Use lookup table to replace the arithmetic computation for transform
block step.

Change-Id: I1318d81bda9d7ffaf9d550acd19354b0615ede36

Allow the decoder to memset partial dequantized coefficient line
to zero.

Change-Id: I1f07dc7bf802958754502c1b5c819cc81e7a08cb

This CL will facilitate adapt_scan experiment.
In adapt_scan experiment, dynamic scan order will be stored in
AV1_COMMON

Change-Id: I4763ea931b5e1af54d4f173971befeb01a4db335

Use the table access to retrieve pixel numbers from tx_size.

Change-Id: I9459f2c3292c2f9ddf963f16b79e142de7432031

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

Change-Id: I9f6e9b075532faae0f74f885d9443589254258a7

Change-Id: I90ef3b49b499c2ac9c24797467cb4eb194fdf23b

This was a missed replacement from cherry-pick of:
9ac7a9dc

Change-Id: I9e01d9d7a39bed397500a293bf68dca2746aa917

BUG=webm:1277

Change-Id: I052239e8a6c468da8704bdbbb663b59533c01be2

Plus a small code clean up. The experiment of EXT_REFS, compared against
the baseline, using Overall PSNR, now obtains a gain on lowres as:
Avg: -5.818; BDRate: -5.653

Compared against the previous EXT_REFS results on lowres, a tiny gain is
obtained as:
Avg: -0.047, BDRate: -0.063

(1) 780952 Add encoder first pass support to bi-prediction in EXT_REFS
(2) f91498 Add pred prob handling for new references in EXT_REFS
(3) e91472 Add decoder support for bi-direct prediction in EXT_REFS
(4) 0dbac9 Add encoder support to new references in EXT_REFS
(5) ad70cc Remove hard-coded number for EXT_REFS
(6) 9c1e2f Add the use of new reference frames at encoder in EXT_REFS
(7) 6d4fde Add the experiment flag of EXT_REFS

Change-Id: I26f7ca45b9ede7579fdb9d0d6a1a91f4334599bd

Change-Id: Iccb75d5204f0f52f2c7d6e18d1f8223ce10f68ba

Example performance: 1.8% bit rate savings using
the AQ test mode aq-mode=4 :
./aomenc --codec=av1 --ivf --tile-columns=1 --tile-rows=1 \
                 --kf-max-dist=1000 --kf-min-dist=1000 --cpu-used=0 \
                 --passes=1 --threads=1 --lag-in-frames=0 \
                 --end-usage=q --limit=600 --cq-level=42 \
                 --aq-mode=4 --error-resilient=1 out.bits FourPeople_1280x720_60.y4m

Change-Id: Iba01cf2732a57f3c27481ac2a3c8fc37bb9e5533

Change-Id: I4128af44776d1f361bddc1fdffb75ed2224dbfa5

Change-Id: I2228a3d1778917ac760582fbec3c868be5d9ba1c

This commit changes to send frame size explicitly when
error_resilient_mode=1. Purpose is to allow parsing of bitstream
after a packet loss.

Change-Id: I7d1c010a465aa18914762cc1a3e61db377304c08

Change-Id: I1a462675c06c4b2a5f8b4b347f23fec67feccdd0

The (new) ans experiment replaces the bool coder with uABS bools. The
'rans' experiment adds multisymbol coding.

This matches the setup in aom/master.

Change-Id: Ida8372ccabf1e1e9afc45fe66362cda35a491222

This patch adds bit account infrastructure to the bit reader API.
When configured with --enable-accounting, every bit reader API
function records the number of bits necessary to decoding a symbol.
Accounting symbol entries are collected in global accounting data
structure, that can be used to understand exactly where bits are
spent (http://aomanalyzer.org). The data structure is cleared and
reused each frame to reduce memory usage. When configured without
--enable-accounting, bit accounting does not incur any runtime
overhead.

All aom_read_xxx functions now have an additional string parameter
that specifies the symbol name. By default, the ACCT_STR macro is
used (which expands to __func__). For more precise accounting,
these should be replaced with more descriptive names.

Change-Id: Ia2e1343cb842c9391b12b77272587dfbe307a56d

Change-Id: I371297e6ee000e6dc01ba1544763cbed429b0e5a

From code only part of nextgenv2 (and not aomedia)

Change-Id: I21f7478a59d525dff23747efe5238ded16b743d2

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

Cherry-picked from aomedia/master: 863b0499

Change-Id: Ida5de713156dc0126a27f90fdd36d29a398a3c88

- 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'.

Cherry-picked from aomedia/master: 30abc082

Change-Id: Ib9f0eefe28fa97d23d642b77d7dc8e5f8613177d

Move computing the segmentation_probs.tree_cdf table per symbol to
 computing it only when the probabilities are updated.

Change-Id: I3826418094bbaca4ded87de5ff04d4b27c85e35a

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

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

Change-Id: I6571126239f0327e22bb09ee8bad94114291683e

This flag was already added to aomedia/master, so bringing it back to
webm/nextgenv2, as part of an effort to get the two codebases in sync.

Change-Id: I2b933a6a160e4210d1411a9e7978149eb8553205

This reverts commit 9b25f306 to
reinstate the reverted commit with fixes that solved the build issues
when --enalbe-clpf is used in configure.

Change-Id: I15447cae7fa9b3deb27976345dc3db230a4a7a60

This reverts commit 97535038.

Change-Id: I9f8e891739352ca2bde4b294e37c85a668f416e0

These signals were in the uncompressed frame header (as a temporary
hack), which caused two problems:

* We don't want that header to be duplicated in the slice header
* It was necessary to signal the number of bits to transmit up front

However, the filter size can be 128x128 which is greater than the SB
size, and a decoder wouldn't be able to know whether to read a bit or
not until the final SB of that 128x128 block has been decoded
(depending on whether the 128x128 is all skip or not).  Therefore the
signalling was changed for 128x128 blocks so that every top left SB of
a 128x128 filter block contains a signal regardless of whether the
block is all skip or not.  Also, all the MB's of 128x128 block are
filtered even if they are skip MB's.  This gives the signal a purpose
even when the 128x128 block is all skip, and it also gives a slight
coding gain as it leaves a way to filter skip blocks, which was
previously forbidden.

Low latency:
PSNR YCbCr:     -0.19%     -0.14%     -0.06%
   PSNRHVS:     -0.15%
      SSIM:     -0.13%
    MSSSIM:     -0.15%
 CIEDE2000:     -0.19%

High latency:
PSNR YCbCr:     -0.03%     -0.01%     -0.09%
   PSNRHVS:      0.04%
      SSIM:      0.00%
    MSSSIM:      0.02%
 CIEDE2000:     -0.02%

Change-Id: I69ba7144d07d388b4f0968f6a53558f480979171

To get ready for pulling AV1 to nextgenv2
Replace the experimental flag by MOTION_VAR. Rename major variables.

Change-Id: If6cf4f37b9319c46d8f90df551cc7295d66ca205

Change-Id: Ic3a6855799be010e69aeab924b013679282ab191

BUG=webm:1311

Change-Id: I03c1043d17ed4e4ea22002473779a9612884c6c6

Change-Id: I31bea3b1f76493060edd7e1bd616a223841d5f77

Objective quality impact (low latency):

PSNR YCbCr:      0.13%     -1.37%     -1.79%
   PSNRHVS:      0.03%
      SSIM:      0.24%
    MSSSIM:      0.10%
 CIEDE2000:     -0.83%

Change-Id: I8ddf0def569286775f0f9d4d4005932766a7fc27

av1_clpf_frame() was always called with the same src and dst,
so we only need one argument and the code supporting different
src and dst was removed.

Change-Id: I70919f50e5cfb19c22eb4dff9ee7c0fa2697fad3

Instead of having CLPF write to an entire new frame and
copy the result back into the original frame, make the
filter able to work in-place by keeping a buffer of size
frame_width*filter_block_size and delay the write-back
by one filter_block_size row.

This reduces the cycles spent in the filter to ~75%.

Change-Id: I78ca74380c45492daa8935d08d766851edb5fbc1

Change-Id: I4a6d84007bc17b89cfd8d8f2440bf2968505bd6a

This commit ports a CLPF change from aom/master by manually
cherry-picking:
7560123c

Change-Id: I61eb08862a101df74a6b65ece459833401e81117

Change-Id: I134d276234b3b8aa7df1ab647892b5d739647f4c