Add a new frame generator that cycles through randomly generated slides.

webrtc/video/screenshare_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 260 matching lines @@
                   flags::TargetBitrateKbps() * 1000,
                   flags::MaxBitrateKbps() * 1000,
                   false,
                   flags::Codec(),
                   flags::NumTemporalLayers(),
                   flags::SelectedTL(),
                   flags::MinTransmitBitrateKbps() * 1000,
                   false,  // ULPFEC disabled.
                   false,  // FlexFEC disabled.
                   ""};
-  params.screenshare = {true, flags::SlideChangeInterval(),
+  params.screenshare = {true, false, flags::SlideChangeInterval(),

[sprang_webrtc, 2017/08/23 12:59:24]

Maybe add command line flag for this?

[erikvarga1, 2017/08/23 14:41:25]

Done.

                         flags::ScrollDuration(), flags::Slides()};
   params.analyzer = {"screenshare", 0.0, 0.0, flags::DurationSecs(),
       flags::OutputFilename(), flags::GraphTitle()};
   params.pipe = pipe_config;
   params.logging = {flags::FLAG_logs, flags::RtcEventLogName(),
                     flags::RtpDumpName(), flags::EncodedFramePath()};
 
   if (flags::NumStreams() > 1 && flags::Stream0().empty() &&
       flags::Stream1().empty()) {
     params.ss.infer_streams = true;
@@ skipping 27 matching lines @@
   }
 
   // InitFieldTrialsFromString needs a reference to an std::string instance,
   // with a scope that outlives the test.
   std::string field_trials = webrtc::flags::FLAG_force_fieldtrials;
   webrtc::test::InitFieldTrialsFromString(field_trials);
 
   webrtc::test::RunTest(webrtc::Loopback);
   return 0;
 }