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When allow_partition_search_skip  is set the two pass code
can optionally skip the partition search in the rd loop if the image
appears static (based on selection of 0,0 motion).

Unfortunately 0,0 motion does not necessarily mean that there are
no meaningful changes or that motion or intra modes will not be selected
in the second pass.

Disabling "allow_partition_search_skip" may hurt the encode speed a little
for a small number of clips but can have a big impact on compression.
The most notable example of this in our test sets is "bridge_close_cif"
where this change gives a gains of 18%, 12% and 16% in opsnr, ssim and
psnr-hvs.

Change-Id: I765e288b5c0cd82bce00a148e7653a21e9203024

Removal of parameters to and code in calc_frame_boost() that is no
longer required.

No change to results from previous patch.

Change-Id: Ic92da35613fdc247d22fddf24d09679fc5329017

The decay accumulator clause covers similar ground to the
new clause that tests the accumulated second reference error
so it has been removed to reduce complexity.

Change-Id: I4ec1cce32d72bd4ee463ad7def2831a68447d525

Add a clause to the breakout test for alt ref groups that
examines the size of the accumulated second reference
frame error compared to the cost of intra coding.

This clause causes a reduction in the average group length for many
clips. Alongside the change to the group length the minimum
boost is increased.

On balance the results are positive for psnr and psnr-hvs
but is negative for ssim/fast ssim for the smaller image formats.

Strong gains on some harder clips (eg ducks take off (midres) ~20%,
husky (lowres) 6-17%. Most of the negative cases are lower motion
clips. Subsequent patch hopefully will help with those.

Change-Id: Ic1f5dbb9153d5089e58b1540470e799f91a65dc4

Change-Id: Ic10ba580fd5da7d6ff7fa0f33db72fb0c1a97801

VPX_ENCODER_ABI_VERSION was bumped up in 93e83f.

Change-Id: Id5707f9f9db56fa96549bc8f54e1cfa04e7fa4cd

Change-Id: I92e4dba2d1682a0d77ad9a214ec4312b1cf4d42e

For new VP9 only content type adjust  the rate distortion and ARF
filter based on the relative spatial variance of the source and
reconstruction.

In regards to the RD loop the method favors modes where the
reconstruction variance is similar to the source variance. However it
is currently only applied to regions where the source variance is quite
low.

For very low variance blocks it applies a further bias against intra
coding and large prediction block sizes (the later in particular limit
the usefulness of the loop filter).

The final part of this change is to lower the strength of the ARF
filter for blocks where the source has very low spatial variance, to
encourage some low amplitude texture or noise to pass through
the filter.

This change improves the retention of film grain and fine noise /
texture in spatially flat regions, but as expected causes a significant
drop in PSNR on many clips. This is to be expected because similar
but misaligned noise or texture will give a lower PSNR than a flat
noise free reconstruction. However, it is worth noting that most clips
show a strong gain in FAST SSIM.

The features are enabled on the vpxenc command line by setting
--tune-content=film.

VPX_ENCODER_ABI_VERSION bumped for this change and cvbr.

Change-Id: I26a4e4edfa3dc5cacead82fa701fe7a9118ccd0a

Removed three parameters that are no longer needed in calls
to calc_arf_boost() and associated minor changes.

No impact on encode results.

Change-Id: Ieaf31d0d2e1990b99cf69647170145a1bbfbb9fb

SSE2 instrinsic vs AVX2 intrinsic speed gains:
blocksize   16: ~1.33
blocksize   64: ~1.51
blocksize  256: ~3.03
blocksize 1024: ~3.71

Change-Id: I79b28cba82d21f9dd765e79881aa16d24fd0cb58

For choose_partitioning (speed >= 6): avoid computation
of minmax variance for non-reference frames in SVC.

Existing condition only avoided this for speed >= 8.
Combine that existing logic with non-reference condition.

Small speedup (~0.5-1%) for 3 layer SVC,
neutral change on avgPSNR/SSIM metrics.

Change-Id: I3e9f3a1af0647b15e475cf170d9402908d672ee5

For SVC with 3 spatial layers:
Add feature to copy/upscale partition from middle spatial layer
to the upper/highest resolution, when superblock sad is not high.

Enabled for speed >= 7 and only for non-reference frames.

Speedup ~3-4%, small loss in avgPNSR/SSIM of ~1%.

Change-Id: I7f0a2716c0fde28bade0f86159d11b7e31d6ab8d

Change-Id: I7364a157de39eb7137b599808474b8d46d19d376

SSE2 asm vs AVX2 intrinsics speed gains:
blocksize   16: ~1.00
blocksize   64: ~1.17
blocksize  256: ~1.67
blocksize 1024: ~1.81

Change-Id: I2a86db239cf57e3ff617890ccb2d236aba83ad5e

For a chosen interval "i" the existing arf boost calculation examined frames
+/- (i-1) frames from the current location in the second pass.

This change checks to make sure that the forward search does not extend
beyond the next key frame in the event that the distance to the next key
frame is < (i - 1).

Small metrics gains on all our  test sets but these are localized to a few clips
(e.g. midres set psnr-hvs sintel -2.59% but overall average was only -0.185%)

Change-Id: I26fc9ce582b6d58fa1113a238395e12ad3123cf6

The new test will run a SVC bitstream which has non ref frames.
It checks the number of buffer acquired and released to make sure all
external frame buffers are released.

Add a new test bitstream:
vp90-2-22-svc_1280x720_1.webm
which has 400 frames in total, and 1 spatial layer and 2 temporal layers.
There is one non ref frame every other frame.

Disabled for now. Will be enabled with the fix.

BUG=b/68819248

Change-Id: I0515336fd9809a9e1fceba90e4dce53dabaf53a5

Added command line control of Corpus VBR.

The new corpus vbr mode is a variant of standard
VBR (end-usage=0) where the complexity distribution
mid point is passed in rather than calculated for a specific
clip or chunk.

The new variant is enabled by setting a new command line
parameter --corpus-complexity to a zero value. Omitting
this parameter or setting it to 0 will cause the codec to use
standard vbr mode.

The correct value for a given corpus needs to be derived
experimentally using a training set such that the average
rate for the corpus is close to the target value.

For example our using our low res test set with upper and lower
vbr limits of 50%-150% and a corpus complexity value of 650
gives a similar average data rate across the set to using standard
vbr. However, with the corpus mode easier clips will be allocated
fewer bits and harder clips more bits rather than having the same
rate target for all.

Change-Id: I03f0fc8c6fb0ee32dc03720fea6a3f1949118589

For nonrd_pickmode: if early_term is set there should be
no need to include UV in rdcost (when color_sensitivity is set).

Neutral change on RTC and RTC_derf metrics, for speed >= 5.
No change for ytlive metrics.

Very small speed gain (~0.5%) on some clips with strong color content.

Change-Id: Ifc00928ecd935fc71e94935ceef0ae7481249f07

The added AVX-512 support requires the subset of AVX-512 added in Skylake-X.

Change-Id: I39666b00d10bf96d06c709823663eb09b89265b7

Allow for compound prediction mode in nonrd_pickmode for ZEROMV.
For real-time encoding, 1 pass with non-zero lag-in-frames.

Added speed feature to control the feature.
Enabled for speed >=6 for now, under VBR mode.

avgPSNR/SSIM metrics positive on ytlive set, for speed 6:
some clips up by ~3-5%, some clips neutral gain, average gain
across clips is ~1%.

Small/negligible decrease in speed.

Change-Id: I7a60c7596e69b9a928410c5ee2f9141eecd8613d

Even though frame_size is calculated in uint64_t, it winds up in an int
size value.

This was exposed with the msan test because the memset is called with
(int)frame_size, leading to a segfault.

Change-Id: I7fd930360dca274adb8f3e43e5e6785204808861

Remove the memory deallocation on the early exits.

Change-Id: I00b4a814ae6705105ecab89644d055ca3311d9f4

Move vt2 to heap.
Reduce the stack usage from ~87K to ~44K.

BUG=b/68362457

Change-Id: I8f5f93712934d59a8cc4564378172d409a736a2e

Change type of sum_square_error from int64_t to uint32_t.
Change type of sum_error from int64_t to int32_t.

This reduces the stack usage from ~131K to ~87K.

BUG=b/68362457

Change-Id: I147d7c7b226bceb4f0817bb86848e1fa9d9ac149

swap '{' and c-style comments removing a few redundant ones along the
way; covers most leftovers from the clang-tidy run against an
x86_64-linux config.

Change-Id: I67a45596f80a12389faca49c5be440875092a7df

Eliminates the following instruction for the x86 (64 bit)
intrinsic code:

movslq %esi,%rax

Change-Id: I8f5ebd40726f998708a668b0f52ea7a0576befae