This should be similar to what x264 does with --aq-mode 1.
It works well with clips like parkjoy and touhou
(http://x264.nl/developers/Dark_Shikari/LosslessTouhou.mkv).
At low bitrates, the segmentation signaling overhead may negate the
benefits of this feature.

(PGW) Default changed to feature OFF to allow provisional merge.
Change-Id: I938abf9bb487e1d4ad3b0264ea03d9826275c70b

Updated the encoder to handle frames that are coded
intra-only. Intra-only frames must be non-showable,
that is, the "show frame" flag must be set to 0 in
the frame header.

Tested by forcing the ARF frames to be coded intra-
only.

Note: The rate control code will need to be modified
to account for intra-only frames better than they
are currently handled.

Change-Id: I6a9dd5337deddcecc599d3a44a7431909ed21079

Remove the semicolon in the definition of vp9_zero macro. Make all
the use cases of vp9_zero of consistent format.

Change-Id: Ibaf9751e8595872b12766381a93d185a4d90df8f

Change-Id: I0a0f9c07e774450896abc9455728b97fd38ef00c

There's no good reason to use types like long or short in new code.

Change-Id: Ic6de6259d5a99b7af478e9c6ab74e65d81b022e2

Assertion happens for invalid input data, the commit replace the
assertion with returning error.

Change-Id: I1b73ae752d64882d984cd23936efe75a757c2b41

Change-Id: I698e8df9b336d38bffe01e656acba00d4003695f

The commit added check to make sure no invalid memory access even when
the decoder instance is never initialized.

Change-Id: I4da343d0b3c78c27777ac7f5ce7688562c69f0c5

For bad input data, the decoder may access the array out of bounds. The
commit added clamp to prevent such out of bound access

Change-Id: I0a1cfd9b8786ea7113a998053c76605c963b077a

Remove the unused variable vp9_64x64_zeros from vp9_encodeframe_.

Change-Id: I34bfdcab9a9105440ad05154c1e0516e70258785

Change-Id: Iac55891ac9e6f13718c9f822aa099b5ca491832a

Change-Id: I2d96940fae4c7a16661a43c2bf6907d8b1c1a127

Change-Id: Icbcf68b5b685a56f255ebc3859c9692accdadf9e

Use the zcoeff_blk buffer of PICK_MODE_CONTEXT to store the indexes
of all-zero-coeff block of the current best mode. Remove the temporary
buffer best_zcoeff_blk defined in the rate-distortion optimization
loop. This improves the speed performance by about 0.5% in all speed
settings.

Change-Id: Ie3e15988ddfa581eafa2e19a8228d3fe4a46095c

This commit moves token_cache buffer into macroblock struct, instead
of defining as a local variable in cost_coeffs. This avoids repeatedly
re-allocating memory space in the rate-distortion optimization loop.

The runtime at speed 0 reduces:
bus 2000kbps, 161692ms to 159951ms
football 600kbps, 229505ms to 225821ms

Change-Id: If7da6b0b6d8c5138a16271a33c4548fba33d8840

vp90-2-07-frame_parallel.webm:
vpxenc stefan_sif.y4m \
  --codec=vp9 -p 2 \
  --frame-parallel=1 \
  --limit=10 \
  --auto-alt-ref=1 \
  --lag-in-frames=5

Change-Id: I7381a69aaaec238b309169a51b34cb6bf29a9c50

"-no-prec-div" option helps codec performance, so it was added back.
"-no-intel-extensions" was added to suppress link warning #10237.
option '-use-asm' is deprecated and removed.

Tested icc 32bit build and 64bit build.

Change-Id: I736ec2619857efd425ef76338dc52f8fbc0bcc7e

Also renaming dest_stride to stride in some places.

Change-Id: I75f602b623a5a7071d4922b747c45fa0b7d7a940

Using TREE_SIZE for the following trees:
  vp9_intra_mode_tree
  vp9_inter_mode_tree
  vp9_partition_tree
  vp9_switchable_interp_tree
  vp9_mv_joint_tree
  vp9_mv_class_tree
  vp9_mv_class0_tree
  vp9_mv_fp_tree

Change-Id: I0212bb4c1ee6648249f68517e28a67a56591ee1b

Renames:
  vp9_iht_add       -> vp9_iht4x4_add
  vp9_iht_add_8x8   -> vp9_iht8x8_add
  vp9_iht_add_16x16 -> vp9_iht16x16_add

Change-Id: I8f1a2913e02d90d41f174f27e4ee2fad0dbd4a21