commit d7b54cac6a02c3d9f0e723dad89a140e74c8ef61
author Jingning Han <jingning@google.com> Wed Jan 17 10:58:24 2018 -0800
committer Jingning Han <jingning@google.com> Thu Jan 18 16:05:44 2018 +0000
tree 849e1d90c2ea9c40b1acdf9b17808d86c4b0208d
parent 083e842cbdaaad825343675d40c41835b32aba82

Use single context model for mv diff

Reduce the context model size from 3 sets to 1 set for motion
vector difference coding in opt-ref-mv.

Change-Id: Iece1e01bb44f6a445c13787aa948400b8feef118

av1/common/mvref_common.h

diff --git a/av1/common/mvref_common.h b/av1/common/mvref_common.h
index 68ab0d5..c00daf2 100644
--- a/av1/common/mvref_common.h
+++ b/av1/common/mvref_common.h
@@ -270,6 +270,10 @@
 static INLINE int av1_nmv_ctx(const uint8_t ref_mv_count,
                               const CANDIDATE_MV *ref_mv_stack, int ref,
                               int ref_mv_idx) {
+#if CONFIG_OPT_REF_MV
+  return 0;
+#endif
+
   if (ref_mv_idx < ref_mv_count &&
       ref_mv_stack[ref_mv_idx].weight >= REF_CAT_LEVEL)
     return ref_mv_stack[ref_mv_idx].pred_diff[ref];