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This experiment has been adopted, we can simplify the code
by dropping the associated preprocessor conditionals.

Change-Id: Ic3438799335c6cd05f170302f49bd47e1f705c24

The CL makes the context design for single reference frame coding the
same as that for the compound reference frame coding. There are 3
contexts designed for each of the binary symbols for the single
reference frame scenario, and the designed contexts simply rely on the
counts of the references used in the neighboring two blocks.

Once this CL is merged, the coding of the reference frames, regardless
of single prediction or compound prediction, will all follow the same
context design pattern for all the binary symbols. The design logic is
much simpler and the lines of code for each binary symbol context
identification are reduced by 80%.

Further, this CL has obtained a small coding gain for 30 frames with
the default coding tools:

lowres: avg_psnr -0.015%; ovr_psnr -0.021%; ssim -0.002%
midres: avg_psnr -0.108%; ovr_psnr -0.139%; ssim -0.135%

BUG=aomedia:1402
BUG=aomedia:973

Change-Id: Ia72a1d18e85ac3a05308675b60b95f80f2219c46

Remove deprecated context models for drl index coding.

BUG=aomedia:1208

Change-Id: If255fa93d0c746738f0fc005464388e790c89b63

The experiment is fully adopted.

Change-Id: I6cc80a2acf0c93c13b0e36e6f4a2378fe5ce33c3

This patch uses the neighboring ref counts to design the contexts
for the coding of the first reference frame of a reference pair for
the compound prediction. This aligns the context design with that
for the second reference frame of a reference pair for the
compound prediction.

The new designed contexts are much simpler than that in the baseline.
The number of contexts for each binary symbol is reduced from 5 to
3. Further, the logic for each context only depends on the collected
neighboring ref counts, which is straightforward to derive.

The default CDFs for the first reference frame coding have been
updated using aom_entropy_optimizer.

Experimental results demonstrate a small coding gain for Google test
sets of both lowres and midres, with 30 frames coded for the default
coding tool setup:

lowres: avg_psnr -0.077%; ovr_psnr -0.076%; ssim -0.106%
midres: avg_psnr -0.059%; ovr_psnr -0.066%; ssim -0.037%

BUG=aomedia:1356

Change-Id: I781abbe4616dc3f3a7213ec663946ff9844eb830

Unify the context model referencing for both single and compound
inter modes. Make the context model for compound inter mode coding
independent of the single ones search.

Need to train the model in the final run. Currently provides 0.05%
compression performance improvements.

Change-Id: I9597df4aa293fc7aa2b1becb6dfd68f911d6f278

In preparation for supporting q_adapt_probs.

Change-Id: I4a39b81b0d2c4ceb1586ae411a1216c6c20d896d

Change-Id: I4d80b78ff99806876db3a2ee601f04a783cd77b7

Change-Id: I829da5fc8007589a1323b49eecf6fa741d51c0e7

explicitly disable segmentation when ref frame has different
resolution

BUG=aomedia:1205
BUG=aomedia:1223
BUG=aomedia:1256

Change-Id: I6db51116db308514d572eb465c2453403e64e1f2

Change-Id: Iadaa189717787dbb82e485ff92125ee1ef591496

This is to exclude coding CFL for block sizes where it is normatively
not allowed.

Reuse the alternate CDFs from the --disable-cfl path.

This yields some improvement on subset1:
   PSNR | PSNR Cb | PSNR Cr | PSNR HVS |    SSIM | MS SSIM | CIEDE 2000
-0.0113 | -0.2630 | -0.2138 |   0.0021 | -0.0110 | -0.0157 |    -0.0511

BUG=aomedia:1182

Change-Id: I1e5f23ef7f2debcf8edce788bfa63ec95db4a679

This experiment has been adopted, we can simplify the code
by dropping the associated preprocessor conditionals.

Change-Id: I3e08eec385c40360e3934fa4f66f7c671e860517

Change-Id: Ic9ecd2d4695c24feca109d7e4470b9f1da7a13f0

* Proper re-allocation of seg_map buffer when resolution changes
* Remove undesired resetting of seg_map buffer

* This resolves issues raised in

   https://bugs.chromium.org/p/aomedia/issues/detail?id=1064
   https://bugs.chromium.org/p/aomedia/issues/detail?id=1091

* Disable error_resilient_flag in resize_test as this covers more cases

* Will be enabled by default in separate patch

BUG=aomedia:1064
BUG=aomedia:1091

Change-Id: Ic3f0e47922784c66d240b52d30ba082bdb46dc3b

Removed unused macro USE_TEMPORALFILTER_12TAP as well as related unused
functions.

Change-Id: I547ec4b6d6e7e21fb38043cfd53f7f2dc0e63e1c

At this point, av1_adapt_inter_frame_probs() can be removed.

Change-Id: Ic8f9cc4f6b874aeec84a57fb7dbfacdb33309b51

Change-Id: I7c09b63aadefef3350d713e03b822447c9472509

Removed unused macro USE_EXTRA_FILTER.

Change-Id: Ief6c31c3a9a2e0845e0777e1dcef23f15cbcc898

Change-Id: Ib4b83335ba9c61435f774136bc57638d8b88e963

-Use the CDF values to calculate the cost for ref frame signaling
-Update the cost per superblock
-Fix some errors in the default CDF

Test on midres speed-1 30 frames shows ~0.1% coding gain.

Change-Id: I6f3e5896ef1cae9b515fc8287bc7565d68d05a57

Change-Id: I7c7f193dea8e99be31d048b3fe2b198887a52822

Change-Id: I7498adc3b8627579599f9280c8a3aa0721ed9a4f

At this point, av1_adapt_intra_frame_probs() can be removed.

Change-Id: I7e9f97e8e782b88c10e108230e5d12309460c477

1. code the range of eob in a transform block as a single symbol.
2. initialize cdfs directly.
3. initial cdfs are trained by using laplace prob estimates as in base
level coding (CL 38638)

Change-Id: I65c88d6dd0da3381feeec837928ac5bd81be4296

1. Train and init cdfs directly.
2. Use laplace prob estimates in aom_entropy_optimizer to avoid zero
probabilities.

Change-Id: I878fc0a306cbffe3eb51c5b86d5872459b6705c5

Part2 of ext-warped-motion experiment was removed.

Change-Id: I1b7aebad1fd7cb60d92c3ce959d5101228addae2

Change-Id: I70ebb6ada7ec4a975a8984a2e1ea2fa51664a786

Enable palette mode for
4x4, 4x8, 8x4, 4x16, 16x4, 8x32, 32x8, 16x64, 64x16

0.8% gain on screen_content keyframe coding.

Change-Id: Ic3c089b74171ace9082a0d3ad9e27c8a27553789

Use the number of pixels in a block as context, rather than the bsize
itself. The rectangular blocks therefore share the same context, e.g.
BLOCK_8X16 and BLOCK_16X8.

The number of contexts is reduced from 10 to 7.
Almost no coding performance changes.

Change-Id: Ib3241194580c2b93ad0e953957cdc9188393d055

Clean up: clean up unused entropy related arrays
Bug-fixes: resolve compiling errors when it is enabled with
entropy_stats and ext_skip

Change-Id: I2893e1b5c09e847fb4677f6e62709464208b76f8

1. Use separate contexts for transforms of size 32x32 and above.
2. Initialize cdf directly

Change-Id: I3373143788e81b2547d99e420e591892ef2641a2

This experiment has been abandonned for AV1.

Change-Id: Ib3bb07d62f2025ce50dc9bc1b3f9fc22488519a7

Since we've decided to use guess filter levels for lpf_sb, I remove
unused searching functions and coding paths to make codebase clean
and easy to manage.

Change-Id: I3497add59fc1eaf36acdd0acb85e3bcb6486d01d

Removes unused BLOCK_2X2, BLOCK_2X4 and BLOCK_4X2 from the
BLOCK_SIZE enum.

Change-Id: I964d99718026c51a1eaf30d4a1fc83cc52f94083

Make lpf_sb compatible with loopfilter_level, when USE_GUESS_LEVEL = 1.

Filter levels will be selected based on q index and applied for
filtering on Y, U, V planes separately.

Current model only allows to guess one filter level.
Now Y_vert = Y_horz = U = V. In the future, we need to retrain the
model and get filter levels for Y_vert, Y_horz, U and V separately.

When USE_GUESS_LEVEL = 0, lpf_sb can't work with loopfilter_level yet.

Change-Id: Icd774a147c07a4035cf8204a8754b2a99668bbfd

Change-Id: Ia7d69d8582f8c37ad4b413ccd7e24711b8c3e005

This patch updates also the default cdfs for skip mode. It also remove
the unneeded checking on whether the best obtained RD mode aligned
with the skip mode.

For 30 frames, on both AWCY and Google lowres/midres test sets, with
the following config, the coding gain ranges from ~-0.15% to -0.23%:

--disable-ext-partition --disable-ext-partition-types --disable-txmg
--enable-jnt-comp --enable-mfmv

Change-Id: I39aeeb9e7b27ca679c1b3f9c0eea67b5e1f694e2

Adds spatial prediction to standard segmentation instead of a separate
segmentation feature.
When using temporal prediction skipped blocks are flagged as mispredicted.

Change-Id: I0c32281286d3fbce66d339c9247bcc6516f37a63

Slightly change the way we save and reload frame contexts during
frame setup. For "normal" frames everything is the same, but for
error-resilient and/or intra-only frames, we now:

* Reset the frame context using setup_past_independence()
  (+ extra code if q-adapt-probs is enabled), as usual
* Store this frame context into a special slot in cm->frame_contexts
* Use that slot to fill in cm->pre_fc

The main difference from before is that (for error-resilient/intra-only
frames which are not key frames) we used to throw away the frame
context after setting it up, and would re-use whatever was set up
at the last keyframe.
This was fine when q_adapt_probs is disabled, but it caused an
inconsistency when combined with q_adapt_probs. See the attached
bug report for more details on that.

BUG=aomedia:1104

Change-Id: I9532b6b0e8ae29efbb4f059a0c67a73d7c7828ce