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

[Matthias Schneider <ma30002000 yahoo de>]

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)


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.
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-     
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