Removing assign_and_clamp_mv function, making implementation of clamp_mv
and clamp_mv2 more clear and consistent.

Change-Id: Iecd08e1c1bf0379f8314ebe01811f8253f4ade58

Adds a function to compute source variance for various
sb_types to be used for pruning mode and partition searches.
[The existing activity measure function is currently specialized
for only 16x16 MBs and needs to be updated].

Change-Id: I22a41e6f1430184201487326fdbebb9b47e6fc24

Change-Id: Icd128ab58719e0b9066bdfa66a5d0d427a84d6df

Change-Id: I8beeee4c020425175f7d5ec83be86afa7b95da1a

This commit exploits the sparsity of quantized coefficient matrix.
It detects each 32x8 array and skip the corresponding inverse
transformation if all entries are zero.

For ped1080p at 8000 kbps, this on average reduces the runtime of
32x32 inverse 2D-DCT SSE2 function from 6256 cycles -> 5200
cycles. It makes the overall encoding process about 2% faster at
speed 0. The speed-up is more pronounceable for the decoding process.

Change-Id: If20056c3566bd117642a76f8884c83e8bc8efbcf

This commit removes redundant arguments passing in the function of
rd_pick_reference_frame. This resolves the clang warnings about
potential use of uninitialized values.

Change-Id: Ic68f949a9f8fcd0a583786b0c75321104ea44739

Inlining VP9_NMV_UPDATE_PROB constant, consistent local variable names.

Change-Id: I01692501982568fa535882d6b320e3c692f88abb

Passing mi_row and mi_col parameters to functions explicitly. Removing
unused xd argument from scale_mv function.

Change-Id: Icb4c495ec72d26fb066c14470d3ae0b741fbf18a

Using different variable names "allow_hp" and "use_hp" instead of "usehp".

Change-Id: I0cd5996ddeb46bd754473b680a993c0aaf8eb879

Refactor the frame buffer referencing in choose_partition and make
it consistent with other places. This means to prevent potential
issues when we extend reference frame buffer.

Change-Id: I5ff33ed5f671e1f4cc7049622212769a9b4578d9

Using inter-mode counts instead of inter-mode-tree branch counts inside
FRAME_COUNTS structure.

Change-Id: I60dde13af37d06146d7d15543311c1b5044e9e04

Change-Id: I9c30e3dbedabe4942439a0ee2f691fb9a04cd03b

Removed unnecessary code lines, replaced switch with an if,
fixed spelling errors and formatting.

Change-Id: Ie48aa4604aa0ed48362ca359d792fb21b2ec1dc6

Change-Id: Ica23b66f6664e5a5b168499584f0afffbc54794f

The tokenize_b function is only called when output flag is on. Hence
removing the conditional branch on it therein.

Change-Id: Ib709f47f23f39ca05a695faf86fa3377f11f2dd0

This commit optimizes the tokenization and detokenization operational
flow for speed-up. It makes the coding process about 0.3% faster at
speed 0.

Change-Id: I28008df7482874e4b5f237f2d418ff82a249dd56

This commit makes the encoder skip the redundant tokenization process
in the rate-distortion optimization search loop, while updating the
entropy contexts accordingly. It makes the speed 0 encoding process
about 0.5% faster at no performance change.

Change-Id: I34a4155a0b5332afeb45c93a51c7f35a294d685c

This commit provides special handle on 16x16 inverse 2D-DCT, where
only DC coefficient is quantized to be non-zero value.

Change-Id: I7bf71be7fa13384fab453dc8742b5b50e77a277c

Change-Id: I2a6a646570e2af66315e7c658d00d99f80c4b127

Fixes a warning on MSVS 2012 where the alignment of vp9_default_iscan_8x8
didn't match between its declaration and definition.

Change-Id: I1466a15635f4b22594d705d570b7e399bfb6cf21

Change-Id: I10bf06e3a3d5271221ae6a42a36074d01d493039

Change-Id: I6aa4191935aa93461a07c41b59fdae1eb5f5f107

Change-Id: I5a3e83102784cabb918a5404405fcab99c5bb9b6

This allows us to increment the position at the band-level only as
we go from one band to the next; more importantly, that allows us to
use an add instead of multiply instruction, and omit the instruction
altogether if the band doesn't change from one coef to the next, thus
being slightly faster (probably more noticeable on systems where a
multiply is expensive, like arm).

Change-Id: I4343fe35b9f9a47fa00b217bdcbf5f91ff96c381