H.264 video codec support using OpenH264/FFmpeg

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 145 matching lines @@
   explicit ScreenshareLoopback(const Config& config) : Loopback(config) {
     CHECK_GE(config.num_temporal_layers, 1u);
     CHECK_LE(config.num_temporal_layers, 2u);
     CHECK_GE(config.num_spatial_layers, 1u);
     CHECK_LE(config.num_spatial_layers, 5u);
     CHECK(config.num_spatial_layers == 1 || config.codec == "VP9");
     CHECK(config.num_spatial_layers == 1 || config.num_temporal_layers == 1);
     CHECK_LT(config.tl_discard_threshold, config.num_temporal_layers);
     CHECK_LT(config.sl_discard_threshold, config.num_spatial_layers);
 
+    h264_settings_ = VideoEncoder::GetDefaultH264Settings();
+    h264_settings_.frameDroppingOn = false;
+
     vp8_settings_ = VideoEncoder::GetDefaultVp8Settings();
     vp8_settings_.denoisingOn = false;
     vp8_settings_.frameDroppingOn = false;
     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 =
         static_cast<unsigned char>(config.num_temporal_layers);
     vp9_settings_.numberOfSpatialLayers =
         static_cast<unsigned char>(config.num_spatial_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") {
+    if (config_.codec == "H264") {
+      encoder_config.encoder_specific_settings = &h264_settings_;
+      num_temporal_layers = 1;
+    } else 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();
@@ skipping 27 matching lines @@
         test::FrameGenerator::CreateScrollingInputFromYuvFiles(
             Clock::GetRealTimeClock(), slides, kWidth, kHeight, flags::Width(),
             flags::Height(), flags::ScrollDuration() * 1000, kPauseDurationMs);
 
     test::FrameGeneratorCapturer* capturer(new test::FrameGeneratorCapturer(
         clock_, send_stream->Input(), frame_generator, flags::Fps()));
     EXPECT_TRUE(capturer->Init());
     return capturer;
   }
 
+  VideoCodecH264 h264_settings_;
   VideoCodecVP8 vp8_settings_;
   VideoCodecVP9 vp9_settings_;
 };
 
 void Loopback() {
   test::Loopback::Config config{flags::Width(),
                                 flags::Height(),
                                 flags::Fps(),
                                 flags::MinBitrate(),
                                 flags::StartBitrate(),
@@ skipping 16 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;
 }