New libXvMC wrapper.

[Sérgio Monteiro Basto]

Hi ,
I read somewhere in this tread, that this wrapper might work with Savage
drive, I still have the source for xvmc from VIA savage drive but never
worked in earlier versions of X, and I don't know if ever works , but I
like to try this wrapper on my laptop.

So what I have to do? to try it out? :)


thanks ,

On Tue, 2004-09-21 at 23:34, Thomas Hellstrom wrote:
> Hi, list!
> 
> Anybody opposed to this going in it's current form? If not, it will be
> enabled for
> linux and gcc, where I know the -nostartfiles option will work.
> 
> /Thomas
> 
> 
> 
> Thomas Hellström wrote:
> > Hi! 
> > 
> > I've attached a patch for a proposal of a libXvMC wrapper. 
> > The purpose of the wrapper is to allow XvMC clients to link to
> > different 
> > hardware-specific dynamic XvMC libraries runtime. Contrary to the
> > situation with libGL.so and the dri 3D drivers there is no builtin
> > mechanism for this. 
> > 
> > Current available XvMC libs include 
> > libI810XvMC.so                       (in the Xorg tree) 
> > libXvMCNVIDIA.so                  (Closed-source from Nvidia site) 
> > libviaXvMC.so                         (With a nonstandard VLD
> > extension available from the unichrome project) 
> > and the savage XvMC code, which I haven't looked closer at. 
> > 
> > Up to now the option has been to link to either of these (Xine, for
> > example, links to the Nvidia driver) and this will mean the lib has
> > to be present at runtime and the code will only work with Nvidia
> > hardware. 
> > 
> > The proposed solution eliminates this problem by providing a
> > libXvMCW.so, which, at runtime, dlopens the library listed in the
> > file <configdir>XvMCConfig and resolves the  necessary symbols,
> > including , if present, the nonstandard VLD extension. This will
> > make it possible for codes implementing this extension to also
> > runtime link to libraries not including it. 
> > 
> > Packagers wanting to include XvMC support for a media player can
> > easily do so for all hardware that supports it, without having to
> > include the HW specific libraries. 
> > 
> > I've tested it with with linux, xine and the via (xine-xxmc) and
> > Nvidia (xine-xvmc) drivers and it works as expected. It also loads
> > and fires up the I810 driver but unfortunately I have no hardware to
> > test it against. 
> > 
> > Caveats could be portability: linking the lib requires the
> > -nostartfiles gcc flag. I'm also not sure which implementations of
> > dlopen supports library wrapping in this way. 
> > 
> > Comments / Opinions would be appreciated. The diff is against
> > current Xorg CVS, and also includes the 
> > VLD extension header. 
> > 
> > Thomas Hellström 
> > The Unichrome project 
> > 
> > 
> > ____________________________________________________________________
> > _______________________________________________
> > xorg mailing list
> > xorg at freedesktop.org
> > http://freedesktop.org/mailman/listinfo/xorg
> >   
> 
> 
> 
> ______________________________________________________________________
> _______________________________________________
> xorg mailing list
> xorg at freedesktop.org
> http://freedesktop.org/mailman/listinfo/xorg
-- 
Sérgio M. B.