ref: e6255799f5773036049a872845d63dc995a4e69c
dir: /python/demos/demo_pitchshift.py/
#! /usr/bin/env python
import sys
import aubio
if __name__ == '__main__':
if len(sys.argv) < 3:
print('usage: %s <inputfile> <outputfile> [transpose] [samplerate] [hop_size] [mode]' % sys.argv[0])
print('available modes: default, crispness:0, crispness:1, ... crispness:6')
sys.exit(1)
if len(sys.argv) > 3: transpose = float(sys.argv[3])
else: transpose = 12.
if len(sys.argv) > 4: samplerate = int(sys.argv[4])
else: samplerate = 0
if len(sys.argv) > 5: hop_size = int(sys.argv[5])
else: hop_size = 64
if len(sys.argv) > 6: mode = sys.argv[6]
else: mode = "default"
source_read = aubio.source(sys.argv[1], samplerate, hop_size)
if samplerate == 0: samplerate = source_read.samplerate
sink_out = aubio.sink(sys.argv[2], samplerate)
pitchshifter = aubio.pitchshift(mode, 1., hop_size, samplerate)
if transpose: pitchshifter.set_transpose(transpose)
total_frames, read = 0, hop_size
transpose_range = 23.9
while read:
vec, read = source_read()
# transpose the samples
out = pitchshifter(vec)
# position in the file (between 0. and 1.)
percent_read = total_frames / float(source_read.duration)
# variable transpose rate (in semitones)
transpose = 2 * transpose_range * percent_read - transpose_range
# set transpose rate
pitchshifter.set_transpose(transpose)
# print the transposition
#print pitchshifter.get_transpose()
# write the output
sink_out(out, read)
total_frames += read
# end of file, print some results
outstr = "wrote %.2fs" % (total_frames / float(samplerate))
outstr += " (%d frames in" % total_frames
outstr += " %d blocks" % (total_frames // source_read.hop_size)
outstr += " at %dHz)" % source_read.samplerate
outstr += " from " + source_read.uri
outstr += " to " + sink_out.uri
print(outstr)