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For ext-intra direcation intra modes:

1. Use neighbor block modes to modify edge filtering strength
   Coding gain (lowres/midres/hdres):
     (8 keyframes)
     PSNR: -0.19 -0.22 -0.10
     SSIM: -0.29 -0.27 -0.13

2. Use context-based cdf to code angle_delta syntax
     (8 keyframes)
     PSNR: -0.20 -0.24 -0.27
     SSIM: -0.29 -0.33 -0.37

3. Filter corner sample:
     (8 keyframes)
     PSNR: -0.01 -0.02 -0.05
     SSIM: -0.03 -0.04 -0.05

Combined Bd-rate improvement for 8 keyframes
     PSNR: -0.40 -0.47 -0.40
     SSIM: -0.57 -0.60 -0.51

Change-Id: Id47ac17b6bf91cd810b70cacfc5b457341f417f3

Change-Id: I0e6f7ab981e31f7120105515f6204568b6dc82d3

Change-Id: Ib36a8df1a3ebddbf4320fb7b9b5537041bddc3a3

Use br-node approach, which can be easily turned into multi-symbol
if desired.

Change-Id: I40df5178ab299af24d347d91f01a88dbfc9305a6

Change-Id: I2ae2a33574bc3072561e696a31e0ea2e0770afa9

Reduce number of modes from 10 to 6, and disable fi modes in UV.
To reduce complexity, apply filter directly without subtracting
the estimated means.

Change-Id: Iaf78d92d31e4a7cc30ea7863b57a9611c5f503e6

Change-Id: I32c5015bedef07f58413c679b4aaf30651a357b9

Change-Id: Ic8670dcfed8efa37050816bbb8062f9092886ef7

This commit makes the following changes to level-map coding
	1. Encode and decode eob position first
	2. Context derivation for non-zero flags
	3. Single pass in optimize-txb

lowres 0.33% gain

Change-Id: Ia2b6cfd70425f49ac021454d42d5950bfcfab50a

This experiment has been adopted.

Change-Id: Ife4c18a59791268b7ac0de5a8a08e762a042cae2

Change-Id: Id377c68e30031ad4697ca1ba311487b803a8af4c

Enable it as it is adopted.
Fix some compile warnings and compatibilities.

Change-Id: If324e749e27ffa42f69a19ad5ebb39bc493b33ec

Change-Id: I262d9b538988ddcbcac13a217c786fa5df17f8a4

Change-Id: I5bff0a68602a89ce480fec049c8b2c4bce44f6bb

Change-Id: I9d3f0380865790d8adcb85f03305b193bc1949d7

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

Change-Id: I4705652ac8231ee25f960e8096dc97c2aeed1d20

This experiment uses switchable interpolation filter for intra
prediction. Current gain is too small to be useful for AV1.
May explore more for AV2 in the future.

Change-Id: I24ae8c75dc71adf6271eabdb68a81b68a0869fa2

BUG=aomedia:907

Change-Id: I30a0290e499d338250343b5f9092bdcabe7d867a

Make fi mode index entropy coded instead of using raw bits. Mode
cost estimation in key-frame RDO is updated as well. Modification
to inter frame RDO is not included in this patch.
Also key-frame y mode cdf table is re-trained since fi modes are
attached to DC_PRED

Key frame BDRate:
-0.399% lowres, -0.339% midres

Change-Id: I9ccf478b0a2e48fb1870fe8451e45e2c858a5f63

Count filter level reuse, sign, and delta. And use counts to train
default cdfs.
Default cdf tables updated.

Change-Id: If4fbf3e06ec7d568d940ca7b170bbbb4b778f176

In this experiment, sharp image discontinuity in the predicted
block is detected. Based on this discontinuity, we choose
particular LGTs as row and column transforms.

Bitstream syntax, entropy coding, and RD search for LGT are added.
One binary symbol is used to signal whether LGT is used. This
experiment can work independently with the lgt experiment.

lowres: -0.414% for key frames, -0.151% overall
midres: -0.413% for key frames, -0.161% overall

Change-Id: Iaa2f2c2839c34ca4134fa55e77870dc3f1fa879f

Change-Id: I5446327378938128f27186015619a079c2845d53

Reduce the context model size for key frame modes from 30240 bits
to 4500 bits, i.e., less than 1/6 of the original context model.
The coding performance loss on key frame is 0.14% for lowres and
noise level difference for video sequence. The loss on key frame
for midres is 0.05% and noise level for whole video. The change
on hdres kf coding is 0.015%.

Change-Id: I9e36825e5c5ee6ba35038c3ca349ad1ad3429910

Hard code av1_ext_tx_ind[] and av1_ext_tx_inv[].

Change-Id: Ife650d41be3f85d048f5585659ad57e03f54b39b

Change-Id: I0b6f56d2bf0482cfbf45525828d6daa6aea187e5

No performance change for scenario --disable-ext-comp-refs. For
--enable-ext-comp-refs, a pretty tiny bitrate saving was resulted
(-0.01~-0.02%).

Change-Id: I7d12b28408bbfecc762108cbcf186b2a6ea07253

When experiment LOOPFILTER_LEVEL is on, there're four base filter levels
for each frame. This patch enables one to use one delta or four deltas
to update corresponding filter levels for each superblock in
EXT_DELTA_Q.

1 bit per frame is sent through bitstream to select one or four deltas.
Now, we hard code to use one delta.

Change-Id: I9c61a035064fa81878b0575ad21664e2b22a6a45

The _ind and _inv mapping tables are not necessary. The CDF tables are
updated with new values converted from the old tables. Performance
impact is small and neutral.

Change-Id: I65845ab3c80f88794abd9ab9e61494af56099c7c

The probabilities and CDFs were tuned using aom_entropy_optimizer tool.

midres: -0.062 overall PSNR, -0.100 on SSIM
(but significant gain on Keiba_832x480_30.y4m clip:
-1.331 on overall PSNR and -1.903 on SSIM)
lowres: +0.013 on overall PSNR, -0.062 on SSIM

Change-Id: Ie143a3914ef45939c8744ff6b2ed9f1d0a59353e

Before LOOPFILTER_LEVEL, there's one filter level,
now we have four filter levels for y plane vertical,
y plane horizontal, u plane and v plane.

This patch enables experiment LOOPFILTER_LEVEL to support per
superblock loop filter level update.

Change-Id: Ib11a1564471eb3076c26e73e5cdf7b5a3045ef97

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

Change-Id: Ic077963f72e8cc2ae9872b58c8a0241988384110

tx_size is transmitted using CDFs now, so these tables are obsolete.

Also, remove a related tx_size_totals table.

Change-Id: I949b46c1c9499bc556e68c77adbdb5aa3288c9a2

The updates in this CL are for the scenario when ext-comp-refs is off.

For --disable-global-motion --disable-ext-tx --disable-ext-comp-refs
--disable-convolve-round, the patch obtains a small BDRate gain for
PSNR: lowres -0.08%; midres -0.05%

Change-Id: I47d1ba93318e2904b5714f62ffd6af056f4eb588

Change-Id: Ieb28f40d85e4db4af33648c32c406dd2931ceb89

Change-Id: I52f204000f5fdaf1c6fff63949d72e858ceea462

Change-Id: Ief98301e44a63faacd5f8725f89ef4e0c596a591

Observe 0.1% gain on lowres wo optimize_b before rebase

Change-Id: I0cb5b5e4be2563093efb2f6dfbefdce9b554e910

CDFs are used for coding and costs, so there is no need to
base the CDF on the obsolete tree and remap filter indices.

No change to common test conditions BDR.

Change-Id: I441dd21b127bc07ba33eef8ddcfd147eef21d0d4

Change-Id: I3d6a440b13473b0d1e8b18c6629c7e8e3fb446ae

It's not being used anymore, replaced by the CDF model.
The counters are moved under the entropy-stats experiment, so that they
can be used to tune the default CDF values.

Change-Id: I50cb170c4c8699cf7317fd77853b3fedf2342d3e