process incoming rtp packets. Subclass must implement either
this method or @process_rtp_packet to process incoming rtp packets.
If the child returns a buffer without a valid timestamp, the timestamp
of the provided buffer will be applied to the result buffer and the
buffer will be pushed. If this function returns null, nothing is pushed.
process incoming rtp packets. Subclass must implement either this method or @process_rtp_packet to process incoming rtp packets. If the child returns a buffer without a valid timestamp, the timestamp of the provided buffer will be applied to the result buffer and the buffer will be pushed. If this function returns null, nothing is pushed.