Allow FakeNetworkPipe to drop packets in bursts.

webrtc/video/video_loopback.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.
  */
 
@@ skipping 83 matching lines @@
               "If empty, title will be generated automatically.");
 std::string GraphTitle() {
   return static_cast<std::string>(FLAGS_graph_title);
 }
 
 DEFINE_int32(loss_percent, 0, "Percentage of packets randomly lost.");
 int LossPercent() {
   return static_cast<int>(FLAGS_loss_percent);
 }
 
+DEFINE_int32(avg_burst_loss_length, 1, "Average burst length of lost packets.");
+int AvgBurstLossLength() {
+  return static_cast<int>(FLAGS_avg_burst_loss_length);
+}
+
 DEFINE_int32(link_capacity,
              0,
              "Capacity (kbps) of the fake link. 0 means infinite.");
 int LinkCapacityKbps() {
   return static_cast<int>(FLAGS_link_capacity);
 }
 
 DEFINE_int32(queue_size, 0, "Size of the bottleneck link queue in packets.");
 int QueueSize() {
   return static_cast<int>(FLAGS_queue_size);
@@ skipping 80 matching lines @@
               "Name of the clip to show. If empty, using chroma generator.");
 std::string Clip() {
   return static_cast<std::string>(FLAGS_clip);
 }
 
 }  // namespace flags
 
 void Loopback() {
   FakeNetworkPipe::Config pipe_config;
   pipe_config.loss_percent = flags::LossPercent();
+  pipe_config.avg_burst_loss_length = flags::AvgBurstLossLength();
   pipe_config.link_capacity_kbps = flags::LinkCapacityKbps();
   pipe_config.queue_length_packets = flags::QueueSize();
   pipe_config.queue_delay_ms = flags::AvgPropagationDelayMs();
   pipe_config.delay_standard_deviation_ms = flags::StdPropagationDelayMs();
   pipe_config.allow_reordering = flags::FLAGS_allow_reordering;
 
   Call::Config::BitrateConfig call_bitrate_config;
   call_bitrate_config.min_bitrate_bps = flags::MinBitrateKbps() * 1000;
   call_bitrate_config.start_bitrate_bps = flags::StartBitrateKbps() * 1000;
   call_bitrate_config.max_bitrate_bps = flags::MaxBitrateKbps() * 1000;
@@ skipping 34 matching lines @@
 }  // namespace webrtc
 
 int main(int argc, char* argv[]) {
   ::testing::InitGoogleTest(&argc, argv);
   google::ParseCommandLineFlags(&argc, &argv, true);
   webrtc::test::InitFieldTrialsFromString(
       webrtc::flags::FLAGS_force_fieldtrials);
   webrtc::test::RunTest(webrtc::Loopback);
   return 0;
 }