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This commit adds encoder side control for vp9 to set color space info
in the output compressed bitstream.

It also amends the "vp9_encoder_params_get_to_decoder" test to verify
the correct color space information is passed from the encoder end to
decoder end.

Change-Id: Ibf5fba2edcb2a8dc37557f6fae5c7816efa52650

Don't put small empty frame in front of a key frame. We will
put key frame flag in webm container if there's a visible key
frame. But there will be decoding error when we seek to here
if we put the small empty frame, which will be inter frame,
in front of it.

Change-Id: Id50c2c1fd31da0405ff6faa7375cc2f49c55402d

This commit added a field to vpx_image_t for indicating color space,
the field is also added to YUV_BUFFER_CONFIG. This allows the color
space information pass through the decoder from input stream to the
output buffer.

The commit also updated compare_img() function with added verification
of matching color space to ensure the color space information to be
correctly passed from encode to decoder in compressed vp9 streams.

Change-Id: I412776ec83defd8a09d76759aeb057b8fa690371

Add optimized Neon functions of:
vp9_variance32x64
vp9_variance64x32
vp9_variance64x64

On Nexus 7 speed -5 and -6 saw about a 4% increase in perf.
Speeds -7 and -8 saw about a 6% increase in perf.
Tested on Nexus 7, built with ndk r10d, gcc 4.9.

Change-Id: I5a81f13c9897eb927fa39662530f5524a0f768fa

Added unittest that triggers the crash without this fix.

Issue: https://code.google.com/p/webm/issues/detail?id=911

Change-Id: If5208ceb210c821891675fdf3d9951ab83d52ae6

Change-Id: Id537d1126f25c0218adcfb4d6ee641ee81a2169a

Change-Id: If64052cc6e404abc8a64a889f42930d14fad21d3

Replaced "color space" with "color format" in comments where color
sampling format is concerned, so to differentiate from the concept
defined in COLOR_SPACE.

Change-Id: I8c935034c166b24307a99352dab1686531276bb8

This commit refactors the motion compensated reference block fetch
process in denoiser. It skips the stage that generates motion
compensated reference block if denoiser decides to use copy block
mode. For high motion clips, this could speed up the denoising
process by about 10%.

Change-Id: I8ef4fa5fe766a8c4529119b9ec01faefb3d4ef53

This could save one multiplication in each threshold funtion
called by the denoiser per block.

Change-Id: I35f437e09999f0a087180878ef7805f0d86e5819

Use frame buffer pointer swap instead of memcpy when possible.
These two CLs make the denoiser when running on vidyo1 720p at
speed -6 over 10% faster.

Change-Id: I64fe8a2422cafca6787a50c7f4dfb961191c0a9d

Change-Id: Ifd2813e8ccd8af189a8dc89b24efb6a5681714c7

Replace copy_block with vp9_convolve_copy for speed performance
improvement.

Change-Id: I3a08c4d01dff2253b6ee573efd02f65ccdc1b5a5

Change-Id: I60f7ccbbc8dc624134e325bdce6042bc183075b6

These two parameters are used to control the denoiser cut-off
thresholds. They should be properly initialized when starting
mode search of a given block.

Change-Id: Iba8a25487026a0dbe0d350c347d7e4e4e237b637

Change-Id: I2c38ea2bcf6d221a0b6b2fb9be4cebbee21006a3

This fixes the issue that sub8x8 inter blocks always end up
with GOLDEN_FRAME.

Change-Id: Id0c25cbb9c2003f43b4dff8fb1572512c246e077

Replace ref_frame++ with ++ref_frame.

Change-Id: Ic39793081156c314bf1b85d5ab76def97f3bff52