tree 6878ff9ffe29703546bde7c75eba6d1e4a5fd161
parent cf71f3afb2e0e4f41cc826fad4caaecad7328708
author Ravi Chaudhary <ravi.chaudhary@ittiam.com> 1545398245 +0530
committer Yunqing Wang <yunqingwang@google.com> 1545946560 +0000

Use weighted averaging of CDFs in enc row-mt

In case of row-based multi-threading of encoder, since we always
keep a top-right sync, we can average the top-right SB's CDFs and
the left SB's CDFs and use the same for current SB's encoding to
improve the performance.

Using weighted averaging i.e., giving more weight (75%) to left
SB’s CDF and less weight (25%) to top-right SB’s CDF, further
helps in reducing the BD rate gap between enc row-mt and tile-mt.

STATS_CHANGED for row-mt.

Change-Id: Ic66a4710b198d649f6077d7437d789c96e743d4a