4.2 H.263 Payload Header in Draft Mode, Mode B, Interframe

Consider the following payload header in big-endian byte order.

 0x9C, 0x66, 0x80, 0x06, 0x00, 0x00, 0x00, 0x00

This corresponds to payload header fields with the following values.

 Field

 Value

F

1

P

0

SBIT

3

EBIT

4

SRC

 3 (CIF)

QUANT

6

I

0 (interframe)

A

0

S

0

GOBN

0

MBA

6

HMV1

0

VMV1

0

HMV2

0

VMV2

0

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 H.245 [H245].