Experiment for the nack module.

webrtc/video/video_receive_stream.h

 /*
  *  Copyright (c) 2013 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 22 matching lines @@
 class CongestionController;
 class ProcessThread;
 class VoiceEngine;
 class VieRemb;
 
 namespace internal {
 
 class VideoReceiveStream : public webrtc::VideoReceiveStream,
                            public I420FrameCallback,
                            public VideoRenderCallback,
-                           public EncodedImageCallback {
+                           public EncodedImageCallback,
+                           public NackSender,
+                           public KeyFrameRequestSender {

[stefan-webrtc, 2016/03/10 14:20:40]

Is there a point in webrtc::RtpRtcp implementing NackSender if
VideoReceiveStream already does?

[philipel, 2016/03/10 16:39:28]

No, not really, fixed

  public:
   VideoReceiveStream(int num_cpu_cores,
                      CongestionController* congestion_controller,
                      const VideoReceiveStream::Config& config,
                      webrtc::VoiceEngine* voice_engine,
                      ProcessThread* process_thread,
                      CallStats* call_stats,
                      VieRemb* remb);
   ~VideoReceiveStream() override;
 
@@ skipping 18 matching lines @@
 
   // Overrides EncodedImageCallback.
   int32_t Encoded(const EncodedImage& encoded_image,
                   const CodecSpecificInfo* codec_specific_info,
                   const RTPFragmentationHeader* fragmentation) override;
 
   const Config& config() const { return config_; }
 
   void SetSyncChannel(VoiceEngine* voice_engine, int audio_channel_id);
 
+  // NackSender
+  void SendNack(const std::vector<uint16_t>& sequence_numbers) override;
+
+  // KeyFrameRequestSender
+  void RequestKeyFrame() override;
+
  private:
   static bool DecodeThreadFunction(void* ptr);
   void Decode();
 
   TransportAdapter transport_adapter_;
   EncodedFrameCallbackAdapter encoded_frame_proxy_;
   const VideoReceiveStream::Config config_;
   ProcessThread* const process_thread_;
   Clock* const clock_;
 
   rtc::PlatformThread decode_thread_;
 
   CongestionController* const congestion_controller_;
   CallStats* const call_stats_;
   VieRemb* const remb_;
 
   std::unique_ptr<VideoCodingModule> vcm_;
   IncomingVideoStream incoming_video_stream_;
   ReceiveStatisticsProxy stats_proxy_;
   ViEChannel vie_channel_;
   ViEReceiver* const vie_receiver_;
   ViESyncModule vie_sync_;
   RtpRtcp* const rtp_rtcp_;
 };
 }  // namespace internal
 }  // namespace webrtc
 
 #endif  // WEBRTC_VIDEO_VIDEO_RECEIVE_STREAM_H_