Paul pointed out that the pointer to the gf_active_flags is not being
properly incremented in multithreaded encoder. This commit fixes the
issue by making sure the gf_active_ptr points to the starting of next
group of mb rows.

Change-Id: I3246e657d23beabb614dfb880733a68a5fd7e34c

Code cleanup.

Change-Id: Ic8b0167851116c64ddf08e8a3d302fb09ab61146

The skip flag is never set by the encoder for SPLITMV.

Change-Id: I5ae6457edb3a1193cb5b05a6d61772c13b1dc506

The dc_diff flag is used to skip loopfiltering.  Instead
of setting this flag in the decoder/encoder, we now check
for this condition in the loopfilter.

Change-Id: Ie2b9cdf9e0f4e8b932bbd36e0878c05bffd28931

force_no_skip is always set to zero.

Change-Id: I89b61c5e0bee34627a9c07c05f3517e1db76af77

Code cleanup.  The build inter predictor functions are
redundantly checking the mode_info_context for either
INTRA_FRAME or SPLITMV.

Change-Id: I4d58c3a5192a4c2cec5c24ab1caf608bf13aebfb

in encodframe.c, quant_shift is set to 0 or 1 in vp8cx_invert_quant

only use 8 bits to store this, instead of 16. will allow saving an
xmm register in an updated version of the regular quantize

Change-Id: Ie88c47fe2aff5af0283dab1147fb2791e4b12f90

Remove encoding speed limitation in real-time mode.

Change-Id: Ib5e35d8bb522b2a25f3e4ad5cfe2788ebebb3617

Clean up the code.

Change-Id: I7db048efa4d972b528d553a7921bc45979621129

The error accumulator stats values cpi->prediction_error and
cpi->intra_error were being populated with rd values not
distortion values.

These are only "currently" used in a limited way for RT compress
key frame detection.

Change-Id: I2702ba1cab6e49ab8dc096ba75b6b34ab3573021

MV sad cost error is only used in full-pixel motion search,
which only need full-pixel resolution instead of quarter-pixel
resolution. This change reduced mvsadcost table size, and
removed unneccessary pamameter passing since this table is
constant once it is generated.

Change-Id: I9f931e55f6abc3c99011321f1dfb2f3562e6f6b0

Thread synchronization was not correct when frame width was 1 MB.
Number of allocated encoding threads is limited by the sync_range.
There is no point having more because each thread lags sync_range MBs
behind the thread processing the row above.

http://code.google.com/p/webm/issues/detail?id=302

Change-Id: Icaf67a883beecc5ebf2f11e9be47b6997fdf6f26

The vp8_build_intra_predictors_mby and vp8_build_intra_predictors_mby_s
functions had global function pointers rather than using the RTCD
framework. This can show up as a potential data race with tools such as
helgrind. See https://bugzilla.mozilla.org/show_bug.cgi?id=640935
for an example.

Change-Id: I29c407f828ac2bddfc039f852f138de5de888534

Allow compiling without adding vp8/{common,encoder,decoder} to the
include paths.

Change-Id: Ifeb5dac351cdfadcd659736f5158b315a0030b6c

Change-Id: Icf4b692099d7d249fe3553852b1022b027b28e4b

Improved performance of good quality, speed 0 (3% average)
with no average quality loss.

Change-Id: Ica34473f99bd74260eaebde6b132185e09e3c09d

The encoder was not correctly catching transitions in the quantizer
deltas. If a delta_q was set, then the quantizer would be reinitialized
on every frame, but if they transitioned to 0, the quantizer would
not be reinitialized, leading to a encode-decode mismatch.

This bug was triggered by commit 999e155f, which sets a Y2 delta Q
for very low base Q levels.

Change-Id: Ia6733464a55ee4ff2edbb82c0873980d345446f5

Then removed unnecessary code.

Change-Id: I142658815d843c9396b07881dbdd8d387c43c90e

Restructured function in order to eliminate the prediction
modes save/restore.  Code cleanup also.

Change-Id: I816e3b910de64d0f0f0ddc2398805c63263191e8

Reduce the number of sync points by letting each thread
continue imediatly with a new MB row.
Better multicore scaling, improves performance by 5-20% on ARM multicore.

Change-Id: Ic97e4d1c4886a842c85dd3539a93cb217188ed1b

from vp8cx_encode_intra_macro_block.  prediction_error is used when
deciding if a frame should be a keyframe.  After reviewing this with
Yaowu, it was pointed out that vp8cx_encode_intra_macro_block
is only called for keyframes, so the accumulation is unnecessary.

Change-Id: Id79dc81b80d4f5d124f3a0dba1b923887e2e1ec8

vp8_pick_intra4x4mby_modes uses the passed in distortion
for an early breakout.  The best distortion was never saved
and the distortion for TM_PRED was always used.

Change-Id: Idbaf73027408a4bba26601713725191a5d7b325e

The condition for using RD when selecting the intra coding mode
for a MB is that the RD flag is set AND we're not in real-time
mode.

Previously the code used RD if either the RD flag was set OR
we were not using real-time mode.

Change-Id: Ic711151298468a3f99babad39ba8375f66d55a08

vp8cx_mb_init_quantizer was being called for every mode checked
in vp8_rd_pick_inter_mode.  zbin_extra is the only value that
really needs to be recalculated.  This calculation is disabled
when using the fast quantizer for mode selection.
This gave a small performance boost (~.5% to 1%).
Note: This needs to be verified with segmentation_enabled.

Change-Id: I62716a870b3c82b4a998bdf95130ff0b02106f1e

This code fixes a bug in the calculation of
the minimum Q for alt ref frames.

It also allows an extended gf/arf interval for sections
of clips that completely static (or nearly so).

Change-Id: I1a21aaa16d4f0578e5f99b13bebd78d59403c73b

Removing unused local variables causing compiler warnings in
Visual Studio.

Change-Id: I0e2096303be1fdbc01428a6e57cca9796bb32c8a

cpi->target_bits_per_mb is currently not being used,
so delete it.  Also removed other unused code in rdopt.c.

Change-Id: I98449f9030bcd2f15451d9b7a3b9b93dd1409923

Use the fast quantizer for inter mode selection and the
regular quantizer for the rest of the encode for good quality,
speed 1.  Both performance and quality were improved.  The
quality gains will make up for the quality loss mentioned in
I9dc089007ca08129fb6c11fe7692777ebb8647b0.

Change-Id: Ia90bc9cf326a7c65d60d31fa32f6465ab6984d21

Add a new encoder control, VP8E_SET_TUNING, to allow the application
to inform the encoder that the material will benefit from certain
tuning. Expose this control as the --tune option to vpxenc. The args
helper is expanded to support enumerated arguments by name or value.

Two tunings are provided by this patch, PSNR (default) and SSIM.
Activity masking is made dependent on setting --tune=ssim, as the
current implementation hurts speed (10%) and PSNR (2.7% avg,
10% peak) too much for it to be a default yet.

Change-Id: I110d969381c4805347ff5a0ffaf1a14ca1965257

The fast quantizer assembly code has not been updated to match the new
exact quantizer, which was made the default in commit 6adbe090.
Specifically, they are not aware of the potential for the coefficient
to be scaled, which results in the quantized result exceeding the range
of the DCT. This patch restores the previous behavior of using the
non-shifted coefficients when in the fast quantizer code path, but
unfortunately requires rebuilding the tables when switching between the
two.

Change-Id: I0a33f5b3850335011a06906f49fafed54dda9546

Small changes to the default zero bin and rounding tables.
Though the tables are currently the same for the Y1 and Y2 cases
I have left them as separate tables in case we want to tune this later.

There is now some adjustment of the zbin based on the prediction mode.
Previously this was restricted to an adjustment for gf/arf 0,0 MV.

The exact quantizer now marginal outperforms and is the default.

The overall average gain is about 0.5%

Change-Id: I5e4353f3d5326dde4e86823684b236a1e9ea7f47

Most of the code that actually uses these matrices indexes them as
 if they were a single contiguous array, and coverity produces
 reports about the resulting accesses that overflow the static
 bounds of the first row.
This is perfectly legal in C, but converting them to actual [16]
 arrays should eliminate the report, and removes a good deal of
 extraneous indexing and address operators from the code.

Change-Id: Ibda479e2232b3e51f9edf3b355b8640520fdbf23

This patch moves the scattered updates to the mb skip state
(mode_info_context->mbmi.mb_skip_coeff) to vp8_tokenize_mb. Recent
changes to the quantizer exposed a bug where if a macroblock
could be coded as a skip but isn't, the encoder would run the
loopfilter but the decoder wouldn't, causing a reference buffer
mismatch.

The loopfilter is controlled by a flag called dc_diff. The decoder
looks at the number of decoded coefficients when setting this flag.
The encoder sets this flag based on the skip state, since any
skippable macroblock should be transmitted as a skip. The coefficient
optimization pass (vp8_optimize_b()) could change the coefficients
such that a block that was not a skip becomes one. The encoder was
not updating the skip state in this situation for intra coded blocks.

The underlying issue predates it, but this bug was recently triggered
by enabling trellis quantization on the Y2 block in commit dcd29e36,
and by changing the quantizer range control in c...

This uses MB variance to change the RDO weight for mode decision
 and quantization.
Activity is normalized against the average for the frame, which is
 currently tracked using feed-forward statistics.
This could also be used to adjust the quantizer for the entire
 frame, but that requires more extensive rate control changes.
This does not yet attempt to adapt the quantizer within the frame,
 but the signaling cost means that will likely only be useful at
 very high rates.

Change-Id: I26cd7c755cac3ff33cfe0688b1da50b2b87b9c93

Moved the bounds computation on vertical MV component out
of the loop that processes MBs within a MB row.

Modified AltRef temporal filter to adapt filter length based
on macroblock coding modes selected during first-pass
encode.

Also added sub-pixel motion compensation to the AltRef
filter.

Changes 'The VP8 project' to 'The WebM project', for consistency
with other webmproject.org repositories.

Fixes issue #97.

Change-Id: I37c13ed5fbdb9d334ceef71c6350e9febed9bbba

Moved partition_bmi and partition_count out of MB_MODE_INFO and
placed into MACROBLOCK.  Also reduced the size of other members
of the MB_MODE_INFO struct.  For 1080p, the memory was reduced
by 1,209,516 bytes.  The decoder performance appeared to improve
by 3% for the clip used.
Note:  The main goal for this change is to improve the decoder
performance.  The encoder will be revisited at a later date for
further structure cleanup.

Change-Id: I4733621292ee9cc3fffa4046cb3fd4d99bd14613

Change-Id: I8b9fdf9875a8fcff4cb49a3357ce44f18108c2e7

This allows experiments of using different rounding and
zerobin constants for 2nd order blocks.

Change-Id: Idd829adba3edd1f713c66151a8d29bb245e33a71