[Mesa-dev] XvMC and VDPAU on radeon hardware

Younes Manton younes.m at gmail.com
Fri Oct 22 16:56:10 PDT 2010

2010/10/22 Christian König <deathsimple at vodafone.de>:
> Hi, Younes,
> my target is the R600 chipset not the R300 series, so the first step was
> merging the pipe-video branche with master and getting r600g to work.
> After this was done, I added a video context creation function to r600g
> as you suggested. Least I fixed some uninitialized memory bugs in your
> XvMC implementation (you should run valgrind more often).
> And now I simply have to say that I'm deeply impressed by the cool
> design of your XvMC driver and Galium3D in general. It simply works
> great!!!
> Ok, I still have a bunch of problems, there seems to be some more
> uninitialised memory issues (it only starts cleanly approx 3 of 4
> times), and some decoding artefacts are hard to track down.

What's currently in the pipe-video branch works with softpipe, nv40
pipe_context, and the nv40 hardware decoder via Jimmy Rentz's patches.
I've never seen any uninitialized memory problems, at least with the
currently supported MPEG2 variations. At the moment it only supports
frame coded pictures, so if you have any interlaced videos or videos
using some of the unimplemented mocomp modes you might run into such

> Do you know a simple XvMC client that I could use for testing? I'm
> currently using mplayer, but that's not very well usable when you want
> to debug each frame step by step.

Try http://www.xfree86.org/~mvojkovi/mpeg2play_accel.tar.gz

It's simple enough to hack as you please.

> I also need more testvideos, currently using a bunch of DVDs and
> trailers, but I need some simple reference videos (bouncing balls,
> rotating lines and stuff like that) with only a few macroblocks to
> decode for each frame.

If you have imagemagick or mencoder installed you can create small
clips from individual image files.

> I cc'ed the mailing list and andrew just in case somebody else knows a
> god source for testvideos or client apps.
> I have some more questions about the source, but will mail you about
> that later.
> Regards,
> Christian.

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