From: Steffen Seeger <s.seeger@physik.tu-chemnitz.de>
  To  : ggi-develop@eskimo.com
  Date: Tue, 9 Feb 1999 10:34:27 +0100 (MET)

Re: [linux-fbdev] Accel or not accel in kernel! (fwd)

> > > > Question: what does this do for YUV support?
> > > > YUV support is an area of memory that takes data in YUV format, and
> > > > a chromakey in the frame buffer determines whether you see the frame
> > > > buffer or the YUV buffer. It's used to speed up MPEG display (eg used
> > > > by DVDs)
> > > > 
> > > > Will this be in a seperate YUV area -- would make sense for the Diamond
> > > > DVD card for instance which takes the output of a graphics card  adds the
> > > > mpeg
> > > > picture into the video frame.
> > > 
> > > Hum. This sounds like a /dev/bttv issue not a accel issue.
> > 
> > No. It's an /dev/fb issue as it requires/restricts the video mode set.
> > These are true overlay processors, and you need to know/restrict
> > the mode of the 'underlying' video card. The BT948 cards are just busmasters
> > that write into (video) memory/stream ports of the graphics card.
> >
> Okay. I know nothing about YUV. I will forward this message to the kernel
> group.

This has nothing to do with YUV primarily, which is a color encoding scheme.
The issue is the concept these cards exploit to display their image.

			Steffen

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