Selectable number of TL screenshare loopback test

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 55 matching lines @@
 DEFINE_int32(tl0_bitrate, 200, "Temporal layer 0 target bitrate.");
 size_t StartBitrate() {
   return static_cast<size_t>(FLAGS_tl0_bitrate);
 }
 
 DEFINE_int32(tl1_bitrate, 2000, "Temporal layer 1 target bitrate.");
 size_t MaxBitrate() {
   return static_cast<size_t>(FLAGS_tl1_bitrate);
 }
 
+DEFINE_int32(num_temporal_layers, 2, "Number of temporal layers to use.");
+int NumTemporalLayers() {
+  return static_cast<int>(FLAGS_num_temporal_layers);
+}
+
 DEFINE_int32(min_transmit_bitrate, 400, "Min transmit bitrate incl. padding.");
 int MinTransmitBitrate() {
   return FLAGS_min_transmit_bitrate;
 }
 
 DEFINE_string(codec, "VP8", "Video codec to use.");
 std::string Codec() {
   return static_cast<std::string>(FLAGS_codec);
 }
 
@@ skipping 35 matching lines @@
     "",
     "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 \"/\"");
 }  // namespace flags
 
 class ScreenshareLoopback : public test::Loopback {
  public:
   explicit ScreenshareLoopback(const Config& config) : Loopback(config) {
+    CHECK_GE(config.num_temporal_layers, 1u);
+    CHECK_LE(config.num_temporal_layers, 2u);
+
     vp8_settings_ = VideoEncoder::GetDefaultVp8Settings();
     vp8_settings_.denoisingOn = false;
     vp8_settings_.frameDroppingOn = false;
-    vp8_settings_.numberOfTemporalLayers = 2;
+    vp8_settings_.numberOfTemporalLayers =
+        static_cast<unsigned char>(config.num_temporal_layers);
 
     vp9_settings_ = VideoEncoder::GetDefaultVp9Settings();
     vp9_settings_.denoisingOn = false;
     vp9_settings_.frameDroppingOn = false;
-    vp9_settings_.numberOfTemporalLayers = 2;
+    vp9_settings_.numberOfTemporalLayers =
+        static_cast<unsigned char>(config.num_temporal_layers);
   }
   virtual ~ScreenshareLoopback() {}
 
  protected:
   VideoEncoderConfig CreateEncoderConfig() override {
     VideoEncoderConfig encoder_config(test::Loopback::CreateEncoderConfig());
     VideoStream* stream = &encoder_config.streams[0];
     encoder_config.content_type = VideoEncoderConfig::ContentType::kScreen;
     encoder_config.min_transmit_bitrate_bps = flags::MinTransmitBitrate();
+    int num_temporal_layers;
     if (config_.codec == "VP8") {
       encoder_config.encoder_specific_settings = &vp8_settings_;
+      num_temporal_layers = vp8_settings_.numberOfTemporalLayers;
     } else if (config_.codec == "VP9") {
       encoder_config.encoder_specific_settings = &vp9_settings_;
+      num_temporal_layers = vp9_settings_.numberOfTemporalLayers;
     } else {
       RTC_NOTREACHED() << "Codec not supported!";
       abort();
     }
     stream->temporal_layer_thresholds_bps.clear();
     stream->target_bitrate_bps =
         static_cast<int>(config_.start_bitrate_kbps) * 1000;
-    stream->temporal_layer_thresholds_bps.push_back(stream->target_bitrate_bps);
+    if (num_temporal_layers == 2) {
+      stream->temporal_layer_thresholds_bps.push_back(
+          stream->target_bitrate_bps);
+    }
     return encoder_config;
   }
 
   test::VideoCapturer* CreateCapturer(VideoSendStream* send_stream) override {
     std::vector<std::string> slides;
     slides.push_back(test::ResourcePath("web_screenshot_1850_1110", "yuv"));
     slides.push_back(test::ResourcePath("presentation_1850_1110", "yuv"));
     slides.push_back(test::ResourcePath("photo_1850_1110", "yuv"));
     slides.push_back(test::ResourcePath("difficult_photo_1850_1110", "yuv"));
 
@@ skipping 24 matching lines @@
 
 void Loopback() {
   test::Loopback::Config config{flags::Width(),
                                 flags::Height(),
                                 flags::Fps(),
                                 flags::MinBitrate(),
                                 flags::StartBitrate(),
                                 flags::MaxBitrate(),
                                 flags::MinTransmitBitrate(),
                                 flags::Codec(),
-                                0,  // Default number of temporal layers.
+                                flags::NumTemporalLayers(),
                                 flags::LossPercent(),
                                 flags::LinkCapacity(),
                                 flags::QueueSize(),
                                 flags::AvgPropagationDelayMs(),
                                 flags::StdPropagationDelayMs(),
                                 flags::FLAGS_logs};
   ScreenshareLoopback loopback(config);
   loopback.Run();
 }
 }  // 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;
 }