def random_track():
track = Track(signature=(random.randint(0, 100), 16))
for _ in range(random.randint(100, 300)):
note = Note(random.randint(-100, 100), (random.randint(0, 100), 16))
position = (random.randint(0, 10000),
random.choice([1, 2, 4, 8, 16, 32, 64, 128, 256, 512]))
track.add(note, position)
return track
def random_track_without_overlaps():
track = Track(signature=(random.randint(0, 100), 16))
p = 0
for _ in range(random.randint(100, 300)):
note = Note(random.randint(30, 90), (random.randint(0, 100), 16),
velocity=1.0)
p += 200
track.add(note, (p, 16))
return track
def test_track_add():
t = Track()
assert list(t) == []
t.add(Note(0, (1, 4)))
assert list(t) == [(Signature(0, 1), Note(0, (1, 4)))]
t.add([Note(0, (1, 4)), Note(1, (1, 4)), Note(-1, (1, 4))])
assert list(t) == [
(Signature(0, 1), Note(0, (1, 4))),
(Signature(1, 4), Note(-1, (1, 4))),
(Signature(1, 4), Note(0, (1, 4))),
(Signature(1, 4), Note(1, (1, 4))),
]
t.add(Note(42, (8, 1)), (13, 1))
assert list(t) == [(Signature(0, 1), Note(0, (1, 4))),
(Signature(1, 4), Note(-1, (1, 4))),
(Signature(1, 4), Note(0, (1, 4))),
(Signature(1, 4), Note(1, (1, 4))),
(Signature(13, 1), Note(42, (8, 1)))]
assert list(t) == [(Signature(0, 1), Note(0, (1, 4))),
(Signature(1, 4), Note(-1, (1, 4))),
(Signature(1, 4), Note(0, (1, 4))),
(Signature(1, 4), Note(1, (1, 4))),
(Signature(13, 1), Note(42, (8, 1)))]
assert list(t) == [(Signature(0, 1), Note(0, (1, 4))),
(Signature(1, 4), Note(-1, (1, 4))),
(Signature(1, 4), Note(0, (1, 4))),
(Signature(1, 4), Note(1, (1, 4))),
(Signature(13, 1), Note(42, (8, 1)))]
def randomize_velocities(track: Track,
minimum: float = 0.5,
maximum: float = 1.0,
mean: float = 0.75,
variance: float = 0.01) -> Track:
"""
Randomizes velocities of the notes in the track.
Returns copy of the provided track with randomized velocities.
:param track: input track
:param minimum: minimum velocity (default: 0.5)
:param maximum: maximum velocity (default: 1.0)
:param mean: mean velocity (default: 0.75)
:param variance: velocity variance (default: 0.01)
:return: new track with randomized velocities
"""
if not 0 <= minimum <= 1.0:
raise ValueError('minimum velocity must be in range [0.0, 1.0]')
if not 0 <= maximum <= 1.0:
raise ValueError('maximum velocity must be in range [0.0, 1.0]')
if not 0 <= mean <= 1.0:
raise ValueError('mean velocity must be in range [0.0, 1.0]')
if not variance >= 0:
raise ValueError('variance must be positive')
result = Track(signature=track.signature)
std = math.sqrt(variance)
for position, note in track:
new_velocity = max(minimum, min(maximum, random.gauss(mean, std)))
result.add(note.with_velocity(new_velocity), position)
return result
def test_track_length():
assert Track().length == Signature(0, 1)
t = Track()
t.add(Note(0, (10, 4)))
assert t.length == Signature(10, 4)
t.add(Note(0, (30, 8)), (40, 2))
assert t.length == Signature(190, 8)
t.add(Note(0, (1, 4)))
assert t.length == Signature(192, 8)