tree cf7d7ebf51360d4fd73bbff0878c4bbd0499815e
parent 8611781f0cf8c4104c99c78a117bf73f4ffdbcf1
author venkat sanampudi <sanampudi.venkatarao@ittiam.com> 1624349994 +0530
committer Wan-Teh Chang <wtc@google.com> 1626736200 +0000

Enable intra_cnn_split for screen contents in intra frames

Added levels to speed feature intra_cnn_split, to introduce less
aggressive partition pruning for screen contents in intra frames.
As screen contents tend to choose larger partitions, the sf
intra_cnn_split is extended to prune split and rectangular partitions
only for screen contents. In this case, none partitions are not pruned.
Partition pruning for screen contents is enabled only for speed presets
5 and 6 in allintra encoding mode.
Also, the name of the speed feature is changed to
intra_cnn_based_part_prune_level to indicate the level of
aggressiveness of pruning.

For allintra video encode (on screen content set),

          Instruction Count        BD-Rate Loss(%)
cpu-used     Reduction(%)   avg.psnr  ovr.psnr    ssim
   5           36.101       4.5634    4.5612      3.7563
   6           13.183       1.1232    1.1270      0.7183

For AVIF still image encode,

          Instruction Count    BD-Rate Loss(%)
cpu-used     Reduction(%)      psnr       ssim
   5           1.565           0.0316     0.0504
   6           0.114          -0.0448    -0.0643

BUG=aomedia:3096

STATS_CHANGED

Change-Id: I3cc72c4ecb159a2922c2f75a4f8a41142662a70d