Re: [GnomeMeeting-devel-list] X-Video Support

[Damien Sandras <dsandras seconix com>]

Hi!

Le samedi 13 mai 2006 à 10:57 +0200, Matthias Schneider a écrit :
> Hello,
> having implemented a class that provides X-Video support I would to raise some questions in
> connection with ekiga. My class makes use of the X-Video extension available by some graphics
> adaptor drivers and provides:
> 
> - hardware colorspace transformation (YUV->RGB)
> - hardware scaling
> - hardware antialiasing
> - aspect ratio correction (for not having “broad faces” on widescreen monitors)
> 

Excellent!

> Not only is it possible to decrease CPU load but also improve the picture quality. Also it is my
> belief that a certain resolution and framerate hardware acceleration cannot be avoided (according
> to the wiki there is work on large size video transmission, so I this would be very interesting
> for version 2.2)
> 
> My class is initialized with some initial values (e.g. frame resolution, initial window size, etc)
> and is handed a pointer to the frame to be displayed. A fullscreen and always-on-top mode exist.
> Since I use/plan to use this class in other projects as well I would prefer a kind of wrapper for
> integration for ekiga
> 
> I would like to ask if  such an extension would be accepted. 
> 
> As I understand the flow of video data, I would have to define a new PVideoOutputDevice like in
> videooutput.cpp and then do some modifications to main.cpp (where the actual drawing is performed
> at the moment if I understand correctly) Then I would have to register the new output device in
> manager.cpp with OPAL?
> 

Another possibility would be to only modify main.cpp and plug it there.
I'm not sure defining a new PVideoOutputdevice is needed.

> About compatibility issues, my idea was to be able to enable and disable the extension at compile
> time (like sdl). At runtime 2 possibilities come to my mind:
> - enable and disable per configuration dialogue
> - automatic with fallback (in case no XV port is currently available)
> 

Automatic would be the best. If xv is available, I think it is
preferable. Nobody will want to use the GTK implementation if XV is
available (I think).

> In case I missed some important aspect about the architecture feel free to comment.
> 
> Thanks in advance
> Matthias
> 
> 
> 	
> 
> 	
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