def run(
self,
inputScore,
allowableChords=None,
closedPosition=False,
forbiddenChords=None,
maximumNumberOfChords=3,
):
from music21.stream import timespans
if 'Score' not in inputScore.classes:
raise ChordReducerException("Must be called on a stream.Score")
tree = timespans.streamToTimespanTree(inputScore,
flatten=True,
classList=(note.Note,
chord.Chord))
if allowableChords is not None:
assert all(isinstance(x, chord.Chord) for x in allowableChords)
intervalClassSets = []
for x in allowableChords:
intervalClassSet = self._getIntervalClassSet(x.pitches)
intervalClassSets.append(intervalClassSet)
allowableChords = frozenset(intervalClassSets)
if forbiddenChords is not None:
assert all(isinstance(x, chord.Chord) for x in forbiddenChords)
intervalClassSets = []
for x in allowableChords:
intervalClassSet = self._getIntervalClassSet(x.pitches)
intervalClassSets.append(intervalClassSet)
forbiddenChords = frozenset(intervalClassSets)
self.removeZeroDurationTimespans(tree)
self.splitByBass(tree)
self.removeVerticalDissonances(
tree=tree,
allowableChords=allowableChords,
forbiddenChords=forbiddenChords,
)
partwiseTrees = tree.toPartwiseTimespanTrees()
self.fillBassGaps(tree, partwiseTrees)
self.removeShortTimespans(tree, partwiseTrees, duration=0.5)
self.fillBassGaps(tree, partwiseTrees)
self.fillMeasureGaps(tree, partwiseTrees)
self.removeShortTimespans(tree, partwiseTrees, duration=1.0)
self.fillBassGaps(tree, partwiseTrees)
self.fillMeasureGaps(tree, partwiseTrees)
reduction = stream.Score()
#partwiseReduction = tree.toPartwiseScore()
#for part in partwiseReduction:
# reduction.append(part)
chordifiedReduction = timespans.timespansToChordifiedStream(
tree,
templateStream=inputScore,
)
chordifiedPart = stream.Part()
for measure in chordifiedReduction:
reducedMeasure = self.reduceMeasureToNChords(
measure,
maximumNumberOfChords=maximumNumberOfChords,
weightAlgorithm=self.qlbsmpConsonance,
trimBelow=0.25,
)
chordifiedPart.append(reducedMeasure)
reduction.append(chordifiedPart)
if closedPosition:
for x in reduction.flat.getElementsByClass('Chord'):
x.closedPosition(forceOctave=4, inPlace=True)
return reduction
def run(
self,
inputScore,
allowableChords=None,
closedPosition=False,
forbiddenChords=None,
maximumNumberOfChords=3,
):
from music21.stream import timespans
if 'Score' not in inputScore.classes:
raise ChordReducerException("Must be called on a stream.Score")
tree = timespans.streamToTimespanTree(inputScore, flatten=True, classList=(note.Note, chord.Chord))
if allowableChords is not None:
assert all(isinstance(x, chord.Chord) for x in allowableChords)
intervalClassSets = []
for x in allowableChords:
intervalClassSet = self._getIntervalClassSet(x.pitches)
intervalClassSets.append(intervalClassSet)
allowableChords = frozenset(intervalClassSets)
if forbiddenChords is not None:
assert all(isinstance(x, chord.Chord) for x in forbiddenChords)
intervalClassSets = []
for x in allowableChords:
intervalClassSet = self._getIntervalClassSet(x.pitches)
intervalClassSets.append(intervalClassSet)
forbiddenChords = frozenset(intervalClassSets)
self.removeZeroDurationTimespans(tree)
self.splitByBass(tree)
self.removeVerticalDissonances(
tree=tree,
allowableChords=allowableChords,
forbiddenChords=forbiddenChords,
)
partwiseTrees = tree.toPartwiseTimespanTrees()
self.fillBassGaps(tree, partwiseTrees)
self.removeShortTimespans(tree, partwiseTrees, duration=0.5)
self.fillBassGaps(tree, partwiseTrees)
self.fillMeasureGaps(tree, partwiseTrees)
self.removeShortTimespans(tree, partwiseTrees, duration=1.0)
self.fillBassGaps(tree, partwiseTrees)
self.fillMeasureGaps(tree, partwiseTrees)
reduction = stream.Score()
#partwiseReduction = tree.toPartwiseScore()
#for part in partwiseReduction:
# reduction.append(part)
chordifiedReduction = timespans.timespansToChordifiedStream(
tree,
templateStream=inputScore,
)
chordifiedPart = stream.Part()
for measure in chordifiedReduction:
reducedMeasure = self.reduceMeasureToNChords(
measure,
maximumNumberOfChords=maximumNumberOfChords,
weightAlgorithm=self.qlbsmpConsonance,
trimBelow=0.25,
)
chordifiedPart.append(reducedMeasure)
reduction.append(chordifiedPart)
if closedPosition:
for x in reduction.flat.getElementsByClass('Chord'):
x.closedPosition(forceOctave=4, inPlace=True)
return reduction