tree 63df43062ac1c2f63fb02f300e2ed52a1b5376ea
parent 5de6114e8fc708b8230f75745e0c58aed7ac05ff
author Jingning Han <jingning@google.com> 1406071940 -0700
committer Jingning Han <jingning@google.com> 1406072943 -0700

Enable chessboard inter prediction filter type search

This commit enables a chessboard pattern prediction filter type
search scheme for rate-distortion optimization speed-up. For the
inferred motion vector modes, the encoder can re-use its above/left
neighbor blocks' prediction filter type and skip a full test on
all possible filter types. Such operation is turned on/off
alternatively in a chessboard manner.

It is turned on in speed 3. For test clip pedestrian 1080p, the
runtime is reduced from 231500 ms -> 221700 ms. The compression
performance is changed:
derf:  -0.147%
yt:    -0.134%
hd:    -0.079%
stdhd: -0.220%

Change-Id: I1912f278e7576c2dc632688e3ad7a257410c605a