#! /usr/bin/env python import sysimport os.pathimport aubio  def apply_filter(path, target):    # open input file, get its samplerate    s = aubio.source(path)    samplerate = s.samplerate     # create an A-weighting filter    f = aubio.digital_filter(7)    f.set_a_weighting(samplerate)     # create output file    o = aubio.sink(target, samplerate)     total_frames = 0    while True:        # read from source        samples, read = s()        # filter samples        filtered_samples = f(samples)        # write to sink        o(filtered_samples, read)        # count frames read        total_frames += read        # end of file reached        if read < s.hop_size:            break     # print some info    duration = total_frames / float(samplerate)    input_str = "input: {:s} ({:.2f} s, {:d} Hz)"    output_str = "output: {:s}, A-weighting filtered ({:d} frames total)"    print(input_str.format(s.uri, duration, samplerate))    print(output_str.format(o.uri, total_frames)) if __name__ == '__main__':    usage = "{:s} <input_file> [output_file]".format(sys.argv[0])    if not 1 < len(sys.argv) < 4:        print(usage)        sys.exit(1)    if len(sys.argv) < 3:        input_path = sys.argv[1]        basename = os.path.splitext(os.path.basename(input_path))[0] + ".wav"        output_path = "filtered_" + basename    else:        input_path, output_path = sys.argv[1:]    # run function    apply_filter(input_path, output_path)