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Add stats for past ARF usage, and use it to disable
ARF usage based on some conditions.

Overall improvement on ytlive set, reduces the regression
on the problem clips for this feature.

Only affects when sf->use_altref_onepass is enabled
(currently off by default).

Change-Id: I66267f227ea132dc86acb730e9882f85bead2cdb

Scene detection is not currently used in SVC 1 pass code.
Speedup of ~0.4%.

Change-Id: I0ab769300919de710cd2da1402014fa3f22a1f86

This reverts commit 535b7b91.

This is actually used in CBR to reset the rate control if high source sad is detected.

Original change's description:
> Remove the speed condition on scene detection in 1 pass code.
> 
> Scene detection is used for VBR mode and for screen_content mode.
> 
> It was also enabled for CBR mode via the speed condition,
> but currently the analysis in the scene detection is not used
> in CRB mode (similar computations are done locally at superblock level
> when the source_sad feature is enabled).
> 
> For 1 pass code.
> No change in behavior. Small speed gain, ~0.5%.
> 
> Change-Id: I59991d7ef2af320bea7af4b907596e057affa42f

TBR=marpan@google.com,builds@webmproject.org,jianj@google.com

Change-Id: Ib4e6b02047f75632503e7b0fc870af97fa9291c3
No-Presubmit: true
No-Tree-Checks: true
No-Try: true

Exposed by fuzz test in high bitdepth.
The bug is introduced in commit 64653fa1.

BUG=webm:1466

Change-Id: Idd77d5c6a60efb9241471611ce1aba0646cb6ff5

C vs SSE2 speed gains:
_4x4 : ~1.95x

C vs SSSE3 speed gains:
_8x8 : ~3.30x
_16x16 : ~5.67x
_32x32 : ~3.87x

BUG=webm:1411

Change-Id: Ib483989b25614aa89b635e8c087d0879a5d71904

Scene detection is used for VBR mode and for screen_content mode.

It was also enabled for CBR mode via the speed condition,
but currently the analysis in the scene detection is not used
in CRB mode (similar computations are done locally at superblock level
when the source_sad feature is enabled).

For 1 pass code.
No change in behavior. Small speed gain, ~0.5%.

Change-Id: I59991d7ef2af320bea7af4b907596e057affa42f

'iter' parameter is being checked for NULL in every call to
decoder_get_frame which is quite pointless because it is always
going to be NULL unless the application changed it. The code works
as described only because vp9_get_raw_frame returns -1 on all
subsequent calls after the first.

Change-Id: Ic736b9e8fe36fc1430fc11d6a9b292be02497248

BUG=b/64710201

Change-Id: Ia518af5494a42e80949cf1165244fbed59606cf7

The speed condition is not needed, feature can used for any
speed in 1 pass code.

Change-Id: I878ef3f63a075302eda48c0343fa243c80aab9ba

To be used for 1 pass VBR.
Off by default in speed features.

Change-Id: I5d6110d6d191990db526fe68ec9715379a4d1754

BUG=webm:1419

Change-Id: I39c8033734562efc0ac0e28e7f06fa05130f9b96

* changes:
  cosmetics: NEON scaling code
  Refactor convolve NEON code
  Refactor convolve code

1. vp8_copy_mem16x16_mmi
2. vp8_copy_mem8x8_mmi
3. vp8_copy_mem8x4_mmi

Change-Id: I3de29a11fa7402df0e48bbb944440b1e66498a65

Set it as default to 900.

Change-Id: Id2d990925dccff1f6762411c66ea95973440c92f

C vs SSSE3 speed gains:
_4x4 : ~2.45x
_8x8 : ~10.61x
_16x16 : ~11.34x
_32x32 : ~6.36x

BUG=webm:1411

Change-Id: Ic91389a4f1a8ad093f498afe53765b897fb9be09

* changes:
  Remove the unnecessary cast of (int16_t)cospi_{1...31}_64
  Remove the unnecessary upcasts of (int)cospi_{1...31}_64
  Change cospi_{1...31}_64 from tran_high_t to tran_coef_t

Add the condition frames_since_golden > 0 to the
early exit check for ARF usage in nonrd_pickmode.
This improves quality of first frame following ARF, where
frame_since_golden = 0.

Small/neutral gain in metrics for speed 6, neutral change in speed.

Only affects when USE_ALTREF_FOR_ONE_PASS is enabled.

Change-Id: I82e73e6ff6fc849e5ca5448563cb8a0515fe0cdc

BUG=webm:1450

Change-Id: If59743aafe99226e0ec67ab5d20678ce25f53ab8

BUG=webm:1450

Change-Id: Ib046fe28caec5b9ebdc9d0152df7c54ff4266858

The unnecessary upcast to (int) will be cleaned later.

BUG=webm:1450

Change-Id: Ia234575206d5a74540526924b06ed3939322d063

A new bug was introduced in a80bdfd0 "Change sinpi_{1,2,3,4}_9 from
tran_high_t to int16_t". Reverted the change in this file.

BUG=webm:1450

Failed test C/TransHT.AccuracyCheck/26.

Change-Id: Id001f57aad811803ef7d367d2b2bc008d8499991

quiets nasm warning:
label alone on a line without a colon might be in error

BUG=webm:1462

Change-Id: I660407ca60e8c9a810dba9d76afb65852029a29c

Change-Id: Ib91054622c1f09c4ca523bc6837d7d8ab9f03618

Rename a couple of hbd static functions.
Move the position of NEON function convolve8_4().

Change-Id: Idfac00edf2e99cdd8e0a73b9f895402f60be6349

Extract a couple of static functions into their caller functions.

Change-Id: If8d8a0e217fba6b402d2a79ede13b5b444ff08a0