def write_midi(self,
score_events,
midi_program,
pitch_low_passband=0,
pitch_high_passband=127,
time_offset=0.0):
"""
Given a sequence of NoteEvents, calculate the MIDI ticks for each note and write these to a MIDI file.
PARAMETERS:
score_events (list): list of ScoreEvents
midi_program (int): MIDI program to use for the MIDI track
pitch_low_passband (int): discard any pitches with midi numbers less than this bound
pitch_high_passband (int): discard any pitches with midi numbers greater than this bound
time_offset (float): amount of time (s) to delay MIDI note events
"""
midi = PrettyMIDI(resolution=MidiIO.DEFAULT_PPQ,
initial_tempo=MidiIO.DEFAULT_TEMPO)
instr = Instrument(program=midi_program)
for e in score_events:
for n in e.underlying_events():
if pitch_low_passband <= n.midi_number <= pitch_high_passband:
note = MidiNote(velocity=MidiIO.DEFAULT_VELOCITY,
pitch=n.midi_number,
start=(n.onset_ts + time_offset),
end=(n.offset_ts + time_offset))
instr.notes.append(note)
midi.instruments.append(instr)
midi.remove_invalid_notes()
directory = os.path.split(self._path)[0]
if not os.path.exists(directory):
os.makedirs(directory)
midi.write(self._path)
def write_midi(self, score_events, midi_program, pitch_low_passband=0, pitch_high_passband=127, time_offset=0.0):
"""
Given a sequence of NoteEvents, calculate the MIDI ticks for each note and write these to a MIDI file.
PARAMETERS:
score_events (list): list of ScoreEvents
midi_program (int): MIDI program to use for the MIDI track
pitch_low_passband (int): discard any pitches with midi numbers less than this bound
pitch_high_passband (int): discard any pitches with midi numbers greater than this bound
time_offset (float): amount of time (s) to delay MIDI note events
"""
midi = PrettyMIDI(resolution=MidiIO.DEFAULT_PPQ, initial_tempo=MidiIO.DEFAULT_TEMPO)
instr = Instrument(program=midi_program)
for n in score_events:
if pitch_low_passband <= n.midi_number <= pitch_high_passband:
note = MidiNote(
velocity=MidiIO.DEFAULT_VELOCITY, pitch=n.midi_number,
start=(n.onset_ts + time_offset), end=(n.offset_ts + time_offset)
)
instr.notes.append(note)
midi.instruments.append(instr)
midi.remove_invalid_notes()
directory = os.path.split(self._path)[0]
if not os.path.exists(directory):
os.makedirs(directory)
midi.write(self._path)
def __init__(self, path):
pm = PrettyMIDI(path)
pm.remove_invalid_notes()
self.midi = pm
self.tempo = pm.estimate_tempo()
self.beat_times = pm.get_beats()
self.bar_times = pm.get_downbeats()
self.end_time = pm.get_end_time()
self.instruments = pm.instruments
def parse_midi(self,
pitch_low_passband=0,
pitch_high_passband=127,
time_offset=0.0):
"""
Parse the binary MIDI file (@self._path) and convert to list of notes with
pitch, onset, and offset times in seconds.
Note: only uses the first track in the MIDI file.
PARAMETERS:
pitch_low_passband (int): discard any pitches with midi numbers less than this bound
pitch_high_passband (int): discard any pitches with midi numbers greater than this bound
time_offset (float): amount of time (s) to delay MIDI note events
RETURNS:
notes (list of NoteEvents)
"""
midi = PrettyMIDI(self._path)
midi.remove_invalid_notes()
notes = []
if len(midi.instruments):
for midi_n in midi.instruments[0].notes:
if pitch_low_passband <= midi_n.pitch <= pitch_high_passband:
pname, octave = Note.midi_to_pitch(midi_n.pitch)
note = Note(
pname,
octave,
onset_ts=(midi_n.start + time_offset),
offset_ts=(midi_n.end + time_offset),
)
note.onset_tick = midi.time_to_tick(note.onset_ts)
note.offset_tick = midi.time_to_tick(note.offset_ts)
notes.append(note)
return notes