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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def decode(self, fd, mtu, max_len=2560):
 """ Read the media transport descriptor, depay the RTP payload and decode the SBC frames into a byte array. The maximum number of bytes to be returned may be passed as an argument and all available bytes are returned to the caller. :param int fd: Media transport file descriptor :param int mtu: Media transport MTU size as returned when the media transport was acquired. :param int max_len: Optional. Set maximum number of bytes to read. :return data: Decoded data bytes as an array. :rtype: array{byte} """

        output_buffer = ffi.new('char[]', max_len)
        sz = self.codec.rtp_sbc_decode_from_fd(self.config,
                                               output_buffer,
                                               max_len,
                                               mtu,
                                               fd)
        return ffi.buffer(output_buffer[0:sz])