From: Yaowu Xu <yaowu@google.com>
Date: Mon, 6 Aug 2012 17:51:20 +0000 (-0700)
Subject: Changed to use reference mv as nearest mv
X-Git-Tag: v1.3.0~1217^2~307^2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e52e8b70250b0f897e6947b5c24db365e489ba07;p=platform%2Fupstream%2Flibvpx.git

Changed to use reference mv as nearest mv

The reference motion vector selected by surrounding pixels that has
the best matching score is used as nearest motion vector.

The change has shown consistent gain on all test sets, compression
gains range from .2% to .6%. The variation is largely dependent on
various other experiments on or off.

Change-Id: I5552e1c2f6fc57c3e8818a5ee41ffda89af05e75
---

diff --git a/vp8/common/findnearmv.c b/vp8/common/findnearmv.c
index 1087ee4..05789af 100644
--- a/vp8/common/findnearmv.c
+++ b/vp8/common/findnearmv.c
@@ -202,7 +202,9 @@ vp8_prob *vp8_mv_ref_probs(VP8_COMMON *pc,
 void vp8_find_best_ref_mvs(MACROBLOCKD *xd,
                            unsigned char *ref_y_buffer,
                            int ref_y_stride,
-                           int_mv *best_mv){
+                           int_mv *best_mv,
+                           int_mv *nearest,
+                           int_mv *near) {
   int_mv *ref_mv = xd->ref_mv;
   int bestsad = INT_MAX;
   int i;
@@ -259,6 +261,13 @@ void vp8_find_best_ref_mvs(MACROBLOCKD *xd,
     lower_mv_precision(best_mv);
 
   vp8_clamp_mv2(best_mv, xd);
+
+  if (best_mv->as_int != 0 &&
+      (best_mv->as_mv.row >> 3) != (nearest->as_mv.row >>3 ) &&
+      (best_mv->as_mv.col >> 3) != (nearest->as_mv.col >>3 )) {
+    near->as_int = nearest->as_int;
+    nearest->as_int = best_mv->as_int;
+  }
 }
 
 #endif
diff --git a/vp8/decoder/decodemv.c b/vp8/decoder/decodemv.c
index f8cf837..f8efd41 100644
--- a/vp8/decoder/decodemv.c
+++ b/vp8/decoder/decodemv.c
@@ -653,7 +653,7 @@ static void read_mb_modes_mv(VP8D_COMP *pbi, MODE_INFO *mi, MB_MODE_INFO *mbmi,
       vp8_find_best_ref_mvs(xd,
                             xd->pre.y_buffer,
                             recon_y_stride,
-                            &best_mv);
+                            &best_mv, &nearest, &nearby);
     }
 #endif
 
@@ -732,7 +732,9 @@ static void read_mb_modes_mv(VP8D_COMP *pbi, MODE_INFO *mi, MB_MODE_INFO *mbmi,
         vp8_find_best_ref_mvs(xd,
                               xd->second_pre.y_buffer,
                               recon_y_stride,
-                              &best_mv_second);
+                              &best_mv_second,
+                              &nearest_second,
+                              &nearby_second);
       }
 #else
       vp8_find_near_mvs(xd, mi, prev_mi,
diff --git a/vp8/encoder/rdopt.c b/vp8/encoder/rdopt.c
index 4689550..df5fa2e 100644
--- a/vp8/encoder/rdopt.c
+++ b/vp8/encoder/rdopt.c
@@ -2652,7 +2652,10 @@ void setup_buffer_inter(VP8_COMP *cpi, MACROBLOCK *x, int idx, int frame_type,
   v_buffer[frame_type] = yv12->v_buffer + recon_uvoffset;
 #if CONFIG_NEWBESTREFMV
   vp8_find_best_ref_mvs(&x->e_mbd, y_buffer[frame_type],
-                        yv12->y_stride, &frame_best_ref_mv[frame_type]);
+                        yv12->y_stride,
+                        &frame_best_ref_mv[frame_type],
+                        &frame_nearest_mv[frame_type],
+                        &frame_near_mv[frame_type]);
   ref_mv[frame_type].as_int = frame_best_ref_mv[frame_type].as_int;
 #endif
 }
diff --git a/vp8/encoder/tokenize.c b/vp8/encoder/tokenize.c
index a8b6436..9b848f3 100644
--- a/vp8/encoder/tokenize.c
+++ b/vp8/encoder/tokenize.c
@@ -1311,6 +1311,7 @@ void vp8_stuff_mb_8x8(VP8_COMP *cpi,
   ENTROPY_CONTEXT *L = (ENTROPY_CONTEXT *)x->left_context;
   int plane_type;
   int b;
+  TOKENEXTRA *t_backup = *t;
 
   stuff2nd_order_b_8x8(x->block + 24, t, 1, x->frame_type,
                        A + vp8_block2above_8x8[24],
@@ -1334,6 +1335,8 @@ void vp8_stuff_mb_8x8(VP8_COMP *cpi,
     *(A + vp8_block2above_8x8[b] + 1) = *(A + vp8_block2above_8x8[b]);
     *(L + vp8_block2left_8x8[b] + 1) = *(L + vp8_block2left_8x8[b]);
   }
+  if (dry_run)
+    *t = t_backup;
 }
 
 
@@ -1370,6 +1373,7 @@ void vp8_stuff_mb_16x16(VP8_COMP *cpi,
   ENTROPY_CONTEXT * A = (ENTROPY_CONTEXT *)x->above_context;
   ENTROPY_CONTEXT * L = (ENTROPY_CONTEXT *)x->left_context;
   int b, i;
+  TOKENEXTRA *t_backup = *t;
 
   stuff1st_order_b_16x16(x->block, t, x->frame_type, A, L, cpi, dry_run);
   for (i = 1; i < 16; i++) {
@@ -1386,6 +1390,8 @@ void vp8_stuff_mb_16x16(VP8_COMP *cpi,
   }
   vpx_memset(&A[8], 0, sizeof(A[8]));
   vpx_memset(&L[8], 0, sizeof(L[8]));
+  if (dry_run)
+    *t = t_backup;
 }
 #endif
 
@@ -1456,7 +1462,8 @@ void stuff1st_order_buv
   *a = *l = pt;
 }
 
-void vp8_stuff_mb(VP8_COMP *cpi, MACROBLOCKD *x, TOKENEXTRA **t, int dry_run) {
+void vp8_stuff_mb(VP8_COMP *cpi, MACROBLOCKD *x,
+                  TOKENEXTRA **t, int dry_run) {
   ENTROPY_CONTEXT *A = (ENTROPY_CONTEXT *)x->above_context;
   ENTROPY_CONTEXT *L = (ENTROPY_CONTEXT *)x->left_context;
   int plane_type;