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objective-1-fast results:

sequence       PSNR    PSNR HVS    SSIM    CIEDE   APSNR   MS SSIM VMAF
average        -0.02    0.01       -0.02   -0.03   -0.02    0.00    0.06
1080p           0.02    0.01        0.03    0.00    0.01    0.02    0.09
1080p-screen   -0.32   -0.28       -0.32   -0.44   -0.31   -0.27    0.00
360p            0.06    0.14        0.10    0.10    0.08    0.11    0.22
720p            0.00    0.04       -0.05    0.01    0.00   -0.01   -0.10
wikipedia_420  -1.04   -0.95       -1.05   -1.30   -1.03   -0.88   -0.29

Change-Id: I30ce8a869daf1c3ed539ffed552786cbb785e7d0

Partial revert of "Remove encoder speed 8 in AV1"
6c29f464.

Change-Id: I474e26700047854353347ce97cc7d545e3ca0642

Change-Id: I9fdf3b543a00700d47b3012b3de7b30ae455900f

Adds sanity checks to methods that should only be called for intra
blocks.

Change-Id: I34b24dbb24f6d35ff42bbdf31d29eef2980a05b4

Use 2x2 inter prediction for chroma component. This improves the
compression performance by 0.6% for lowres.

Change-Id: If9d98e49cee63f40085b179652bfacc31ff462ea

This fixes a warning about unused computed values when
CONFIG_HIGHBITDEPTH is 1.

Change-Id: Ibf1076c4838f750da4a1b940b550ef8ecac6ba02

Adds three new helpers and changes one other. The intention of this is
to make the triggering and function of resizing simpler. The new process
is to resize to the next state and then update the current state to
match. The new helpers reflect this change and make the overall flow
simpler.

resize_pending is now a helper instead of a member, so it doesn't need
to be raised manually. A resize is pending when the numerator or
denominator of the next resize state is different from the current one.
resize_pending could be 1 (scale down), 0 (no change), or -1 (return to
original resolution if 1-pass CBR), but now it can only be 1 or 0. To
return to the original resolution just set the scale to 1:1. This
reduces complexity with no change in functionality.

resize_unscaled just returns 1 if the current numerator and denominator
are equal. This makes some if conditions cleaner.

resize_step makes the current scale equal to the next scale. This
signifies that a resize is complete and will cause resize_pending to be
false until the next state is changed. This is the end of the new
resizing procedure.

av1_calculate_coded_size has been changed to calculate the next size
instead of the current size. The current state can't be updated until
the resize is complete because if it were, the resize_pending state
would drop and the resize wouldn't finish. This just means the next
resolution is the target resolution until the resize is complete.

Change-Id: I5d5855cc83f532d3a8b1f8853ba70a0d43221fbf

BUG=aomedia:442

Change-Id: I98ada843016d0dd046f89bbcb2e9ae72442a101e

* Change ref parameter to use LAST FRAME instead of
 previous frame, which makes it consistent in
 enc/dec for tempmv_signaling.

BUG=aomedia:511

Change-Id: I02f1101623b7b3b09cd4d3f2977e9503b95818ec

CFL is disabled when skip_chroma_rd is enabled. This is done by reusing
the logic in CB4X4. To facilitate integration, the skip logic used in CfL is
moved inside the read/write functions.

Results on Subset1:
master@2017-05-08T19:54:48.196Z -> cfl_baseline@2017-05-08T20:06:55.292Z
  PSNR |  PSNR Cb |  PSNR Cr | PSNR HVS |   SSIM | MS SSIM | CIEDE 2000
0.2668 | -12.0951 | -10.4138 |   0.3095 | 0.2998 |  0.2831 |    -3.6579
https://arewecompressedyet.com/?job=master%402017-05-08T19%3A54%3A48.196Z&job=cfl_baseline%402017-05-08T20%3A06%3A55.292Z

Change-Id: I45644baa1aceef5ad4da3332fcb10f3fbaac052b

* Add tile dependency support when ext tile enabled.

Change-Id: I8fe40adf285e171b5b761b15590a8b1c6758b8f7

For multi-thread encoding, previously the encoder buffers are
allocated at every frame, but only freed at the end of encoding,
causing memory leaks.

Change-Id: Id0e9d7fba8330e82be9cec1d42b7d4b017b8d772

This experiment extends ALT_INTRA by adding two new modes:
smooth horizontal and smooth vertical.

Improvement on *intra frames* in BDRate (PSNR):
===============================================

AWCY (high latency): -0.46%
(Also, -1.0% or more on PSNR Cb,Cr and APSNR Cb,Cr).

AWCY (low latency): -0.43%
(Also, -0.88% to -0.94% on PSNR Cb,Cr and APSNR Cb,Cr).

Google sets:
lowres: -0.454
midres: -0.484
hdres:  -0.525

Improvement on *video overall* in BDRate (PSNR):
================================================

AWCY (high latency): -0.15%

Google sets:
lowres: -0.085
midres: -0.079

Change-Id: I9f4e7c1b8ded1fe244c72838f336103ccc715d50

BUG=aomedia:518

Change-Id: Ia88b50b084c6370073ac4916e00a019963cf0254

When a block only contains 2 unique colors, there's no need to run
K-means, as 'lb' and 'ub' can directly be used as the centroids.

Two benefits:
1. Encoding will be faster for this special case, and
2. Can potentially avoid sub-optimal/duplicate centroids generation
(due to integer rounding) when 'ub' and 'lb' values are very close.

Change-Id: Ice04fc8577e3cc8c74f87d623a16ac8de3257cdd

Also includes a change in the wedge primary functions providing
a slight improvement.

Change-Id: I536d3209f59624e23128708e29fa85c1e6fcd97e

Since the size used with cfl_load can either be based on the transform
block size and the prediction block size, width and height are used as
parameters instead of TX_SIZE.

This resolves a problem where cfl_compute_alpha_ind was reading
uninitialized memory.

Change-Id: I187dbdd5b2e8bd85e82bb77eb74859bee2cd3f1e

This will improve the lowres performance by 0.1%
No significant change on midres and hdres

Change-Id: I0c6e69bf48596e7e5ad49631ed9f9be73bbf3c9a

This reverts commit 9395b34e, because it
did not have any effect in eliminate ubsan warnings as intended.

Change-Id: I9221385217f062a0356fe0c68643b12751048f69

Even though number of unique colors in a block may be at least
PALETTE_MIN_SIZE, sometimes the K-means can generate fewer than
PALETTE_MIN_SIZE unique centroids due to integer rounding.

This was resulting in "k - PALETTE_MIN_SIZE" being negative and using
that as an index into palette_y_size_cost array was causing a UBSan
error.

BUG=aomedia:515

Change-Id: Ia00b4bb2efebbe43d1fec7b619ebb837b1ae961c

Change-Id: I64c523a34b4d69450759433e125a79e63d928037

Measure SSE for all possible alphas.
Estimate rates for alpha signalling.

Change-Id: Idf1e3c632925cd306090fc38cf5b95eff7ee5c1c
Signed-off-by: David Michael Barr <b@rr-dav.id.au>

BUG=aomedia:514

Change-Id: I97e20524b091169635395098efe234a7fd846bd9

Adds a speed feature to control which references to use
to compute global motion.
Also adds logic to not compute duplicate sets of
parameters when reference frames point to the same
buffers.
Includes some renaming of functions to set good speed
features to make things clearer.

Change-Id: I641d33441fde98af18cad8d4db49cf7d5d153ead

fixes a couple of type conversion warnings for msvc2015

Change-Id: I004f072661c981e204bd62b2740201658ad67294

The conversion of return value to int64_t appears to be unnecessary.

fixes a number of type conversion warnings for MSVC2015

Change-Id: Ibca24468e73bf22ad07c469ce5d1223635390ecb

Removed "const" from parameters that are passed by value, also fixes
msvc2015 compiler warnings.

Change-Id: I0c7555b4245fa55fabda1c27762fb9f0860bfa18

Change-Id: Ib92f54480035a85ab7279ffa9f8b9237d0a3f334

Use a simpler least-squares function for affine and rotzoom
model estimation, instead of computing the pseudo inverse.
Also refactors the code into a separate mathutils.h file.

The SVD code is currently used only for estimation of the
homography models which can be removed when we remove the
homography models.

Coding efficiency change is in noise range, with the small
difference coming from numerical precision issues.

Change-Id: I0a9eb79495911cea21a7945b397d596e22a2a186

The angle estimation in ext-intra didn't account for
alt-intra.

Also use c99 variable declaration style.

BUG=aomedia:444

Change-Id: I001b0278eb8cf560975c873a423de024c10d08b4

Writes and reads alpha to and from the bitstream.

A special case is needed on the encoder side to handle prediction block
skips. Since whether or not a prediction block is skipped during CfL, a
rollback is required if the block was skipped and the alpha index was
not zero. The advantage of this is that no signaling is required when
the prediction block is skipped as it is assumed tha the alpha index is
zero.

A encode facade is added to the intra prediction facade as CfL requires
special encoder side operations.

Change-Id: Ic3b11d0fdbd51389d862112eb09d8785127a6b06

Change-Id: I705bbb79104eda4a7db8146e49795dbe80a31a3f

Used CHECK_MEM_ERROR in cpi->mbmi_ext_base memory allocation.

Change-Id: Ief8629d2b420b073f233c7c8e5e0b6d4269aea5c

Change-Id: I96e386678f6227f3ca735c9be2725cb9795b3296

Remove the unused codes under the experimental flag.

Change-Id: I4e1c176d13a58f6677f32d52bbfaa7f0aad4249d

This will guarantee that av1_optimize_b will be turned off when
lossless mode is on

Remove heuristic lossless check in optimize_b_greedy

Change-Id: I636c776f3f6b632eb03bc57a470ea43aae4fe0f6

Prep work for changing how frame contexts are signaled.

Change-Id: I0db8ec631fc2d616d16fabaf72eac5663ffe3630

BUG=aomedia:500

Change-Id: I8fc3b76925543da6928bf9c20c314dfe5f349317

Change-Id: Ib1450eb524e5ca48f2bc3c2d48af19760a0d60a3

This patch removes resize triggering by rate control and also removes
pending resizes causing recodes in encode_with_recode_loop. The removed
functionality will be replaced in the future, but it is simply being
removed for now to simplify the work to do.

Change-Id: Ia4a5840dcb463faab5aab1c08f640a7bcf5e6c5a