Measure packet loss so we can use it to select ICE candidate pairs.

webrtc/p2p/base/port.h

 /*
  *  Copyright 2004 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.
  */
 
 #ifndef WEBRTC_P2P_BASE_PORT_H_
 #define WEBRTC_P2P_BASE_PORT_H_
 
 #include <map>
 #include <memory>
 #include <set>
 #include <string>
 #include <vector>
 
-#include "webrtc/p2p/base/candidate.h"
-#include "webrtc/p2p/base/candidatepairinterface.h"
-#include "webrtc/p2p/base/jseptransport.h"
-#include "webrtc/p2p/base/packetsocketfactory.h"
-#include "webrtc/p2p/base/portinterface.h"
-#include "webrtc/p2p/base/stun.h"
-#include "webrtc/p2p/base/stunrequest.h"
 #include "webrtc/base/asyncpacketsocket.h"
 #include "webrtc/base/checks.h"
 #include "webrtc/base/network.h"
 #include "webrtc/base/optional.h"
 #include "webrtc/base/proxyinfo.h"
 #include "webrtc/base/ratetracker.h"
 #include "webrtc/base/sigslot.h"
 #include "webrtc/base/socketaddress.h"
 #include "webrtc/base/thread.h"
+#include "webrtc/p2p/base/candidate.h"
+#include "webrtc/p2p/base/candidatepairinterface.h"
+#include "webrtc/p2p/base/jseptransport.h"
+#include "webrtc/p2p/base/packetlossestimator.h"
+#include "webrtc/p2p/base/packetsocketfactory.h"
+#include "webrtc/p2p/base/portinterface.h"
+#include "webrtc/p2p/base/stun.h"
+#include "webrtc/p2p/base/stunrequest.h"
 
 namespace cricket {
 
 class Connection;
 class ConnectionRequest;
 
 extern const char LOCAL_PORT_TYPE[];
 extern const char STUN_PORT_TYPE[];
 extern const char PRFLX_PORT_TYPE[];
 extern const char RELAY_PORT_TYPE[];
@@ skipping 666 matching lines @@
   // https://w3c.github.io/webrtc-stats/#dom-rtcicecandidatepairstats-currentroundtriptime
   rtc::Optional<uint32_t> current_round_trip_time_ms_;
   int64_t last_ping_sent_;      // last time we sent a ping to the other side
   int64_t last_ping_received_;  // last time we received a ping from the other
                                 // side
   int64_t last_data_received_;
   int64_t last_ping_response_received_;
   int64_t receiving_unchanged_since_ = 0;
   std::vector<SentPing> pings_since_last_response_;
 
+  PacketLossEstimator packet_loss_estimator_;
+
   bool reported_;
   IceCandidatePairState state_;
   // Time duration to switch from receiving to not receiving.
   int receiving_timeout_;
   int64_t time_created_ms_;
   int num_pings_sent_ = 0;
 
   friend class Port;
   friend class ConnectionRequest;
 };
 
 // ProxyConnection defers all the interesting work to the port.
 class ProxyConnection : public Connection {
  public:
   ProxyConnection(Port* port, size_t index, const Candidate& remote_candidate);
 
   int Send(const void* data,
            size_t size,
            const rtc::PacketOptions& options) override;
   int GetError() override { return error_; }
 
  private:
   int error_ = 0;
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_P2P_BASE_PORT_H_