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Currently, VP9 supports column-tile encoding, which allows a frame
to be encoded in multiple column tiles independently. The number of
column tiles are set by encoder option "--tile-columns". This
provides a way to encode a frame in parallel.

Based on previous set of patches, this patch implemented the tile-
based multi-threaded encoder. Each thread processes one or more
tiles.

Usage:
For HD clips:
--tile-columns=2 --threads=1/2/3/4

While using 4 threads, tests showed that the encoder achieved
2.3X - 2.5X speedup at good-quality speed 3, and 2X speedup at
realtime speed 5.

Change-Id: Ied987f8f2618b1283a8643ad255e88341733c9d4

This commit makes the codec automatically turn on error resilient
mode when using real-time mode for temporal scalable coding. It
fixes an enc/dec mismatch issue and re-enables the corresponding
unit test.

Change-Id: Ie1f7134e9a78ddd43e9b1555b3ee991c8a3afd0d

Incorporate segment delta-q into estimated bits.
This generally improves the rate control under cyclic refresh (aq=3) mode.

Change-Id: I1dc60fb230e7d08357fae18909d8ed27bf58e037

A hidden enc/dec mismatch bug was accidentally triggered by
https://gerrit.chromium.org/gerrit/#/c/72247/
Adaptively adjust mode test kick-off thresholds in RTC coding

This commit temporarily turns off the broken unit tests to avoid
blocking other CLs while fixing.

Change-Id: I0a0f195030321190ce10879cd833187680576367

Probably not even the dominant platform the library is being built for.
Add --cpu= option description to help. The option already exists.

Don't allow passing just --cpu as a no-op.

BUG=826

Change-Id: Iaa3f4f693ec78b18927b159b480daafeba0549c0

Change-Id: I5f723ada144d0bd82ee700ef28a4916fd64ba5e4

This parameter is initialized as 50. No need to re-assign the
same value in speed -6.

Change-Id: I8735a5593412df2fdcee53ae45c8ebd1c3d792e7

Each tile's tok starting address is calculated before the encoding
process. These addresses are stored so that the same calculation
won't be done again in packing bit stream.

Change-Id: I0a3be0301f002260c19a850303f2f73ebc47aa50

When the golden frame is boosted, the rate correction factor is not
correlated well with other inter frames even in CBR mode. This commit
changes to use GF specific rate_correction_factor when gf_cbr_boost
is greater than 20%.

Change-Id: I6312c1564387bcacc11f4c5e8a9cfdc781b5c3ab

vp8_config doesn't need to be on the stack. Just use a local copy.

Change-Id: Ia241b1d87fd9422556d957f3ea43ad71eb5c414a

Change-Id: Ic072585ebffdb36982ed7b8b9f875ca6c1c656c4

This commit allows the encoder to increase the mode test kick-off
thresholds if the previous best mode renders all zero quantized
coefficients, thereby saving motion search runs when possible.
The compression performance of speed -5 and -6 is down by -0.446%
and 0.591%, respectively. The runtime of speed -6 is improved by
10% for many test clips.

vidyo1, 1000 kbps
16578 b/f, 40.316 dB, 7873 ms -> 16575 b/f, 40.262 dB, 7126 ms

nik720p, 1000 kbps
33311 b/f, 38.651 dB, 7263 ms -> 33304 b/f, 38.629 dB, 6865 ms

dark720p, 1000 kbps
33331 b/f, 39.718 dB, 13596 ms -> 33324 b/f, 39.651 dB, 12000 ms

mmoving, 1000 kbps
33263 b/f, 40.983 dB, 7566 ms -> 33259 b/f, 40.978 dB, 7531 ms

Change-Id: I7591617ff113e91125ec32c9b853e257fbc41d90

This patch modified struct VP9_COMP. Created a struct ThreadData
to include data that need to be copied for each thread. In
multiple thread case, one thread processes one tile. all threads
share one copy of VP9_COMP,
(refer to VP9_COMP *cpi in the code)
but each thread has its own copy of ThreadData,
(refer to ThreadData *td in the code).
Therefore, within the scope of encode_tiles(), both cpi and td
need to be passed as function parameters.

In single thread case, the FRAME_COUNTS pointer in ThreadData
points to "counts" in VP9_COMMON.

Change-Id: Ib37908b2d8e2c0f4f9c18f38017df5ce60e8b13e

Change-Id: I90ad08823e1d038384536fa9f458caadc2c87f38

The intra mode penalty is covered by intra_cost_penalty. This
commit removes the other intra cost threshold, provided that the
constant 50 is negligible in normal rate-distortion cost.

Change-Id: I9b8b7483c43b9a41741622e7057def1f7d51bb72

This change is made in preparation for a
subsequent patch which adds acceleration
for the highbitdepth transform functions.

The highbitdepth transform functions attempt
to use 16/32bit sse instructions where possible,
but fallback to using the C implementations if
potential overflow is detected.  For this reason
the dct routines are made global so they can be
called from the acceleration functions in the
subsequent patch.

Change-Id: Ia921f191bf6936ccba4f13e8461624b120c1f665
(cherry picked from commit 454342d4e77dbb67f4a3c10f97a57a6fcb46d9a0)

This commit makes a non-RD coding mode decision process for key
frame coding. It can be optionally turned on in speed -6 and above.

Change-Id: I0847258b392877a0210b4768bef88ebc9ad009b5

previously 'bit_depth_', which is later used to calculate 'mask_', would
be left uninitialized in non-high-bitdepth builds

Change-Id: Ia72035f4645baf3bb0f191504f491b934cdf1e0e

Whitespace changes only.

Change-Id: I92eef49db1798bc69ec003fca69995fea560d6fa

* changes:
  Remove rate component adjustment for AQ1
  Switch AQ1 segment basis from q ratio to rate ratio.

Condition existed for temporal case, added it for spatial as well.
Issue: https://code.google.com/p/webm/issues/detail?id=878.

Change-Id: I38339207f9a94924f5568a081eabe64f867a686d

Change-Id: Ib8810d431fa20a2c78e0caaa28eb2c99903e60fb