2.2.11.9 RTCP Profile Specific Extension for Packet Train Packet

The format of the RTCP profile specific extension for packet train packet is as follows: <31>

0	1		2	3	4	5	6	7	8	9		1 0	1	2	3	4	5	6	7	8	9	2 0	1	2	3	4	5	6	7	8	9	3 0	1
Type																		Length
SSRC
L		Packet Idx							R		Packet Count							Packet Train Byte Count

Type (2 bytes): The extension type. Set to 0x000B (11).

Length (2 bytes): The extension length in bytes, including this header. Set to 0x000C (12).

SSRC (4 bytes): The SSRC from which the packet train packet is sent.

L (1 bit): The last packet train packet flag. This field MUST be set to 1 if the packet is the last packet train packet in the packet train. It MUST be set to 0 otherwise.

Packet Idx (7 bits): The index of the packet train packet in the packet train. It starts from 0.

R (1 bit): Reserved. The sender SHOULD set it to 0. The receiver MUST ignore it.

Packet Count (7 bits): The total number of packet train packets in the packet train.

Packet Train Byte Count (2 bytes): The accumulated number of bytes in the RTCP RR packets containing the packet train packet counting from the first packet train packet to this packet train packet.