Substantial reworking of the speed vs quality trade offs for
speed 1 and 2.

In this patch I am attempting to freeze the "quality" meaning of
speeds 1 and 2 relative to speed 0 so that in future we can
better evaluate progress.

I am targeting :
Speed 1 quality ~-5% vs speed 0.
Speed 2 quality ~-10% vs speed 0

It is inevitable that quality will still fluctuate a little as we adjust
settings and add new features, but we will attempt to keep as
close as possible to these values. Above speed 2 things will remain
a bit more fluid for now.

In this patch speed 1 is approximately 4-5x as fast as speed 0. This
is similar to before but the quality hit is a lot less. Likewise speed 2
is approximately 2x as fast as speed 1 but is similar in quality to the
previous speed 1 configuration.

Also slight change to behavior of FLAG_EARLY_TERMINATE to insure
all reference frames get at least one rd test. Important for very low
variance regions.

WIP :- Added a new speed level with old speed 4 becoming speed 5.
Speed 3 and 4 tradeoffs still WIP

Change-Id: Ic7a38dd7b5b63ab1501f9352411972f480ac6264

This commit causes use last partition to consider whether a 64x64 has
motion that might make a new partitioning worth while.

Change-Id: I3a57bedef4f3cd961fadbfa96651c206fa36da4a

Adding appropriate test vector vp90-2-06-bilinear.webm.

Change-Id: Ia3bbf57318e0cc61a1b724fe751e3f9c7e11b337

Change-Id: I401536778e3c68ba2b3ae3955c689d005e1f1d59

Making appropriate memset inside decode_block now.

Change-Id: I8e944194668c830de08271c8fb6e413251c201d8

Remove mode_check_freq and mode_test_hit_counts from VP9_COMP.

Change-Id: Iabfd9f841444cd9bf19ac761a9795f140082ce0b

The codec should effectively run with motion vector of range (-2048, 2047)
in full pixels, for sequences of 1080p and below. Add assertions to clarify
this behavior.

Change-Id: Ia0cac28249f587d8f8882205228fa480263ab313

Change-Id: I4b1c6bb9ff615f5872b96ed07dbf0f5e18e63643

Change-Id: I92fd32476c472e54f52b8d7602a98262b25e6eaf

Change-Id: Ib19dabe697656e4d7e8403d91bedca7cd31d36bf

Change-Id: Icc6a76a5be77f3e19918155bab3998e0aa32ccf5

Change-Id: I6c4058aebe834e1a12b7a3fb10484b9ebe60b349

Change-Id: I84209d382ca5dfc537ee533cd792d8caa0e25cee

Interleaved the instructions, reduced register dependency, and
prefetched the source data. This improved the decoder speed
by 0.6% - 2%.

Change-Id: I568067aa0c629b2e58219326899c82aedf7eccca

Also renaming mb_row -> mi_row, mb_col -> mi_col arguments and calculate
mb_rows/mb_cols values from mi_rows/mi_cols.

Change-Id: I6919a279f560648e23bc9a12f507d17c21ffd5d7

near is a key word, changed to use nearmv instead.

Change-Id: Ib54438c431b2b2521a62fc7b61a9c127dd7bc01e

Change-Id: I6973e7121b6393379b5759f288632e8eab763d3e

Function list:
  tx_counts_to_branch_counts_32x32
  tx_counts_to_branch_counts_8x8
  tx_counts_to_branch_counts_8x8
  update_ct
  update_ct2
  update_mode_probs

Change-Id: I120d8945a34378cf285d6bd415e23de1d522cf2f

Make encoder skip rectangular partition check in speed 1 and above,
when early termination was triggered in partition split.
Thanks Guillaume (gmartres@) for catching this issue.

This change makes bus_cif at 2000kbps speed 1 runtime goes down from
25612ms to 23438ms (about 9% speed-up), at the expense of -0.235%
performance down.

Change-Id: I98613fad081a261d30d5fa206f934ca70601c180

Change-Id: I7380a089105f658257bbb3e30a525da168e76952

We don't need these functions anymore. The only one which was actually
used is vp9_add_constant_residual_32x32. Addition of
vp9_short_idct32x32_1_add eliminates this single usage. SSE2 optimized
version of vp9_short_idct32x32_1_add will be added in the next patch set,
right now it is only C implementation. Now we have all idct functions
implemented in a consistent manner.

Change-Id: I63df79a13cf62aa2c9360a7a26933c100f9ebda3

The code now takes into account temporal and spatial
information to determine the partition size range, but the
frequency counts have been removed.

The net effect is similar in quality but about 10% faster.

Change-Id: I39a513fb79cec9177b73b2a7218f0da70963ae95

This patch deletes the variance based speed three partitioning.
Speed 3 now uses the same partitioning method as speed 2
but with some stricter conditions.

The speed and quality are now somewhere between speeds 2 and 4
whereas before it was worse in both than speed 4.

Change-Id: Ia142e7007299d79db3ceee6ca8670540db6f7a41

Change-Id: I4e163cc4ce9ec2f3a5a8b9da478049c71b08d71f

Change-Id: I8b496191c6a60a60a52c929adca305db47058a84

Change-Id: I97bf241c0d981721cc74a50be47c9db8a00f6be3

Change-Id: I442609f689aa9381e1e208012305cf62a6b31eee

Change-Id: I07fbb32d5cee0003d04b2369cfafcb03c371cd4f

Change-Id: If6a7a8c48fefc69349c792d8ed52a6e1d374e46e

Change-Id: I58209ae96d21c56cbb8ef796940b6ca3b3ebfa72

Change-Id: I1fd79093a5b9cb40c9e877b6b71c25a07a69b3ae

Change-Id: Idfa17d120ec4edf542e424fa0deb769951afbf4a

Change-Id: I13aa43df6bff340b5768d69125b473a52d1d59bd

Change-Id: I3556738d27def6a5bd71577728050a1e2bb1de63

Change-Id: Ia41e1966431652b839134a1c27feccb25c762539

Change-Id: Ia7969baac7ffc6d7a0e8e8e83e9252d077a3c5b3

Change-Id: Ic5807152cc78127b3f84b5abb4c5f3ef6d06ce65

Change-Id: If61380115163a02ecfe74b82e116001ac54e20e2

Change-Id: I2b2af1dd9f5c29c05e28a4fd51fa58ccc4071477

Change-Id: Id2cc5c829399a2afdf7a8a82615a4e272c814986