def test_strech_is_reversable(self):
"""
Ensure that stretch and contract is an identity operation
"""
from sebastian.core.transforms import stretch
s1 = self.make_sequence()
stretched = s1 | stretch(2) | stretch(0.5)
self.assertEqual(s1._elements, stretched._elements)
def test_strech_is_reversable(self):
"""
Ensure that stretch and contract is an identity operation
"""
from sebastian.core.transforms import stretch
s1 = self.make_sequence()
stretched = s1 | stretch(2) | stretch(0.5)
self.assertEqual(s1._elements, stretched._elements)
def chord_scaled(arr, scale, period=12):
'''
Scales an note's array
'''
remainder = arr.size % period
if remainder:
fill = period - remainder
arr = np.append(arr, np.zeros(fill) * np.nan)
arr_scaled = np.int32([np.nansum(row) / len(row)
for row in arr.reshape((-1, period))])
root_scaled = [note_on_classes(note, arr, scale) for note in arr_scaled]
root = []
third = []
fifth = []
for note in root_scaled:
root.append(note_name(note, scale))
third.append(note_name(note, scale))
fifth.append(note_name(note, scale))
seq1 = parse(" ".join(root))
seq2 = parse(" ".join(third))
seq3 = parse(" ".join(fifth))
# chords = (seq1 * period) // (seq2 * period) // (seq3 * period)
chords = seq1 // seq2 // seq3
# return (chords | add({DURATION_64: chords[0][DURATION_64] * period}))
return (chords | stretch(period))
def test_stretch(self):
"""
Ensure that strech modifies a simple sequence
"""
from sebastian.core.transforms import stretch
s1 = self.make_sequence()
streched = s1 | stretch(2)
from sebastian.core import OFFSET_64, DURATION_64, MIDI_PITCH
self.assertEqual(streched._elements, [
{MIDI_PITCH: 50, OFFSET_64: 32, DURATION_64: 34},
{MIDI_PITCH: 53, OFFSET_64: 38, DURATION_64: 40}
])
def test_stretch(self):
"""
Ensure that strech modifies a simple sequence
"""
from sebastian.core.transforms import stretch
s1 = self.make_sequence()
streched = s1 | stretch(2)
from sebastian.core import OFFSET_64, DURATION_64
self.assertEqual(streched._elements, [{
"pitch": 50,
OFFSET_64: 32,
DURATION_64: 34
}, {
"pitch": 53,
OFFSET_64: 38,
DURATION_64: 40
}])
assert s1 | transpose(5) | transpose(-5) == s1
# reverse
assert (s1 | reverse())._elements == [
{MIDI_PITCH: 52, OFFSET_64: 0, DURATION_64: 16},
{MIDI_PITCH: 50, OFFSET_64: 16, DURATION_64: 16},
{OFFSET_64: 48}
]
assert s1 | reverse() | reverse() == s1
# stretch
assert (s1 | stretch(2))._elements == [
{MIDI_PITCH: 50, OFFSET_64: 32, DURATION_64: 32},
{MIDI_PITCH: 52, OFFSET_64: 64, DURATION_64: 32}
]
assert s1 | stretch(2) | stretch(0.5) == s1
# invert
assert (s1 | invert(50))._elements == [
{DURATION_64: 16, OFFSET_64: 16, MIDI_PITCH: 50},
{DURATION_64: 16, OFFSET_64: 32, MIDI_PITCH: 48}
]
assert s1 | invert(100) | invert(100) == s1
