New inter mode context

This change is a fix / extension of the newbestrefmv
experiment. As such it is presented without IFDEF.

The change creates a new context for coding inter modes
in vp9_find_mv_refs(). This replaces the context that
was previously calculated in vp9_find_near_mvs().
The new context is unoptimized and not necessarily
any better at this stage (results pending), but eliminates
the need for a legacy call to vp9_find_near_mvs().
Based on numbers from Scott, this could help decode
speed by several %.

In a later patch I will add support for forward update of
context (assuming this helps) and refine the context as
necessary.

Change-Id: I1cd991b82c8df86cc02237a34185e6d67510698a

1 files changed, 2 insertions, 0 deletions

diff --git a/vp9/common/blockd.h b/vp9/common/blockd.h
index 300c01f96..0cfa9dcff 100644
--- a/vp9/common/blockd.h
+++ b/vp9/common/blockd.h
@@ -231,6 +231,8 @@ typedef struct {
   int_mv mv[2]; // for each reference frame used
   int_mv ref_mvs[MAX_REF_FRAMES][MAX_MV_REFS];
 
+  int mb_mode_context[MAX_REF_FRAMES];
+
   SPLITMV_PARTITIONING_TYPE partitioning;
   unsigned char mb_skip_coeff;                                /* does this mb has coefficients at all, 1=no coefficients, 0=need decode tokens */
   unsigned char need_to_clamp_mvs;