tree d3174c5c8986b0b291f75dda4f65c04761912c4f
parent 8a927a1b7a6cad191e842fd51431a3a7d2fb0698
author Jingning Han <jingning@google.com> 1427738969 -0700
committer Gerrit Code Review <gerrit@gerrit.golo.chromium.org> 1427754007 -0700

Use SATD based mode decision for block sizes below 16x16

This commit makes the encoder to select between SATD/variance as
metric for mode decision. It also allows to account chroma
component costs for mode decision as well. The overall encoding
time increase as compared to variance based mode selection is about
15% for speed -6. The compression performance is on average 2.2%
better than variance based approach, with about 5% compression
performance gains for hard clips (e.g., jimredvga, nikas720p, and
mmmoving) at lower bit-rate range.

Change-Id: I4d04a31d36f4fcb3f5f491dacd6e7fe44cb9d815