Protected streams report RTP messages directly to the FlexFec streams

webrtc/video_receive_stream.h

Index: webrtc/video_receive_stream.h
diff --git a/webrtc/video_receive_stream.h b/webrtc/video_receive_stream.h
index 863cb2e088267b8dfabfb1fd98b187501c1faf02..48d16a8ea1b7f883d8652deceb694512c0946cfa 100644
--- a/webrtc/video_receive_stream.h
+++ b/webrtc/video_receive_stream.h
@@ -25,6 +25,7 @@
 
 namespace webrtc {
 
+class RtpPacketSinkInterface;
 class VideoDecoder;
 
 class VideoReceiveStream {
@@ -221,6 +222,13 @@ class VideoReceiveStream {
     EnableEncodedFrameRecording(rtc::kInvalidPlatformFileValue, 0);
   }
 
+  // RtpDemuxer only forwards a given RTP packet to one sink. However, some
+  // sinks, such as FlexFEC, might wish to be informed of all of the packets
+  // a given sink receives (or any set of sinks). They may do so by registering
+  // themselves as secondary sinks.
+  virtual void AddSecondarySink(RtpPacketSinkInterface* sink) = 0;
+  virtual void RemoveSecondarySink(const RtpPacketSinkInterface* sink) = 0;
+
  protected:
   virtual ~VideoReceiveStream() {}
 };