Re: Video Overlay on C3200

On Tuesday 13 March 2007 22:52, Tim Chick wrote:
> I looked into it further, and did some experiments with the cacko
> mplayer.
>
> The cacko mplayer is compiled with iwmmxt - you need this to get the
> MPEG4 arm assembler. I did not realise the h263 function was being
> used for h264, along with some of the other stuff iwmmxt implements.

I've got iwwmxt working now. The video decode time for a 30 second clip 
drops from 37 to 28 seconds. It should be easy enough to make the 
iwmmxt stuff select itself at run time - indeed there is already some 
code to do this, but I don't think it works quite right.

It still ends up being worse than cacko (24 seconds), which I think may 
be due to the DMA load of using another overlay for OSD. I'm going to 
take a look at disabling the overlay when it is not in use sometime. Or 
use a lower depth (I'm using 16 bit at the mo).

So how about clock frequency changing on the c1000 using OZ? I could 
take a look at some of the work if pointed in the right direction?

Thanks,
Tim


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