Protected streams report RTP messages directly to the FlexFec streams

webrtc/call/secondary_rtp_sinks_container.h

+/*
+ *  Copyright (c) 2017 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.
+ */
+#ifndef WEBRTC_CALL_SECONDARY_RTP_SINKS_CONTAINER_H_
+#define WEBRTC_CALL_SECONDARY_RTP_SINKS_CONTAINER_H_
+
+namespace webrtc {
+
+class RtpPacketSinkInterface;
+
+// TODO(eladalon): !!! Find a better name?
+
+// By inheriting this class, a subclass of RtpPacketSinkInterface may provide
+// secondary sinks the ability to register with it, receiving OnRtpPacket()
+// called for them too over packets which get routed to the primary sink.
+// One usage for this is FlexFEC, which needs to see the packets of the
+// streams which it protects.
+class SecondaryRtpSinksContainer {
+ public:
+  virtual ~SecondaryRtpSinksContainer() = default;
+
+  virtual void AddSecondarySink(RtpPacketSinkInterface* sink) = 0;
+  virtual void RemoveSecondarySink(const RtpPacketSinkInterface* sink) = 0;
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_CALL_SECONDARY_RTP_SINKS_CONTAINER_H_