Nicholas S-A wrote:
To be practical, both cost and power wise, this solution would have
to be based on an embedded chip.
AMD Geode processors can be used to make a graphics card. They
support MMX and 3D-NOW. AMD states that they fully support Linux
on these.
http://www.amd.com/us-en/ConnectivitySolutions/ProductInformation/0,,50_2330_9863,00.html
The GX or LX would be a single chip solution. It would be
inexpensive, but I don't know how fast it would be. They have the
advantage of having hardware VGA. The LX is a bit faster than the
GX.
You do *not* want to use the Geode, LX or GX, for video processing
except in a very specialized app. There is actually a discussion on
[EMAIL PROTECTED] right now talking about using OpenGL (read Mesa) on
the LX they use for the XO. It has nowhere near the needed processing
power to run that - I assume any other OpenGL implementations would
be as limited, and would not compete with even 7200-era cards.
They both have 3D-Now and MMX, so this would be what the original poster
suggested. If the fastest (> 1 GHz) LX isn't fast enough for a medium
price video card, then the idea isn't viable. Using a regular CPU
running at over 1 GHz simply isn't practical either price or power wise.
A possibility could be the Xscale and intel 2700:
http://en.wikipedia.org/wiki/Intel_2700G which supports OpenGL ES.
Isn't an X-Scale just a fast ARM? But, yes, using one of the chips --
such as the 81341 or 81342 (dual core) might work for part of the video
board. They have the system bus interface DDR2 & DMA controllers. The
GPU would have to be connected via PCI-X which has points both positive
and negative.
I will read up on the 2700.
Also, this information might be useful to us: The 2700G performs
Inverse Zig-Zag, Inverse Discrete Cosine Transform, and Motion
Compensation to speed up MPEG-1, MPEG-2, MPEG-4 and WMV video
decoding. The accelerator can decode MPEG-1, 2 and WMV at 720x480
(DVD Resolution) and MPEG-4 at 640x480, both at over 30 frames per
second.
These all run at 75 Mhz
75 MHz seems a bit slow. :-D
- It is likely that we will be able to decode slightly better than
this if we implement those features. Given the R&D intel must have
put into this chip, that is probably where 99% of the CPU power goes.
I think that chips intended to make a set-top box might be usable for a
medium price video card which could also decode h.264 HiP 1080p/30 -- it
would also include a sound card.
--
JRT
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