Enable real-time version reference motion vector search

Multimedia / WebM - Jingning Han [google.com] - 26 June 2014 11:49 UTC

This commit enables a fast reference motion vector search scheme. It checks the nearest top and left neighboring blocks to decide the most probable predicted motion vector. If it finds the two have the same motion vectors, it then skip finding exterior range for the second most probable motion vector, and correspondingly skips the check for NEARMV.

The runtime of speed -5 goes down pedestrian at 1080p 29377 ms -> 27783 ms
vidyo at 720p 11830 ms -> 10990 ms i.e., 6%-8% speed-up.

For rtc set, the compression performance goes down by about -1.3% for both speed -5 and -6.

46ea9ec Enable real-time version reference motion vector search
vp9/common/vp9_mvref_common.c | 175 -----------------------------------------
vp9/common/vp9_mvref_common.h | 175 +++++++++++++++++++++++++++++++++++++++++
vp9/encoder/vp9_pickmode.c | 108 ++++++++++++++++++++++++-
3 files changed, 280 insertions(+), 178 deletions(-)

Upstream: git.chromium.org

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