Re: [rohc] Feedback formats

Hello cai,

I'm not completely sure what your mean.

First, there is a "short cut" to switch from U to O
mode (5.6.2.). In this case, a feedback-1 is sufficient, because
the receiving of any feedback shows to compressor that a feedback
channel is available and this is the precondition for bidirectional
optimistic mode.

Ideally the mode transition should be profile independent. But for the
IR/IR-DYN packet it isn't due to a design flaw. Only the dynamic chain
of the RTP Header contains the 'M' (5.7.7.6.) flag to transmit a
compression mode. For the other profiles you must use a extension-3.

Hope that helps.

If not, could you please explain the problem more detailed?

br
Klaus Warnke

cai.wei2@zte.com.cn wrote:
>
> RFC 3095 describes that when mode transitions, any feedback should be
> sent with mode transition parameter;
>
> at the same time, the feedback logic of decompressor in U/O/R mode
> also send feedback with mode parameter.
>
> there is a doubt that which case we could use feedback-1 in profile RTP?
>
> Thanks
> 	
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