This commit changed the encoding and decoding of intra blocks to be
based on transform block. In each prediction block, the intra coding
iterates thorough each transform block based on raster scan order.

This commit also fixed a bug in D135 prediction code.

TODO next:
The RD mode/txfm_size selection should take this into account when
computing RD values.

Change-Id: I6d1be2faa4c4948a52e830b6a9a84a6b2b6850f6

Merges the experiment.

Change-Id: I4eb19af6de6df6aa3a96a2e82f231d47ed9b3ae9

Change-Id: Ib07d1e707a87cec98ea3a1779fccca078d8c4310

Cleans up the experiment. Actually uses reduced counts for backward
updates, and reduced number of probabilities in the context.

No change in bitstream when the experiment is on.

Between expt on and off:
derfraw300 is down only -0.062% (which is better than when expts
were run previously).

Change-Id: I55285a049a0c22810bdb42914212ab5a4f8521b5

Replace B_DC_PRED like syntax element writing/reading with sb_ymode
set (e.g., DC_PRED, etc).

Change-Id: I293006a6b3bcd130c08ea9f053e7a79c6819c6f8

The new code is 0x49, 0x83, 0x42

There is nothing particularly special about this code bitstream wise.
Its derivation is the word "sync" coded using 4x6bit alphabetic indices.

Change-Id: Ie2430a854af32ddc5a5c25a6c1c90cf6497ba647

The recursive partition type search is enabled down to 4x4, 4x8 and
8x4, followed by the corresponding rate-distortion optimization for
the per-partition encoding mode decisions.

The bit-stream writing/reading synchronized in supporting the
rectangular partition of 8x8 block.

This provides above 1% coding performance gains on derf.

To do next:
1. re-design the rate-distortion loop for inter prediction below 8x8.
2. re-design the rate-distortion loop for intra prediction below 4x4.
3. make the loop-filter aware of rectangular partition of 8x8 block.
4. clean the unused probability models.
5. update default probability values.

Change-Id: Idd41a315b16879db08f045a322241f46f1d53f20

Change-Id: Ica75bdd4905c4a04b7f92795d0b8ce6836a99ef4

Replace vp9_kf_default_bmode_counts structure with
direct default probabilities. The probability structure is
smaller and it removes the need to specify in the bitstream
how to convert the counts to probabilities.

Note that I have concerns still about the size and value of
the large intra mode context. This may cause problems for
HW but it also means we rely heavily on reverse update as
forwards update of a structure this size is problematic. I
intend to review this more generally in the next few days to
see if we can come up with a competitive solution that does
not rely on such a large context.

Change-Id: I0a36071079d5d26a57ab0e9fbf91af4199aa7984

Change-Id: I6c70a8a8a4633399842ac74792003ae5f7859ffa

Replace mi_width/height_log2 with b_width/height_log2 in partition
type parsing at bit-stream writing stage. This allows parsing
resolution at 4x4 block level and makes the 4x4/4x8/8x4 partition
coding consistent with other superblock types.

Change-Id: I7db3617ea042e0db2dc898999b0c323bff91a22f

This patch creates a new inter mode contest that avoids
a dependence on the reconstructed motion vectors from
neighboring blocks. This was a change requested by
a hardware vendor to improve decode performance.

As part of this change I have also made some modifications
to stats output code (under a flag) to allow accumulation of
inter mode context flags over multiple clips

Some further changes will be required to accommodate the
deprecation of the split mv mode over the next few days.

Performance as stands is around -0.25% on derf and
std-hd but up on the YT and YT-HD sets. With further tuning
or some adjustment to the context criteria it should be
possible to make this change broadly neutral.

Change-Id: Ia15cb4470969b9e87332a59c546ae0bd40676f6c

Change-Id: If6aee510cbc4910f2f24fcd92dddc65fdf8edeea

Combining encode_nmv_component with encode_nmv_component_fp
and read_nmv_component with read_nmv_component_fp. Bitstream is slightly
changed (only the order of bits), here are the results on test sets:
stdhd: +0.047, yt: -0.038, derf: +0.001, hd: -0.011.

Change-Id: I1be312e976796df78ca63368702d0ee19f2b8c50

This commit allows the rate-distortion optimization recursion
at encoder to go down to 4x4 block size. It deprecates the use
of I4X4_PRED and SPLITMV syntax elements from bit-stream
writing/reading. Will remove the unused probability models in
the next patch.

The partition type search and bit-stream are now capable of
supporting the rectangular partition of 8x8 block, i.e., 8x4
and 4x8. Need to revise the rate-distortion parts to get these
two partition tested in the rd loop.

Change-Id: I0dfe3b90a1507ad6138db10cc58e6e237a06a9d6

Change-Id: Ib7448f7f325ba34a3cba8ab3129028e31e593cf5

Move set_partition_seg_context_ to common file. Use consistent
context setup conditions for partition probability model update at
encoder and decoder.

Change-Id: I24b7ed3b1c48e3d2568191a46b70136b99b67b1a

Use common function to fetch/assign sb_index in rd loop, bit-stream
writing and reading.

Change-Id: I1d8a214a57ed9cbcd026040436ef33e5e39d65b7

Make framebuffer allocations according to the chroma subsamping
factors in use. A bit is placed in the raw part of the frame header for
each of the two subsampling factors. This will be moved in a future
commit to make them part of the TBD feature set bits, probably only set
on keyframes, etc.

Change-Id: I59ed38d3a3c0d4af3c7c277617de28d04a001853

We don't have two loopfilter types anymore.

Change-Id: I53c0137361342c7d00887ad03be3490f0dfa3532

Update and buffer left/above partition information context per 8x8
block. This allows to further enable recursive partition down to
4x4 block size, and hence deprecating I4X4_PRED and SPLITMV.

This commit also fixes a context buffer swap/restore issue in 32x32
partition type search. This gives 0.1% performance gain for derf/yt.
Will refactor the superblock partition type search into recursion
form.

Change-Id: Ib61975aca5f12b78d8018481d7fa1393d085689b

Delete code under the CONFIG_CODE_ZEROGROUP flag.

Change-Id: I5fe6c7b42a5da9b73118e33594301da4129f320a

Delete code under the CONFIG_COMP_INTERINTRA_PRED
flag.

Change-Id: I3d1079cf46305c08f7e11d738596ea112e7b547f

Clean out code relating to newbintramode.

Change-Id: Ie91f4f156cdf60ce0da8ca407c1c9cb00c7d0705

Pull sb8x8 out of experimental list. verified via borg run tests.
Fixed unit test failures.

Change-Id: I12a4bbd17395930580c048ab68becad1ffe46e76

Resolved the unit test failure on tile independence when sb8x8
enabled.

Change-Id: I23ca86c88170e49ca160e8e897d913905e6080ce

Change-Id: I9cd21c5c9107d6197caab6949700b29c51658af3

The number of reference buffers is extended to 8 and
a reference sign-bias added for the LAST_FRAME.

Whilst the number of reference buffers used by an
individual frame remains unchanged at 3, these may
now be selected from 8 possible buffers.

Change-Id: I2d247b9c1c2b3a339d6c9fac125e81ba373f75a7

Update mode_info of 8x8 blocks within the scope of current block.

Change-Id: I110c599e60664a5acde6afd919b107cea8419a0d

Moving code from huge vp9_pack_bitstream to encode_loopfilter function.

Change-Id: Idceb836da5b346cd54fc33402283e7cfb6d9097d

This fixes some problems in splitmv-related bitstream parsing in the
sb8x8 experiment.

Change-Id: Id168f9ec9c88626877d8f536e6f394b6f4f782e4

Don't allow i4x4 except for sb8x8 recursion step. Read only 4 (not 16)
i4x4 submodes if we are i4x4.

Change-Id: Iaaaced1a134006b2c96eed66f014300eae41e0ed

This commit enables bit-stream writing and reading for recursive
partition down to block 8x8.

Change-Id: I163cd48d191cc94ead49cbb7fc91374f6bf204e2

Work-in-progress, not yet ready for review. TODO items:
- bitstream writing (encoder) and reading (decoder)
- decoder reconstruction

Change-Id: I5afb7284e7e0480847b47cd0097cb469433c9081

Changing the order of probabilities inside mb_segment_tree_probs in order
to use treed_read/treed_write function instead of custom code.

Change-Id: I843487d5057913b9358db73da270893eefecc6c8

Moving code from vp9_pack_bitstream to new function encode_segmentation.

Change-Id: I1f1e59a1f038618ad95162b7db4b6f8164850ea8

Enable forward model update for partition syntax coding.

Change-Id: If47b423b6d12f34614c57f25d235dc9ba688efc5

Change-Id: I0c57b90055a018d53c32b5e39d8e899a9a4d1c1b

Change-Id: I5429c02246d198eb1b6aadbc3313b26bf3436062

Change-Id: I087e08e7909a406b71715b8525c104208daa6889