Make file handling more thread-safe

    """

    fid = open(filename, "rb")

    try:

    with open(filename, "rb") as fid:

        riff = fid.read(4)

        if riff == b"RIFF":

        elif riff == b"RIFX":

            binary_format = ">"

        else:

            raise ValueError("No RIFF!")

            raise ValueError(f"Not a RIFF file: {filename}")

        wav_size = struct.unpack(f"{binary_format}I", fid.read(4))[0]

        wav_identifier = fid.read(4)

        if wav_identifier != b"WAVE":

            raise ValueError("No WAVE!")

            raise ValueError(f"Not a WAVE file: {filename}")

        fmt_chunk_id = fid.read(4)

        else:

            raise ValueError("No or corrupt fmt chunk!")

    finally:

        fid.close()

    return {

        "size": wav_size,

        "format_tag": wav_format,