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This commit refactors the rate-distortion optimization scheme for
transform block coding. When both ext-tx and var-tx experiments
are turned on, the encoding time for bus_cif at 1000 kbps goes down
from 706377 ms to 666503 ms (5.6% speed-up). The coding statics
remain unchanged.

Change-Id: I20835db573725580aad79c16220f799ce01f2093

Change is only for real-time mode, speed > 5, and non-screen content mode.
Bias is based on block size and motion vector level (motion above some threshold).

Helps to improves stability in background from lightning changes.
PSNR/SSIM metrics on RTC set almost no change/neutral (within +/- 0.1).

Change-Id: I7eac13c1ae10be4ab1f40acc7f9f1df5653ece9d

Jenkins per-commit test need to be expedited as more experiments are
added into the nextgenv2 branch. This patch does the following:

thread test: change the length of test clip from 5 frames to 3 frames;
only test speed 1.
ArfFreq test: marked as "large".

The tests marked as "large" will be removed from per-commit test
(to nightly test).

Change-Id: I62b373c52b481dcd281e741ebf5098408a97ff4d

Only use non-zero threshold(s) for breakout if
the motion level of the current tested mode is low.

Change-Id: I22aae961cc42371b49d3f648560181cc54708502

Change-Id: Id5b8f597fb275395232559fea7bfeb56912b88a1

This commit re-works the rate-distortion optimization scheme for
transform coding. It improves the overall compression performance.
For derf set, the ext-tx experiment provides 2.27% coding gains,
and the new scheme that integrates multiple transform type selection
and recursive transform block partitioning provides a total of 3.24%
coding gains.

Change-Id: Ia1887c4c44b73dfb915d091d96660a99f09d5cc3

Current threshold is little too strict.

Change-Id: I99ec1409d095e0c2fd3b7ab398742cabcc05700b

This commit hooks up the rate-distortion optimization system to
fully exploit recursive transform block partition and multiple
transform type. The compression performance of the two experiments
largely adds up. For derf set, ext-tx provides additional 2.1%
coding gains on top of the gains due to recursive transform block
partition (0.69%).

Change-Id: I1091fb9545f74e489a6a2489dc3c12f5abd05043

Correctly compute the block size in bit-stream coefficient token
packing. This fixes an enc/dec mismatch at very high bit-rates.

Change-Id: I37bf084731dc660df0c695cad406ddcd0f9eb904

Change-Id: I174f5b41be384894e41b8e2926cbf8fd0f8e21b2

Do memset to fix msan issue due to the access of uninitialized
memory.

BUG=https://code.google.com/p/chromium/issues/detail?id=549155

Change-Id: I02f995ede79e3574e72587cc078df1a0d11af002

Source noise level estimate is also useful for
setting variance encoder parameters (variance thresholds,
qp-delta, mode selection, etc), so allow it to be used also
if denoising is not on.

Change-Id: I4fe23d47607b4e17a35287057f489c29114beed1

Change-Id: Ia59724413c4a4831390119a33d40a7d713b4b69f

This can help increase encoding speed substantially.

Change-Id: Id0c009146e6e74d9365add71c7b10b9a57a84676

Change-Id: I38952cd55b91f35e5db45bc8e6a20ef25069c464
--ext-refs:   extended references - for multi-ref in nextgen
--ext-inter:  extended inter - for new_inter/copy_mode in nextgen
--ext-interp: for new interpolation

Change-Id: I60461f011d1aba0b1eb6584c6940f745221915f4

This commit allows the loop filter to account for the recursive
transform block partition when selecting the filter and mask.

Change-Id: I62b6c2dcc0497cbe1f264b03c46163f55d2c9752

This commit refactors the loop filter selection process to support
variable transform block sizes based filter mask. It disables the
multi-thread loop filter implementation to simplify the experiments.
The speed impact on speed 0 encoding is negligible.

Change-Id: Ia470b6da9ad833fe6eb72d2cbeda9296b21910ec