Reading a 24-bit wave file in Python

24bitwav.py

def sign_extend(bits, value):
    """ Sign-extend from http://stackoverflow.com/questions/32030412/twos-complement-sign-extension-python """
    sign_bit = 1 << (bits - 1)
    return (value & (sign_bit - 1)) - (value & sign_bit)


def get_samples(w):
    w.rewind()
    num_samples = w.getnframes()
    sample_depth = w.getsampwidth()
    raw_data = w.readframes(num_samples)
    for i in range(0, num_samples * sample_depth, sample_depth):
        yield sign_extend(
            sample_depth * 8,
            reduce(
                lambda x, y: x<<8 | y,
                reversed(raw_data[i:i+sample_depth])
            ))

""" Use it like this: """
samples = list(get_samples(wave.open("/path/to/file.wav", "r")))