PeerStreamer

    /**

     * Layout of the header (in bits):

     * 1:  len_included

     *     Flag indicating whether this header includes a length field;

     *     this can be used to concatenate multiple RDT packets in a

     *     single UDP/TCP data frame and is used to precede RDT data

     *     by stream status packets

     * 1:  need_reliable

     *     Flag indicating whether this header includes a "reliable

     *     sequence number"; these are apparently sequence numbers of

     *     data packets alone. For data packets, this flag is always

     *     set, according to the Real documentation [1]

     * 5:  set_id

     *     ID of a set of streams of identical content, possibly with

     *     different codecs or bitrates

     * 1:  is_reliable

     *     Flag set for certain streams deemed less tolerable for packet

     *     loss

     * 16: seq_no

     *     Packet sequence number; if >=0xFF00, this is a non-data packet

     *     containing stream status info, the second byte indicates the

     *     type of status packet (see wireshark docs / source code [2])

     * if (len_included) {

     *     16: packet_len

     * } else {

     *     packet_len = remainder of UDP/TCP frame

     * }

     * 1:  is_back_to_back

     *     Back-to-Back flag; used for timing, set for one in every 10

     *     packets, according to the Real documentation [1]

     * 1:  is_slow_data

     *     Slow-data flag; currently unused, according to Real docs [1]

     * 5:  stream_id

     *     ID of the stream within this particular set of streams

     * 1:  is_no_keyframe

     *     Non-keyframe flag (unset if packet belongs to a keyframe)

     * 32: timestamp (PTS)

     * if (set_id == 0x1F) {

     *     16: set_id (extended set-of-streams ID; see set_id)

     * }

     * if (need_reliable) {

     *     16: reliable_seq_no

     *         Reliable sequence number (see need_reliable)

     * }

     * if (stream_id == 0x3F) {

     *     16: stream_id (extended stream ID; see stream_id)

     * }

     * [1] https://protocol.helixcommunity.org/files/2005/devdocs/RDT_Feature_Level_20.txt

     * [2] http://www.wireshark.org/docs/dfref/r/rdt.html and

     *     http://anonsvn.wireshark.org/viewvc/trunk/epan/dissectors/packet-rdt.c

     */