Re: iBook and playing DVDs
On Thu, 2002-05-16 at 00:51, Benjamin Herrenschmidt wrote:
> >
> >> That is you should have at least 2 buffers so you can asynchronously
> >> DMA a frame while decoding the next frame. It makes only sense to busy
> >> loop on the DMA if you are decoding faster than what you display. If this
> >> is not the case, then you are just throwing CPU cycles by the window.
> >>
> >> The whole point of DMA is for the CPU to do something else while the
> >> ATI chip is doing the transfer.
> >
> >The problem is that the XVideo extension is very simple (it was
> >basically designed to display single images with colorspace conversion
> >and scaling, nothing more), so if this scheme is possible at all with
> >it, the app will have to do the hard work.
>
> Doesn't xv support double buffer ?
Some drivers (including r128 and radeon) do, but that just means that
the current image will be displayed on the next retrace after it has
been transferred to video RAM.
--
Earthling Michel Dänzer (MrCooper)/ Debian GNU/Linux (powerpc) developer
XFree86 and DRI project member / CS student, Free Software enthusiast
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