Re: [Ekiga-devel-list] preliminary patch for X-Video support

[Damien Sandras <dsandras seconix com>]

Hi,

Le mardi 12 septembre 2006 à 21:49 +0200, Matthias Schneider a écrit :
> Hello,
> 
> if I understand you and Julien correctly the best aproach would be:
> write a wrapper PVideoOutputDevice_ekiga that registers with OPAL (in GMManager::GMManager()) and
> may switch between multiple PVideoOutputDevices dynamically? (right now that would be GDK/SDL and
> XV)
> 

I'm not sure if it is what Julien means, but that's what I meant indeed.

> 
> However this requires a change of the PVideoOutputDevice interface specifications if I am not
> mistaken, we need some way to signal back to the wraper device that something has gone wrong and
> we have to select the next-priority device. This could be e.g.
>   - a init function that returns some value
>   - let the setframedata function return some information
>   - both
> Please let me know if I understood correctly and my conclusion is correct.

The upper-level class would have its own SetFrameData function. But that
function wouldn't be called, it would be overloaded and the SetFrameData
function of the specific display device would be used instead. When it
fails, it would fallback.

Julien can elaborate on this, as he has already thought a lot about it.

> Matthias
> 
> --- Damien Sandras <dsandras seconix com> schrieb:
> 
> > Le mardi 12 septembre 2006 à 21:35 +0200, Matthias Schneider a écrit :
> > > Hello, 
> > > 
> > > > > My question now is where and how could I possibly implement a fallback in case XV is not
> > > > > available? Can I register a PVideoOutputDevice_GDK from inside the PVideoOutputDevice_XV
> > > > class? Or
> > > > > where could I start to implement something like that? 
> > > > > 
> > > > 
> > > > I think that unfortunately you not switch from one PVideoOutputDevice to
> > > > another once it is open. Doing so would require changes in OPAL.
> > > > 
> > > > Perhaps Craig can comment on this?
> > > > 
> > > > So I see two solutions :
> > > > - Modify OPAL so that you can change from one PVideoOutputDevice to
> > > > another during a call
> > > > - Create a new PVideoOutputDevice_Ekiga class from the current GDK one
> > > > that is able to draw using xv and fallback to SDL or GDK if it is not
> > > > possible.
> > > > 
> > > > 
> > > Perhaps there is a third option: 
> > > - instanciate a PVideoOutputDevice_GDK from inside PVideoOutputDevice_XV, convert the frame on
> > > receipt from YUV420P to RGB in PVideoOutputDevice_XV and send them to the
> > PVideoOutputDevice_GDK
> > > instance? Is that possible? I would like to keep the XV and GDK output code separated...
> > Perhaps
> > > it also makes sense to move some of the outut code in main.cpp to videooutput_gdk.cpp?
> > 
> > What I would do is the following :
> > - A generic class unable to display
> > - A few other classes, to handle the display
> 
> > 
> > 
> > -- 
> >  _      Damien Sandras
> > (o-     
> > //\     Ekiga Softphone: http://www.ekiga.org/
> > v_/_    FOSDEM 2006    : http://www.fosdem.org/
> >         SIP Phone      : sip:dsandras ekiga net
> >                          sip:600000 ekiga net
> > 
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> > 
> 
> 
> 
> 	
> 
> 	
> 		
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