Thanks for the info. I had looked at v4l and X source code, including i810_video.c, but didn't know about xf86XVRegisterOffscreenImages (actual spelling). I can see that in the mga driver source. Regarding "offscreen surface support": Other than the source code, is there any way to tell that you have "offscreen surface support"? Is there anything returned from the Xv or V4L interfaces, or is there any required setup? Or does it "just work", so that when you start video using Video4Linux, the YUV video goes to the offscreen surface? Before I attempt to put "offscreen surface support" into the i810 driver: - is "mga" the best / simplest example? If not, which one? - what's the real advantage of using the offscreen surface? Reduced bandwidth due to subsampled YUV is one. Any others, e.g. quality? The hardware color key stuff would be a big advantage if we had the XV_DONT_BLIT_THE_COLORKEY option (see your other mail). Is that implemented in any other driver? - is anyone else adding this support to the i810 driver, or planning on doing so? Peter Kaczowka Michael wrote: > On Fri, Feb 16, 2001 at 09:15:53PM +0000, Gerd Knorr wrote: > > > The other thing to consider is that the v4l module needs support for > > > something called 'offscreen surfaces' which are, AFAICT only supported by > > > chips, mga, savage and siliconmotion at the moment (I've a patch for > > > tdfx) > > > > Do you have xfree86 release numbers for these? I'll update xawtv's > > README.xfree4 then (which lists only mga because that's the only one > > where I *know* it works). > > I did a simple grep on the latest CVS, so I don't really know those work, > just that ones without the support shouldn't :o) > > However, I've just checked and all the drivers that call > XF86XvRegisterOffscreenImages are in the xf-4_0_2-branch except savage > which is only in the latest CVS. > > I missed trident from the list too. > -- > Michael. > > _______________________________________________ > Video4linux-list mailing list > Video4linux-list@xxxxxxxxxx > https://listman.redhat.com/mailman/listinfo/video4linux-list
