On Wed, Jan 02, 2002 at 06:49:35PM +0100, Peter Surda wrote:
> On Wed, Jan 02, 2002 at 05:45:56PM +0100, Zdenek Kabelac wrote:
> > Well I could test TV Out only during weekends - but I guess the long
> > cammera panning scenes will cause some problems unless the image would
> > be blured.
> Yep. I'll send you something on which I see problems.
I still have the japanies clip - so there is no need - I'll check it
with this one later...
> > the problem with setting right values for H/V sync signals - and
> > should be easy to solve if the driver would be written by me...
> Well, the ATI TVout is written by me so I know this is not possible yet :-)
>From doc for Matrox card it looks like rather simple thing to select
image borders and I would expect the same for ATI
> > scheduler (I would say it wakes the thread with 99.9% precision at least
> > with my mga driver)
> I should be more precise: ATI handles double buffering in hardware, when
> you tell it "do yuv conversion/scaling" and set a certain bit, the picture
> isn't drawn immediately, only on the next refresh. And as the command returns
aviplay for now doesn't use hw double buffering of mga_vid device - but
it works with MGA the same way as you describe for ATI - for duuble
buffering you also do not have to wait until image is being flipped.
But I've modified the driver in such a way that read operation
on device will wait for the next vsync blank interrupt.
Thus aviplay is only using read on this device to get proper timing - it
has nothing common with XFree rendering stuff - it's still fully
handle inside XFree
> why it happens to me, aviplay has no idea when the actual drawing happens.
That is why LINUX needs such device and I still couldn't understand
why it's not there - even ZXSpectrum has been able to provide such
thing...
> I'd like to keep the double-buffering to prevent tearing. So my idea is to
> write a module that wakes the video renderer thread AFTER the refresh has
> finished, not when it begins. This will allow the transfer part of
That's what we are talking about all the time :)
- some modular architecture which would provide interrupt handler and
eventualy some extra addons for some video cards
- though it would be much better if these would be handled by XFree directly
(ok there are still some 'weird' people who prefer console & framebuffer...
so there might be some reason to provide such capabilities outside of
XFree)
--
.''`. Which fundamental human right do you want to give up today?
: :' : Debian GNU/Linux maintainer - www.debian.{org,cz}
`. `' Zdenek Kabelac kabi@{debian.org, users.sf.net, fi.muni.cz}
`- Resistance is futile. You all will be packaged
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