238 lines
9.2 KiB
C
238 lines
9.2 KiB
C
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#ifndef cwMidiFile_h
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#define cwMidiFile_h
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namespace cw
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{
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namespace midi
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{
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namespace file
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{
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// MIDI file timing:
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// Messages in the MIDI file are time tagged with a delta offset in 'ticks'
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// from the previous message in the same track.
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//
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// A 'tick' can be converted to microsends as follows:
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//
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// microsecond per tick = micros per quarter note / ticks per quarter note
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//
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// MpT = MpQN / TpQN
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//
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// TpQN is given as a constant in the MIDI file header.
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// MpQN is given as the value of the MIDI file tempo message.
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//
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// See seekUSecs() for an example of converting ticks to milliseconds.
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//
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// Notes:
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// As part of the file reading process, the status byte of note-on messages
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// with velocity=0 are is changed to a note-off message. See _readChannelMsg().
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typedef struct
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{
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uint8_t hr;
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uint8_t min;
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uint8_t sec;
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uint8_t frm;
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uint8_t sfr;
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} smpte_t;
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typedef struct
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{
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uint8_t num;
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uint8_t den;
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uint8_t metro;
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uint8_t th2s;
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} timeSig_t;
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typedef struct
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{
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uint8_t key;
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uint8_t scale;
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} keySig_t;
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struct midiTrackMsg_str;
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typedef struct
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{
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uint8_t ch;
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uint8_t d0;
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uint8_t d1;
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unsigned durMicros; // note duration in microseconds (corrected for tempo changes)
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struct trackMsg_str* end; // note-off or pedal-up message
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} chMsg_t;
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enum
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{
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kDropTrkMsgFl = 0x01
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};
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typedef struct trackMsg_str
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{
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unsigned flags; // see k???TrkMsgFl
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unsigned uid; // uid's are unique among all msg's in the file
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unsigned dtick; // delta ticks between events on this track (ticks between this event and the previous event on this track)
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unsigned long long atick; // global (all tracks interleaved) accumulated ticks
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unsigned long long amicro; // global (all tracks interleaved) accumulated microseconds adjusted for tempo changes
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uint8_t status; // ch msg's have the channel value removed (it is stored in u.chMsgPtr->ch)
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uint8_t metaId; //
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unsigned short trkIdx; //
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unsigned byteCnt; // length of data pointed to by u.voidPtr (or any other pointer in the union)
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struct trackMsg_str* link; // link to next record in this track
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union
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{
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uint8_t bVal;
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unsigned iVal;
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unsigned short sVal;
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const char* text;
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const void* voidPtr;
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const smpte_t* smptePtr;
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const timeSig_t* timeSigPtr;
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const keySig_t* keySigPtr;
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const chMsg_t* chMsgPtr;
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const uint8_t* sysExPtr;
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} u;
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} trackMsg_t;
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inline bool isNoteOn(const trackMsg_t* m) { return midi::isNoteOn(m->status) && (m->u.chMsgPtr->d1>0); }
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inline bool isNoteOff(const trackMsg_t* m) { return midi::isNoteOff(m->status,m->u.chMsgPtr->d1); }
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inline bool isPedalUp(const trackMsg_t* m) { return midi::isPedalUp( m->status, m->u.chMsgPtr->d0, m->u.chMsgPtr->d1); }
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inline bool isPedalDown(const trackMsg_t* m) { return midi::isPedalDown( m->status, m->u.chMsgPtr->d0, m->u.chMsgPtr->d1); }
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inline bool isSustainPedalUp(const trackMsg_t* m) { return midi::isSustainPedalUp( m->status,m->u.chMsgPtr->d0,m->u.chMsgPtr->d1); }
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inline bool isSustainPedalDown(const trackMsg_t* m) { return midi::isSustainPedalDown( m->status,m->u.chMsgPtr->d0,m->u.chMsgPtr->d1); }
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inline bool isSostenutoPedalUp(const trackMsg_t* m) { return midi::isSostenutoPedalUp( m->status,m->u.chMsgPtr->d0,m->u.chMsgPtr->d1); }
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inline bool isSostenutoPedalDown(const trackMsg_t* m) { return midi::isSostenutoPedalDown(m->status,m->u.chMsgPtr->d0,m->u.chMsgPtr->d1); }
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typedef handle<struct file_str> handle_t;
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// Read a MIDI file.
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rc_t open( handle_t& hRef, const char* fn );
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// Create an empty MIDI file object.
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rc_t create( handle_t& hRef, unsigned trkN, unsigned ticksPerQN );
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// Release all resources associated with this MIDI file object
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rc_t close( handle_t& hRef );
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// Write this MIDI file to the specified file.
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rc_t write( handle_t h, const char* fn );
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// Return midi file format id (0,1,2) or kInvalidId if 'h' is invalid.
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unsigned fileType( handle_t h );
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// Returns ticks per quarter note or kInvalidMidiByte if 'h' is
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// invalid or 0 if file uses SMPTE ticks per frame time base.
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unsigned ticksPerQN( handle_t h );
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// The file name used in an earlier call to midiFileOpen() or NULL if this
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// midi file did not originate from an actual file.
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const char* filename( handle_t h );
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// Returns SMPTE ticks per frame or kInvalidMidiByte if 'h' is
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// invalid or 0 if file uses ticks per quarter note time base.
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uint8_t ticksPerSmpteFrame( handle_t h );
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// Returns SMPTE format or kInvalidMidiByte if 'h' is invalid or 0
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// if file uses ticks per quarter note time base.
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uint8_t smpteFormatId( handle_t h );
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// Return the count of tracks in the file.
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unsigned trackCount( handle_t h );
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// Returns count of records in track 'trackIdx' or kInvalidCnt if 'h' is invalid.
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unsigned trackMsgCount( handle_t h, unsigned trackIdx );
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// Returns base of record chain from track 'trackIdx' or NULL if 'h' is invalid.
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const trackMsg_t* trackMsg( handle_t h, unsigned trackIdx );
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// Returns the total count of records in the midi file and the
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// number in the array returned by cmMidiFileMsgArray().
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// Return kInvalidCnt if 'h' is invalid.
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unsigned msgCount( handle_t h );
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// Returns a pointer to the base of an array of pointers to all records
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// in the file sorted in ascending time order.
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// Returns NULL if 'h' is invalid.
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const trackMsg_t** msgArray( handle_t h );
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// Set the velocity of a note-on/off msg identified by 'uid'.
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rc_t setVelocity( handle_t h, unsigned uid, uint8_t vel );
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// Insert a MIDI message relative to the reference msg identified by 'uid'.
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// If dtick is positive/negative then the new msg is inserted after/before the reference msg.
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rc_t insertMsg( handle_t h, unsigned uid, int dtick, uint8_t ch, uint8_t status, uint8_t d0, uint8_t d1 );
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//
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// Insert a new trackMsg_t into the MIDI file on the specified track.
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//
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// Only the following fields need be set in 'msg'.
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// atick - used to position the msg in the track
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// status - this field is always set (Note that channel information must stripped from the status byte and included in the channel msg data)
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// metaId - this field is optional depending on the msg type
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// byteCnt - used to allocate storage for the data element in 'trackMsg_t.u'
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// u - the message data
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//
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rc_t insertTrackMsg( handle_t h, unsigned trkIdx, const trackMsg_t* msg );
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rc_t insertTrackChMsg( handle_t h, unsigned trkIdx, unsigned atick, uint8_t status, uint8_t d0, uint8_t d1 );
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rc_t insertTrackTempoMsg( handle_t h, unsigned trkIdx, unsigned atick, unsigned bpm );
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// Return a pointer to the first msg at or after 'usecsOffs' or kInvalidIdx if no
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// msg exists after 'usecsOffs'. Note that 'usecOffs' is an offset from the beginning
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// of the file.
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// On return *'msgUsecsPtr' is set to the actual time of the msg.
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// (which will be equal to or greater than 'usecsOffs').
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unsigned seekUsecs( handle_t h, unsigned long long usecsOffs, unsigned* msgUsecsPtr, unsigned* newMicrosPerTickPtr );
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double durSecs( handle_t h );
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// Calculate Note Duration
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enum { kWarningsMfFl=0x01, kDropReattacksMfFl=0x02 };
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void calcNoteDurations( handle_t h, unsigned flags );
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// Set the delay prior to the first non-zero msg.
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void setDelay( handle_t h, unsigned ticks );
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void printMsgs( handle_t h, log::handle_t logH );
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void printTrack( handle_t h, unsigned trkIdx, log::handle_t logH );
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typedef struct
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{
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unsigned uid;
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unsigned long long amicro;
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unsigned density;
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} density_t;
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// Generate the note onset density measure for each note in the MIDI file.
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// Delete the returned memory with a call to cmMemFree().
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density_t* noteDensity( handle_t h, unsigned* cntRef );
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// Generate a piano-roll plot description file which can be displayed with cmXScore.m
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rc_t genPlotFile( const char* midiFn, const char* outFn );
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rc_t genSvgFile(const char* midiFn, const char* outSvgFn, const char* cssFn, bool standAloneFl, bool panZoomFl );
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rc_t genCsvFile( const char* midiFn, const char* csvFn );
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// Generate a text file reportusing cmMIdiFilePrintMsgs()
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rc_t report( const char* midiFn, log::handle_t logH );
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void printControlNumbers( const char* midiFileName );
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rc_t test( const object_t* cfg );
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}
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}
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}
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#endif
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