For coding block sizes <=16X16, if the block is determined to be skin,
then always allow for that block to be candidate for refresh. So if that
block happens to be on the boost segment(s), segment won't get reset to 0
and delta-q will be applied.

PSNR/SSIM metrics neutral (little/no change) on RTC clips.
Speed increase small/negligible (< 1%).
Some visual improvement on faces in a few RTC clips.

Change-Id: I6bf0fce6f39d820b491ce05d7c017ad168fce7d6

reduce the register count by 1 to avoid xmm6 and unnecessarily
penalizing the other users of the base macro

Change-Id: I59605c9a41a31c1b74f67ec06a40d1a7f92c4699

Replace MMX with SSE2, reduce mem access to left neighbor,
loop unrolled.

Change-Id: I941be915af809025f121ecc6c6443f73c9903e70

MMX replaced with SSE2, same performance.

Change-Id: I2ab8f30a71e5fadbbc172fb385093dec1e11a696

MMX replaced with SSE2, same performance.

Change-Id: Ic57855254e26757191933c948fac6aa047fadafc

In 32-bit build with --enable-shared, there is a lot of
register pressure and register src_strideq is reused.
The code needs to use the stack based version of src_stride,
but this doesn't compile when used in an lea instruction.

This patch also fixes a related segmentation fault caused by the
implementation using src_strideq even though it has been
reused.

This patch also fixes the HBD subpel variance tests that fail
when compiled without disable-optimizations.
These failures were caused by local variables in the assembler
routines colliding with the caller's stack frame.

Change-Id: Ice9d4dafdcbdc6038ad5ee7c1c09a8f06deca362

H/V intra mode was only enabled for bsize < 16x16,
enable it also for bsize=16x16.

Metrics are neutral with this change:
Overall very small gain (0.1%), small visual gain on some RTC clips.

Change-Id: Ib2d7a44382433bfc11cf324aa3cc5c382ea9e088

Replace MMX with SSE2, reduce psadbw ops which may help Silvermont.

Change-Id: Ic7aec15245c9e5b2f3903dc7631f38e60be7c93d

Change-Id: I3ec08e10d9ebf6d8b8a03004a320523f926e5cc4

This also fixes a compiling error under --enable-vp9_highbitdepth.

Change-Id: I9d1dcb95d3336d797eb3c23a4702c30b04355357

Change-Id: I1a9635a9948458e6c83f5b58764b7e720d98e2ea

Change-Id: I837551bdf87197bee8a193353bb31f4cff794787

* changes:
  Fixed interval, fixed Q 1 pass test patch.
  1 pass VBR mode bug fix.
  Fixed interval, fixed Q 1 pass test patch.

This reverts commit e15fedb9.

Change-Id: Ibf2bce008c727a9754f88814b7630095fa7b8253

For testing implemented a fixed pattern and delta, 1 pass,
fixed Q, low delay mode.

This has not in any way been tuned or optimized.

Change-Id: Icf9b57c3bb16cc5c0726d5229009212af36eb6d9

(copied from VP9)

The one pass VBR mode selects a Q range based on a
moving average of recent Q values. This calculation
should have been excluding arf overlay frames as these
are usually coded at the highest allowed value. Their
inclusion skews the average and can cause it to drift
upwards even when the clip as a whole is undershooting.

As such it can undermine correct adaptation of the allowed
Q range especially for easy content.

Change-Id: I9e12da84e12917e836b6e53ca4dfe4f150b9efb1

For testing implemented a fixed pattern and delta, 1 pass,
fixed Q, low delay mode.

This has not in any way been tuned or optimized.

Change-Id: Idf5ee179b277fa15d07a97f14f2ce5bbaae80a04

The one pass VBR mode selects a Q range based on a
moving average of recent Q values. This calculation
should have been excluding arf overlay frames as these
are usually coded at the highest allowed value. Their
inclusion skews the average and can cause it to drift
upwards even when the clip as a whole is undershooting.

As such it can undermine correct adaptation of the allowed
Q range especially for easy content.

Change-Id: I7d10fe4227262376aa2dc2a7aec0f1fd82bf11f9

The culprit is on the decode side xd->lossless[i] setup was in wrong
location where segment features are not yet decoded.

Also on the encoder side, transform mode was not set consistently
between when tx_mode is selected and how tx_mode is enforced in
tx size selection.

Change-Id: I4c4c32188fda7530cadab9b46d4201f33f7ceca3

Change-Id: I0fe95332ccfa2e1ad2a01a8e7ddd631289e0f8eb

Keep track of frame indexes for the references, and
constrain inter mode search for reference with same
temporal alignment.

Improves speed by about ~15%, no noticeable loss in
compression performance.

Change-Id: I5c407a8acca921234060c4fcef4afd7d734201c8

Change-Id: I7bc991abea383db1f86c1bb0f2e849837b54d90f