[Asterisk-video] Getting negotiated formats

[Sergio Garcia Murillo]

Hi Lorenzo,

There was a speciall branch in the dev tree that was working on a better
way of handling media capabilities (perhaps ask Olle).
Also tray the rawwriteformat,  rawreadformat and nativeformats.

Greetings
Sergio

----- Original Message ----- 
From: "Lorenzo Miniero" <lorenzo.miniero at unina.it>
To: <asterisk-video at lists.digium.com>
Sent: Thursday, May 24, 2007 4:00 PM
Subject: [Asterisk-video] Getting negotiated formats


> Hi all,
>
> I hope I'm sending this mail to the right mailing list this time, since
> by mistake I sent it to the developers list before...
>
> I have a doubt regarding a feature that I couldn't exploit, even though
> Kevin Fleming stated was there.
>
> Since I'm working on a remote videomixer for MeetMe, I need to know
> which formats have been negotiated when a user joins a conference, e.g.
> if the user will be using H.261, h263 and so on, to setup an adequate
> leg towards the external mixer and to forward the user the composed mix
> in a format it understands. The only way I have been able to do it so
> far is by waiting for the user to send its first video frame, and then
> look at its subclass: this of course is an all but the perfect solution,
> since a user could never send any video frame at all.
> However, on the asterisk-dev ML I have been told that it should however
> be possible to get the same information by just accessing some fields in
> the ast_channel structure. By deduction, I supposed this information was
> stored as a bit mask in readformat and writeformat, but I couldn't get
> any coherent info from there in the scenarios I tried. Do you know if
> there actually is a way to achieve this, or if support for this is
> incomplete?
>
> Thanks in advance, hope to hear you soon,
>
> Lorenzo
>
> -- 
> Lorenzo Miniero, Junior Researcher
> Dipartimento di Informatica e Sistemistica
> Università degli Studi di Napoli "Federico II"
> Via Claudio 21 -- 80125 Napoli (Italy)
> Phone: +390817683821 - Fax: +390817683816
> Email: lorenzo.miniero at unina.it
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