Allow packets to be reordered in the fake network pipe.

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 158 matching lines @@
               "",
               "Comma separated values describing SpatialLayer for layer #1.");
 std::string SL1() {
   return static_cast<std::string>(FLAGS_sl1);
 }
 
 DEFINE_bool(logs, false, "print logs to stderr");
 
 DEFINE_bool(send_side_bwe, true, "Use send-side bandwidth estimation");
 
+DEFINE_bool(allow_reordering, false, "Allow packet reordering to occur");
+
 DEFINE_string(
     force_fieldtrials,
     "",
     "Field trials control experimental feature code which can be forced. "
     "E.g. running with --force_fieldtrials=WebRTC-FooFeature/Enable/"
     " will assign the group Enable to field trial WebRTC-FooFeature. Multiple "
     "trials are separated by \"/\"");
 
 // Video-specific flags.
 DEFINE_string(clip,
               "",
               "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.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;
 
   VideoQualityTest::Params params{
       {flags::Width(), flags::Height(), flags::Fps(),
        flags::MinBitrateKbps() * 1000, flags::TargetBitrateKbps() * 1000,
        flags::MaxBitrateKbps() * 1000, flags::Codec(),
@@ skipping 27 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;
 }