For speed 3 and above, such search is only allowed at speed 3.
The change helped cif and stdhd set by 1.2% and .7% in compression,
but increased the encoding time by around 5%.

Change-Id: Ifa4832327f1c1bef3decb032ceb769cbf50e059f

The end_useage parameter  is confusingly named since it
now actually defines the rate control method used.

Change-Id: I98912caabfe556b7af0b939a645d1336409e4d71

This commit enables a background detection approach for adaptive
quantizer control. It combines the cyclic refresh pattern and the
background information to determine the segment id for adaptive
quantizer selection, prior to the non-RD mode decision process.
It hence allows proper quantization information update for a more
precise rate-distortion modeling in the non-RD mode decision.

The compression performance of speed -5 for rtc set is improved
by 2.5%, at no speed change.

Change-Id: Ic3713e8ed9185b403b5b1679d19dabd57506d452

Change-Id: I0f2592ecfc5197dfb94975260cb2f862315e7895

lost in the shuffle of:
4fd63175 Remove duplicate code in test/webm_video_source.h

Change-Id: I89792fa17f03920616c55486bbdaf56c6461c9eb

Change-Id: I35f948fe1ac107950c8d8e4ba06e5a95ac4ec30e

Change-Id: I802308de4817e48a627bb44a744d32010fe7818f

Change-Id: Ifd008968326e61ab492162351e358bf0ac0dac0a

Change-Id: I983364b33e8f103b43a0448821e890989176f1cc

The right value is calculated and set in vp9_pick_filter_level().

Change-Id: I5f725ac21f90dc9b80181a09a2040970bf6671d4

Change-Id: Id48edd12c6f649c82113128491ef6ea7410e93b2

Change-Id: I922d988486b47f413d11a8eeb38532a484d15c80

Remove duplicate WebM parsing code in test/webm_video_source.h and linking it
against webmdec.c which does the exact same thing.

Change-Id: Ib7152eecde890fca58be42028cab18c9cb54221c

Remove call to warn() in webmdec.c so that it does not depend on
tools_common.c for compilation.

Change-Id: I2790e837985ce1d84b35f5a20c783d0e6020a9f5

Use the correct buffer to update the coding mode decision for
sub8x8 blocks.

Change-Id: I091ef27d2047eeb8b73ceb7c2c7c45b38ba8c6d5

Change-Id: I43de248615b79828d5164b670e7358b8a520d075

Change-Id: Idca7c1cd8a12df465c58b6ba064a99404b3b4bce