[mpeg2] Re: Driver project: a new 4-channel MPEG decoder card

[Allan Jacobsen <allan@image.dk>]

Warren Young wrote:
> 
> Allan Jacobsen wrote:
> > OK, you are right, but the driver without the library is completely
> > useless.
> > It does not contain anything about: bitrate, resolution, Mpeg1/2 data,
> > program stream/transport stream, audio ac3/mpeg 2, audio bitrate,
> > audio sampling freq. etc.....
> 
> I suppose all that could be handled in software, but at that point you'd
> almost have a software decoder.  I think it much more likely that you
> just feed raw blocks of MPEG data to the card and it deals with them.

Well that is what we do but the hardware needs to be initialised and
told what kind of data is coming.

> 
> This is still completely consistent with the possibility that CSS and
> microcode are in the user mode library.  Microcode's uploaded once on
> board initialization, and a De-CSS operation is very easy on the CPU and
> optional besides.
There is some microcode in the usermode library, but the CSS is in
hardware as far as I know. I dont think Sigma would have been allowed
to make a linuxdriver if it were not.

-- 
MVH / Best Regards
Allan Jacobsen, AJ17-DK