tree d770fe0a5fe94c6363be6a25c591208537d87ec5
parent 06159fcd18b3438bb703a2baff4019aa6393b267
author Yunqing Wang <yunqingwang@google.com> 1396398740 -0700
committer Yunqing Wang <yunqingwang@google.com> 1397001782 -0700

Use source frame difference to make partition decision

Calculate the difference variance between last source frame and
current source frame. The variance is calculated at 16x16 block
level. The variances are compared to several thresholds to decide
final partition sizes.

An adaptive strategy is implemented to decide using
SOURCE_VAR_BASED_PARTITION or FIXED_PARTITION based on motions
in the video. The switching test is done once every
search_type_check_frequency frames.

The selection of source_var_thresh needs to be investigated
further later.

RTC set Borg test showed 0.424% overall psnr gain, and 0.357%
ssim gain. For clips with large enough static area, the
encoding speedup is around 2% to 15%.

Change-Id: Id7d268f1d8cbca7fb8026aa4a53b3c77459dc156