def test_meta_messages_with_length_0():
"""sequence_number and midi_port with no data bytes should be accepted.
In rare cases these messages have length 0 and thus no data
bytes. (See issues 42 and 93.) It is unclear why these messages
are missing their data. It could be cased by a bug in the software
that created the files.
So far this has been fixed by adding a test to each of these two
meta message classes. If the problem appears with other message
types it may be worth finding a more general solution.
"""
mid = read_file(HEADER_ONE_TRACK + """
4d 54 72 6b # MTrk
00 00 00 17
00 ff 00 00 # sequence_number with no data bytes (should be 2).
00 ff 21 00 # midi_port with no data bytes (should be 1).
00 ff 00 02 00 01 # sequence_number with correct number of data bytes (2).
00 ff 21 01 01 # midi_port with correct number of data bytes (1).
00 ff 2f 00
""")
assert mid.tracks[0] == [
MetaMessage('sequence_number', number=0),
MetaMessage('midi_port', port=0),
MetaMessage('sequence_number', number=1),
MetaMessage('midi_port', port=1),
MetaMessage('end_of_track'),
]
def test_track_name():
name1 = MetaMessage('track_name', name='name1')
name2 = MetaMessage('track_name', name='name2')
# The track should use the first name it finds.
track = MidiTrack([name1, name2])
assert track.name == name1.name
def test_meta_messages():
# TODO: should this raise IOError?
mid = read_file(HEADER_ONE_TRACK + """
4d 54 72 6b # MTrk
00 00 00 0c # Chunk size
00 ff 03 04 54 65 73 74 # track_name name='Test'
00 ff 2f 00 # end_of_track
""")
track = mid.tracks[0]
assert track[0] == MetaMessage('track_name', name='Test')
assert track[1] == MetaMessage('end_of_track')
def merge_tracks(self, tracks, ticks_per_beat):
"""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.
"""
messages = []
for track in tracks:
messages.extend(_to_abstime(track))
aux_msgs = list()
print("Preload amt {} and common tone {}".format(self.preload_chord_amt, self.common_chord_tone_amt))
for msg in messages:
if (self.preload_chord_amt > 0.0 or self.common_chord_tone_amt > 0.0) and msg.type == 'lyrics' and msg.time >= ticks_per_beat * self.preload_chord_amt: # push lyrics back a bit
if self.common_chord_tone_amt > 0.0:
m = MetaMessage(type='marker', time = msg.time - ticks_per_beat*self.common_chord_tone_amt, text=msg.text)
aux_msgs.append(m)
if self.preload_chord_amt > 0.0:
msg.time -= ticks_per_beat * self.preload_chord_amt
messages += aux_msgs
messages.sort(key=lambda msg: msg.time)
return MidiTrack(fix_end_of_track(_to_reltime(messages)))
def test_midifile_repr():
midifile = MidiFile(type=1, ticks_per_beat=123, tracks=[
MidiTrack([
Message('note_on', channel=1, note=2, time=3),
Message('note_off', channel=1, note=2, time=3)]),
MidiTrack([
MetaMessage('sequence_number', number=5),
Message('note_on', channel=2, note=6, time=9),
Message('note_off', channel=2, note=6, time=9)]),
])
midifile_eval = eval(repr(midifile))
for track, track_eval in zip(midifile.tracks, midifile_eval.tracks):
for m1, m2 in zip(track, track_eval):
assert m1 == m2
def test_copy_cant_override_type():
with pytest.raises(ValueError):
MetaMessage('track_name').copy(type='end_of_track')
def test_copy_invalid_argument():
with pytest.raises(ValueError):
MetaMessage('track_name').copy(a=1)
def test_meta_message_repr():
msg = MetaMessage('end_of_track', time=10)
msg_eval = eval(repr(msg))
assert msg == msg_eval
def test_key_signature(self, input_bytes, expect_sig):
msg = MetaMessage('key_signature')
MetaSpec_key_signature().decode(msg, input_bytes)
assert msg.key == expect_sig
def test_bad_key_sig_throws_key_signature_error(self, bad_key_sig):
with pytest.raises(KeySignatureError):
MetaSpec_key_signature().decode(MetaMessage('key_signature'),
bad_key_sig)