For non-SVC 1 pass CBR: make the GF update interval a multiple of the
cyclic refresh period, and use encoding stats to prevent GF update at certain times.

Change-Id: I4c44cacc2f70f1d27391a47644837e1eaa065017

Change-Id: Ib85b5bc135aa0907a76b8c74faafe577e27d014f

Target higher delta-qp for big blocks with zero motion,
and for segment#1: avoid 64x64 partition size and force 8x8 tx size.

Metrics on RTC set mostly positive: SSIM up by ~4%, PSRN by ~1.5%.
Doesn't seem to be any change in speed.

Change-Id: I1f68fa3c4f62dab3b90cc58041f05ebb048ae5ac

Add distortion threshold condition to refresh state of a coding block,
and allow for qp adjustment also for some intra modes and non-zero motion modes.

Also some code cleanup (remove unused variables/code).

Change-Id: I735fa2b28bc64f60e0323976b82510577b074203

For a few refresh periods after key frame, use large qp-delta
to increase quality ramp-up.

Change-Id: Ib5a150fb2dfa6bafd0d4e6b5d28dfd0724b61319

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

Change-Id: I1dc60fb230e7d08357fae18909d8ed27bf58e037

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

Two members in struct CYCLIC_REFRESH
  int64_t projected_rate_sb;
  int64_t projected_dist_sb;
are updated at the superblock level, which makes them shared data
in the multi-thread situation, and requires extra work to handle
them. However, those values are updated and used immediately, and
therefore can be removed. This patch cleaned up the code and
removed the two members.

Change-Id: I2c6ee4552bf49fb63ce590cdb47f9723974fffb1

This commit removes the cyclic aq mode dependency on
in_static_area and reworks the corresponding cut-off thresholds.
It improves the compression performance of speed -5 by 1.47% in
PSNR and 2.07% in SSIM, and the compression performance of speed
-6 by 3.10% in PSNR and 5.25% in SSIM. Speed wise, about 1% faster
in both settings at high bit-rates.

Change-Id: I1ffc775afdc047964448d9dff5751491ba4ff4a9

Adds various high bitdepth quantization functions.

Change-Id: I36fc0bf75a1bd15128ed271df8723de0ac134b0c

vp9_rdopt is for making rd optimal mode decisions. vp9_rd is for all
other rd related routines. Anything used outside of making an rd optimal
decision belongs in rd.

Change-Id: I772a3073f7588bdf139f551fb9810b6864d8e64b

This commit enables a background detection approach for adaptive
quantizer control. It combines the cyclic refresh pattern and the
background information to determine the segment id for adaptive
quantizer selection, prior to the non-RD mode decision process.
It hence allows proper quantization information update for a more
precise rate-distortion modeling in the non-RD mode decision.

The compression performance of speed -5 for rtc set is improved
by 2.5%, at no speed change.

Change-Id: Ic3713e8ed9185b403b5b1679d19dabd57506d452

Just to be consistent with min_frame_bandwidth & max_frame_bandwidth names.

Change-Id: I36702c708cba9ad1a5c36393f37758a2edeadb90

Change-Id: If0e9c811c8ae78c0914d615bad0067a5b57e4a71

Change-Id: I512f2a287dd8765879a2d1144e2f028dc65f71ff

For real-time mode under cbr, this increases the gain (5-10%)
for speed 5 (none/little change for 6), on vc-clips.

Change-Id: I9b38beeb3c820de22c43a0ba53a9456168dd24ba

Removes a TODO. Changed meaning of some parameters
(target-max-percent refresh and starting index) to be
defined relative to superblock. Also, modify turn-off condition.

Change-Id: I5e55f372b7079c24f9cdac0b06fa34620dbf456b

Change-Id: I32695ad703dcbbbbf5f122b403f3d3120a0be366

Change-Id: I288e5ffade508fc3c803986d47ccf06df8d784dd

Change-Id: I398decf319c8f4d1b3abe1f276e009840e61b684

Change-Id: Id76a628495c822e23825b66a7589b4a3279680e2

Activated using aq_mode=3.

Change-Id: Ied628b9e7bd0e88b0c75790276bca75b19eb5c07