[Ffmpeg-devel] snow and cmp functions

[Loren Merritt]

What would be the cleanest way to add 32x32 cmp functions to dsputil? 
particualrly w97 and w53, where they aren't equivalent to 4 16x16 calls.
Currently, all(?) code in lavc uses literal numbers for dsputil table 
indices, so I can't easily bump the numbers up, and some code also assumes 
the indices are in order of decreasing size.

The 32x32 functions would be useful for snow's obme, since we compare the 
whole area of support for one motion block, and don't want unnecessary 
wavelet edge effects in the middle of the block.

--Loren Merritt