What fraction of work is iDCT?
Jeffrey W. Baker
jwbaker at acm.org
Mon Jun 25 18:57:40 CEST 2001
On Mon, 25 Jun 2001, Eugenio Jarosiewicz wrote:
> (Jeff: I'm cc'ing you as I don't know if you're on the list)
> Ok, so someone else who knows more about this than me already gave you
> some #'s. But of quite interest might be:
> Altivec IDCT sample plus much more...
> ( I wish I had done a more completesearch earlier )
> Jeff - have you taken a look this? I'm very interested about getting
> this into VLC for OSX and ppc in general. I don't know much about
> vector processing but the concept seems fairly straightforward.
These are the routines I have plugged into VLC. I am having a problem
though that keeps me from testing it. When I start VLC, it simply reads
the blocks off the DVD as quickly as it can, without playing any video. I
haven't had a chance to debug this problem, and I think it is unrelated to
the vectorized IDCT. It may be related to the new firmware Apple
downloaded ont my DVD-ROM, but Xine still works OK.
Still, nobody told me wether 377,000 IDCT iterations per second is fast or
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