def split_in_half(mid, verbose=True, write_to_file=False):
mid = parse_mid(mid)
if mid.type != 0:
print("Wrong Midi file type. I did not dare to change anything.".format(mid.type))
return None
ticks = 0
flat_track = MidiTrack()
for msg in mid.tracks[0]:
ticks += msg.time
if verbose:
print("Original Length in ticks".format(ticks))
half = int(ticks / 2)
dur = 0
for msg in mid.tracks[0]:
if dur < half:
flat_track.append(msg)
dur += msg.time
if flat_track[-1].type == 'note_on':
flat_track.pop(-1)
flat_track.append(MetaMessage("end_of_track", time=0))
# replace the 'tracks' field with a single track containing all the messages.
# later on we can check for duplicates in certain fields (tempo, timesignature, key)
mid.tracks.clear()
mid.type = 0
mid.tracks.append(flat_track)
if write_to_file:
mid.save(mid)
if verbose:
print("Overwriting midifile with changes.")
return mid
velocity=90,
time=round(0.96 * meta_time * length),
channel=channel))
track.append(
Message('note_on',
note=base_note + base_num * 12 + sum(major_notes[0:2]),
velocity=90,
time=round(delay * meta_time),
channel=channel))
track.append(
Message('note_off',
note=base_note + base_num * 12 + sum(major_notes[0:2]),
velocity=90,
time=round(0.96 * meta_time * length),
channel=channel))
track.pop()
track.pop()
track.append(
Message('note_off',
note=base_note + base_num * 12 + sum(major_notes[0:2]),
velocity=90,
time=round(0.96 * meta_time * length),
channel=channel))
track.append(
Message('note_on',
note=base_note + base_num * 12 + sum(major_notes[0:3]),
velocity=90,
time=round(delay * meta_time),
channel=channel))
track.append(
Message('note_off',
def output_to_midi(ml_arr, filepath, barlength, channels, file_name):
channel = 0
mid = MidiFile(filepath)
for i in range(15):
if i not in channels:
channel = i
break
time = 0
index = 0
output_file = MidiFile(type=0)
track = MidiTrack()
output_file.tracks.append(track)
nextBarStart = barlength
firstMessage = True
output_file.ticks_per_beat = mid.ticks_per_beat
for i, t in enumerate(mid.tracks):
print('Track {}: {}'.format(i, track.name))
for msg in t:
old_time = time
time += msg.time
if not msg.is_meta:
if (firstMessage):
firstMessage = False
for note in arr_to_chord(ml_arr[index]):
track.append(
Message('note_on',
channel=channel,
note=note,
time=0))
track.append(msg)
continue
# if (index < len(ml_arr)):
while (time >= nextBarStart and index < len(ml_arr)):
msgs_to_add = []
for note in arr_to_chord(ml_arr[index]):
msgs_to_add.append(
Message('note_off', channel=channel, note=note,
time=0))
index += 1
if (index < len(ml_arr)):
for note in arr_to_chord(ml_arr[index]):
msgs_to_add.append(
Message('note_on',
channel=channel,
note=note,
time=0))
if (nextBarStart - old_time >= 0
and nextBarStart - old_time < barlength):
msgs_to_add[0].time = nextBarStart - old_time
else:
msgs_to_add[0].time = barlength
for m in msgs_to_add:
track.append(m)
msg.time = time - nextBarStart
nextBarStart += barlength
track.append(msg)
# else:
# track.append(msg)
m = track.pop(-1)
for note in arr_to_chord(ml_arr[-1]):
track.append(
Message('note_off', channel=channel, note=note, time=0))
track.append(m)
output_file.save(default_storage.path('tmp/' + file_name))
file_full_path = default_storage.path('tmp/' + file_name)
return file_name
