tree 3d4f6f155692096057a0f77a3d5b9c69e3f0abda
parent 736466423666cd65792285bb199377d3acf603d5
author Yunqing Wang <yunqingwang@google.com> 1578621949 -0800
committer Yaowu Xu <yaowu@google.com> 1578755327 +0000

Prune interpolation filter search

Prune interpolation filter search based on previous frames'
filter selection stats. Calculate probabilities of each filter,
and prune the search at prediction block level. Currently, this
feature is turned on at speed 5.

Borg test(150 frames) results:
       avg_psnr:  ovr_psnr:  ssim:   avg speedups over whole set:
lowres: 0.153     0.163      0.149         1.6%
midres: 0.145     0.158      0.070         1.8%

STATS_CHANGED

Change-Id: I21edcc76ac30b2fd2eec8f5efd7edeb2c7119cbf