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Change-Id: Icbd008d5e973aa5038e857af460e55964fe36b13

Change-Id: I424ff643e6f46216934c96fa9d34a27c46b3e7f2

Change-Id: Ia90ad41050efeec31a92541e9dfc6c46ef75362c

Change-Id: Ibe313aa31ea593d121a1b6078ef8f7849cb58092

Change-Id: I4ad02b76df285526ba6c3b884e6a1335369ba2e9

Change-Id: Ia07c54a0a57d810fea2598eaf4ff2034daa441af

Change-Id: Iaed205ac520e6f4dbec8b406f15598f4f2fbd3f9

The change can be temporarily reverted by setting ALLOW_128X32_BLOCKS
to 1 (for easy "is this better?" testing: we'll get rid of the option
once it's clear what we're doing).

Since this means we have to modify the "num_partition_types"
calculation in functions like read_partition, we move it into a helper
function called partition_cdf_length(). Doing this makes the bodies of
read_partition and write_partition somewhat simpler than they were.

Change-Id: I3573f62f71dc3344aed2dcb3e423e034eb56a7c5

Change-Id: Id39e4231b5ba8e86b92f478185b61d1a5b9eeeeb

Change-Id: I5bd080f1fd5c14ea72ea7eb795eb1b8996a8fa76

Change-Id: I36a4ca8bc0c2390b5731b2a60bdca54e3e37868a

At eob-1, coefficient must be non-zero. As such, this CL changes the
alphabet for base levels at eob-1 from size 4 to size 3. Minor
performance improvement is observed. In addition, changes in 33462 made
by Ola Hugosson were also incorporated.

Now with trained initial probability distributions.

Change-Id: Id6b5d0908b5ff186ed88ab0733ce7cc0c4a468d5

Use 4x2 processing unit.
Reduce # of modes from 6 to 5.

Change-Id: I3c12e18084636de0e279c9102a8b212342faf4c7

The EOB coefficient cannot be 0 and for that reason it has special base_cdf contexts.
Before this commit there was two contexts (DC and AC). This commit adds two additional
contexts to separate the AC into 3 bands (i<=N/8, i<=N/4, i<=N/2).

Change-Id: If088b20fd891920b7ea7fc988d29bf6d86d93bfc

In e72a2091 one lps default probability was accidentally changed from 1 to 128 for
non LV_MAP_MULTI mode. This commit reverts that change and make the change only for
LV_MAP_MULTI mode. Also rather than changing to 128, the probability is changed to 10.

Change-Id: Ia8950379c46c59d40ea388fcd0621bbd78c26ede

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

Change-Id: I6ac62c2825eabcba8f854cfa25c84638d9a73872

This matches the code in read_partition in decodeframe.c and almost
gets rid of the last usage of the "partition_prob" tables which can
now be deleted.

Change-Id: Ibe0e947007d593d8e5f4ab10a38cd920856e566d

This experiment has been abandonned for AV1.

Change-Id: I3501181d096873dec35ea58e4b55530fa76e683f

Remove the previous experiment and now use the same name for a
simpler experiment that only enables 4:1 transforms for 4:1
partitions when ext_partition_types is on, and that which was
previously enabled with the USE_RECT_TX_EXT macro.

Change-Id: Iccc35744bd292abf3c187da6f23b787692d50296

The br_cdf and lps_cdf with a new 4-state symbol br_cdf.
The br symbol indicates whether the level is k, k+1, k+2 or >k+2
In the latter case, a new br symbol is read. Up to 4 br symbols are
read which will reach level 14 at most. Levels greater than 14 are
golomb coded.

The adapted symbol count is reduced further by this commit.
E.g. for the I-frame of ducks_take_off at cq=12, the number of adapted symbols
is reduced from 4.27M to 3.85M. About 10% reduction.

Gains seems about neutral on a limitied subset.

Change-Id: I294234dbd63fb0fa26aef297a371cba80bd67383

This experiment modifies lv_map to make use of multi symbol.

Replace the nz_map and coeff_base binary CDF with a new multi-symbol
CDF of size 4. The new base_cdf indicates for each coeff if the level
is 0, 1, 2 or >2. Two new special contexts are added to be used for the
last coefficient (the EOB coeff). For the EOB coefficient we already know
that it is non-zero. We use one context for DC EOB and one for AC EOB
(this can potentially be refined more).

The new symbol is read/written by special bitreader/bitwriter functions.
Those functions reduce the probability precision from 15bit to 9bit before
the invocation of the arithmetic coding engine.

The adapted symbol count is significantly reduced by this experiment.
E.g. for the I-frame of ducks_take_off at cq=12, the number of adapted symbols
is reduced from 6.7M to 4.3M.

Change-Id: Ifc3927d81ad044fb9b0733f1e54d713cb71a1572

Reduce context model number from 9 to 6.
Let context be two kinds: two reference frames are equal distance
or not.
Also, give equal distance compound weight {9, 7} instead of {8, 8}/16

Reducing context model gives neutral performance.
New compound weight provides -0.14% gain.

Change-Id: I8a3f3021eac9e446ac826e5992f42931af4c8962

This experiment has been abandonned for AV1.

Change-Id: I07be0876b21ee20a1eb2490bb98e4f84978ff001

Include a few RDO fixes that properly account for the extra flag
cost at the right place. Also entropy coding of the flag is made
contexted on tx_size and based on cdf framework.

Change-Id: I52f98ace7e253ccc08917a4a7b517515d1d58a98

Make it work with NO_FRAME_CONTEXT_SIGNALING.

Change-Id: I27813305c68de7042678706c1c9b938b172c3666

Conveys depth from the largest transform size instead of the
actual transform size. Besides, the max depth is now limited
by the macro MAX_TX_DPETH set at 2.

Results: BDRATE lowres (30 frames): -0.005%

Change-Id: I1ccbac8ee18c77b816a6a8f500abfaa7892b21de

This experiment has been cleared by Tapas.

Also, fix a couple of hash signatures in the test while we are at it.

Change-Id: I1658bcb07913cf8bd47cfffadd729e16d5c55fc3

Support cdf for jnt_comp read/write.

Change-Id: I2c29277a8b06b3e9f571355946b70ce0d492fbb2

Tested on screen_content, it has very little impact on compression quality.

Change-Id: I49c7d5e8de8420c0d2af1b327c084a2667cfea40

This experiment implements low-cost delta q signalling on a per-block basis
for all non-inter frame types, which would allow for more efficient AQ
which bases its decisions on temporal information.

Based on an Intel proposal from March.

Change-Id: I18e73d8b12f4caa0b165df12c58ab506271bec03

This will facilitate later experiments reducing the precision
of probabilities.

after_cdf_table_rewrite-3 -> before_cdf_table_rewrite-3

  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

Change-Id: Ief01b4d7fdca075c41e9add079f7ac836dafcfbe

Provisionally adopted on 2017-10-31

(Also an asan warning fix + few non-functional changes)

Change-Id: I2ff4f34f8b20d2eeb567f2e5b1e57b296a97be82

Remove the option of raw data or delta when coding the
segment data, then only use delta coding.

Raw data coding of segment data has been nowhere used but
the option of "raw or delta codig of seg_data" has been coded to a bitstream.

Change-Id: Iaf8f21692452d0c9a127b958812c6151d3c5db05

This experiment has been abandonned for AV1.

Change-Id: I18cf1354df928a0614a1e58b718cd96ee7999925

Development of this experiment will be deferred to AV2.

Change-Id: I3c4615a21b59508500bed8aab0a5c54413b4f284

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

Change-Id: I02ed47186bbc32400ee9bfadda17659d859c0ef7

This CL simplifies context derivation for nz and base level flags in
level map.
1. Reduce SIG_COEF_CONTEXTS from 58 to 42.
2. NZ and base level flags share the same context offsets derived from a
template of size 5 (down from 7).

In limited runs, compression performance seems neutral if not better.
Encoding time for a key frame on a local linux machine is reduced by about 25% or more.

Change-Id: Ibd93b21c839154bc5ae26b993f9e66537cbf5942

This name better reflects the functionality of the mode.

Change-Id: Idc2372e7c7b226f70f63fa4f272a88cb4d857089

Change-Id: Icbedc16b01adf9b48f0f357ec89143462865d54e

At the frame header level, add the checking on whether an inter-coded
frame allows the use of 'skip_mode'. At the block level, add the
decoding of 'skip_mode' for all the blocks if 'skip_mode' is allowed
for the current frame. If 'skip_mode' is set, no further bit needs to
read out, and the block is set as:
- Inter-coded in compound mode;
- With the nearest forward and backward reference frames;
- In NEAREST_NEARESTMV mode;
- In SIMPLE_TRANSLATION motion mode;
- In COMPOUND_AVERAGE compound type; and
- Skip set for residual.

Change-Id: I50297f63a81135109332c4a51b516bffd7726777