Use SATD based mode decision for block sizes below 16x16

This commit makes the encoder to select between SATD/variance as
metric for mode decision. It also allows to account chroma
component costs for mode decision as well. The overall encoding
time increase as compared to variance based mode selection is about
15% for speed -6. The compression performance is on average 2.2%
better than variance based approach, with about 5% compression
performance gains for hard clips (e.g., jimredvga, nikas720p, and
mmmoving) at lower bit-rate range.

Change-Id: I4d04a31d36f4fcb3f5f491dacd6e7fe44cb9d815

vp9/encoder/vp9_pickmode.c

@@ -639,13 +639,18 @@ static void estimate_block_intra(int plane, int block, BLOCK_SIZE plane_bsize,
                           i, j, 0);
 
   // TODO(jingning): This needs further refactoring.
-  block_yrd(cpi, x, &rate, &dist, &is_skippable, &this_sse, 0,
-            bsize_tx, tx_size);
-  x->skip_txfm[0] = is_skippable;
-  if (is_skippable)
-    rate = vp9_cost_bit(vp9_get_skip_prob(&cpi->common, xd), 1);
-  else
-    rate += vp9_cost_bit(vp9_get_skip_prob(&cpi->common, xd), 0);
+  if (plane_bsize <= BLOCK_16X16) {
+    block_yrd(cpi, x, &rate, &dist, &is_skippable, &this_sse, 0,
+              bsize_tx, tx_size);
+    x->skip_txfm[0] = is_skippable;
+    if (is_skippable)
+      rate = vp9_cost_bit(vp9_get_skip_prob(&cpi->common, xd), 1);
+    else
+      rate += vp9_cost_bit(vp9_get_skip_prob(&cpi->common, xd), 0);
+  } else {
+    unsigned int var_y, sse_y;
+    model_rd_for_sb_y(cpi, bsize_tx, x, xd, &rate, &dist, &var_y, &sse_y);
+  }
 
   p->src.buf = src_buf_base;
   pd->dst.buf = dst_buf_base;
@@ -1064,39 +1069,39 @@ void vp9_pick_inter_mode(VP9_COMP *cpi, MACROBLOCK *x,
               vp9_get_switchable_rate(cpi, xd) : 0;
     }
 
-    // TODO(jingning): disable color operations temporarily.
-    // chroma component rate-distortion cost modeling
-//    if (x->color_sensitivity[0] || x->color_sensitivity[1]) {
-//      int uv_rate = 0;
-//      int64_t uv_dist = 0;
-//      if (x->color_sensitivity[0])
-//        vp9_build_inter_predictors_sbp(xd, mi_row, mi_col, bsize, 1);
-//      if (x->color_sensitivity[1])
-//        vp9_build_inter_predictors_sbp(xd, mi_row, mi_col, bsize, 2);
-//      model_rd_for_sb_uv(cpi, bsize, x, xd, &uv_rate, &uv_dist,
-//                         &var_y, &sse_y);
-//      this_rdc.rate += uv_rate;
-//      this_rdc.dist += uv_dist;
-//    }
-
-    block_yrd(cpi, x, &this_rdc.rate, &this_rdc.dist, &is_skippable, &this_sse,
-              0, bsize, mbmi->tx_size);
-    x->skip_txfm[0] = is_skippable;
-    if (is_skippable) {
-      this_rdc.rate = vp9_cost_bit(vp9_get_skip_prob(cm, xd), 1);
-    } else {
-      if (RDCOST(x->rdmult, x->rddiv, this_rdc.rate, this_rdc.dist) <
-          RDCOST(x->rdmult, x->rddiv, 0, this_sse)) {
-        this_rdc.rate += vp9_cost_bit(vp9_get_skip_prob(cm, xd), 0);
-      } else {
+    if (bsize <= BLOCK_16X16) {
+      block_yrd(cpi, x, &this_rdc.rate, &this_rdc.dist, &is_skippable,
+                &this_sse, 0, bsize, mbmi->tx_size);
+      x->skip_txfm[0] = is_skippable;
+      if (is_skippable) {
         this_rdc.rate = vp9_cost_bit(vp9_get_skip_prob(cm, xd), 1);
-        this_rdc.dist = this_sse;
+      } else {
+        if (RDCOST(x->rdmult, x->rddiv, this_rdc.rate, this_rdc.dist) <
+            RDCOST(x->rdmult, x->rddiv, 0, this_sse)) {
+          this_rdc.rate += vp9_cost_bit(vp9_get_skip_prob(cm, xd), 0);
+        } else {
+          this_rdc.rate = vp9_cost_bit(vp9_get_skip_prob(cm, xd), 1);
+          this_rdc.dist = this_sse;
+        }
+      }
+
+      if (cm->interp_filter == SWITCHABLE) {
+        if ((mbmi->mv[0].as_mv.row | mbmi->mv[0].as_mv.col) & 0x07)
+          this_rdc.rate += vp9_get_switchable_rate(cpi, xd);
       }
     }
 
-    if (cm->interp_filter == SWITCHABLE) {
-      if ((mbmi->mv[0].as_mv.row | mbmi->mv[0].as_mv.col) & 0x07)
-        this_rdc.rate += vp9_get_switchable_rate(cpi, xd);
+    if (x->color_sensitivity[0] || x->color_sensitivity[1]) {
+      int uv_rate = 0;
+      int64_t uv_dist = 0;
+      if (x->color_sensitivity[0])
+        vp9_build_inter_predictors_sbp(xd, mi_row, mi_col, bsize, 1);
+      if (x->color_sensitivity[1])
+        vp9_build_inter_predictors_sbp(xd, mi_row, mi_col, bsize, 2);
+      model_rd_for_sb_uv(cpi, bsize, x, xd, &uv_rate, &uv_dist,
+                         &var_y, &sse_y);
+      this_rdc.rate += uv_rate;
+      this_rdc.dist += uv_dist;
     }
 
     this_rdc.rate += rate_mv;