The commit changes the coding mode to lossless whenever the lowest
quantizer is choosen.

As expected, test results showed no difference for cif and std-hd
set where Q0 is rarely used. For yt and yt-hd set, Q0 is used for
a number of clips, where this commit helped a lot in the high end.

Average over all clips in the sets:
yt: 2.391% 1.017% 1.066%
hd: 1.937%  .764%  .787%

Change-Id: I9fa9df8646fd70cb09ffe9e4202b86b67da16765

This issue breaks the encoding process of the codebase. The effect
emerges only in particular test sequence at certain bit-rates and
frame limits.

Change-Id: I02e080f2a49624eef9a21c424053dc2a1d902452

Change-Id: Ie309cb1f683a51c5dfac405fb32e8e2d6ee143ed

Change-Id: I7a5314daca993d46b8666ba1ec2ff3766c1e5042

Since there is no Y2, these values are always zero. This changes the
bitstream results slightly, hence a separate commit.

Change-Id: I2f838f184341868f35113ec77ca89da53c4644e0

Change-Id: I4f46d142c2a8d1e8a880cfac63702dcbfb999b78

allowing the compiler to inline.

Change-Id: I66e5caf5e7fefa68a223ff0603aa3f9e11e35dbb

Used same algorithm as others.

Change-Id: Ifdac560762aec9735cb4bb6f1dbf549e415c38a0

These allow sending partial bitstream packets over the network before
encoding a complete frame is completed, thus lowering end-to-end
latency. The tile-rows are not independent.

Change-Id: I99986595cbcbff9153e2a14f49b4aa7dee4768e2

Since addition of the larger-scale transforms (16x16, 32x32), these
don't give a benefit at macroblock-sizes anymore. At superblock-sizes,
2nd-order transform was never used over the larger transforms. Future
work should test whether there is a benefit for that use case.

Change-Id: I90cadfc42befaf201de3eb0c4f7330c56e33330a

This patch abstracts the selection of the coefficient band
context into a function as a precursor to further experiments
with the coefficient context.

It also removes the large per TX size coefficient band structures
and uses a single matrix for all block sizes within the test function.

This may have an impact on quality (results to follow) but is only an
intermediate step in the process of redefining the context. Also the
quality impact will be larger initially because the default tables will
be out of step with the new banding.

In particular the 4x4 will in this case only use 7 bands. If needed we
can add back block size dependency localized within the function, but
this can follow on after the other changes to the definition of the
context.

Change-Id: Id7009c2f4f9bb1d02b861af85fd8223d4285bde5

Reverted part of change
I19981d1ef0b33e4e5732739574f367fe82771a84

That gives rise to an enc/dec mismatch.
As things stand the memsets are still needed.

Change-Id: I9fa076a703909aa0c4da0059ac6ae19aa530db30

This is an initial step to facilitate experimentation
with changes to the prior token context used to code
coefficients to take better account of the energy of
preceding tokens.

This patch merely abstracts the selection of context into
two functions and does not alter the output.

Change-Id: I117fff0b49c61da83aed641e36620442f86def86

1. Added a bit in frame header to  to indicate if a frame is encoded
in lossless mode, so decoder does not make the decision based on Q0
2. Minor changes to make sure that lossy coding works same as when
the lossless experiment is not enabled.
3. Renamed function pointers for transforms to be consistent, using
prefix fwd_txm and inv_txm for forward and inverse respectively

To encode in lossless mode, using "--lossless=1 --min-q=0 --max-q=0"
with vpxenc.

Change-Id: Ifae53b26d2ffbe378d707e29d96817b8a5e6c068

Change-Id: I95acfc1417634b52d344586ab97f0abaa9a4b256

Initial ssse3 convolve avg functions and is one step closer
to using x86inc.asm.  The decoder performance improved by 8% for
the test clip used.  This should be revisited later to see if
averaging outside the loop is better than having many similar
filter functions.

Change-Id: Ice3fafb423b02710b0448ffca18b296bcac649e9

Removal of the  NEWCOEFCONTEXT experiment to
reduce code clutter and make it easier to experiment with
some other changes to the coefficient coding context.

Change-Id: Icd17b421384c354df6117cc714747647c5eb7e98

Removal of experiment to simplify code base for other
changes.

Change-Id: If0a33952504558511926ad212bc311fc2bffb19a

A couple of scalar optimizations speeding up quantization by about 1.6x. Overall encoder speedup is around 3%.

Change-Id: I19981d1ef0b33e4e5732739574f367fe82771a84

This is after discussion with the hardware team. Update the unit test
to take these sizes into account. Split out some duplicate code into
a separate file so it can be shared.

Change-Id: I8311d11b0191d8bb37e8eb4ac962beb217e1bff5

Use consistent algorithm.

Change-Id: Ib8484821ebc454b9d3380a3d6571798decd037f3

Change-Id: I47174f797df2103da8913c6fb4f4e741817bae82

Implement convolve8_avg using common functions which are already optimized
instead of using more obscure ones which have only C versions. Encoder
overall speed-up of about 12%.

Change-Id: I8c57aa76936c8a48f22b115f19f61d9f2ae1e4b6