Exclude distance-weighted prediction for ext-skip

For ext-skip, the use of distance-weighted prediction has only shown
a coding gain in the AMCY low delay scenario. It is hence not being
considered and compound-average is used exlusively.

Change-Id: I57439eda1246e179d6404bbec366c6c610af3a36
diff --git a/av1/encoder/bitstream.c b/av1/encoder/bitstream.c
index ed809ed..8847101 100644
--- a/av1/encoder/bitstream.c
+++ b/av1/encoder/bitstream.c
@@ -1386,21 +1386,7 @@
   }
 
 #if CONFIG_EXT_SKIP
-  if (mbmi->skip_mode) {
-#if CONFIG_JNT_COMP && SKIP_MODE_WITH_JNT_COMP
-    const int cur_offset = (int)cm->frame_offset;
-    int ref_offset[2];
-    get_skip_mode_ref_offsets(cm, ref_offset);
-    const int cur_to_ref0 = cur_offset - ref_offset[0];
-    const int cur_to_ref1 = abs(cur_offset - ref_offset[1]);
-    if (cur_to_ref0 != cur_to_ref1 && xd->all_one_sided_refs) {
-      const int comp_index_ctx = get_comp_index_context(cm, xd);
-      aom_write_symbol(w, mbmi->compound_idx,
-                       ec_ctx->compound_index_cdf[comp_index_ctx], 2);
-    }
-#endif  // CONFIG_JNT_COMP && SKIP_MODE_WITH_JNT_COMP
-    return;
-  }
+  if (mbmi->skip_mode) return;
 #endif  // CONFIG_EXT_SKIP
 
   if (!is_inter) {
diff --git a/av1/encoder/encodeframe.c b/av1/encoder/encodeframe.c
index 1253882..3753ea9 100644
--- a/av1/encoder/encodeframe.c
+++ b/av1/encoder/encodeframe.c
@@ -869,22 +869,7 @@
         assert(has_second_ref(mbmi));
         rdc->compound_ref_used_flag = 1;
       }
-#if CONFIG_JNT_COMP && SKIP_MODE_WITH_JNT_COMP
-      const int cur_offset = (int)cm->frame_offset;
-      int ref_offset[2];
-      get_skip_mode_ref_offsets(cm, ref_offset);
-      const int cur_to_ref0 = cur_offset - ref_offset[0];
-      const int cur_to_ref1 = abs(cur_offset - ref_offset[1]);
-      if (cur_to_ref0 != cur_to_ref1 && xd->all_one_sided_refs) {
-        const int comp_index_ctx = get_comp_index_context(cm, xd);
-        ++counts->compound_index[comp_index_ctx][mbmi->compound_idx];
-        if (allow_update_cdf)
-          update_cdf(fc->compound_index_cdf[comp_index_ctx], mbmi->compound_idx,
-                     2);
-      }
-#endif  // CONFIG_JNT_COMP && SKIP_MODE_WITH_JNT_COMP
       set_ref_ptrs(cm, xd, mbmi->ref_frame[0], mbmi->ref_frame[1]);
-
       return;
     }
 #endif  // CONFIG_EXT_SKIP
diff --git a/av1/encoder/rdopt.c b/av1/encoder/rdopt.c
index c6c4275..9bce3bf 100644
--- a/av1/encoder/rdopt.c
+++ b/av1/encoder/rdopt.c
@@ -10641,56 +10641,9 @@
 // Obtain the rdcost for skip_mode.
 #if CONFIG_JNT_COMP
     x->compound_idx = 1;  // COMPOUND_AVERAGE
-#if SKIP_MODE_WITH_JNT_COMP
-    const int cur_offset = (int)cm->frame_offset;
-    int ref_offset[2];
-    get_skip_mode_ref_offsets(cm, ref_offset);
-    const int cur_to_ref0 = cur_offset - ref_offset[0];
-    const int cur_to_ref1 = abs(cur_offset - ref_offset[0]);
-    if (cur_to_ref0 != cur_to_ref1 && xd->all_one_sided_refs) {
-      // Decide on the JNT_COMP mode.
-      int64_t best_skip_mode_rd = INT64_MAX;
-      int best_compound_idx = 0;
-      int best_skip_mode_rate = 0;
-      int64_t best_skip_mode_sse = 0, best_skip_mode_dist = 0;
-
-      for (int compound_idx = 0; compound_idx < 2; ++compound_idx) {
-        x->compound_idx = compound_idx;
-        estimate_skip_mode_rdcost(cpi, tile_data, x, bsize, mi_row, mi_col,
-                                  frame_mv, yv12_mb);
-
-        if (x->skip_mode_rdcost >= 0 && x->skip_mode_rdcost < INT64_MAX) {
-          // Update skip mode rdcost.
-          const int comp_index_ctx = get_comp_index_context(cm, xd);
-          x->skip_mode_rate += x->comp_idx_cost[comp_index_ctx][compound_idx];
-          x->skip_mode_rdcost =
-              RDCOST(x->rdmult, x->skip_mode_rate, x->skip_mode_dist);
-
-          if (x->skip_mode_rdcost < best_skip_mode_rd) {
-            best_skip_mode_rd = x->skip_mode_rdcost;
-            best_compound_idx = compound_idx;
-            best_skip_mode_rate = x->skip_mode_rate;
-            best_skip_mode_sse = x->skip_mode_sse;
-            best_skip_mode_dist = x->skip_mode_dist;
-          }
-        }
-      }
-
-      if (best_skip_mode_rd < INT64_MAX) {
-        x->compound_idx = best_compound_idx;
-        x->skip_mode_rdcost = best_skip_mode_rd;
-        x->skip_mode_rate = best_skip_mode_rate;
-        x->skip_mode_sse = best_skip_mode_sse;
-        x->skip_mode_dist = best_skip_mode_dist;
-      }
-    } else {
-#endif  // SKIP_MODE_WITH_JNT_COMP
-#endif  // CONFIG_JNT_COMP
-      estimate_skip_mode_rdcost(cpi, tile_data, x, bsize, mi_row, mi_col,
-                                frame_mv, yv12_mb);
-#if CONFIG_JNT_COMP && SKIP_MODE_WITH_JNT_COMP
-    }
-#endif  // CONFIG_JNT_COMP && SKIP_MODE_WITH_JNT_COMP
+#endif                    // CONFIG_JNT_COMP
+    estimate_skip_mode_rdcost(cpi, tile_data, x, bsize, mi_row, mi_col,
+                              frame_mv, yv12_mb);
 
     if (x->skip_mode_rdcost >= 0 && x->skip_mode_rdcost < INT64_MAX) {
       // Update skip mode rdcost.