def next(self, length):
self.note.reset()
self.duration.reset()
self.velocity.reset()
try:
self.rest.reset()
except Exception as e:
print e
print 'no rest to reset'
seq = OSequence()
total_length = 0
while total_length < length:
next = self.note.next()
next_duration = self.duration.next()
next_rest = self.rest.next()
if total_length+next_duration+next_rest > length:
#if there isn't time for this note, fill the rest of the time with silence
#print "fill"+str(total_length)
duration_left = length - total_length
next.update({DURATION_64: duration_left, OFFSET_64: total_length, "velocity": 0})
else:
#print "add"+str(total_length)
next.update({DURATION_64: next_duration, OFFSET_64: total_length, "velocity": self.velocity.next()})
total_length += next_duration+next_rest
seq.append(next)
#print 'made it'
self.last = seq
return self.last
def test_sequence_last_point_empty(self):
"""
Ensure OSequence.last_point doesn't barf when the sequence is empty
"""
from sebastian.core import OSequence
from sebastian.core import OFFSET_64, DURATION_64
sequence = OSequence([])
self.assertEqual(sequence.last_point(), {DURATION_64: 0, OFFSET_64: 0})
def test_sequence_last_point_empty(self):
"""
Ensure OSequence.last_point doesn't barf when the sequence is empty
"""
from sebastian.core import OSequence
from sebastian.core import OFFSET_64, DURATION_64
sequence = OSequence([])
self.assertEqual(sequence.last_point(), {
DURATION_64: 0, OFFSET_64: 0
})
def test_sequence_last_point(self):
"""
Ensure that OSequence.last_point returns the highest offset note
"""
points = [self.make_point(offset=x) for x in range(100, -1, -10)]
from sebastian.core import OSequence
from sebastian.core import OFFSET_64, MIDI_PITCH, DURATION_64
sequence = OSequence(points)
self.assertEqual(sequence.last_point(), {
DURATION_64: 17 + 100, OFFSET_64: 16 + 100, MIDI_PITCH: 50 + 100
})
def test_sequence_last_point(self):
"""
Ensure that OSequence.last_point returns the highest offset note
"""
points = [self.make_point(offset=x) for x in range(100, -1, -10)]
from sebastian.core import OSequence
from sebastian.core import OFFSET_64, MIDI_PITCH, DURATION_64
sequence = OSequence(points)
self.assertEqual(sequence.last_point(), {
DURATION_64: 17 + 100,
OFFSET_64: 16 + 100,
MIDI_PITCH: 50 + 100
})
def _(sequence):
new_elements = []
last_offset = sequence.next_offset()
if sequence and sequence[0][OFFSET_64] != 0:
old_sequence = OSequence([Point({OFFSET_64: 0})]) + sequence
else:
old_sequence = sequence
for point in old_sequence:
new_point = Point(point)
new_point[OFFSET_64] = last_offset - new_point[
OFFSET_64] - new_point.get(DURATION_64, 0)
if new_point != {OFFSET_64: 0}:
new_elements.append(new_point)
return OSequence(sorted(new_elements, key=lambda x: x[OFFSET_64]))
class SebastianHandler(BaseHandler):
def header(self, format, num_tracks, division):
self.division = division
self.tracks = [None] * num_tracks
def track_start(self, track_num):
self.current_sequence = OSequence()
self.tracks[track_num] = self.current_sequence
def note(self, offset, channel, midi_pitch, duration):
offset_64 = 16 * offset // self.division
duration_64 = 16 * duration // self.division
point = Point({OFFSET_64: offset_64, MIDI_PITCH: midi_pitch, DURATION_64: duration_64})
self.current_sequence.append(point)
def test_velocity_from_note_with_invalid_velocities(self):
from sebastian.core import OSequence, Point
from sebastian.core import OFFSET_64, MIDI_PITCH, DURATION_64
test = OSequence([
Point({
OFFSET_64: o,
MIDI_PITCH: m,
DURATION_64: d
}) for (o, m, d) in [(0, 60, 16), (16, 72, 16), (32, 64, 16)]
])
test[0]['velocity'] = -1
test[1]['velocity'] = 300
from sebastian.midi.write_midi import SMF
from io import BytesIO
out_fd = BytesIO(bytearray())
expected_bytes = b'MThd\x00\x00\x00\x06\x00\x01\x00\x02\x00\x10MTrk\x00\x00\x00&\x00\xffX\x04\x04\x02\x18\x08\x00\xffY\x02\x00\x00\x00\xffQ\x03\x07\xa1 \x00\xff\x03\ttest song\x00\xff/\x00MTrk\x00\x00\x00\x1f\x00\xc0\x00\x00\x90<\x00\x10\x80<\x00\x00\x90H\xff\x10\x80H\x00\x00\x90@@\x10\x80@\x00\x00\xff/\x00'
s = SMF([test])
s.write(out_fd, title="test song")
actual_bytes = out_fd.getvalue()
self.assertEqual(expected_bytes, actual_bytes)
def one_file():
seq = OSequence([])
for num, pattern in enumerate(patterns):
seq = seq + parse(pattern) * 10
f = open("in_c_all.mid", "w")
s = SMF([seq])
s.write(f)
f.close()
class SebastianHandler(BaseHandler):
def header(self, format, num_tracks, division):
self.division = division
self.tracks = [None] * num_tracks
def track_start(self, track_num):
self.current_sequence = OSequence()
self.tracks[track_num] = self.current_sequence
def note(self, offset, channel, midi_pitch, duration):
offset_64 = 16 * offset // self.division
duration_64 = 16 * duration // self.division
point = Point({
OFFSET_64: offset_64,
MIDI_PITCH: midi_pitch,
DURATION_64: duration_64
})
self.current_sequence.append(point)
def test_write_midi_multi_tacks(self):
"""
Writing out test.mid to ensure midi processing works.
This isn't really a test.
"""
from sebastian.core import OSequence, Point
from sebastian.core import OFFSET_64, MIDI_PITCH, DURATION_64
test1 = OSequence([
Point({
OFFSET_64: o,
MIDI_PITCH: m,
DURATION_64: d
}) for (o, m, d) in [
(0, 60, 16),
(16, 72, 16),
(32, 64, 16),
(48, 55, 16),
]
])
test2 = OSequence([
Point({
OFFSET_64: o,
MIDI_PITCH: m,
DURATION_64: d
}) for (o, m, d) in [
(0, 55, 16),
(16, 55, 16),
(32, 64, 16),
(48 + 16, 55, 16 * 10),
]
])
from sebastian.midi.write_midi import SMF
from io import BytesIO
out_fd = BytesIO(bytearray())
expected_bytes = b"""MThd\x00\x00\x00\x06\x00\x01\x00\x03\x00\x10MTrk\x00\x00\x00&\x00\xffX\x04\x04\x02\x18\x08\x00\xffY\x02\x00\x00\x00\xffQ\x03\x07\xa1 \x00\xff\x03\ttest song\x00\xff/\x00MTrk\x00\x00\x00'\x00\xc0\x00\x00\x90<@\x10\x80<\x00\x00\x90H@\x10\x80H\x00\x00\x90@@\x10\x80@\x00\x00\x907@\x10\x807\x00\x00\xff/\x00MTrk\x00\x00\x00(\x00\xc1\x10\x00\x917@\x10\x817\x00\x00\x917@\x10\x817\x00\x00\x91@@\x10\x81@\x00\x10\x917@\x81 \x817\x00\x00\xff/\x00"""
s = SMF([test1, test2], instruments=[0, 16])
s.write(out_fd, title="test song")
actual_bytes = out_fd.getvalue()
self.assertEqual(expected_bytes, actual_bytes)
def performance():
tracks = []
for track_num in range(8): # 8 tracks
seq = OSequence([])
for pattern in patterns:
seq += parse(pattern) * random.randint(2, 5) # repeat 2-5 times
tracks.append(seq | transpose(random.choice([-12, 0, 12]))) # transpose -1, 0 or 1 octaves
f = open("in_c_performance.mid", "w")
s = SMF(tracks)
s.write(f)
f.close()
def test_write_midi(self):
"""
Writing out test.mid to ensure midi processing works.
This isn't really a test.
"""
from sebastian.core import OSequence, Point
from sebastian.core import OFFSET_64, MIDI_PITCH, DURATION_64
test = OSequence([
Point({
OFFSET_64: o,
MIDI_PITCH: m,
DURATION_64: d
})
for (o, m,
d) in [(0, 60,
16), (16, 72,
16), (32, 64,
16), (48, 55,
16), (64, 74,
16), (80, 62,
16), (96, 50,
16), (112, 48,
16),
(128, 36,
16), (144, 24,
16), (160, 40,
16), (176, 55,
16), (192, 26,
16), (208, 38,
16), (224, 50,
16), (240, 48,
16)]
])
from sebastian.midi.write_midi import SMF
from io import BytesIO
out_fd = BytesIO(bytearray())
expected_bytes = b'MThd\x00\x00\x00\x06\x00\x01\x00\x02\x00\x10MTrk\x00\x00\x00%\x00\xffX\x04\x04\x02\x18\x08\x00\xffY\x02\x00\x00\x00\xffQ\x03\x07\xa1 \x00\xff\x03\x08untitled\x00\xff/\x00MTrk\x00\x00\x00\x87\x00\xc0\x00\x00\x90<@\x10\x80<\x00\x00\x90H@\x10\x80H\x00\x00\x90@@\x10\x80@\x00\x00\x907@\x10\x807\x00\x00\x90J@\x10\x80J\x00\x00\x90>@\x10\x80>\x00\x00\x902@\x10\x802\x00\x00\x900@\x10\x800\x00\x00\x90$@\x10\x80$\x00\x00\x90\x18@\x10\x80\x18\x00\x00\x90(@\x10\x80(\x00\x00\x907@\x10\x807\x00\x00\x90\x1a@\x10\x80\x1a\x00\x00\x90&@\x10\x80&\x00\x00\x902@\x10\x802\x00\x00\x900@\x10\x800\x00\x00\xff/\x00'
s = SMF([test], instruments=None)
s.write(out_fd)
actual_bytes = out_fd.getvalue()
self.assertEqual(expected_bytes, actual_bytes)
def test_empty_sequence_merge(self):
"""
Ensure that an empty sequence merge is an identity operation
"""
s1 = self.make_sequence()
from sebastian.core import OSequence
s2 = OSequence([])
merged = s1 // s2
from sebastian.core import OFFSET_64, DURATION_64, MIDI_PITCH
self.assertEqual(merged._elements, [{
MIDI_PITCH: 50,
OFFSET_64: 16,
DURATION_64: 17
}, {
MIDI_PITCH: 53,
OFFSET_64: 19,
DURATION_64: 20
}])
def test_make_sequence(self):
"""
Ensure sequences are composed of notes in the correct order
"""
p1 = self.make_point()
p2 = self.make_point(offset=50) # we need to dedupe somehow
from sebastian.core import OSequence
from sebastian.core import OFFSET_64, MIDI_PITCH, DURATION_64
sequence = OSequence([p1, p2])
self.assertEqual(sequence._elements, [{
DURATION_64: 17,
OFFSET_64: 16,
MIDI_PITCH: 50
}, {
DURATION_64: 17 + 50,
OFFSET_64: 16 + 50,
MIDI_PITCH: 50 + 50
}])
def parse(s, offset=0):
return OSequence(list(parse_block(tokenize(s), offset=offset)))
MIDI_PITCH: 50,
DURATION_64: 16,
})
assert p1.tuple(OFFSET_64, DURATION_64) == (16, 16)
## sequences
p2 = Point({
OFFSET_64: 32,
MIDI_PITCH: 52,
DURATION_64: 16,
})
s1 = OSequence([p1, p2])
assert s1._elements == [
{DURATION_64: 16, OFFSET_64: 16, MIDI_PITCH: 50},
{DURATION_64: 16, OFFSET_64: 32, MIDI_PITCH: 52}
]
assert s1.last_point() == {
MIDI_PITCH: 52, OFFSET_64: 32, DURATION_64: 16
}
assert OSequence([]).last_point() == {
OFFSET_64: 0, DURATION_64: 0
}
def track_start(self, track_num):
self.current_sequence = OSequence()
self.tracks[track_num] = self.current_sequence
def make_hseq(notes):
return HSeq(Point(degree=n, duration_64=d) for n, d in notes)
# produces eighth and quarter notes
hlf = 16
qtr = 8
# tuples specify pitch and duration
p1 = [(8, qtr), (6, qtr), (5, qtr), (6, qtr)]
p2 = [(8, qtr), (6, qtr), (5, hlf)]
p3 = [(3, qtr), (2, qtr), (1, hlf)]
p4 = [(1, qtr), (6, qtr), (5, qtr), (6, qtr)]
p5 = [(1, qtr), (6, qtr), (5, hlf)]
partA = p1 + p2 + p1 + p3
partB = p4 + p5 + p4 + p3
parts = partA + partA + partB + partB
hseq = make_hseq(parts)
oseq = OSequence(hseq)
C_major = Key("C", major_scale)
# note values filled-out for C major in octave 5 then MIDI pitches calculated
seq = oseq | degree_in_key_with_octave(C_major, 5) | midi_pitch()
write_midi.write("shortning_bread_2.mid", [seq])
from sebastian.core.notes import Key, major_scale
from sebastian.core.transforms import degree_in_key_with_octave, midi_pitch, transpose
# Hanon 1
up_degrees = [1, 3, 4, 5, 6, 5, 4, 3]
down_degrees = [6, 4, 3, 2, 1, 2, 3, 4]
final_degree = [1]
sections = [
(up_degrees, 4, range(14)),
(down_degrees, 4, range(13, -2, -1)),
(final_degree, 32, range(1)),
]
hanon_1 = OSequence()
for section in sections:
pattern, duration_64, offset = section
for o in offset:
for note in pattern:
hanon_1.append({"degree": note + o, DURATION_64: duration_64})
hanon_1 = hanon_1 | degree_in_key_with_octave(Key("C", major_scale),
4) | midi_pitch()
hanon_rh_1 = hanon_1
hanon_lh_1 = hanon_1 | transpose(-12)
seq = hanon_lh_1 // hanon_rh_1
from sebastian.core import VSeq, HSeq, Point, OSequence
from sebastian.core.transforms import midi_pitch, degree_in_key_with_octave, add
from sebastian.core.notes import Key, major_scale
from sebastian.midi import write_midi
def alberti(triad):
"""
takes a VSeq of 3 notes and returns an HSeq of those notes in an
alberti figuration.
"""
return HSeq(triad[i] for i in [0, 2, 1, 2])
# an abstract VSeq of 3 notes in root position (degree 1, 3 and 5)
root_triad = VSeq(Point(degree=n) for n in [1, 3, 5])
quaver_point = Point({DURATION_64: 8})
# an OSequence with alberti figuration repeated 16 times using quavers
alberti_osequence = OSequence(alberti(root_triad) * 16 | add(quaver_point))
C_major = Key("C", major_scale)
# note values filled-out for C major in octave 5 then MIDI pitches calculated
seq = alberti_osequence | degree_in_key_with_octave(C_major, 5) | midi_pitch()
# write to file:
write_midi.write("alberti.mid", [seq])
def end(scale):
return HSeq(scale[i] for i in [2, 1]) | add(quaver_point)
def h2(scale):
return HSeq(scale[i] for i in [0, 4, 3, 4]) | add(quaver_point)
def h2_end1(scale):
return HSeq(scale[i] for i in [0, 4]) | add(quaver_point)
# there's two important quarter notes used at the ends of sections
e1 = HSeq(scale[3]) | add(quarter_point)
e2 = HSeq(scale[0]) | add(quarter_point)
partA = h1(scale) + h1_end1(scale) + e1 + h1(scale) + end(scale) + e2
partB = h2(scale) + h2_end1(scale) + e1 + h2(scale) + end(scale) + e2
# here we see the basic structure of the song
oseq = OSequence((partA * 2) + (partB * 2))
C_major = Key("C", major_scale)
# note values filled-out for C major in octave 5 then MIDI pitches calculated
seq = oseq | degree_in_key_with_octave(C_major, 5) | midi_pitch()
# write to file:
write_midi.write("shortning_bread_1.mid", [seq])
def track_start(self, track_num):
self.current_sequence = OSequence()
self.tracks[track_num] = self.current_sequence
from sebastian.core.transforms import degree_in_key_with_octave, midi_pitch, transpose
# Hanon 1
up_degrees = [1, 3, 4, 5, 6, 5, 4, 3]
down_degrees = [6, 4, 3, 2, 1, 2, 3, 4]
final_degree = [1]
sections = [
(up_degrees, 4, range(14)),
(down_degrees, 4, range(13, -2, -1)),
(final_degree, 32, range(1)),
]
hanon_1 = OSequence()
for section in sections:
pattern, duration_64, offset = section
for o in offset:
for note in pattern:
hanon_1.append({"degree": note + o, DURATION_64: duration_64})
hanon_1 = hanon_1 | degree_in_key_with_octave(Key("C", major_scale), 4) | midi_pitch()
hanon_rh_1 = hanon_1
hanon_lh_1 = hanon_1 | transpose(-12)
seq = hanon_lh_1 // hanon_rh_1
def make_sequence(self, offset=0):
points = [self.make_point(offset), self.make_point(offset + 3)]
from sebastian.core import OSequence
return OSequence(points)
# play MIDI
player.play([seq5])
# write to MIDI
write_midi.write("seq5.mid", [seq5])
# contruct a horizontal sequence of scale degrees
seq6 = HSeq(Point(degree=degree) for degree in [1, 2, 3, 2, 1])
# put that sequence into C major, octave 4 quavers
C_MAJOR = Key("C", major_scale)
seq7 = seq6 | add({"octave": 4, DURATION_64: 8}) | degree_in_key(C_MAJOR)
# convert to MIDI pitch and play
player.play([OSequence(seq7 | midi_pitch())])
# sequence of first four degree of a scale
seq8 = HSeq(Point(degree=n) for n in [1, 2, 3, 4])
# add duration and octave
seq8 = seq8 | add({DURATION_64: 16, "octave": 5})
# put into C major
seq8 = seq8 | degree_in_key(C_MAJOR)
# annotate with lilypond
seq8 = seq8 | lilypond()
# write out lilypond file
write("example.ly", seq8)