def merge_tracksFIXED(tracks):
"""Returns a MidiTrack object with all messages from all tracks.
The messages are returned in playback order with delta times
as if they were all in one track.
"""
now = 0 # REMOVE THIS
messages = MidiTrack()
for track in tracks:
now = 0 # ADD THIS
for message in track:
now += message.time
if message.type not in ('track_name', 'end_of_track'):
messages.append(message.copy(time=now))
if message.type == 'end_of_track':
break
messages.sort(key=lambda x: x.time)
messages.append(MetaMessage('end_of_track', time=now))
# Convert absolute time back to delta time.
last_time = 0
for message in messages:
message.time -= last_time
last_time += message.time
return messages
def to_delta_time(midi_track: MidiTrack):
"""Convert a mido MidiTrack object from absolute time to delta time.
Parameters
----------
midi_track : :class:`mido.MidiTrack` object
mido MidiTrack object to convert.
"""
# Sort messages by absolute time
midi_track.sort(key=lambda x: x.time)
# Convert to delta time
time = 0
for msg in midi_track:
time_ = msg.time
msg.time -= time
time = time_
