meta_events.py 文件源码

def time_signature(data: Union[FileIO, BufferedReader]) -> Tuple[int, Tuple[int, int, int, int], bytearray]:
    length_bytes = bytearray(data.read(1))
    length = int.from_bytes(length_bytes, "big")

    if length != 0x04:
        raise EventLengthError("Time Signature event has invalid length. Should be 4, value was {}".format(length))

    data_bytes = bytearray(data.read(4))  # type: bytearray
    numerator = data_bytes[0]  # type: int
    denominator = data_bytes[1]  # type: int
    clock_num = data_bytes[2]
    ts_number = data_bytes[3]

    return length, (numerator, denominator, clock_num, ts_number), data_bytes