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#! /usr/bin/env python
import sys
from aubio import source, sink, pvoc
if __name__ == '__main__':
if len(sys.argv) < 2:
print('usage: %s <inputfile> <outputfile>' % sys.argv[0])
sys.exit(1)
samplerate = 44100
f = source(sys.argv[1], samplerate, 256)
g = sink(sys.argv[2], samplerate)
total_frames, read = 0, 256
win_s = 512 # fft size
hop_s = win_s // 2 # hop size
pv = pvoc(win_s, hop_s) # phase vocoder
while read:
samples, read = f()
spectrum = pv(samples) # compute spectrum
#spectrum.norm *= .8 # reduce amplitude a bit
spectrum.phas[:] = 0. # zero phase
new_samples = pv.rdo(spectrum) # compute modified samples
g(new_samples, read) # write to output
total_frames += read
format_str = "read {:d} samples from {:s}, written to {:s}"
print(format_str.format(total_frames, f.uri, g.uri))
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