def METHOD_NAME(h, f):
    if h[:20] != 'Creative Voice File\032':
        return None
    sbseek = get_short_le(h[20:22])
    rate = 0
    if 0 <= sbseek < 500 and h[sbseek] == '\1':
        ratecode = ord(h[sbseek+4])
        rate = int(1000000.0 / (256 - ratecode))
    return 'voc', rate, 1, -1, 8