248 lines
8.3 KiB
C
248 lines
8.3 KiB
C
/* Game music emulator library C interface (also usable from C++) */
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/* Game_Music_Emu 0.6.1 */
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#ifndef GME_H
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#define GME_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define GME_VERSION 0x000601 /* 1 byte major, 1 byte minor, 1 byte patch-level */
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/* Error string returned by library functions, or NULL if no error (success) */
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typedef const char* gme_err_t;
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/* First parameter of most gme_ functions is a pointer to the Music_Emu */
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typedef struct Music_Emu Music_Emu;
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/******** Basic operations ********/
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/* Create emulator and load game music file/data into it. Sets *out to new emulator. */
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gme_err_t gme_open_file( const char path [], Music_Emu** out, int sample_rate );
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/* Number of tracks available */
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int gme_track_count( Music_Emu const* );
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/* Start a track, where 0 is the first track */
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gme_err_t gme_start_track( Music_Emu*, int index );
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/* Generate 'count' 16-bit signed samples info 'out'. Output is in stereo. */
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gme_err_t gme_play( Music_Emu*, int count, short out [] );
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/* Finish using emulator and free memory */
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void gme_delete( Music_Emu* );
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/******** Track position/length ********/
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/* Set time to start fading track out. Once fade ends track_ended() returns true.
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Fade time can be changed while track is playing. */
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void gme_set_fade( Music_Emu*, int start_msec );
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/* True if a track has reached its end */
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int gme_track_ended( Music_Emu const* );
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/* Number of milliseconds (1000 = one second) played since beginning of track */
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int gme_tell( Music_Emu const* );
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/* Number of samples generated since beginning of track */
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int gme_tell_samples( Music_Emu const* );
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/* Seek to new time in track. Seeking backwards or far forward can take a while. */
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gme_err_t gme_seek( Music_Emu*, int msec );
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/* Equivalent to restarting track then skipping n samples */
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gme_err_t gme_seek_samples( Music_Emu*, int n );
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/******** Informational ********/
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/* If you only need track information from a music file, pass gme_info_only for
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sample_rate to open/load. */
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enum { gme_info_only = -1 };
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/* Most recent warning string, or NULL if none. Clears current warning after returning.
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Warning is also cleared when loading a file and starting a track. */
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const char* gme_warning( Music_Emu* );
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/* Load m3u playlist file (must be done after loading music) */
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gme_err_t gme_load_m3u( Music_Emu*, const char path [] );
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/* Clear any loaded m3u playlist and any internal playlist that the music format
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supports (NSFE for example). */
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void gme_clear_playlist( Music_Emu* );
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/* Gets information for a particular track (length, name, author, etc.).
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Must be freed after use. */
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typedef struct gme_info_t gme_info_t;
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gme_err_t gme_track_info( Music_Emu const*, gme_info_t** out, int track );
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/* Frees track information */
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void gme_free_info( gme_info_t* );
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struct gme_info_t
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{
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/* times in milliseconds; -1 if unknown */
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int length; /* total length, if file specifies it */
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int intro_length; /* length of song up to looping section */
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int loop_length; /* length of looping section */
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/* Length if available, otherwise intro_length+loop_length*2 if available,
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otherwise a default of 150000 (2.5 minutes). */
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int play_length;
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int i4,i5,i6,i7,i8,i9,i10,i11,i12,i13,i14,i15; /* reserved */
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/* empty string ("") if not available */
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const char* system;
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const char* game;
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const char* song;
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const char* author;
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const char* copyright;
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const char* comment;
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const char* dumper;
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const char *s7,*s8,*s9,*s10,*s11,*s12,*s13,*s14,*s15; /* reserved */
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};
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/******** Advanced playback ********/
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/* Adjust stereo echo depth, where 0.0 = off and 1.0 = maximum. Has no effect for
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GYM, SPC, and Sega Genesis VGM music */
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void gme_set_stereo_depth( Music_Emu*, double depth );
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/* Disable automatic end-of-track detection and skipping of silence at beginning
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if ignore is true */
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void gme_ignore_silence( Music_Emu*, int ignore );
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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 gme_set_tempo( Music_Emu*, double tempo );
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/* Number of voices used by currently loaded file */
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int gme_voice_count( Music_Emu const* );
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/* Name of voice i, from 0 to gme_voice_count() - 1 */
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const char* gme_voice_name( Music_Emu const*, int i );
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/* Mute/unmute voice i, where voice 0 is first voice */
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void gme_mute_voice( Music_Emu*, int index, int mute );
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/* Set muting state of all voices at once using a bit mask, where -1 mutes all
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voices, 0 unmutes them all, 0x01 mutes just the first voice, etc. */
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void gme_mute_voices( Music_Emu*, int muting_mask );
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/* Frequency equalizer parameters (see gme.txt) */
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/* Implementers: If modified, also adjust Music_Emu::make_equalizer as needed */
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typedef struct gme_equalizer_t
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{
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double treble; /* -50.0 = muffled, 0 = flat, +5.0 = extra-crisp */
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double bass; /* 1 = full bass, 90 = average, 16000 = almost no bass */
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double d2,d3,d4,d5,d6,d7,d8,d9; /* reserved */
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} gme_equalizer_t;
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/* Get current frequency equalizater parameters */
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void gme_equalizer( Music_Emu const*, gme_equalizer_t* out );
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/* Change frequency equalizer parameters */
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void gme_set_equalizer( Music_Emu*, gme_equalizer_t const* eq );
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/* Enables/disables most accurate sound emulation options */
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void gme_enable_accuracy( Music_Emu*, int enabled );
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/******** Game music types ********/
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/* Music file type identifier. Can also hold NULL. */
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typedef const struct gme_type_t_* gme_type_t;
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/* Emulator type constants for each supported file type */
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extern const gme_type_t
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gme_ay_type,
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gme_gbs_type,
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gme_gym_type,
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gme_hes_type,
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gme_kss_type,
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gme_nsf_type,
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gme_nsfe_type,
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gme_sap_type,
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gme_spc_type,
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gme_vgm_type,
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gme_vgz_type;
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/* Type of this emulator */
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gme_type_t gme_type( Music_Emu const* );
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/* Pointer to array of all music types, with NULL entry at end. Allows a player linked
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to this library to support new music types without having to be updated. */
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gme_type_t const* gme_type_list();
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/* Name of game system for this music file type */
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const char* gme_type_system( gme_type_t );
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/* True if this music file type supports multiple tracks */
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int gme_type_multitrack( gme_type_t );
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/******** Advanced file loading ********/
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/* Error returned if file type is not supported */
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extern const char* const gme_wrong_file_type;
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/* Same as gme_open_file(), but uses file data already in memory. Makes copy of data. */
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gme_err_t gme_open_data( void const* data, long size, Music_Emu** out, int sample_rate );
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/* Determine likely game music type based on first four bytes of file. Returns
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string containing proper file suffix (i.e. "NSF", "SPC", etc.) or "" if
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file header is not recognized. */
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const char* gme_identify_header( void const* header );
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/* Get corresponding music type for file path or extension passed in. */
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gme_type_t gme_identify_extension( const char path_or_extension [] );
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/* Determine file type based on file's extension or header (if extension isn't recognized).
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Sets *type_out to type, or 0 if unrecognized or error. */
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gme_err_t gme_identify_file( const char path [], gme_type_t* type_out );
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/* Create new emulator and set sample rate. Returns NULL if out of memory. If you only need
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track information, pass gme_info_only for sample_rate. */
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Music_Emu* gme_new_emu( gme_type_t, int sample_rate );
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/* Load music file into emulator */
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gme_err_t gme_load_file( Music_Emu*, const char path [] );
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/* Load music file from memory into emulator. Makes a copy of data passed. */
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gme_err_t gme_load_data( Music_Emu*, void const* data, long size );
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/* Load music file using custom data reader function that will be called to
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read file data. Most emulators load the entire file in one read call. */
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typedef gme_err_t (*gme_reader_t)( void* your_data, void* out, int count );
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gme_err_t gme_load_custom( Music_Emu*, gme_reader_t, long file_size, void* your_data );
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/* Load m3u playlist file from memory (must be done after loading music) */
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gme_err_t gme_load_m3u_data( Music_Emu*, void const* data, long size );
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/******** User data ********/
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/* Set/get pointer to data you want to associate with this emulator.
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You can use this for whatever you want. */
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void gme_set_user_data( Music_Emu*, void* new_user_data );
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void* gme_user_data( Music_Emu const* );
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/* Register cleanup function to be called when deleting emulator, or NULL to
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clear it. Passes user_data to cleanup function. */
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typedef void (*gme_user_cleanup_t)( void* user_data );
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void gme_set_user_cleanup( Music_Emu*, gme_user_cleanup_t func );
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#ifdef __cplusplus
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}
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#endif
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#endif
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