commit 321794c4d5d46a28b57585a875cce376d90efbb7
author Yue Chen <yuec@google.com> Fri Apr 08 17:28:26 2016 -0700
committer Yue Chen <yuec@google.com> Fri Apr 15 17:03:20 2016 -0700
tree c7d32a994b2aea1e8137712b61d5f19c68c3179c
parent 454989ff324e98528b1f3e3a57ed2c69c5bb9547

Optimization for EXT_INTER + OBMC combination

In the rd loop, check the perf of obmc, whose mv is copied from regular
inter predictor, when wedge interinter is better than regular inter
(previously it will force allow_obmc = 0). The condition of the early
termination before this step is relaxed to avoid skipping too many obmc
predictions. The rates of the overhead are properly calculated for these tools.

The logic of the bitstream syntax:
(a single ref) the interintra flag is sent first, only if it is 0, we
send the obmc flag;
(compound refs) the obmc flag is sent first, only if it is 0, we send
the wedge interinter flag

Coding gain
lowres: 0.428% (2.287%->2.715%)

Change-Id: I5f3a34640b398e313cbf84235c9fe2073eb2173f