[Theora-dev] VP3 Compatibility and SIMD Optimizations

[Timothy B. Terriberry]

Let's try this with Reply-To-All... you'd think I'd've done this enough 
times to get it right by now.

VP3 data cannot quite be fed to libtheora directly. Some small fixups
need to be done to the frame header (you can look at the transcoder
(http://svn.xiph.org/trunk/theora-tools/theora_transcoder/) for details
of what needs to be done).

The experimental decoder has more algorithmic optimizations than the
current mainline. While I was in a meeting I see j^ has already
summarized the current SIMD efforts in progress.