Mailinglist Archive: radeonhd (427 mails)

[Alex Deucher <alexdeucher@xxxxxxxxx>]

On Tue, May 12, 2009 at 12:17 PM, Matthias Hopf <mhopf@xxxxxxx> wrote:
> On May 12, 09 17:25:57 +0200, Rafał Miłecki wrote:
> > > Video decode is mostly done on shaders (at least motion compensation)
> > > on that hardware.  We've released the 3D engine information on these
> > > chips so this could be implemented now if anyone was so inclined.
> > Can you be more specific about this, please? I'm really intereseted
> >
> > Do you mean "is mostly done" or rather "can be mostly done"? Is that
> > implemented anywhere? Does that hardware mean RS690 or R5xx-R7xx,
>
> IDCT and motion compensation can be done with regular shaders. But what
> will bite you in h264 is the Cabac (sp?) encoding. It's said to need 45%
> of decompression time on CPUs, and that won't go away. I assume the UVD
> block in the hardware has the capability for this entropy decoding
> algorithm.
>
> AFAIR there have been papers on how to implement IDCT and motion
> compensation with shaders. I'm sorry, I don't remember where I read
> them, but it could even be white papers from NVIDIA (which doesn't mean
> that it can only be used on NVIDIA hardware).

Also, there is a gallium frontend for video decode:
http://www.bitblit.org/gsoc/g3dvl/index.shtml

Alex
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