count( int n ) { voice_count_ = n; }
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void set_voice_names( const char* const* names );
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void set_track_ended() { emu_track_ended_ = true; }
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double gain() const { return gain_; }
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double tempo() const { return tempo_; }
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void remute_voices();
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blargg_err_t set_multi_channel_( bool is_enabled );
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virtual blargg_err_t set_sample_rate_( long sample_rate ) = 0;
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virtual void set_equalizer_( equalizer_t const& ) { }
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virtual void enable_accuracy_( bool /* enable */ ) { }
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virtual void mute_voices_( int mask ) = 0;
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virtual void set_tempo_( double ) = 0;
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virtual blargg_err_t start_track_( int ) = 0; // tempo is set before this
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virtual blargg_err_t play_( long count, sample_t* out ) = 0;
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virtual blargg_err_t skip_( long count );
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protected:
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virtual void unload();
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virtual void pre_load();
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virtual void post_load_();
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private:
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// general
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equalizer_t equalizer_;
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int max_initial_silence;
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const char** voice_names_;
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int voice_count_;
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int mute_mask_;
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double tempo_;
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double gain_;
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bool multi_channel_;
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// returns the number of output channels, i.e. usually 2 for stereo, unlesss multi_channel_ == true
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int out_channels() const { return this->multi_channel() ? 2*8 : 2; }
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long sample_rate_;
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blargg_long msec_to_samples( blargg_long msec ) const;
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// track-specific
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int current_track_;
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blargg_long out_time; // number of samples played since start of track
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blargg_long emu_time; // number of samples emulator has generated since start of track
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bool emu_track_ended_; // emulator has reached end of track
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bool emu_autoload_playback_limit_; // whether to load and obey track length by default
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volatile bool track_ended_;
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void clear_track_vars();
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void end_track_if_error( blargg_err_t );
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// fading
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blargg_long fade_start;
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int fade_step;
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void handle_fade( long count, sample_t* out );
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// silence detection
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int silence_lookahead; // speed to run emulator when looking ahead for silence
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bool ignore_silence_;
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long silence_time; // number of samples where most recent silence began
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long silence_count; // number of samples of silence to play before using buf
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long buf_remain; // number of samples left in silence buffer
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enum { buf_size = 2048 };
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blargg_vector<sample_t> buf;
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void fill_buf();
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void emu_play( long count, sample_t* out );
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Multi_Buffer* effects_buffer;
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friend Music_Emu* gme_internal_new_emu_( gme_type_t, int, bool );
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friend void gme_set_stereo_depth( Music_Emu*, double );
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};
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// base class for info-only derivations
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struct Gme_Info_ : Music_Emu
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{
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virtual blargg_err_t set_sample_rate_( long sample_rate );
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virtual void set_equalizer_( equalizer_t const& );
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virtual void enable_accuracy_( bool );
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virtual void mute_voices_( int mask );
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virtual void set_tempo_( double );
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virtual blargg_err_t start_track_( int );
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virtual blargg_err_t play_( long count, sample_t* out );
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virtual void pre_load();
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virtual void post_load_();
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};
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inline blargg_err_t Music_Emu::track_info( track_info_t* out ) const
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{
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return track_info( out, current_track_ );
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}
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inline long Music_Emu::sample_rate() const { return sample_rate_; }
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inline const char** Music_Emu::voice_names() const { return voice_names_; }
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inline int Music_Emu::voice_count() const { return voice_count_; }
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inline int Music_Emu::current_track() const { return current_track_; }
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inline bool Music_Emu::track_ended() const { return track_ended_; }
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inline const Music_Emu::equalizer_t& Music_Emu::equalizer() const { return equalizer_; }
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inline void Music_Emu::enable_accuracy( bool b ) { enable_accuracy_( b ); }
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inline void Music_Emu::set_tempo_( double t ) { tempo_ = t; }
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inline void Music_Emu::remute_voices() { mute_voices( mute_mask_ ); }
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inline void Music_Emu::ignore_silence( bool b ) { ignore_silence_ = b; }
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inline blargg_err_t Music_Emu::start_track_( int ) { return 0; }
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inline void Music_Emu::set_voice_names( const char* const* names )
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{
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// Intentional removal of const, so users don't have to remember obscure const in middle
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voice_names_ = const_cast<const char**> (names);
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}
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inline void Music_Emu::mute_voices_( int ) { }
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inline void Music_Emu::set_gain( double g )
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{
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assert( !sample_rate() ); // you must set gain before setting sample rate
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gain_ = g;
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}
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#endif
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