Re: [linux-cirrus] Re: Cirrus Logic MaverickCrunch support

On Tue, 2005-02-01 at 09:33 -0700, Matt Porter wrote:

On Tue, Feb 01, 2005 at 04:09:57PM +0200, Bora ?ahin wrote:

quoted

Hi,

Torben> I'm fairly sure that decoding of
Torben> mpeg2 video in most cases would be too slow to consider without the help  
Torben> of some kind of graphical decoder chip.

Unless you use some powered CPU. As it would require to give an example, MPC8540(667-800 MHz) from
PPC family seems ideal for it as a SoC solution...

Even then, this depends completely on what else the platform has to
do as well as what profile/level of MPEG-2 you are decoding. Something
like a ~800Mhz e500 core has no chance of handling a main profile high
level MPEG-2 stream for playback (typically 720p/1080i video). A high-end
(1.45Ghzish) 7457 with an optimized altivec mpeg2 software decode library
and a video card with iDCT assist is about the minimum PPC for these
applications.

Maybe you want to hook up some hardware MPEG decoder to the
Siliconmotion SM501's Zoom Video port.

I'm currently hacking on the XOrg driver for that graphics chip
and could well use a partner in crime ;-)

In any case, if you use a e500 core you want to make sure you get away
with single-precision floating point arithmetics.

-- 
Stefan Nickl
Kontron Modular Computers