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

[Damien Sandras <dsandras seconix com>]

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


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