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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

Avoid resetting current_q_index.

Change-Id: I76d27605b6a8c0cd6b1032e24ea5ca8561115e5a

Let jnt_comp work with compound_segment. When frame distance weights
are used, compound_segment blending is turned off. When normal compound
mode is used, compound_segment blending is searched. The rdcost should
select between {frame distance weights, normal compound,
compound_segment blending}.

Change-Id: I162d1d204ba6a5976538357d9dbc71fc5b1aa8d5

Change-Id: I0e6f7ab981e31f7120105515f6204568b6dc82d3

Select the best compound_idx in rd.
The rate/cost for compound_idx and their ctx will be in patch 4.

But there's a bug for now if we don't encode one more time using the
selected compound_idx. It remains a issue to be solved in the future.

Change-Id: I5e1ba51da2b6ab5bacd8aba752dda43bd2257014

Change-Id: Ibfeb424bf0ebab7bbeb69f6f6df24a4f4924ec97

Change-Id: I2ae2a33574bc3072561e696a31e0ea2e0770afa9

Change-Id: I255be6e0193dd6b91424ce53ed41aeaaeb1c01a7

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

This is more precise than the dist functions it replaces.

Results on Subset1 (compared with previous commit with CfL enabled)
  PSNR | PSNR Cb | PSNR Cr | PSNR HVS |   SSIM | MS SSIM | CIEDE 2000
0.0634 | -0.9188 | -0.9429 |   0.0609 | 0.0722 |  0.0593 |    -0.3226

Change-Id: I955a7d7eceea50482edb40b0d1041b300e3c9042

Change-Id: I2405656d1151559420b101fc51ceae8a6ba5ca56

Change-Id: I32c5015bedef07f58413c679b4aaf30651a357b9

This experiment has been adopted.

Change-Id: Ife4c18a59791268b7ac0de5a8a08e762a042cae2

This is to reduce the size of the huge token buffer by at least more
than 10%.

BUG=aomedia:940

Change-Id: I2ee7f7f62e8e8fb819cf7fba40a7ca7f860acaa4

Change-Id: Id377c68e30031ad4697ca1ba311487b803a8af4c

Removes a bunch of unused code.

Change-Id: I86bda117d8d455452ee1ee3a2a566742650e05e0

Change-Id: I5873d6caa8304fdc1b5fc668b05204f5e5fb73c1

Change-Id: I457edba98dd1ebbd212651247d6c0d1a34f780d6

Since CB4X4 is adopted and without it the codec does not work,
it is better to remove it and simplify the code.

Change-Id: I51019312846928069727967e3b2bbb60f0fba80d

Disable this feature unless the entire block is within the frame.
The reason is, rd decisions in mbmi, e.g. inter_tx_block[][], made
for blocks partially out of the border can be partly nonsense
therefore cannot be reused by blocks at other locations.

It caused an infinite loop when encoding a clip with repetitive
patterns. A cross-border block has an invalid big tx stored
in inter_tx_block[0][1] and the other block (same residue, within
frame) reused this mbmi, which makes encoder never reach the
termination condition when tx blocks are being recursively
partitioned.

BUG=aomedia:913

Change-Id: Id25a1dbc4a68b5136f6bdf9f6b5811b7ec6920b0

get_scaled_luma_q0(-alpha_q3, pred_buf_q3[i]) is NOT equivalent to
-get_scaled_luma_q0(alpha_q3, pred_buf_q3[i]). When the product
alpha_q3*pred_buf_q3[i] is an exact multiple of 32 (0.5 in Q6), then the right
shift will round both positive and negative values towards infinity, creating a
bias. So, e.g., get_scaled_luma_q0(-4, 8) will yield 0, but
-get_scaled_luma_q0(4, 8) will yield -1.

Results on Subset1 (compared to parent With CfL enabled)
  PSNR | PSNR Cb | PSNR Cr | PSNR HVS |   SSIM | MS SSIM | CIEDE 2000
0.0000 |  0.0000 |  0.0000 |   0.0000 | 0.0000 |  0.0000 |     0.0000

https://arewecompressedyet.com/?job=cfl-no-round-fix%402017-10-07T11%3A50%3A47.711Z&job=cfl-round-fix%402017-10-07T02%3A15%3A51.359Z

Change-Id: I8a7900c32fbd7213f1ed4e09c3626c063800e186

Change-Id: I79ad4261af5f6843fc0c533327baf15c36cec2ad

Change-Id: I16f1ddfd59760a49c2184b88bf285fa86960d3be

Change-Id: I3df4789de2a8c34f725a770128e2062e01efb3b0

Change-Id: I262d9b538988ddcbcac13a217c786fa5df17f8a4

Calculate rate costs of interintra and wedge interintar symbols
based on cdfs that are per-sb updated.

Change-Id: I4fa73953cb0bccbf078d2e2dd4e90370972fcce1

The modification is only applicable to palette_y_mode and
palette_uv_mode. Welcome to make changes to other palette syntax.

Change-Id: I7bf0a49c06a3986475076fe291e26f4b783b8ab9

Added more asserts for dist-8x8 running in PSNR mode,
i.e. with the encoder option "--enable-dist-8x8=1"
instead of --tune=[cdef-dist | daala-dist].

The asserts checks whether a 8x8 distortion measured on reconstructed 8x8 pixels
is identical to the sum of distortions from sub8x8 partitions (or tx blocks for
var-tx case).

Change-Id: I14f2b24e674a9cbbe60e663449fc4e7f46f0e481

Introduces two new TX type pruning modes that provide better
speed-quality trade-off compared to the existing ones. A shallow
neural network with one hidden layer trained separately for each
block size is used as a prediction model. The new modes differ in
thresholds applied to the output of the neural net, so that they
prune different number of TX types on average.

Owing to relatively low quality loss PRUNE_2D_ACCURATE is used
by default, regardless of speed settings. Starting with speed
setting of 3 we switch to PRUNE_2D_FAST mode to get better
speed-up.

Evaluation results:
----------------------------------------------------------
Prune mode | Avg. speed-up | Quality loss | Quality loss
           |(high bitrates)|   (lowres)   |   (midres)
----------------------------------------------------------
PRUNE_ONE  |     18.7%     |    0.396%    |    0.308%
----------------------------------------------------------
PRUNE_TWO  |     27.2%     |    0.439%    |    0.389%
----------------------------------------------------------
PRUNE_2D_  |     18.8%     |    0.032%    |    0.063%
ACCURATE   |               |              |
----------------------------------------------------------
PRUNE_2D_  |     33.3%     |    0.504%    |     ---
FAST       |               |              |

Change-Id: Ibd59f52eef493a499e529d824edad267daa65f9d

Removes some stray CONFIG_CB4X4 config macros.

BUG=aomedia:921

Change-Id: Icc65e0b000f659d7fb18178c928a7bff7879f58c

Change-Id: I5bff0a68602a89ce480fec049c8b2c4bce44f6bb

Support recursive tx block partition.

On the screen content testset, 0.2% gain for keyframe encoding.

Change-Id: I623e6fbb910fef9c91617e02edf420019f67d189

Change-Id: I3dcf3dfb849aadc9a9e9d06bb6cf22dfe2acf073

Fixes a build failure when using 'make dist'

Change-Id: I8f63724678ce68328ef9ad2328e9a5015d6faf48

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

Since BLOCK_4X16 and BLOCK_16X4 are listed with higher enum value than BLOCK_8X8.

Change-Id: I36cdd4d33dfb2f3a01fa03c8eb8be26d8055dc43

Change-Id: Ic701ef1439d6d1d3d7801bb3ec4aebe9ad6e3acc

While finding the reference MV for a block, if one neighbouring block's
motion mode is warped motion mode, instead of directly adding that
block's MV to the candidate MV list, we use that neighbouring block's
warped motion parameters to compute a MV for the center point of the
current block, and then add that MV to the candidate MV list.

Borg test result:
             avg_psnr ovr_psnr ssim
cam_lowres:  -0.507   -0.514  -0.685
lowres:      -0.114   -0.122  -0.180

The change is added under ext_warped_motion config flag.

Change-Id: I3ce6290a1fd512b613eab5d7620c8bcb08f189a6