Various cleanups and refactoring.
Removes feedback of active worst qaulity and uses last_q
instead to make the interface cleaner. Active worst quality
is now decided only once for a frame being coded in the
beginning based on last_q and other stats. Also, adds other
cleaups on last_q to store also the last_q for altref frames,
and reduces the altref interval a little.

The output does change a little.
derfraw300: +0.224% (global psnr)
stdhdraw250: +0.442% (global psnr)

Change-Id: Ie634cdc032697044c472dd0fe79c109b3e7f9767

Change-Id: Id677df4d3dbbed6fdf7319ca6464f19cf32c8176

Change-Id: I068345f722a7116e3119927295ad23a28d3066a0

Change-Id: I8b81a3e4b4fa530a654c28d9c136afa0c1d379fd

string literal to int within an assert

Change-Id: I0c889256b67a078e6e2a79577f0b7ae084243258

This commit enables an adaptive prediction filter type selection
for sub8x8 block sizes. In speed 1, it re-uses the filter type of
collocated 8x8 block if it is tested in the rate-distortion optimization
loop, for the sub8x8 blocks. Otherwise, it runs the normal test
over all the three filter types. In speed 2, it re-uses the 8x8
block's prediction filter type, if available. Otherwise, force it
to be EIGHTTAP.

Compression and speed performance wise:
speed 1
derf -0.266%
yt   -0.138%

bus at 2000 kbps: 33766ms -> 30451ms (10% speed-up)
football at 600 kbps: 48173ms -> 43786ms (9% speed-up)

speed 2
derf -0.026%
yt   +0.134%

bus at 2000 kbps: 18973ms -> 17698ms (6% speed-up)
football at 600 kbps: 26748ms -> 25096ms (6% speed-up)

Change-Id: I77e097533b969fd3472147225fa79fc98095d342

This function sets the motion search range limit. Rename it to be
more informative.

Change-Id: I2e8e01073dcb99c9bea9c9acd0a61d672d615444

This commit constrains the maximal motion search range for sub8x8
blocks to be [-1023, 1023], in the unit of full pixel.

Change-Id: I955b60649364ab410f2453cafd46a496f2fcb43e

Replacing if-else with switch statement, reordering function arguments.

Change-Id: I4825d2ef311ba8999b6d4ceb0eef003587a13434

Renames:
  vp9_get_pred_context_mbskip => vp9_get_skip_context
  vp9_get_pred_prob_mbskip    => vp9_get_skip_prob

Change-Id: I2af499848ef73f3f5cd8cdb27852d0bcdfe31d09

Change-Id: I83ffed2b1878a35ac35f07f9ee74309adc9c7b11

Adding get_uv_tx_size_impl() with tx size selection logic, rewriting
get_uv_tx_size().

Change-Id: I3ecb108059a41be227a8c89a0710bd174f508951

Change-Id: I0953a3b28758811f9d6a85787850e77592bd7670

Change-Id: I8ab9bbe2595ed1743f35223b6a6ce6d023b9a20e

Renames:
  vp9_get_pred_context_comp_inter_inter => vp9_get_reference_mode_context
  vp9_get_pred_prob_comp_inter_inter    => vp9_get_reference_mode_prob

Change-Id: I3bbb69481e6b0c848028667c9269f567f293d3bd

Change-Id: Ic3bb862e93aedf6a489a33ea6f7e5097d96855ee

Also adding BAND_COEFF_CONTEXTS macro to simplify for loop logic.

Change-Id: I12a78a49cf1addf81e6b3fe2a3736ec2b79bd79e

Renaming:
 vp9_get_pred_context_intra_inter => vp9_get_intra_inter_context
 vp9_get_pred_prob_intra_inter    => vp9_get_intra_inter_prob

Change-Id: I2c1affea2e84f4e616137c6df82adb11c7845781

Both single frame and compound inter motion search run with luma
component only. Hence removing the block size mapping therein.

Change-Id: I217488e702432ae9fa0e95bf6f516ebb36b5c79b

In the decoder we don't need to save eobs, we can pass eob as an argument.
That's why removing eob arrays from VP9Decompressor and TileWorkerData,
and moving eob pointer from macroblockd_plane to macroblock_plane.

Change-Id: I8eb919acc837acfb3abdd8319af63d1bbca8217a

Renaming constants for consistency:
  DCT_VAL_CATEGORY1 => CATEGORY1_TOKEN
  DCT_VAL_CATEGORY2 => CATEGORY2_TOKEN
  DCT_VAL_CATEGORY3 => CATEGORY3_TOKEN
  DCT_VAL_CATEGORY4 => CATEGORY4_TOKEN
  DCT_VAL_CATEGORY5 => CATEGORY5_TOKEN
  DCT_VAL_CATEGORY6 => CATEGORY6_TOKEN
  DCT_EOB_TOKEN     => EOB_TOKEN
  DCT_EOB_MODEL_TOKEN => EOB_MODEL_TOKEN
  MAX_ENTROPY_TOKENS => ENTROPY_TOKENS

Moving constants:
  INTER_MODE_CONTEXTS from vp9_entropy.h to vp9_blockd.h.
  EOSB_TOKEN from vp9_entropy.h to vp9_tokenize.h

Change-Id: I5fcbf081318e1d365792b6d290a930c6cb0f3fc2

Its last remaining caller can be passed its results directly without any
additional work. Also, it's not non-4:2:0 safe.

Change-Id: Ia5089ba5f7f66c7617270483c619c9271aefd868

This commit fixes the use of uv_intra_estimate by properly restoring
the mode_info struct required by rd_pick_intra_sbuv_mode.

Change-Id: I6a156d79533c4e2e60dfd3b8c5bb0a42a8eca280

Change-Id: I5a5888d4639cc6b7eb266be47581dd15ba08c91e

We only need qcoeff buffers in the encoder. Reducing TileWorkerData struct
and VP9Decompressor struct sizes by 24K.

Change-Id: Id148868461f7ffa3d3dd634b371503ae9c57e207

Change-Id: Iae16644faeed920e69cd5d1db71e2e1e4bda241c

Change-Id: I248ccb1532e2cd95314d0b95108f2c2e71cf084f

Change-Id: I406021e34b31b899202a99b39d3da4fa06ebee69

Renaming vp9_init_mode_costs() to fill_mode_costs() and moving it to
vp9_rdopt.c.

Change-Id: Ib2542d216458f6dced9f4b7ccbdd2cd98176aa5a

This function is also used with the U and V planes.

Change-Id: Ib6beae0438790bfb690b3a2bda9c5c8b0e89a9b8

List of renames:
  COMPPREDMODE_TYPE      => REFERENCE_MODE
  SINGLE_PREDICTION_ONLY => SINGLE_REFERENCE
  COMP_PREDICTION_ONLY   => COMPOUND_REFERENCE
  HYBRID_PREDICTION      => REFERENCE_MODE_SELECT (like TX_MODE_SELECT)
  NB_PREDICTION_TYPES    => REFERENCE_MODES

Change-Id: If723dabe9435325d0165dcd028142a2c78b417b4

Change-Id: Ie829ee58a55157e6972c63cebe69a5d0a3221349

Change-Id: I9d18b31661a2ccdcd4e25956882c7fc2d4b7002e

Change-Id: I29c0dfcf41a1253d5e2a0d2ff740c0c38ebaa5a2

Change-Id: Iadd771a33c8874f3b774923bca4da3c8fe5429ee

There are many places in handle_inter_mode that need to restore the
dst buffer pointers, due to buffer pointer swap and early rd search
breakout. This commit wraps these operations into an inline function
for clean-up.

Change-Id: I0462e8c41c8bc3cd8db07395489cac03d8e5be54

There is no need to use that function, it is much clear to pass offset
directly to the buffer.

Change-Id: I9026cb0c5094c46f97df5d7f7daeb952f2843b24

Commit a4a5a210 enabled lossless coding, but the commit incorrectly
disabled the usage of skip in encoder even when skip should be used.
This commit make sure that skip is enabled even in lossless mode.

Change-Id: I276954f952c6ac68f17a316ebc72f09001228a08

There was only one function in *.c file, so moving it to vp9_encodemb.c.

Change-Id: I728859d08b3d6c05c33c1c5b21f0ea1d0e0f83af

Overall change (using dual buffer scheme for superblocks of both inter
and intra modes) reduces speed 2 runtime:
bluesky_1080p at 6000kbps:   263553ms -> 257441ms
riverbed_1080p at 8000kbps:  233230ms -> 225308ms.

Change-Id: Idf8d70f768a4b0d97b2a8506372c57b7b4022119