I'd suspect the X driver should now be able to make full size xfers
while decoding too, on all systems. I think all we need to know is the
current YUV buffer used, we have all them defined, and a similar decoding
function like the encoding one to split the Y and UV apart. Maybe the
YUV decoding xfer info is in a higher mailbox number, have to check that,
we should get the Y offset, UV offset and PTS possibly, just like
encoding does. Another thing to think about here is the PCM
data for sound, we will need that too for really decoding
YUV video.
Thanks,
Chris
On Wed, Mar 23, 2005 at 10:49:11PM -0500, Jelle wrote:
> On Wed, 23 Mar 2005 21:52:37 +0000, John Harvey wrote:
>
> > Chris
> > I think that vsync wants removing whatever. Since X is currently
> > doing 2 calls for large screen updates it means that a full screen X
> > update takes 2 vsync's which is bad.
> >
> > I think in time it should possibly be an option to the prep frame call to
> > request a vsync'ed transfer, but for now I think this patch is correct.
>
> For quite a while now, I've been using a patched x11 driver that does
> only one call, even for full screen without any problems (ivtv 0.3.x)
>
> John, any ideas about YUV decoder support (xvideo)?
>
> Jelle.
>
>
> --- ivtv/ivtvhw.c 2004-12-15 16:04:27.000000000 -0500
> +++ ivtv.patched/ivtvhw.c 2005-02-05 20:46:26.000000000 -0500
> @@ -750,8 +754,8 @@
> unsigned long totalData =
> endOffset - startOffset;
>
> -
> - if (totalData > 64 *1024 *4)
> +#if 0
> + if (totalData > 64 *1024 *4) /* otherwise we get "Count 1441792 Offset
> -59392 is greater than buffer" from the driver */
> {
> /* This is a bigger lump so send in 2 bits */
> totalData /= 2;
> @@ -759,15 +763,20 @@
> secondOffset = endOffset - totalData;
> } else
> {
> - totalData = (totalData + 65535) & ~65535;
> +#endif
> + if (totalData <= 64 *1024 *21) /* otherwise we get "Count
> 1441792 Offset -59392 is greater than buffer" from the driver during playback
> */
> + {
> + totalData = (totalData + 65535) & ~65535;
> + }
>
>
> if ((startOffset + totalData) > totalScreenSize)
> {
> startOffset -= (startOffset + totalData) - totalScreenSize;
> }
> +#if 0
> }
> -
> +#endif
>
> args.source = ((char *)ptr+startOffset);
> args.dest_offset = startOffset;
>
>
>
>
>
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--
---
Chris Kennedy / [EMAIL PROTECTED]
Engineer KMOS-TV/KTBG-FM
Broadcasting Services Department
Central Missouri State University
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