Adds the CfL experiment flag and computes a block-level DC_PRED that is
required by CfL in order to compute alpha_cb and alpha_cr.

The rate-distorsion impact of computing DC_PRED at the prediction block level
for chroma planes is rather small

Subset 1:
master_no_cdef@2017-04-18T20:37:05.712Z
  -> block_DCPRED_no_cdef@2017-04-18T20:38:07.381
  PSNR | PSNR Cb | PSNR Cr | PSNR HVS |   SSIM | MS SSIM | CIEDE 2000
0.0712 |  0.0337 | -0.1692 |   0.0693 | 0.0814 |  0.0710 |    -0.0063
Note: CDEF was disabled because of problematic asserts.

Change-Id: I44d1cde8605b108366f4bd4cedbf5159dbbb5880

BUG=aomedia:449

Change-Id: I8d1a0342e11877e466a1fb771f9a1941598c95d5

Change-Id: I815d37986119b20ff386c640fe60e41aef785be3

Added 2 tile encoding modes:
TILE_NORMAL mode supports the large-scale tile coding up to 1024 x 1024
tiles;
TILE_VR mode supports the large-scale tile coding and also the decoding
of a single tile.

TILE_NORMAL mode allows the non-vr content to be encoded in multiple tiles
without using the coding tool that are designed for vr applications.

Change-Id: Id804806a1bbcb916b7f5dc7e2c5509d88f3defcb

This creates a central function which defines when a
block should be warped. It also refactors the
WARPED_MOTION code so that all calls to av1_warp_plane
happen in the same location.

No change in performance.

Change-Id: Icaf9ec7700d34523809258594bb9843bb2975f46

Sebastien Alaiwan authored Apr 12, 2017 and James Zern committed Apr 12, 2017

Rename '--enable-aom-highbitdepth' to '--enable-highbitdepth'

Change-Id: I1de13c3508c30c552532993419d8ace326142ab6

Explicitly release the locally allocated memory space in
encode_frame_to_data_rate(). This resolves an memory space leak
issue.

BUG=aomedia:431

Change-Id: I46f4b38b46ed951d42c622e88ce00afc566e7eae

The resizing functions in resize.h and resize.c are useful for the
frame super-res experiment. These functions will be needed in both the
encoder and decoder, so the files have been moved into av1/common.

Change-Id: I66154b7ec0eade0df460c4f4cf8eaa5f663c8904

The loop filter parameters change due to many experiments. The
multi-thread loop filter is built on certain assumptions that would
require changes in many table contents. Temporarily disable the
multi-thread loop filter pass and only maintain the single frame
reference during the development process.

Change-Id: I33a6a7a6fc4299f8fc414ae7f28c5a463af1e12b

Scale the block size in the active map with respect to the
effective mode_info size. This resolves an active map unit
test failure issue due to out-of-bound address access.

Change-Id: Idcd5c318cb475c4e43cc2a41d90028246bf25f37

Change-Id: I2011f113cf6a66a766c1c754b4d47e913ba54689

In preparation for enabling backward updates of contexts for PVQ.
1. Default prob setting for PVQ,
which is based on flat probabilities at the moment.
2. At the end of encoding a frame, average probablities and expected values
of PVQ are copied to the frame context.

Change-Id: I1d087b98e6b0d55ebf8aef696dd986f88197cedf

EXT_TILE: allocate variables on the heap due to the potentially
large number of tiles.

ANS: initialise tile contexts.

EXT_INTER, MOTION_VAR, WARPED_MOTION: fix compilation.

Change-Id: I43a9d01c2442d97b6a8875712f77d932dce3740d

quiets -Wshorten-64-to-32 warnings

ported from libvpx:
710483308 vp9: normalize vpx_enc_frame_flags_t usage

Change-Id: Ice037acb675d1d81bfedf2dfcfa91a8a29a19dfd

Handles a rare divisin by 0 case.
Also adds a check on global motion parameters to disable
if the parameters obtained are outside the range that the
shear supports. This fixes a rare assert failure.
Also changes the recode loop threshold somewhat.

Change-Id: I4c6e74b914ac653cd9caa0563d78b0a19a2a8627

Improves and simplifies costing for global motion to use the
actual bits used to communicate the global motion parameters.
Removes some of the old hacks.
This patch also includes necessary refactoring to incorporate
reference based coding of the motion parameters to follow.

lowres results: -1.489% (up from -1.333%)

Change-Id: I994dc97046011de4261633ccb0c9d71e374f2c5a

Chroma now has a list of strenghts too, with the superblock signalling
shared between luma and chroma.

low-latency, cpu=4:

   PSNR | PSNR Cb | PSNR Cr | PSNR HVS |   SSIM | MS SSIM | CIEDE 2000
-0.0114 | -1.4626 | -1.4745 |  -0.0423 | 0.0430 | -0.0001 |    -0.7416

Change-Id: I389c77f1d80020f810e45f8502c656ad9d397c8c

We now signal joint strengths and use a greedy algorithm for the search.

low-latency, cpu-used=4:

ll4-cdef@2017-03-22T03:42:10.815Z -> ll4-cdef-newsearch-var-header-newlambda-refine4@2017-03-22T15:56:46.471Z

   PSNR | PSNR Cb | PSNR Cr | PSNR HVS |    SSIM | MS SSIM | CIEDE 2000
-0.0792 |  0.3551 |  0.4393 |  -0.0108 | -0.1338 | -0.0141 |     0.1452

Change-Id: I619ae1c7c7d7ec04fe993cabc5773b07c3f5b201

This a simple implementation.
We will use a more precise buffer size for tcoeff once the
experiment functions correctly.

Change-Id: Ib561974f21ee1b8d72ce407882ea2be3cf0b069f

* Dering and clpf were merged into a single pass.
* 32x32 and 128x128 filter block sizes for clpf were removed.
* RDO for dering and clpf merged and improved:
  - "0" no longer required to be in the strength selection
  - Dering strength can now be 0, 1 or 2 bits per block

              LL    HL
PSNR:       -0.04 -0.01
PSNR HVS:   -0.27 -0.18
SSIM:       -0.15 +0.01
CIEDE 2000: -0.11 -0.03
APSNR:      -0.03 -0.00
MS SSIM:    -0.18 -0.11

Change-Id: I9f002a16ad218eab6007f90f1f176232443495f0

This commit implements support for twopass encoding using the xiphrc
experimental rate control system. Most of the code and logic comes
from the theora project encoder.

Currently support is limited to the bitrate targeting mode of the
rate control system and while it does visibly improve quality and does
bring rate closer to the target than the one pass mode there's still
tuning and bug fixing to be done.

Change-Id: Iae0d65bbce5ddfbb95b436e2238a43d6100a23b3

Doing tokenize in the last step of RD loop and then doing packing
tokens in bitstream packing phase is hard for debugging.

Therefore, we create a frame-level buffer to store the txfm coeffs
from the reconstruction in RD loop and then in bitstream packing
phase, we can code the txfm coeffs directly.

Change-Id: I999470eef6e038317a91585df2bdfc20aca3573e

The initial CDF for each frame is stored in
the frame context. CDFs for actual coding are
stored in the tile structures, and these are
what get adapted. The initial CDF is replaced
by an average CDF derived from these tile CDFs.
This is carried forward to future frames when
backward adaptation is on.

CDFs are no longer set from the 8 bit probabilities
in backwards adaptation.

For now, 8 bit probabilities are maintained for
use in the encoder and for symbols which do not
have a CDF.

Change-Id: I106b30510bfad1fa57d077f7702acc1864378a09

The restoration tilesize can be now chosen as either 256, 128
or 64 at the frame header.

Change-Id: I852fc42afedc053484d657bdca522de73aaacd67

Change-Id: Ie20bd0b05bbf3128933f10787aade7b63c98b52a

Change-Id: I378eb5b2c03a4c30d261128bcf9ef00ea987ed40

Split it into two experiments:
q_adapt_probs: multiple initial coeff prob tables based on q-index
subframe_prob_update: multiple backward prob updates within frame

Change-Id: I78041ebd4ba34afc9152f6861225f63c2e8eb686

Removes redundant deblocking filtering operations and buffer copies,
during search for the restoration filters.
Also, makes the order of cdef and loop-restoration consistent.

BUG=AOMEDIA:373

Change-Id: I571e331f9dfadfd2c1494f279e50510ec212ea29

It only handles the realloc constraint (preserving low elements) by
serendipity, and we don't actually rely on that behavior anyway.
Meanwhile the calls may do extra copying that gets immediately clobbered
by the callers.

Cherry-pick from libvpx:
3063c3760 Remove vpx_realloc()

Change-Id: I8dfa89e4a81084b084889c27bd272fdf85184e8d

Change-Id: Id3824c09cbaae814df1d8fb029215f28e8c7a6b1

The result is identical to enabling both deringing and CLPF

Change-Id: I71db5ba9e21fcaf11ad87e94841eaf80be58c0a8

Adds functinoality for least-squares, RANSAC as well as encoding and
decoding with new constrained homographies that warp blocks to horizontal
and/or vertical trapezoids. This is for future experimentation. None
of the models are actually enabled in the code.

Change-Id: I1936018c6b11587d6fd83c3a2c63548cb641b33f

This commit implements a new rate control system which was ported from
Daala's rate control system (which was based off of Theora's rate
control system) to the encoder. Its aim is to address the weaknesses of
the current rate control system and eventually serve as its replacement.

This is still work in progress. So far this commit only implements
support for single pass encoding for constant quality and bitrate
targeting.
Additional commits which implement two-pass support and the rest to
match the feature set of the current rate control system are coming
soon.

The rate control system hasn't been fully tuned (and will likely need
additional tuning as the encoder's development progresses) and does
contain some "hacks", to convert the quality to a quantizer value
(empirical) and to tweak the quantizer in between golden frames (which
uses some code from the current rate control system as well as code
which attempts to model what that code does), the latter of which is
only in the constant quality codepath.

Bitrate targeting works much better than the current rate control
system's targeting and will actually closely match the rate specified by
the user without the current rate control system's bursty behaviour.

Change-Id: I588fbfd2e80a3d21ce7176903115d6a96ef1700a

Allows DomainTxfm filters to be turned off for experimentation.
Also expands the parameter set for the Self guided filters.

Change-Id: I68fdb8e079a2464d80b3a4a990005c49baaaf0b8

The WienerInfo struct requires a 16-byte alignment on x86,
since it contains filter coefficients which are loaded using
SSE aligned load instructions. But on 32-bit x86, the default
alignment of aom_malloc/aom_realloc is only 8 bytes, leading
to occasional segfaults.

To fix this, rather than using aom_realloc to resize WienerInfo
structures, we always free and re-allocate them using aom_memalign

BUG=aomedia:345

Change-Id: Ib1b2a42d4a2fa215dcc81ea481c51271ab068a37

Change-Id: I1050b69045407381d4626b65a0bf6f35957a66f4

This commit renames deblocking_across_tiles to loopfilter_across_tiles, 
to get ready for dering and clpf integration.

Change-Id: Id25b051da9b1e5cb92f35a9619662597462d9537

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

Change-Id: I7a7168f3a2a4d17a03353841a416eff6edf1e241

Change-Id: Ieb2922c3df4ef4f8514b8a6df6f9a8fc45ef3cf4

This follows the naming for the other frame types, and allows libaom
to be compiled against other libraries that also #define NONE.

Change-Id: Ic2e2814587bbc5ea67385a9af775396d29b7dde0