Returns a bytearray of the WAVE RIFF header and fmt
    chunk for a `WAVEDescriptor` `Summary`

def wave_infochunk(path):
    """
    Returns a bytearray of the WAVE RIFF header and fmt
    chunk for a `WAVEDescriptor` `Summary`
    """
    with open(path,'rb') as file:
        if file.read(4) != b"RIFF":
            return None
        data_size = file.read(4) # container size
        if file.read(4) != b"WAVE":
            return None
        while True:
            chunkid = file.read(4)
            sizebuf = file.read(4)
            if len(sizebuf) < 4 or len(chunkid) < 4:
                return None
            size    = struct.unpack(b'<L', sizebuf )[0]
            if chunkid[0:3] != b"fmt":
                if size % 2 == 1:
                    seek = size + 1
                else:
                    seek = size
                file.seek(size,1)
            else:
                return bytearray(b"RIFF" + data_size + b"WAVE" + chunkid + sizebuf + file.read(size))