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Properly restore the rate cost in the inner search loop of obmc
prediction. This avoids unexpected encoding behavior. It fixes
the unit test failure in obmc experiment:

AltRefForcedKeyTestLarge.Frame1IsKey/2

Change-Id: I667b219dfcf2f2c63d9d984900ed3cfd10c354bd

This patch removed the experiment of BIDIR_PRED and merged the feature
into the experiment of EXT_REFS:

(1) Each frame now has up to 6 reference frames, namely
    LAST_FRAME, LAST2_FRAME, LAST3_FRAME, GOLDEN_FRAME, (forward) and
    BWDREF_FRAME, ALTREF_FRAME (backward);
    LAST4_FRAME has been removed;
(2) First pass still keeps the 8 updates:
    KF_UPDATE, LF_UPDATE, GF_UPDATE, ARF_UPDATE, OVERLAY_UPDATE, and
    BRF_UPDATE, LAST_BIPRED_UPDATE, BI_PRED_UPDATE;
(3) show_existing_frame==1 is supported in the experiment of EXT_REFS;
(4) New encoding modes are added for both single-ref and compound cases,
    through the use of the 2 extra forward references (LAST2 & LAST3)
    and the 1 extra backward reference (BWDREF).

RD performance wise, using Overall PSNR: Avg/BDRate
        Bipred only      Prev EXT_REFS    Current EXT_REFS with bipred
lowres: -3.474/-3.324    -1.748/-1.586    -4.613/-4.387
derflr: -2.097/-1.353    -1.439/-1.215    -3.120/-2.252
midres: -2.129/-1.901    -1.345/-1.185    -2.898/-2.636

If in vp10/encoder/firstpass.h, change BFG_INTERVAL from 2 to 3, i.e. to
use 2 bi-predictive frames than 1, a further improvement may be
obtained:
                 Current EXT_REFS with bipred
        1 bi-predictive frame    2 bi-predictive frames
lowres: -4.613/-4.387            -4.675/-4.465
derflr: -3.120/-2.252            -3.333/-2.516
midres: -2.898/-2.636            -3.406/-3.095

Change-Id: Ib06fe9ea0a5cfd7418a1d79b978ee9d80bf191cb

Change-Id: I030fdde966b9911712eca131d095015afd9b0d8a

Inter blocks that have SEG_LVL_SKIP active must be at least 8x8 in
size for bitstream conformance (see read_inter_block_mode_info in
decodemv.c).

This patch makes the variance based partitioning scheme stop at 8x8
blocks in inter frames. This satisfies the SEG_LVL_SKIP constraint
and is more in line with the original implementation of this function
(before it got extended for 128x128 superblocks).

BUG=webm:1234

Change-Id: I1fdd894569a9c0817713a77daabe4c8b8e1d00c0

Reduce the cache footprint of the token_costs table.

Change-Id: Ie989e60c6479ac3251cadaac9c7e795ccba52f4e

Change-Id: I9661f2fe9d315dccae69caa70d929b5d9d93b7db

The trellis optimization is going backward. Hence there is no need
to restore the token_cache values that is behind the current node
in the scan order.

Change-Id: I4da8a2e3f78bf9630e6667c85d8c387c5d94de9a

Localize table access. This provides another 10% speed-up to
the unit.

Change-Id: Ib902121f412f78e2bd501b9799c8c64462f803b5

The test in arf_freq assumes any no-show frame as ALTREF_FRAME and
then calculate the minimum run between two consecutive ALTREF_FRAME's
based on this assumption. As BWDREF_FRAME is also a no-show frame and
the minimum run between two consecutive BWDREF_FRAME's may vary
between 1 and any arbitrary positive number as long as it does not
exceed the golden frame group interval, this test does not apply to
the experiment of BIDIR_PRED.

Change-Id: I70efb2c691fdc18601dbb8a7735ac2f27817e75a

Change-Id: Id918d502c8f89e236bcb51949d7ad34efa017321

Move the supertx skip bit and transform type past the recursive
prediction blocks. This is in preparation for using the segment level
skip feature for supertx blocks.

Change-Id: I8319414b0734144a9264e8a4a60940b6716b12a8

Also shortens the test and changes some of the parameters.

Change-Id: Ieda4aeffa55550fbb9e4235f735c383ef6baf32c

The speed features can change per frame, so remove condition on
releasing the variance tree.

Change-Id: I651c87a1504266d737e6d98f14fd3ed30d84e01d

The old version used 64 bit loads, and then ignored the top half
of the result. This can cause asan failures if we read past the end
of a buffer. Switched to using 32 bit loads instead.

Change-Id: I57da127a26f869fb4b4f700b55408f6dc2fbbc1a

Change-Id: Idf84475fe06666d5c73c9d86dfc5c23bef170086

Change-Id: Ib74a494e1cf50a356f51e8185e19ca66fcb896a2

this is shared between vp9/10

BUG=webm:1235

Change-Id: I2f44b15268a33453a1c1e0c691d4fc1fc12d0263

this file is shared between vp9 & vp10; this makes it available in the
presence of --disable-vp9

BUG=webm:1235

Change-Id: Iaf060c3c09afd2c7df69995b0c01589f78d4945e

Change-Id: I2ef8e479893403581711abc020509c6863c2035d

Sarah Parker authored Jun 09, 2016 and James Zern committed Jun 15, 2016

The current test case is only run for vp9 and vp10 when HBD
is enabled. This was mistakenly removed in:

d53f9a39 Enable VP10 HBD PSNR checking unit test

Change-Id: I88b8168ad1efd805d759238a037653a2901bf50d