4.4 H.263 Payload Header in RFC Mode, Mode A, Intraframe
Consider the following payload header in big-endian byte order.
-
0x05, 0x70, 0x00, 0x01
This corresponds to payload header fields with the following values.
|
Field |
Value |
|---|---|
|
F |
0 |
|
P |
0 |
|
SBIT |
0 |
|
EBIT |
5 |
|
SRC |
3 (CIF) |
|
I |
1 (intraframe) |
|
U |
0 |
|
S |
0 |
|
A |
0 |
|
R |
0 |
|
DBQ |
0 |
|
TRB |
0 |
|
TR |
1 |
The following code snippet expands the payload header to include the RTP packet that contains the payload:
-
0x40, 0x41, 0x22, 0x22, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x01, 0x9C, 0x66, 0x80, 0x06, 0x00, 0x00, 0x00, 0x00
In this case, the definition of the RTP header [MS-RTPME] is the following:
|
Field |
Value |
|---|---|
|
P |
0 |
|
X |
0 |
|
CC |
0 |
|
M |
0 |
|
PT |
65 |
|
Sequence Number |
8738 |
|
timestamp |
65535 |
|
SSRC |
1 |
The H.263 payload is recognized by the PT (payload type) field, with the value being negotiated in SDP [MS-SDP].