[asterisk-dev] how does a channel driver know the result of codec negotiation ?

[Olle E Johansson]

14 okt 2007 kl. 21.47 skrev Luigi Rizzo:

> On Sat, Oct 13, 2007 at 09:37:20AM +0200, Kevin P. Fleming wrote:
>> Luigi Rizzo wrote:
>>
>>> i know - didn't want to make the story too long :)
>>> (i suppose it is also a problem to pass the information across
>>> a chain of asterisks)
>>
>> Yes, that will be complicated to solve properly as well.
>>
>>> ok will keep in mind. Any idea of how other PBX address this issue ?
>>
>> I don't know of very many PBX products that support videophones, and
>
> but as you said the problem exists in general, even for audio-only
> calls where the PBX is not in the media stream (and the two ends
> use a different technology - e.g. probably chan_sip handles this
> case already when connectiong two sip endpoints just because they
> happen to talk the same language ?)
>
> Anyways, what would be wrong with the obvious solution of notify
> the caller's channel driver once the remote party reports supported
> formats ?  I don't know exactly if we already have a suitable
> callback in struct ast_channel_tech but given the abundance of
> entries there i suppose one more wouldn't harm too much.

This is one of the issues we discussed at AstriDevCon in Atlanta
and we do have a proposal in Videocaps. Please look into
that branch. It might not be the proper one, but at least it
works.

/O