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Avoid the qp-clamping on gf/alt frame if gf_cbr_boost_pct is set.

Change only affect CBR mode when  gf_cbr_boost_pct is set.

Change-Id: I0655ed4f2b047c8ed1ed33a070c17960ad776704

This was much more amenable to optimization than the across filter.
Speedup of almost 2.5x

BUG=webm:1320

Change-Id: I49acc0f9cb2e7642303df90132cbc938acade4c4

Change-Id: Idf4003ea6f9a2a42a9f26e156bee73697acb7a37

Change-Id: If9da7099f226a27a09cc9e2899eb66a1158909d2

Change-Id: I9be3d3d040837f658c6314606e28db8c31092a1a

Change-Id: If011dd923bbe976589735d5aa1c3167dda1a3b61

Change-Id: I06730eec80ca81e0b7436d26232465b79f447e89

Change-Id: I6be8c59ee220af0597bc2d7213f2779ac2e88db9

The speedup is pretty poor. I would be concerned except the SSE2 is
worse:
Existing SSE2 improvement: 22%
New neon improvement: 35%

BUG=webm:1320

Change-Id: Ied598a261134aa6cbe69f96f58589d2bae17bf62

Increase the boost threshold below which GOLDEN update will use same
rate correction factor as INTER_NORMAL.

Improves performance when gf_cbr_boost_pct is set (between 0 and 100)
in CBR mode.

Change-Id: I9f54cc18664786a100b13a416b7137ae03bd0cab

Add the gf boost and frame_parallel controls.
Set as default to off.

Change-Id: Id85fcb16a4fae97f51c09e9ebadb5cdcd510c2f5

Set short_circuit_low_temp_var to 3 for speed 8 for all res.
No strong visual difference on all clips.

Change-Id: Ia6d9a314291ab1c14d5421bbdd769974083aeb2a

Constraints on encoder config:
-target_bandwidth is no larger than 80% of level bitrate limit
-target_bandwidth * (1 + max_over_shoot_pct) is no larger than
88% of level bitrate limit
-min_gf_interval is no smaller than level limit
-tile_columns is no larger than level limit

Constraints on rate control:
-current frame size plus previous three frames' size is no larger
than the CPB level limit
-current frame size is no larger than 50%/40%/20% of the CPB
level limit if it's a key/alt-ref/other frame.

Change-Id: I84d1a2d6d6e3c82bfd533b3309ce999cfaba2c8b

The source sad could be used to copy the partition without going into
choose_partitioning function to speed up vp9 encoding. Computing source
sad takes little time. Speed test on Android and Linux shows little
encoding time gain (less than 1.4%).

Turned off for now since partition copy is turned off.

Change-Id: I61c9d5b8f22329760cb29a4ee30a7f9c232ce8d3

vp9: Set short circuit to level 3 for VGA for speed 8. Also change the
threshold_32x32 to 5/8*thresholds[1] to improve quality regression
caused to VGA clips.

Change-Id: Ia1590e91e7cb22be78d5b85013387bb1be4272e3

Also adjust some thresholds for noise level setting.

Change-Id: I7e03d7057ef2061c9447728deb9c6aff5d3da4b7

Comment out check on buffer underrun, as it currently fails
on some of the svc tests.

Also cast the update of bits_in_buffer_model_, as this can
go negative now due to the buffer underrun.
This fixes the issue in #1352.

BUG=webm:1350
BUG=webm:1352

Change-Id: Ibd4ef23921daf09e5c15b000aca904aa4573599c

Clamped the initial mv in vp9_refining_search_8p_c.

BUG=webm:1354

Change-Id: I47d302b350937e3e6e52e95c983b5fb0b4c64fba

BUG=webm:1301

Change-Id: Iffc83854218460b3f687f3774e71d45b552382a5

BUG=webm:1301

Change-Id: I56e3bc3aab9214e2debac93796389a7194991084