Also port SIMD optimization of weighted sad/variance functions to
av1.
Coding gain improvement: 0.339/0.413/0.328 (lowres/midres/hdres)
Current coding gain: 2.437/2.428/2.294
Encoding time overhead: 17% (soccer_cif), 30% (ped_1080p25), was
12% and 18% without motion search

Change-Id: I101d6ce729f769853756edc8ced6f3a2b8d8f824

Change-Id: I84ff252eb813ce935ad6e17162f4f6fab701dcc7

For a 16x16 pixel block, one needs to allocate 16x16 coefficient
tokens, plus up to 16 eob tokens, per plane. This commit increases
the token allocation size to cover the case where all the transform
blocks are of size 4x4 in format 444.

Change-Id: I5755e6a53771053d51163d01ec1d62e670c5009e

No change in metrics

Change-Id: Ib1dbe41a9e1a564dd9a63a33e2a5315ad6bca70c

No change in metrics

Change-Id: I0da09270d78c3caf78a32a3157f02c87f2232e3e

aom_realloc was allocating 1 byte more than needed every time.
Fixed this, and took this opportunity to do a small refactoring.

Change-Id: I38fcb62b698894acbbab43466c1decd12f906789

Change-Id: I2da9cd5da48ae97e770bccfd1233bcc70b484688

Change-Id: I7c088c55f1c461063976d5bd84ff2026c4f3bc69

Move computing the partition_cdf tables per symbol to
 computing them only when the probabilities are updated.

Change-Id: I442f9230ba00be7f5d0558d7c38d7324ad009ee8

Move computing the inter_ext_tx_cdf tables per symbol to
 computing them only when the probabilities are updated.

Change-Id: I5e1e62f8eae8f6b2edbbd378beeb786649502c10

Move computing the intra_ext_tx_cdf tables per symbol to
 computing them only when the probabilities are updated.

Change-Id: I26d5e419e103093e98a7d896c196176305b50fc9

Change-Id: Iae2366380a8c24e4cde79b6a699b4073b4b7d488

Reduce its size from 270x2 to 90.

Change-Id: Ib6ea59344d7df4cefd2631aa73a1d5e599c212cc

This commit makes the encoder to use different frame context index
for different frame types. In the baseline setting, it sets the
frame context index of the overlay frame to be different from other
regular inter frames. In the ext-refs setting, it further allows
the backward reference frame to use a different index.

It improves the compression performance for both settings.

Baseline
lowres  0.1%
midres  0.15%

ext-refs
lowres  0.42%
midres  0.35%

Change-Id: Ie033fcc16af20dace9a70386dc35dad6c5744f09

SIMD optimization for 1d blending functions in obmc mode, and some
code refactoring and cleanup.

(ped_1080p25.y4m, 150 frame, 2000 tb)
Encoding time overhead: +18.8% -> +18.1%
Decoding time overhead: +21.3% -> +8.7%
Change-Id: I9d856c32136e7e0e6e24ab5520ef901d7b1ee9c8

While we are at it:
- Rename some variables to more meaningful names
- Reuse some common consts from a header instead of redefining them.

Change-Id: I110491c071ae6f68378030493679d49fe670129a

Change-Id: Ibf6985e7b140dc280a74f02084db428a2a85b990

By turning on ext_interp experiment
Encoder time is reduced for 26.7%
Decoder time is reduced for 15.4%

Change-Id: I14e197dd7ed3261339b0643fa4ed0947f74274fc

- Change struct name to all caps SCAN_ORDER to be locally consistent.
- Rename struct pointers to 'scan_order' instead of hard to read short
  names 'so' and 'sc'.

Change-Id: Ia131f14320c1a18aa12654cdb87bf8008878950a

Move from computing the switchable_interp_cdf per symbol to
 computing once per frame when the probabilities are adapted.

Change-Id: I6571126239f0327e22bb09ee8bad94114291683e

Move the av1_indices_from_tree() function from av1/encoder/treewriter.c
 to aom_dsp/prob.c so that it can be used by both the encoder and
 the decoder.

Change-Id: Ie43c599f425c3503b1ff93f0c77b5033a05b1bb4

Add av1_indices_from_tree() function that computes a forward and inverse
 mapping of the tree leaf-node symbols to their in-order traversal.
This is necessary because many of the aom_tree binary trees have their
 leaf nodes out of order (e.g., an in-order traversal of a tree with n
 nodes does not start at symbol 0 and go to symbol n - 1), but the CDFs
 created by tree_to_cdf() are indexed in-order.

Change-Id: Icd0dbed4c171a67c9e84a634106c4fdb5b1b3488

Change-Id: Ic04e180b09745fab2230d05985770c41deea4fad

Without first including ./aom_config.h in aom_dsp/prob.c the memmove
 function is implicitly defined and causes a compiler warning.

Change-Id: I339d0389f10324a1085aba7d6492b2159a14da92

For now this is in its own experiment for benchmarking purposes, but it
will eventually be folded into the main ANS experiment.

Change-Id: Icdb54b6ca3c0191ba717d6d10aaaffb11e2bebea

Change-Id: I96bd5d1fd4d9c3cf9f76fa8d2b0762a7cdc878fd

Change-Id: I371297e6ee000e6dc01ba1544763cbed429b0e5a

Change-Id: I97b4b2cb4c83f2be6a5be65fac6d0017dcf32c67

Remove the separate implementations of set_contexts() in encoder
and decoder.

Change-Id: I9f6e9b075532faae0f74f885d9443589254258a7

Upgrade profile if required.

Change-Id: Ieb2b77d2446290a8fc749739247a01e8f0600c55

Change-Id: I5feee1b56159e15c5eb55b7e4e50694207b2e19c

While we are at it:
- Rename some variables to more meaningful names
- Reuse some common consts from a header instead of redefining them.

Change-Id: I75c4248cb75aa54c52111686f139b096dc119328

Change-Id: I61eb08862a101df74a6b65ece459833401e81117

In the experiment of EXT_REFS, add the use of the 3 extra reference
frames, including the 2 forward reference frames LAST2 and LAST3, and
the one backward reference frame BWDREF, for the encoding.

For lowres, EXT_REFS achieves following bitrate saving on overall PSNR
compared against baseline:
Avg: -4.581  BDRate: -4.358

Change-Id: Ib15b65681c39892ddfce5e4107598c0a22317ccd

Change-Id: I42676bd99080b75e1a23b4378dcc3044d37d54c0

Display the -b --bit-depth command line parameter on of aomenc when
 --config-aom-highbitdepth is enabled.

Change-Id: I76147e38b9985e68b1e642e21be8fd4d8ec4d966

- Const correctness
- Refactoring
- Make variables local when possible
etc
- Remove -Wcast-qual to allow explicitly casting away const.

Change-Id: I6ecb7d345162dc08ccdd17095b0800fb3a00cf2f

In super_block_uvrd(),if is_cost_valid == 0, all return parameters,
i.e. rate, distortion, skippable, and sse, are reset.
So, should not call txfm_rd_in_plane() if is_cost_valid == 0.
Also, the bug causes av1_xform_quant() to see invalid diff signal
since av1_subtract_plane() is not called in super_block_uvrd().

Change-Id: Iaa06061e2e9aa8876b4611a54f4ae6b8d499332b

Change-Id: Ia149f7cc1d9a8a2289bdb65040992a9b4c234c73

Given the largest transform size is 32x32, this commmit changes size
estiiation based on the size rounding up to 32 multiples to avoid
insufficient buffer allocations.

BUG=https://bugs.chromium.org/p/aomedia/issues/detail?id=36

Change-Id: I6eab09dc6acdc0f5a6bcadb918d62c4852aae21f