commit 9d41313e4bd28d3c504c26079cbe4a499e7eceb7
author Yunqing Wang <yunqingwang@google.com> Thu May 01 15:14:39 2014 -0700
committer Yunqing Wang <yunqingwang@google.com> Mon Jun 30 09:36:23 2014 -0700
tree 1dc38de0da1b8a410217322f6e13e9dcc9ca1523
parent a93c506034710a21a0a93a71fff71b794f3f9579

Decide the partitioning threshold from the variance histogram

Before encoding a frame, calculate and store each 16x16 block's
variance of source difference between last and current frame.
Find partitioning threshold T for the frame from its variance
histogram, and then use T to make partition decisions.

Comparing with fixed 16x16 partitioning, rtc set test showed an
overall psnr gain of 3.242%, and ssim gain of 3.751%. The best
psnr gain is 8.653%.

The overall encoding speed didn't change much. It got faster for
some clips(for example, 12% speedup for vidyo1), and a little
slower for others.

Also, a minor modification was made in datarate unit test.

Change-Id: Ie290743aa3814e83607b93831b667a2a49d0932c