Xvideo performance on Radeon 7500 vs Intel 915

Linxiao linxiao.li at gmail.com
Fri Dec 1 17:30:42 PST 2006

Hi, Roland:

     NV's Xv also just converts planar yuv (YV12) to packed yuv (VYUY) for
( I have had a glimpse of nv_video.c in Xorg6.8.2/7.1.) And that consumes
CPU a lot,
especially when I use nv's blitter ports to play 16channels X CIF YV12 video
which each is created as an XvImage and played with XvShmPutImage.

    Is there any existing patch for this? (I use nv 9550, and it should
support planar
yuv hardwarely.) If no, would you please provide any suggestion on playing
channels of video?

On 12/2/06, Roland Scheidegger <sroland at tungstengraphics.com> wrote:
> Roland Scheidegger wrote:
> > Anyway, the driver really should support planar yuv natively instead of
> > converting to packed yuv. Not only would it be faster, it would also
> > need less memory (as the common planar yuv format has the cr and cb
> > subsampled both vertically and horizontally while packed yuv has it only
> > subsampled horizontally).
> Ok, here's a newer version which applies cleanly to git head. It has
> most problems ironed out, with the exception that moving a video window
> beyond the screen border still causes ugly things (bogus video if moved
> to the left, bogus video and segfaults if moved to top). I'm wondering
> why and how that can work for the other formats...
> Roland
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> xorg at lists.freedesktop.org
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leal @ www.leal.cn
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