def vanDerWeijPerform(score, segments, expression_vectors):
deviations = Deviations()
tempo_deviations = {}
for segment, expression in zip(segments, expression_vectors):
start_tempo = expression[3]
tempo_direction = expression[5]
start_loudness = expression[4]
loudness_direction = expression[6]
articulation = expression[2]
i = 0
beat = 0
for note in segment:
velocity = start_loudness + i * loudness_direction
i += 1
score.tempo = tempo
performance = NoteList()
time = 0
for i in range(len(score)):
on = time + structure.ioi(score, i) * math.exp(expression[i][0])
loudness = average_loudness * math.exp(expression[i][1])
off = on + structure.duration(score, i) * math.exp(expression[i][3])
performance.insert(Note(int(on), int(off), score[i].pitch, int(loudness), 0))
time = on
return performance
def expressionWidmer(alignment):
performance = alignment.expressiveMelody()
melodyscore = alignment.melody()
score = tools.parseScore(melodyscore)
# The two above should be guaranteed to be of equal length.
# However, better be safe than sorry
if len(performance) != len(score):
print('This shouldn\'t happen: melodyscore and performance lengths don\'t match: {0} and {1}'.format(len(score), len(performance)))
else:
print("This is good, performance length and score length match")
# Mean loudness
mean_l = 0.0
for note in performance:
mean_l += note.onvelocity
mean_l = mean_l / float(len(performance))
expression = []
lasttempo = float(alignment.deviations.bpm)
lastdynamics = mean_l
# Assume same note order in score and performance (am I being naive?)
for i in range(len(performance)):
ioi_ratio = math.log(structure.ioi(performance, i) / float(structure.ioi(score, i)))
loudness_ratio = math.log(performance[i].onvelocity / mean_l)
# This obviously results in zero divisions
#articulation = math.log(structure.silence(performance, i) / float(structure.silence(score, i)))
articulation = 0
if(structure.duration(performance, i) < 1):
print("Invalid performance note :( skipping")
continue
duration_ratio = math.log(structure.duration(performance, i) / float(structure.duration(score, i)))
# To be implemented: second order ioi loudness and articulation
ioi_change = 0
loudness_change = 0
articulation_change = 0
# E = (ioi_r, loudness_r, articulation, duration_r, ioi_ch, loundess_ch)
e = (ioi_ratio, loudness_ratio, articulation, duration_ratio, ioi_change, loudness_change)
expression.append(e)
return expression
def widmerPerform(score, expression, average_loudness=80, tempo=80):
score.tempo = tempo
performance = NoteList()
time = 0
for i in range(len(score)):
on = time + structure.ioi(score, i) * math.exp(expression[i][0])
loudness = average_loudness * math.exp(expression[i][1])
off = on + structure.duration(score, i) * math.exp(expression[i][3])
performance.insert(Note(int(on), int(off), score[i].pitch, int(loudness), 0))
time = on
return performance
def vanDerWeijExpression(alignment, segments):
performance = alignment.expressiveMelody()
scorenotes = []
average_loudness = 0
for s in segments:
for n in s:
scorenotes.append(n)
average_loudness += n.onvelocity
average_loudness /= float(len(scorenotes))
# The two above should be guaranteed to be of equal length.
# However, better be safe than sorry
if len(performance) != sum([len(x) for x in segments]):
print('WARNING: Melodyscore and performance are different (should not happen): {0} and {1}'.format(len(sum([len(x) for x in segments])), len(performance)))
expression = []
# Counter for position in notelists performance and scorenotes
i = 0
for segment in segments:
length = float(len(segment))
average_articulation = 0.0
average_ioi_ratio = 0.0
loudnesses = []
for note in segment:
pointer = note.annotation
scorepart = alignment.melody()[pointer[0]]
scoremeasure = scorepart[pointer[1]]
scorevoice = scoremeasure[pointer[2]]
scorenote = scorevoice[pointer[3]]
measure = scoremeasure.number
# Find out if the next note is a rest, if so use the ratio between expressive duration and duration
useScoreDuration = False
# Last note of this measure?
if pointer[3] + 1 == len(scorevoice):
# Last measure?
if pointer[1] + 1 >= len(scorepart):
useScoreDuration = True
# Don't know what to do if the voice in the next measure contains no notes
elif scorepart[pointer[1]+1].getElementById(scorevoice.id) == None:
measure = scorepart[pointer[1]+1]
useScoreDuration = True
elif len(scorepart[pointer[1]+1].getElementById(scorevoice.id).notes) == 0:
measure = scorepart[pointer[1]+1]
useScoreDuration = True
# First note of this voice in the next measure is a rest?
elif scorepart[pointer[1]+1].getElementById(scorevoice.id).notes[0].isRest:
measure = scorepart[pointer[1]+1]
useScoreDuration = True
elif scorevoice[pointer[3]+1].isRest:
useScoreDuration = True
ioi = 1
if useScoreDuration or i+1 == len(performance):
ioi = performance.microseconds_to_ticks(alignment.deviations.getExpressiveDuration(scoremeasure.number, scorenote.offset, scorenote.duration.quarterLength))
else:
ioi = structure.ioi(performance, i+1)
# Ugly hack to fix something
if ioi == 0:
ioi = performance.microseconds_to_ticks(
alignment.deviations.getExpressiveDuration(scoremeasure.number, scorenote.offset, scorenote.duration.quarterLength)
)
#print "Performance ioi: {0}, score + tempo ioi: {1}, performance duration: {2}, measure{3}, offset {4}".format(ioi,\
# performance.microseconds_to_ticks(alignment.deviations.getExpressiveDuration(scoremeasure.number, scorenote.offset,\
# scorenote.duration.quarterLength)), structure.duration(performance, i), scoremeasure.number, scorenote.offset)
# Results in zero division error in Mozart: 28 (not needed anyway so let's kick it out)
#average_ioi_ratio += math.log(structure.ioi(performance, i) / float(structure.ioi(scorenotes, i)))
average_ioi_ratio += 0
average_articulation += structure.duration(performance, i) / float(ioi)
loudnesses.append(performance[i].onvelocity)
i += 1
tempos = []
r = list(range(segment[0].annotation[1], segment[int(length)-1].annotation[1]+1))
for m in r:
pointer = note.annotation
scoremeasure = alignment.melody()[pointer[0]][pointer[1]]
measure = scoremeasure.number
#print scoremeasure.duration.quarterLength
lasttempo = 1.0
for b in range(int(scoremeasure.barDuration.quarterLength)):
if (scoremeasure.number, b) in alignment.deviations.tempo_deviations:
lasttempo = alignment.deviations.tempo_deviations[scoremeasure.number, b]
tempos.append(lasttempo)
else:
tempos.append(lasttempo)
# Calculate performance parameters/features
average_ioi_ratio /= length
average_articulation /= length
average_tempo = sum(tempos) / float(len(tempos))
#average_relative_loudness = math.log((sum(loudnesses) / length) / average_loudness)
average_relative_loudness = (sum(loudnesses) / length) / float(average_loudness)
if len(segment) == 1:
(start_loudness, loudness_direction) = (average_loudness, 0)
(start_tempo, tempo_direction) = (tempos[0], 0)
else:
note_onsets = [n.on for n in segment]
(start_loudness, loudness_direction) = (0, 0) #linear_fit(note_onsets, loudnesses)
(start_tempo, tempo_direction) = (0, 0) #linear_fit(range(len(tempos)), tempos)
expression.append((average_ioi_ratio, average_relative_loudness, average_articulation, average_tempo, start_tempo, start_loudness, tempo_direction, loudness_direction))
return expression