[x264-devel] Re: Difference in cost functions
Loren Merritt
lorenm at u.washington.edu
Thu Jan 18 13:03:23 CET 2007
On Tue, 16 Jan 2007, Axel Gunter wrote:
> Can anyone explain what is the difference between COST_MV(), COST_MV_X3_DIR()
> and COST_MV_X4 macros? All three appear in the me.c file.
COST_MV tries one MV and keeps it if it's better than the previous best
MV. COST_MV_X4 is equivalent to 4 calls to COST_MV, but is faster due to
some assembly optimizations. COST_MV_X3_DIR does 3 COST_MV()s, except it
doesn't compare which MV is best, only computes the cost of each.
--Loren Merritt
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