Hi, Since a lot more documentation for the VIA chips was released recently, I decided it was a good moment to see if I could get MPEG2/MPEG4 acceleration working for the CX700 chip on my EPIA EX15000. I made some progress in studying and disassembling the original VIA XFree86 drivers on (CX700XF40064-kernel-src_20060222d) viaarena.com. I've done linux driver by reverse engineering before, although for less complex hardware. Then again, there actually are quite some pieces in the provided source, the remaining binary-only part is relatively small.
At the moment I have good hope that I could get it to work, if I spend enough (probably considerable) time on it. However, this brings me to the point of this mail: how relevant is this decoding-ability? This depends on the decoding performance of the chips, relative to the decoding performance of the CPU itself. And I cannot find hard information about the first . With proper hardware decoding performance, can I expect a (say) 1GHz C7 to handle MPEG2-HD on 1080i or 720P? And what about MPEG4? All info I could find just says 'MPEG4' is accelerated, but what bitrates are feasible, and is this MPEG4-ASP, or MPEG4-AVC (aka H.264)? I am guessing decoding blueray would be out of the question, but some hard data would be appreciated. I understand that VIA cannot give us proper documentation for the video decoders, but I suppose they could tell more about the possible performance. Or is there already information available on this, that google doesn't want me to have? ;-) Thanks in advance for any thoughts or information on this. Groeten, Bart -- Bart Hartgers - New e-mail: [email protected]
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