Reland: Add BWE plot to event log analyzer.

webrtc/test/fuzzers/congestion_controller_feedback_fuzzer.cc

 /*
  *  Copyright (c) 2015 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.
  */
 
 #include "webrtc/call/rtc_event_log.h"
 #include "webrtc/modules/congestion_controller/include/congestion_controller.h"
 #include "webrtc/modules/remote_bitrate_estimator/include/remote_bitrate_estimator.h"
 #include "webrtc/modules/rtp_rtcp/source/byte_io.h"
 
 namespace webrtc {
 
 class NullBitrateObserver : public CongestionController::Observer,
                             public RemoteBitrateObserver {
  public:
   ~NullBitrateObserver() override {}
   void OnNetworkChanged(uint32_t bitrate_bps,
                         uint8_t fraction_loss,
                         int64_t rtt_ms) override {}
   void OnReceiveBitrateChanged(const std::vector<uint32_t>& ssrcs,
                                uint32_t bitrate) override {}
 };
 
-class NullEventLog : public RtcEventLog {
- public:
-  ~NullEventLog() override {}
-  bool StartLogging(const std::string& file_name,
-                    int64_t max_size_bytes) override {
-    return true;
-  }
-  bool StartLogging(rtc::PlatformFile platform_file, int64_t max_size_bytes) {
-    return true;
-  }
-  void StopLogging() override{};
-  void LogVideoReceiveStreamConfig(
-      const webrtc::VideoReceiveStream::Config& config) override {}
-  void LogVideoSendStreamConfig(
-      const webrtc::VideoSendStream::Config& config) override {}
-  void LogRtpHeader(PacketDirection direction,
-                    MediaType media_type,
-                    const uint8_t* header,
-                    size_t packet_length) override {}
-  void LogRtcpPacket(PacketDirection direction,
-                     MediaType media_type,
-                     const uint8_t* packet,
-                     size_t length) override {}
-  void LogAudioPlayout(uint32_t ssrc) override {}
-  void LogBwePacketLossEvent(int32_t bitrate,
-                             uint8_t fraction_loss,
-                             int32_t total_packets) override {}
-};
-
 void FuzzOneInput(const uint8_t* data, size_t size) {
   size_t i = 0;
   if (size < sizeof(int64_t) + sizeof(uint8_t) + sizeof(uint32_t))
     return;
   SimulatedClock clock(data[i++]);
   NullBitrateObserver observer;
-  NullEventLog event_log;
+  RtcEventLogNullImpl event_log;
   CongestionController cc(&clock, &observer, &observer, &event_log);
   RemoteBitrateEstimator* rbe = cc.GetRemoteBitrateEstimator(true);
   RTPHeader header;
   header.ssrc = ByteReader<uint32_t>::ReadBigEndian(&data[i]);
   i += sizeof(uint32_t);
   header.extension.hasTransportSequenceNumber = true;
   int64_t arrival_time_ms =
       std::max<int64_t>(ByteReader<int64_t>::ReadBigEndian(&data[i]), 0);
   i += sizeof(int64_t);
   const size_t kMinPacketSize =
       sizeof(size_t) + sizeof(uint16_t) + sizeof(uint8_t);
   while (i + kMinPacketSize < size) {
     size_t payload_size = ByteReader<size_t>::ReadBigEndian(&data[i]) % 1500;
     i += sizeof(size_t);
     header.extension.transportSequenceNumber =
         ByteReader<uint16_t>::ReadBigEndian(&data[i]);
     i += sizeof(uint16_t);
     rbe->IncomingPacket(arrival_time_ms, payload_size, header);
     clock.AdvanceTimeMilliseconds(5);
     arrival_time_ms += ByteReader<uint8_t>::ReadBigEndian(&data[i]);
     arrival_time_ms += sizeof(uint8_t);
   }
   rbe->Process();
 }
 }  // namespace webrtc