Use 3 rows and cols of pixels for ref_mv scoring

The commit changed to use 3 rows above and 3 cols from left for SAD
scoring for selecting the best reference motion vector. The change
helped std-hd set by >.2% on psnr/ssim metrics.

Change-Id: Ifad3b528d0b4b6e3c22518af789d76eff23c1520

1 files changed, 6 insertions, 7 deletions

diff --git a/vp8/common/findnearmv.c b/vp8/common/findnearmv.c
index 43eb6bf4d..235ca46ce 100644
--- a/vp8/common/findnearmv.c
+++ b/vp8/common/findnearmv.c
@@ -225,10 +225,10 @@ void vp8_find_best_ref_mvs(MACROBLOCKD *xd,
   best_mv->as_int = nearest->as_int = near->as_int = 0;
   vpx_memset(sorted_mvs, 0, sizeof(sorted_mvs));
 
-  above_src = xd->dst.y_buffer - xd->dst.y_stride * 2;
-  left_src  = xd->dst.y_buffer - 2;
-  above_ref = ref_y_buffer - ref_y_stride * 2;
-  left_ref  = ref_y_buffer - 2;
+  above_src = xd->dst.y_buffer - xd->dst.y_stride * 3;
+  left_src  = xd->dst.y_buffer - 3;
+  above_ref = ref_y_buffer - ref_y_stride * 3;
+  left_ref  = ref_y_buffer - 3;
 
   //for(i = 0; i < MAX_MV_REFS; ++i) {
   // Limit search to the predicted best 4
@@ -259,10 +259,10 @@ void vp8_find_best_ref_mvs(MACROBLOCKD *xd,
       ((this_mv.as_mv.col + 3) >> 3):((this_mv.as_mv.col + 4) >> 3);
     offset = ref_y_stride * row_offset + col_offset;
 
-    sad = vp8_sad16x2_c(above_src, xd->dst.y_stride,
+    sad = vp8_sad16x3_c(above_src, xd->dst.y_stride,
                         above_ref + offset, ref_y_stride, INT_MAX);
 
-    sad += vp8_sad2x16_c(left_src, xd->dst.y_stride,
+    sad += vp8_sad3x16_c(left_src, xd->dst.y_stride,
                          left_ref + offset, ref_y_stride, INT_MAX);
 
     // Add the entry to our list and then resort the list on score.
@@ -281,7 +281,6 @@ void vp8_find_best_ref_mvs(MACROBLOCKD *xd,
     }
   }
 
-
   // Set the best mv to the first entry in the sorted list
   best_mv->as_int = sorted_mvs[0].as_int;