G200+NV12 (Re: [MPlayer-G2-dev] Darwin port)

[Arpi]

Hi,

> On Fri, May 09, 2003 at 01:32:22AM +0200, Arpi wrote:
> > Btw Vektor mentioned scanline buffers yesterday, and I think it's a very
> > interesting approach. ie. replace plane+stride with array of scanline
> > pointers :)
> > It would allow very amazing optimizations, like DR scanlines without OSD,
> > and copy the rest. But I guess such feature won't go into g2 soon, maybe
> > into g3, or in g2 v2.0 :))
> 
> Yes, but it's only good for scanline-based filters. For example, if
> you want to apply a block-based filter (e.g. deblock, dering, telecine
> detection, anything DCT-based, etc.) you have to load a separate base
> pointer every 8 pixels or so inside your inner loop, which is horribly
> inefficient. With a single base plus stride, you can just use two
> registers (current position and stride) with no extra memory reads.

Hmm, you're right...
Btw afair Michael's postproc code copies macroblocks into some internal
aligned in-l1-cache buffer for processing and at the end it copies it back.

Btw 2, what about MB-lines instead of scanlines? :)


A'rpi / Astral & ESP-team

--
Developer of MPlayer, the Movie Player for Linux - http://www.MPlayerHQ.hu