#! /usr/bin/env python import sysfrom aubio import source, sink if __name__ == '__main__':    if len(sys.argv) < 3:        print('usage: %s <inputfile> <outputfile> [samplerate] [hop_size]' % sys.argv[0])        sys.exit(1)     if len(sys.argv) > 3: samplerate = int(sys.argv[3])    else: samplerate = 0    if len(sys.argv) > 4: hop_size = int(sys.argv[4])    else: hop_size = 256     f = source(sys.argv[1], samplerate, hop_size)    if samplerate == 0: samplerate = f.samplerate    g = sink(sys.argv[2], samplerate)     total_frames, read = 0, hop_size    while read:        vec, read = f()        g(vec, read)        total_frames += read    outstr = "wrote %.2fs" % (total_frames / float(samplerate))    outstr += " (%d frames in" % total_frames    outstr += " %d blocks" % (total_frames // f.hop_size)    outstr += " at %dHz)" % f.samplerate    outstr += " from " + f.uri    outstr += " to " + g.uri    print(outstr)