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Reduce the number of contexts from 10 to 6.

BUG=aomedia:830

Change-Id: If0ec302816975293b7dbd164c867feb66fa76847

Change-Id: I03adc36f5e5f839d23c4f50a864d317d008e30a6

This assert was wrong for tx sizes of 4x4 (and 2x2), and was causing
some failures on AWCY like this one:
https://arewecompressedyet.com/?job=debargha-adopted-0927%402017-09-28T00%3A03%3A48.310Z

Change-Id: Ib75ba7ec6282c700cbe1742b9871a5489eb7e18c

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

Change-Id: Ic077963f72e8cc2ae9872b58c8a0241988384110

BUG=aomedia:851

Change-Id: Ib188f4b640a58c47147cda977a589e527f765a54

This hides behind --enable-ext_partition_types_ab. When that flag is
set, the mixed partitions change from

   +-+-+---+          +-+-+---+
   |   |   |          | | |   |
   |---+   |    to    | | |   |
   |   |   |          | | |   |
   +-+-+---+          +-+-+---+

(that's PARTITION_VERT_A; other partitions change similarly).

Since 128x32 and 32x128 block support hasn't yet been merged, this
patch also temporarily disables these partitions for 128x128 blocks.

Change-Id: Ic479c0fc129f590b8ad56d72dc98ba79ae1bd1cf

Move functions related to frame index in natural order setup into
a root experiment.

Change-Id: Iebc71514b951dbb658cf0e1c3d42bb2b180d830f

Coefficient prob model was removed earlier in
https://aomedia-review.googlesource.com/c/aom/+/17062, so these were
unused and updating them was a wasted effort.

Change-Id: Ibd5fd975134de8eb3d363c500cb0f07c4658efd1

Change-Id: Ieb28f40d85e4db4af33648c32c406dd2931ceb89

Change-Id: I52f204000f5fdaf1c6fff63949d72e858ceea462

Remove code that is dead since 65c00ae1.

Change-Id: Id74b96fbfbd70ebb293650601a36b9ea3b495055

Allows saving bits when reference buffer is not to be used in
cases where error resilience is unimportant.

Change-Id: I2ef002a7cce96a158e1e58c2b00f0a6846049fff

Experiment LOOPFILTER_LVL has 4 deblocking filter levels for:
y plane horizontal, y plane vertical, u plane, and v plane.

The patch supports segment updates for each of the four filter levels.

Change-Id: I494e8d9ab67e37c5f6234b8d9db8e3e3abf70d52

With ext-partition and tx64x64 enabled, the encoder could choose
TX_64X64 to encode the transform for a subsampled plane of a
BLOCK_128X128 block. This broke an assumption in the nested loop in
write_tokens_b and also caused bug 827 (with a rather cryptic
failure).

This patch changes get_vartx_max_txsize to ensure that the encoder and
decoder don't think they can use TX_64X64 in this situation. It also
adds a couple of assertions to the loop mentioned above so that if
something comes unstuck it'll be much more obvious what went wrong.

BUG=aomedia:827

Change-Id: Ie093f2f20f6242949d68e950c8f95b100867ee17

1. seg->temporal_update flag is only read when seg->update_map flag is
set to 1 in the bit stream. in case update_map flag is different from frame
to frame, the temporal_update flag will not be reset to 0 when
update_map flag changed from 1 to 0. i.e, the previous temporal_update
flag will be used in the later process. in the read_inter_segment_id
function, temporal_update flag is used to read the segment id. it will
cause bit stream parsing error.

Change-Id: I663975bc84bbed7409d4f5dd1c1005480b2fbcf8

Although they are called "sync codes", nothing is synchronized
using them.

Change-Id: I2dbd67daf9f4822438323212bb96cac489c38c5d

This experiment offset the filter tile grid 8 pixels upwards.
Deblocked pixels (rather than CDEFed pixels) are used for the
2 lines above and below the filter processing unit. The 8 pixel
offset is the offset produced by deblock/cdef. This way the
loop_restoration does not need additional line buffers in a
single pass hardware implementation.

Change-Id: I89e0831dc28413a5d3e02d7a426ce2885ab629d7

This is just a code cleanup, moving the calculation of cm->tile_rows
and cm->tile_cols into get_tile_size, which is already calculating
cm->tile_width and cm->tile_height. The patch also gets rid of a
spurious AOMMIN and replaces it with an assertion.

Change-Id: I46666c4a197ac26d4b3746d9ea6575dc4af0d570

This fixes global motion read/write mismatch.
Minimal test case would be 3 encoded frames with:
    1) frame0: KEY frame
    2) frame1: INTER frame with refresh_frame_flags not 0x00 and
not 0xFF, say 0x01 (refresh first slot)
    3) frame2: INTER frame with all reference indices equal to 3
(i.e. no reference to frame1)

When decoding frame2 decoder will use cm->prev_frame=frame1
for gm params decoding, then switch to cm->prev_frame=frame0
for the rest of the frame.
This makes frame2 dependent on frame1 which is not used as reference.
And also it is different from what encoder does.

BUG=aomedia:750

Change-Id: I42ba19c03d909286af12ba3149910693a12249e8

When deciding whether the top-right or bottom-left blocks are
available, we currently always act as if we're using 128x128
superblocks. This means that, when using 64x64 superblocks,
we sometimes conclude that blocks are available when they haven't
been decoded yet!

This typically happens at, for example, mi_row=15, mi_col=16
(for bottom left), where we're at a 64x64 boundary but not
a 128x128 boundary.

This patch fixes the issue by checking based on the signalled
superblock size.

Note: Most of this patch is just threading 'cm' through the
intra prediction process, so that we have access to cm->sb_size
in has_top_right() and has_bottom_left()

Change-Id: I126964c510aafffc870e7cd8b3e64a46abb14b3a

This patch is designed to complete the CONFIG_MAX_TILE experiment.
It adds the following features:
- Explicit tiles of same width can be signalled with command line --tile_width
- Explicit tiles of same hieght can be signalled with command line --tile_height
- max_tile now works with the depenedent horizontal tiles experiment
- additional checking added to ensure maximum number of rows/columns <= 64
- one fix to the tile group code for when the number of tiles is not a power of two

Change-Id: I749a68fdb3dcdd8d1ced2b3558f3817e4b832c06

This fixes decoder's capability to start decoding
bitstream from non-KEY intra_only frame.

BUG=aomedia:816

Change-Id: Iecd5add418590119f59a51acd7208eb08cb17042

Change-Id: Id6f588876b1adf68abd8c17d7eef2223d552e457

Set filter step = 2, such that 3 bit can represent [-14, +14] filter
level difference.

Tune threshold for reusing filter level between previous and current
superblock.

Change-Id: I6f26377591f3e93f7c068e4aa4279ae9bc2c9522

PVQ has been broken again since the experiment flag for palette is removed
in commit c6300aa1.

As a fix, if PVQ is enabled then disable both of --tune-content=screen and
automatic detection of screen and use of palette coding tool.

Change-Id: Iea6bb042b4402163805c44dabfb3f4c05dfd4e23

Like for intra block in intra frames, an extra call to
txfm_rd_in_plane is added to the RDO of intra blocks in inter frames.
This extra call is performed using the best parameters found during
RDO and the reconstructed luma pixel are stored.

Results on objective-1-fast (compared to CfL on Intra frames only)

   PSNR | PSNR Cb | PSNR Cr | PSNR HVS |    SSIM | MS SSIM | CIEDE 2000
-0.2497 | -3.5526 | -3.5048 |  -0.2456 | -0.2392 | -0.2508 |    -1.4811

https://arewecompressedyet.com/?job=cfl-no-inter%402017-09-13&job=cfl-inter%402017-09-13T14%3A13%3A13.918Z

Change-Id: I70ea2c01859b6c55d7c3eb9680d492c0bfc2aad4

For each superblock, its filtering range is shifted up and left by
8 pixels (half of the maximum loop filter length), such that
estimation of deblocking filtering will not cross two superblocks.

Change-Id: I82244b7c26ab8b2ac553037b3bb1fe1d82bf5704

Signal one bit to indicate whether current superblock reuses filter
level of previous superblock.
Try filtering and compute sse using previous filter level and search
the best possible filter level. If their diff is less than predefined
threshold, current superblock reuses previous level. Otherwise,
signal the best filter level.

Change-Id: Ibf125860883b774ef2464b62bb8b799b48258c64

The compressed header is now used only when the refresh
type is set as forward, i.e. in error resilience and
frame parallel modes. As long as backward updates are
used the header is disabled thereby saving bits.

Change-Id: Iee9f66ffbd30ef3552ea41b75e4b51537cd9ff97

Removes setup in compressed header so that the compressed
header can be skipped.

Change-Id: I8d7ed63944a4f75704222f4ad7d0159db1cec0d1

Change-Id: I3d6a440b13473b0d1e8b18c6629c7e8e3fb446ae

This patch moves the sb_size to the keyframe header from all frame
headers as discussed in the AOM Codec WG meeting.

Change-Id: Ia0190e57b36b98e51ab61ad4ff14f24f9c294877

For the first superblock, signal a filter level (6 bit).
For other superblocks, signal the delta (3 bit) and sign (1 bit).
To guarantee the delta can be represented by 3 bits, the search
range of current superblock filter level is capped as
curr_lvl = prev_lvl +- ((1 << 3) - 1)

Change-Id: Ibbe2941aa96ec1220ed2adb7edf3d29cb032f0ec

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

Use common structure for inter and intra tx type information when
possible.

Change-Id: I1fd3bc86033871ffbcc2b496a31dca00b7d64b31

Search and pick filter level for each superblock after the entire
frame has been encoded. And then apply loop filtering using
selected filter levels.

Now it can't work with LOOPFILTER_LEVEL. Y, U, V planes share the
same filter level.

Per superblock, filter levels are signaled via bitstream.

Future work: move selecting filter level into each superblock
rather than wait for the whole frame encoded.

Change-Id: I46cb994ec4866abb0456146f7c3cae8813c1d52e

Change-Id: I78bb38e3d61d74442278bd5ed1c4f695b7c8e24a

Currently, when new-multisymbol and ext-comp-refs are
both enabled, the comp_ref_type_prob and uni_comp_ref_prob
arrays are forward updated in the compressed header, but
their values are never used.

We can save a tiny bit of space by not signalling the
forward updates at all; as a side benefit, we can wrap
the whole of read_frame_reference_mode_probs() in
a #if !CONFIG_NEW_MULTISYMBOL block.

Note: It seems the encoder already does this; I think
the reason it doesn't cause mismatches is because we
effectively pad the compressed header out to a full byte,
and av1_diff_update_prob() reads a bit with a very high
probability of being 0.

Change-Id: Ia1fca05ee498609c98c7ea1f89578f6783357d7f

This adds the tool CONFIG_MAX_TILE
Uniform tiles are implemented using power of two number of rows or columns.
Maximum number of rows or columns is 64
Explicit tiles will follow in a later commit once the command line API is updated for this

Change-Id: Ia8d22e7f4aa779448211496c644937afdf037228

Change-Id: Ic3c93a5d2e427ce1ed578389196a265245063821