unhideMesage_audiostego3.py

from scipy.io.wavfile import read, write
import numpy as np
import sys
import os

def main():
    if len(sys.argv) != 2:
        print "Usage: python %s <input-file>" % sys.argv[0]
        exit(1)

    input_file = sys.argv[1]
    if not os.path.exists(input_file):
        print "Input file '%s' does not exist" % input_file
        exit(1)

    try:
        rate, samples = read(input_file)
    except ValueError as e:
        print 'Exception: %s' % e
        exit(1)

    binary_string = ''
    for l, r in samples:
        delta = abs(l - r)
        binary_string += str(delta)

    print ''.join([chr(int(binary_string[i:i+8], 2)) for i in range(0, len(binary_string), 8)])

if __name__ == '__main__':
    main()