Remove candidates when doing continual gathering

webrtc/api/jsepsessiondescription.cc

 /*
  *  Copyright 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 119 matching lines @@
                            static_cast<int>(mediasection_index),
                            updated_candidate));
   if (!candidate_collection_[mediasection_index].HasCandidate(
           updated_candidate_wrapper.get()))
     candidate_collection_[mediasection_index].add(
         updated_candidate_wrapper.release());
 
   return true;
 }
 
+int JsepSessionDescription::RemoveCandidate(
+    const IceCandidateInterface* candidate) {
+  if (!candidate || candidate->sdp_mline_index() < 0) {
+    return 0;
+  }
+  size_t mediasection_index = 0;
+  if (!GetMediasectionIndex(candidate, &mediasection_index) ||
+      mediasection_index >= number_of_mediasections()) {
+    return 0;
+  }
+  return candidate_collection_[mediasection_index].remove(candidate);
+}
+
+int JsepSessionDescription::RemoveCandidates(
+    const std::vector<IceCandidateInterfaceRefPtr>& candidates) {
+  int num_removed = 0;
+  for (auto candidate : candidates) {
+    num_removed += RemoveCandidate(candidate.get());
+  }
+  return num_removed;
+}
+
 size_t JsepSessionDescription::number_of_mediasections() const {
   if (!description_)
     return 0;
   return description_->contents().size();
 }
 
 const IceCandidateCollection* JsepSessionDescription::candidates(
     size_t mediasection_index) const {
   if (mediasection_index >= candidate_collection_.size())
     return NULL;
@@ skipping 28 matching lines @@
     if (!found) {
       // If the sdp_mid is presented but we can't find a match, we consider
       // this as an error.
       return false;
     }
   }
   return true;
 }
 
 }  // namespace webrtc