Preparation for merging EOB_TOKEN. The block_zero value
corresponds to the first EOB_TOKEN: other EOB_TOKEN values will
be merged with non-zero values.

Change-Id: I94036783ee240fa916a79c544ecd716a9c24fa59

Change-Id: I6c1717ad82d05ebe22327aec6989af2c0db336e3

These are optimized for EOB_TOKEN being associated
with the current position, not the previous.

CBP tables cover EOB_TOKEN for the the whole block.

This change causes a performance regression until
EOB_TOKEN is merged into the coding scheme.

Change-Id: Ica3a12ed97285cbae204ce3cc1a7e658ebcacc9f

Zero, one, and two or more coded as one symbol (head).
Remaining tokens coded as a tail symbol.

The pareto CDF distribution is adjusted to cover tokens from
two onwards.

Change-Id: I98b33fab6b9f52690f6ad618ac55e725a97be056

This commit makes the daala-ec work in the cb4x4 mode. As compared
to --enable-experimental, --enable-experimental --enable-cb4x4
improves the coding performance by:

lowres 2.6%
midres 1.2%

Change-Id: Ifee6f011c80364492c4a547513d24eb2958b5a56

Minor performance changes
0.03% better on lowres
0.01% better on midres

Change-Id: I7a7168f3a2a4d17a03353841a416eff6edf1e241

BUG=aomedia:310

Change-Id: I8e1a1c6d59e3d14ba132d2bbf4e203da26538bde

Change-Id: I148d60d56599a238c60c429572a25cbddbe5191d

This commit enables the adaptive scan order system support
rectangular trnasform block sizes. It resolves the coding failure
when rect-tx or var-tx are enabled.

BUG=aomedia:143

Change-Id: Ic565284e811e3f7e0ebf2e08fb3748257ce8a049

This commit adds 2x2 transform block scan order to make the
adaptive scan order support cb4x4 mode.

BUG=aomedia:135

Change-Id: Ic8c3ae9ed65d577df629524b617b386b5e799d4c

These are under EXT_TX + RECT_TX experiment combo.

Results
=======

Derf Set:
--------
All Intra frames: 1.8% avg improvement (and 1.78% BD-rate improvement)
Video: 0.230% avg improvement (and 0.262% BD-rate improvement)

Objective-1-fast set
--------------------
Video: 0.52 PSNR improvement

Change-Id: I1893465929858e38419f327752dc61c19b96b997

Change-Id: I5c2e92469d8f87f7c565acd77f12535b3f58929a

Also fixes a bug with rectangular transforms

Change-Id: Id459c18d8fdc767678452e0b20c4168a412f4de7

Adds 64x64 default scan orders
Adds 64x64 coefficient entropy models (just copy the 32x32 ones)
Entropy context updates for 64x64 transform
Various misc. changes to support 64x64 transforms

Change-Id: I2c0bc4ba540886dd196e87a78b205407ad3e866b

The rans experiment is dead. The ans experiment with the ec_multisymbol
experiment also turned on takes its place.

Change-Id: Ie9f30ec7cf73aae6b2ea580a7b1f208485a8a7a7

Change-Id: I26b02e6578ad2d82aadfe1df2aeb84e6c11a747b

The rectangular transform syntax is by default supported, hence
no need to put it under the experimental flag. This does not change
the coding statistics.

Change-Id: I3a147503d973a03400f8a86e11f07c7d754e6234

Ensure that cdfs are synced with pdfs after every
forward update.

Change-Id: I5677f78300156c8622f1728d7a343ff6c3a4ea64

The new ec_multisymbol experiment supersedes the rans experiment and is
used for multisymbol features that can be backed by either daala_ec or
rans.

This experiment is automatically enabled by ec_adapt and will try to
enable daala_ec or ans (in that order).

Change-Id: Ie75b4002b7a9d7f5f7b4d130c1aacb3dbe97e54f

Make the codec support 2x2 tranform block unit for chroma components.

Change-Id: Ic454535bd5620abe88a2e99789160cc4664ee518

Replace enum items with range definitions.

Change-Id: Iba2b7cac657db5fb6177cb5c9e6f40ec0125d926

Change-Id: Ia09edf92bf9f7ecacc65c232ac6e656cde236634

last_frame_type is not well defined for intra_only frames
if we are decoding them out of order.
This change removes a dependency on last_frame_type for these frames.

Change-Id: I440cac68792714de222e192a0b3e75f6e1aa5e4b

Performance improvement
        BDRate
lowres  0.921%
midres  0.730%
hdres   1.019%

Change-Id: I26208d6c0531937bff44de505b4ea355c7852802

Ensure that cdfs are synced with pdfs after every
forward update.

Change-Id: I5677f78300156c8622f1728d7a343ff6c3a4ea64

The new ec_multisymbol experiment supersedes the rans experiment and is
used for multisymbol features that can be backed by either daala_ec or
rans.

This experiment is automatically enabled by ec_adapt and will try to
enable daala_ec or ans (in that order).

Change-Id: Ie75b4002b7a9d7f5f7b4d130c1aacb3dbe97e54f

The (new) ans experiment replaces the bool coder with uABS bools. The
'rans' experiment adds multisymbol coding.

This matches the setup in aom/master.

Change-Id: Ida8372ccabf1e1e9afc45fe66362cda35a491222

This causes rANS to operate at the same precision as the Daala EC.

aom/master stats: rans10uabs8lbase12 → rans15uabs8lbase15

objective-1-fast
PSNR YCbCr:      0.01%      0.01%      0.01%
   PSNRHVS:      0.01%
      SSIM:      0.01%
    MSSSIM:      0.01%
 CIEDE2000:      0.01%

subset1
PSNR YCbCr:     -0.01%     -0.00%     -0.00%
   PSNRHVS:     -0.01%
      SSIM:     -0.01%
    MSSSIM:     -0.01%
 CIEDE2000:     -0.01%

(cherry picked from aom/master commit ddbc2e2a)

Change-Id: I6ef0a4f6198784b3712a61af9f105d560a22eaea

(cherry picked from aom/master commit 11206c60)

Includes renames in a bunch of places not handled by the original
due to differing tree states.

Change-Id: Ic74d9d8850b8c80a51e55e425bbf472a67e2653f

This brings it in line with the Daala CDFs and will make it easier to
share code.

Change-Id: Idfd2d2b33c3b9b2c4e72ce72fb3d8039013448b9
(cherry picked from aom/master commit af98507c)

This can be re-added after aligning AOM's ANS with nextgenv2's ANS.

This partially reverts commit 3829cd2f.

Change-Id: I78afc587f1abfe33ffcd53b3262910cfae135534

It's used in both encoding and decoding. Matches (historical)
implementation in aom/master.

Change-Id: Ib009b6b6023cfe69e99a0a92f3c70f4416fcdb47

Reconciles the following commits from aom/master to nextgenv2:
- 25aaf40b
- 87073de5

Change-Id: Ideda50a6ec75485cb4fa7437c69f4e58d6a2ca73

Update block number in update_scan_order_facade

Change-Id: I6710f983472b1b67ee85dd3151a5ea564828420e

Change-Id: Ibf9fd8c1b8c800bcb8a74b13eb1549c14560b585

This causes rANS to operate at the same precision as the Daala EC.

rans10uabs8lbase12 → rans15uabs8lbase15

objective-1-fast
PSNR YCbCr:      0.01%      0.01%      0.01%
   PSNRHVS:      0.01%
      SSIM:      0.01%
    MSSSIM:      0.01%
 CIEDE2000:      0.01%

subset1
PSNR YCbCr:     -0.01%     -0.00%     -0.00%
   PSNRHVS:     -0.01%
      SSIM:     -0.01%
    MSSSIM:     -0.01%
 CIEDE2000:     -0.01%

Change-Id: I6ef0a4f6198784b3712a61af9f105d560a22eaea

The nonzero prob is updated by update_scan_prob()

Change-Id: I0c96bab2dc29938103b4b668653585198ff7a5c8

Make the codec support 2x2 tranform block unit for chroma components.

Change-Id: If428abeb55fd772bdd74da0d0449b436f60eb0e3

clang-format authored Sep 07, 2016 and James Zern committed Sep 15, 2016

Change-Id: If22018f8911d9d7ee99c2127bdfcc56e42b0e2d7

Change-Id: Ia09edf92bf9f7ecacc65c232ac6e656cde236634