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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

--- a/vp8/common/findnearmv.c

+++ b/vp8/common/findnearmv.c

@@ -225,10 +225,10 @@

   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 @@

       ((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.

@@ -280,7 +280,6 @@

         break;

     }

   }

-

   // Set the best mv to the first entry in the sorted list

   best_mv->as_int = sorted_mvs[0].as_int;

--- a/vp8/encoder/sad_c.c

+++ b/vp8/encoder/sad_c.c

@@ -98,21 +98,21 @@

 }

 #if CONFIG_NEWBESTREFMV

-unsigned int vp8_sad2x16_c(

+unsigned int vp8_sad3x16_c(

   const unsigned char *src_ptr,

   int  src_stride,

   const unsigned char *ref_ptr,

   int  ref_stride,

   int max_sad){

-  return sad_mx_n_c(src_ptr, src_stride, ref_ptr, ref_stride, 2, 16);

+  return sad_mx_n_c(src_ptr, src_stride, ref_ptr, ref_stride, 3, 16);

 }

-unsigned int vp8_sad16x2_c(

+unsigned int vp8_sad16x3_c(

   const unsigned char *src_ptr,

   int  src_stride,

   const unsigned char *ref_ptr,

   int  ref_stride,

   int max_sad){

-  return sad_mx_n_c(src_ptr, src_stride, ref_ptr, ref_stride, 16, 2);

+  return sad_mx_n_c(src_ptr, src_stride, ref_ptr, ref_stride, 16, 3);

 }

 #endif

-- 

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