def write_file(filename, chords):
"""
Writes a midi file of the given file name from the list of chords given.
"""
midi = MidiOutFile(open(filename, 'wb'))
midi.header(format=0, nTracks=12, division=16)
midi.start_of_track()
time = 0
prevBass = 0
prevChord = []
for i in range(len(chords)):
c = str_to_pitches(chords[i], prevBass)
nextChord = [] if i + 1 >= len(chords) else str_to_pitches(
chords[i + 1], c[0] if len(c) > 0 else 0)
for n in c:
if n not in prevChord:
midi.update_time(time, relative=False)
midi.note_on(0, n, V)
time += 8
for n in c:
if n not in nextChord:
midi.update_time(time, relative=False)
midi.note_off(0, n, V)
prevBass = c[0] if len(c) > 0 else 0
prevChord = c
midi.update_time(0)
midi.end_of_track()
def note_on(self,
channel=0,
note=0x40,
velocity=0x40,
use_running_status=False):
note = self._transp(channel, note)
MidiOutFile.note_on(self, channel, note, velocity, use_running_status)
def write_midi_sequence(midi_file,sequence):
QUARTER = 480
BAR = QUARTER*4
GRAND_PIANO = 0
out_file = open(midi_file, 'wb')
midi = MidiOutFile(out_file)
midi.header(format=1, nTracks=2, division=QUARTER)
##########################
# track 0
# in type 1 midi files first track MUST be a timing and tempo track
# and no musical events are allowed.
midi.start_of_track()
midi.sequence_name(b'Timing track')
midi.time_signature(nn=4, dd=2, cc=24, bb=8) # optional
midi.tempo_bpm(135)
midi.end_of_track()
##########################
# track 1
CH = 0
midi.start_of_track()
midi.patch_change(CH, GRAND_PIANO)
midi.sequence_name(b'piano roll %i' % CH)
midi.update_time(0)
# go trough all notes in 'sequence' and add them to the track
for NOTE in sequence.split( ):
midi.note_on(CH, int(NOTE), 0x64)
midi.update_time(int(BAR/4)) # how much to sustain a note
midi.note_off(CH, int(NOTE), 0x40)
midi.update_time(int(QUARTER/2)) # how much time to wait between notes
midi.update_time(BAR*4)
midi.update_time(0)
midi.end_of_track()
def make_midi(melody, file):
out_file = open(f"./output/{file}.midi", 'wb')
midi = MidiOutFile(out_file)
midi.header(format=0, nTracks=1, division=32)
midi.start_of_track()
# print(f"Midi_notes: {melody}")
try:
for note, duration in melody:
if note is 0: # if it is a pause
midi.note_on(channel=0, note=0)
midi.update_time(0)
midi.note_off(channel=0, note=0)
midi.update_time(duration)
midi.note_on(channel=0, note=0)
midi.update_time(0)
midi.note_off(channel=0, note=0)
midi.update_time(0)
else:
midi.update_time(0)
if isinstance(note,
list): # checks if note is single, or chord
for n in note:
midi.note_on(channel=0, note=n)
else:
midi.note_on(channel=0, note=note)
midi.update_time(duration)
if isinstance(note, list):
for n in note:
midi.note_off(channel=0, note=n)
else:
# if note is not 0:
midi.note_off(channel=0, note=note)
midi.update_time(0)
midi.end_of_track()
except:
return False
return True
# in type 0 midi files there is only one track.
# there can be different midi channels in the same track, mo matter
# the type of midi file
out_file = open(exampledir('midi-out/mxm_midifile_type_0_minimal.mid'), 'wb')
midi = MidiOutFile(out_file)
midi.header(format=0, nTracks=1, division=QUARTER)
#####################
# track 0 begin
midi.start_of_track()
midi.tempo_bpm(135)
midi.time_signature(nn=4, dd=2, cc=24, bb=8)
midi.patch_change(0, GRAND_PIANO)
# note on
midi.update_time(0)
midi.note_on(0, NOTE, 0x64)
# note off one bar later
midi.update_time(BAR)
midi.note_off(0, NOTE, 0x40)
midi.update_time(0)
midi.end_of_track()
# track 0 end
#####################
})
notes.sort(key=lambda x: x['time'])
out_file = open(exampledir('midi-out/mxm_midifile_type_0_8ch_random.mid'),
'wb')
midi = MidiOutFile(out_file)
midi.header(format=0, nTracks=1, division=QUARTER)
#####################
# track 0 begin
midi.start_of_track()
midi.tempo_bpm(135)
midi.time_signature(nn=4, dd=2, cc=24, bb=8)
for ch in range(8):
midi.patch_change(ch, GRAND_PIANO)
for note in notes:
midi.update_time(note['time'], relative=False)
if note['type'] == 'note_on':
midi.note_on(note['channel'], note['pitch'], note['velocity'])
else:
midi.note_off(note['channel'], note['pitch'], note['velocity'])
midi.update_time(0)
midi.end_of_track()
# track 0 end
#####################
midi = MidiOutFile(out_file) midi.header(format=1, nTracks=2, division=QUARTER) ########################## # track 0 # in type 1 midi files first track MUST be a timing and tempo track # and no musical events are allowed. midi.start_of_track() midi.sequence_name(b'Timing track') midi.time_signature(nn=4, dd=2, cc=24, bb=8) # optional midi.tempo_bpm(135) midi.end_of_track() ########################## # track 1 CH = 0 midi.start_of_track() midi.patch_change(CH, GRAND_PIANO) midi.sequence_name(b'piano roll %i' % CH) midi.update_time(0) midi.note_on(CH, NOTE, 0x64) midi.update_time(BAR) midi.note_off(CH, NOTE, 0x40) midi.update_time(0) midi.end_of_track()