| 摘要 |
A compressor (25) serves to compress headers of media packets and sends context information to a decompressor (60) for use by the decompressor in decompressing compressed headers (26) of the media packets. With regard to a flow (56) of the media packets from the compressor (25) to the decompressor (60), the compressor (60) controls inclusion of the context information in the flow in accordance with a media characteristic of the media packets. For example, in an illustrative, non-limiting illustration, a context transmission controller (46) of the compressor controls timing of generation of packets which include the context information in accordance with the media charateristic of the media packets. In one mode of operation, the predetermined characteristic which causes inclusion of the context information is media codec access information included in a payload of a packet. Upon detection of the media codec access information, the compressor includes static parameters for a compression context in the context information. In another mode of operation, the predetermined characteristic can be a type of media frame included in a payload of a packet whose header is to be compressed, e.g., an independently encoded media frame, wherein the detection of the independently encoded media frame prompts inclusion of dynamic parameters for the compression context. |
