Create RtcpDemuxer

webrtc/call/rtp_demuxer.h

Index: webrtc/call/rtp_demuxer.h
diff --git a/webrtc/call/rtp_demuxer.h b/webrtc/call/rtp_demuxer.h
index 6a4370d73163573246b61f2b1179c12af1e2a4f0..c01d500a014bd24a8d91df816a3e0daf016f7a07 100644
--- a/webrtc/call/rtp_demuxer.h
+++ b/webrtc/call/rtp_demuxer.h
@@ -14,6 +14,9 @@
 #include <map>
 #include <set>
 #include <string>
+#include <vector>
+
+#include "webrtc/call/rsid_resolution_observer.h"
 
 namespace webrtc {
 
@@ -41,9 +44,18 @@ class RtpDemuxer {
   // Null pointer is not allowed.
   bool RemoveSink(const RtpPacketSinkInterface* sink);
 
-  // Returns true if at least one matching sink was found, otherwise false.
+  // Returns true if at least one matching sink was found.
   bool OnRtpPacket(const RtpPacketReceived& packet);
 
+  // Allows other objects to be notified when RSID-SSRC associations are
+  // resolved by this object.
+  // Notifications received from outside are *not* propagated. (The ability
+  // to receive such notifications will be added later.)
+  void RegisterRsidResolutionObserver(RsidResolutionObserver* observer);
+
+  // Undo a previous RegisterRsidResolutionObserver().
+  void DeregisterRsidResolutionObserver(const RsidResolutionObserver* observer);
+
  private:
   // Records a sink<->SSRC association. This can happen by explicit
   // configuration by AddSink(ssrc...), or by inferred configuration from an
@@ -51,9 +63,14 @@ class RtpDemuxer {
   // packet reception.
   void RecordSsrcToSinkAssociation(uint32_t ssrc, RtpPacketSinkInterface* sink);
 
-  // When a new packet arrives, we attempt to resolve extra associations,
-  // such as which RSIDs are associated with which SSRCs.
-  void FindSsrcAssociations(const RtpPacketReceived& packet);
+  // When a new packet arrives, we attempt to resolve extra associations.
+  void ResolveAssociations(const RtpPacketReceived& packet);
+
+  // Find the associations of RSID to SSRCs.
+  void ResolveRsidToSsrcAssociations(const RtpPacketReceived& packet);
+
+  // Notify observers of the resolution of an RSID to an SSRC.
+  void NotifyObserversOfRsidResolution(const std::string& rsid, uint32_t ssrc);
 
   // This records the association SSRCs to sinks. Other associations, such
   // as by RSID, also end up here once the RSID, etc., is resolved to an SSRC.
@@ -73,6 +90,10 @@ class RtpDemuxer {
 
   // Avoid an attack that would create excessive logging.
   bool logged_max_processed_ssrcs_exceeded_ = false;
+
+  // Observers which will be notified when an RSID association to an SSRC is
+  // resolved by this object.
+  std::vector<RsidResolutionObserver*> rsid_resolution_observers_;
 };
 
 }  // namespace webrtc