#! /usr/bin/env python import sysimport 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)