Add fraction loss in visualization tool.

webrtc/tools/event_log_visualizer/analyzer.cc

 /*
  *  Copyright (c) 2016 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 520 matching lines @@
     // Add the data set to the plot.
     plot->series_list_.push_back(std::move(time_series));
   }
 
   plot->SetXAxis(0, call_duration_s_, "Time (s)", kLeftMargin, kRightMargin);
   plot->SetSuggestedYAxis(0, 1, "Latency change (ms)", kBottomMargin,
                           kTopMargin);
   plot->SetTitle("Accumulated network latency change");
 }
 
+// Plot the fraction of packets lost (as perceived by the loss-based BWE).
+void EventLogAnalyzer::CreateFractionLossGraph(Plot* plot) {
+  plot->series_list_.push_back(TimeSeries());
+  for (auto& bwe_update : bwe_loss_updates_) {
+    float x = static_cast<float>(bwe_update.timestamp - begin_time_) / 1000000;
+    float y = static_cast<float>(bwe_update.fraction_loss) / 255 * 100;
+    plot->series_list_.back().points.emplace_back(x, y);
+  }
+  plot->series_list_.back().label = "Fraction lost";
+  plot->series_list_.back().style = LINE_DOT_GRAPH;
+
+  plot->SetXAxis(0, call_duration_s_, "Time (s)", kLeftMargin, kRightMargin);
+  plot->SetSuggestedYAxis(0, 10, "Percent lost packets", kBottomMargin,
+                          kTopMargin);
+  plot->SetTitle("Reported packet loss");
+}
+
 // Plot the total bandwidth used by all RTP streams.
 void EventLogAnalyzer::CreateTotalBitrateGraph(
     PacketDirection desired_direction,
     Plot* plot) {
   struct TimestampSize {
     TimestampSize(uint64_t t, size_t s) : timestamp(t), size(s) {}
     uint64_t timestamp;
     size_t size;
   };
   std::vector<TimestampSize> packets;
@@ skipping 330 matching lines @@
     point.y -= estimated_base_delay_ms;
   // Add the data set to the plot.
   plot->series_list_.push_back(std::move(time_series));
 
   plot->SetXAxis(0, call_duration_s_, "Time (s)", kLeftMargin, kRightMargin);
   plot->SetSuggestedYAxis(0, 10, "Delay (ms)", kBottomMargin, kTopMargin);
   plot->SetTitle("Network Delay Change.");
 }
 }  // namespace plotting
 }  // namespace webrtc