This commit enables bit-stream writing and reading for recursive
partition down to block 8x8.

Change-Id: I163cd48d191cc94ead49cbb7fc91374f6bf204e2

Unify the various vp9_optimize_sb functions into one that handles all
transform sizes.

Change-Id: I48b642fbfb3e72cc2e0bcf1d0317a80a80547882

The decode_mb only carries I8X8_PRED decoding, which will be covered
by the regular MB intra modes when SB8X8 is on. To be removed later.

Change-Id: I3b9ee55917a30b42518b81987bc10c22b1a19e7f

Change-Id: If02e006aa8a89da9de23da92362bd2e7718ea07c

Work-in-progress, not yet ready for review. TODO items:
- bitstream writing (encoder) and reading (decoder)
- decoder reconstruction

Change-Id: I5afb7284e7e0480847b47cd0097cb469433c9081

Change-Id: Iab9a88f250614a790b6ad96bf3150a74210910df

Moving common code from encoder and decoder to vp9_update_frame_size.

Change-Id: I6ca758b7d05ffd52821bd3f7ad68089da11e4165

Separate the decoding process of 4x4 block based coding (both intra
and inter) from decode_mb and move it into decode_atom_. This allows
to further move the rest per 16x16 block decoding of decode_mb into
decode_sb, and hence eventually deprecating decode_mb when SB8X8 is
enabled.

Change-Id: I678cb8007d8a57b792d7a23020edb0c74fbf4237

Separate the functionality of I4X4_PRED from decode_mb. Use
decode_atom_intra instead, to enable recursive partition of superblock
down to 8x8.

Change-Id: Ifc89a3be82225398954169d0a839abdbbfd8ca3b

Fixes mismatches on yt.

Change-Id: I65444137578b29a4984af5c01b2874c5ab086acc

Ensures that the full 64 pixel border is available for prediction (need a minimum of
64+INTERP_EXTEND on all sides, and 32+INTERP_EXTEND on UV). Value also must be a
multiple of 32 to keep UV stride alignment. The smaller border was causing the prediction
to read outside the frame, which can cause a mismatch.

TODO: Get rid of this explicit border and use edge emulation instead.

Change-Id: I3f68453a088ec0ab4349d0f5cc02b573be06d7c4

Moving code from vp9_pack_bitstream to new function encode_segmentation.

Change-Id: I1f1e59a1f038618ad95162b7db4b6f8164850ea8

Also fixed two minor subtle boundary conditions in intra prediction
code, and replaced memcpy/memset with vpx_ prefixed version.

Change-Id: I9cddff3be831228b628f1f2f065a61feacbcbee6

Change-Id: I7442b4600b6812bed13e655ccf68f9ea56cc83a2

The commmit changed to use same intra prediction function for all
block sizes.

Some details on the changes:
1. All directional modes except DC/TM/V/H now have built-in filtering
for all pixels with filter taps either (1, 2, 1)/4 or (1, 1)/2.
2. Above edge get automatic extended to double width (bw*2), which
makes a lot of the prediciton mode computation simpler.
3. Same intra prediction function is called with different size
for i4x4_pred and all other larger size.

Overall, the change helped keyframe only coding for both cif size
and std-hd size test sets by .5% consistently on all encodings.
For normal coding with single/auto key frame, the change now also
is consistently net positive for all encodings. The overall gains
is about .15% on std-hd set.

Change-Id: I01ceb31fbc73d49776262e6bdc06853b03bbd1d1

Incorrect strides caused use of uninitialized stack data.

Change-Id: Ifc12174285311bcf0453987d4283e91141f979ef

Updates the tokenizer to use the common block walker used by the
detokenizer, to support non-4:2:0 and more than 3 planes.

Change-Id: If1854117a9c7c1427349209fa2b3051ce6459dcb

Change-Id: Ifd1f7319e398381ca7d55aaacc68c39a1319d651