commit d37b83d81002c3d0c077194d4841a64b78beaf1e
author Jingning Han <jingning@google.com> Thu Jul 27 14:53:13 2017 -0700
committer Jingning Han <jingning@google.com> Mon Aug 07 22:34:31 2017 +0000
tree 53dc369642ffb5fbdc8748217fb5bf031ca2f3e9
parent 7f99477a7e7096617b7415cd9b4da30af0e29923

Use 4x4 granularity for nearest neighbor mv search

Search the immediate neighbor for reference motion vectors in the
unit of 4x4 block size. This improves the compression performance
by 0.05%.

Change-Id: Iaf04aa2c8986de6fbc22fd56e137c1f0bcb38185

av1/common/mvref_common.c

diff --git a/av1/common/mvref_common.c b/av1/common/mvref_common.c
index b85cbb8..698a367 100644
--- a/av1/common/mvref_common.c
+++ b/av1/common/mvref_common.c
@@ -166,7 +166,7 @@
                             ? mi_size_wide[BLOCK_4X4]
                             : mi_size_wide[BLOCK_8X8];
   // TODO(jingning): Revisit this part after cb4x4 is stable.
-  if (bsize >= BLOCK_8X8 || abs(row_offset) > 1) row_offset *= 2;
+  if (abs(row_offset) > 1) row_offset *= 2;
 
   if (bsize < BLOCK_8X8 && abs(row_offset) > 1) {
     if (mi_row & 0x01) row_offset += 1;
@@ -220,7 +220,7 @@
   const int mi_offset = (bsize < BLOCK_8X8) || (abs(col_offset) > 1)
                             ? mi_size_high[BLOCK_4X4]
                             : mi_size_high[BLOCK_8X8];
-  if (bsize >= BLOCK_8X8 || abs(col_offset) > 1) col_offset *= 2;
+  if (abs(col_offset) > 1) col_offset *= 2;
 
   if (bsize < BLOCK_8X8 && abs(col_offset) > 1) {
     if (mi_row & 0x01) row_offset -= 1;