def drawSpectra(self, data, samplerate):
leftData, rightData = utils.channels(data)
leftPoints, rightPoints = [], []
width, _ = self.windowSize
# buffer left/right data
self.leftBuffer.add(leftData)
if (self.leftBuffer.filled):
leftSpectrum = self.buildSpectrum(self.leftBuffer.data)
# slicing the data breaks pitch dection outside of the window.
# (full range of the fft bins. doesn't have to fall inside the window.)
leftSpectrum = self.avgLeft.average(leftSpectrum)
leftPoints = self.drawSpectrum(leftSpectrum)
freq = self.calcFreq(leftSpectrum, samplerate)
self.printText(
"L Freq: {0:.2f}Hz {1}".format(freq, audio.pitch(freq)), 0,
self.leftcolor)
self.rightBuffer.add(rightData)
if (self.rightBuffer.filled):
rightSpectrum = self.buildSpectrum(self.rightBuffer.data)
rightSpectrum = self.avgRight.average(rightSpectrum)
rightPoints = self.drawSpectrum(rightSpectrum)
freq = self.calcFreq(rightSpectrum, samplerate)
self.printText(
"R Freq: {0:.2f}Hz {1}".format(freq, audio.pitch(freq)), 1,
self.rightcolor)
return leftPoints, rightPoints
def slow_down(track):
"""Slows down the track"""
rate = random.uniform(*config.SLOW_DOWN_RANGE)
return audio.pitch(track, round(rate, 2))
def speed_up(track):
"""Speeds up the track"""
rate = random.uniform(*config.SPEED_UP_RANGE)
return audio.pitch(track, round(rate, 2))