def save_midi_file(self):
if len(self.messages_captured) == 0:
return
my_midi = MIDIFile(2)
track = 0
my_midi.addTrackName(track, 0, "Tempo track")
my_midi.addTempo(track, 0, self.bpm)
track += 1
my_midi.addTrackName(track, 0, "Song track")
total_time = 0
midi_messages_on = []
midi_messages_off = []
midi_messages_controller = []
for message in self.messages_captured:
if len(message) != 3:
self.write_message("wrong length: skipping " + str(message))
continue
total_time += message.time_stamp
# seconds -> beat conversion
total_time_adjusted = total_time * float(self.bpm) / float(60)
if message.type == MidiEventTypes.NOTE_ON:
midi_messages_on.append(
{'note': message[1], 'velocity': message[2], 'time': total_time_adjusted, 'channel': message.channel})
elif message.type == MidiEventTypes.NOTE_OFF:
midi_messages_off.append(
{'note': message[1], 'velocity': message[2], 'time': total_time_adjusted, 'channel': message.channel})
elif message.type == MidiEventTypes.CONTROL_CHANGE:
midi_messages_controller.append(
{'type': message[1], 'value': message[2], 'time': total_time_adjusted, 'channel': message.channel})
else:
self.write_message("unknown message: skipping " + str(message))
continue
for m_on in midi_messages_on:
for m_off in midi_messages_off:
if m_off['note'] == m_on['note'] and m_off['time'] > m_on['time']:
m_on['duration'] = m_off['time'] - m_on['time']
m_off['note'] = -1
break
else:
m_on['duration'] = float(
15) * float(self.bpm) / float(60) # suspended
for m in midi_messages_on:
my_midi.addNote(
track, m['channel'], m['note'], m['time'], m['duration'], m['velocity'])
for m in midi_messages_controller:
my_midi.addControllerEvent(
track, m['channel'], m['time'], m['type'], m['value'])
file_name = self.midi_file_name.format(
datetime.datetime.now().strftime("%Y%m%d-%H%M%S"))
file_path = os.path.join(os.path.dirname(sys.argv[0]), file_name)
self.write_message("Saving {0} MIDI messages to {1}...".format(
len(self.messages_captured), file_name))
binfile = open(file_path, 'wb')
my_midi.writeFile(binfile)
binfile.close()
self.messages_captured = []
self.write_message("Saved.")
