Refactor: simplify interface of SenderRtcpSession and CastTransport.

media/cast/net/cast_transport.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This is the main interface for the cast transport sender.  It accepts encoded
 // frames (both audio and video), encrypts their encoded data, packetizes them
 // and feeds them into a transport (e.g., UDP).
 
 // Construction of the Cast Sender and the Cast Transport should be done
 // in the following order:
@@ skipping 32 matching lines @@
 }  // namespace net
 
 namespace media {
 namespace cast {
 
 struct RtpReceiverStatistics;
 struct RtcpTimeData;
 
 // Following the initialization of either audio or video an initialization
 // status will be sent via this callback.
-typedef base::Callback<void(CastTransportStatus status)>
-    CastTransportStatusCallback;
+using CastTransportStatusCallback =
+    base::Callback<void(CastTransportStatus status)>;
 
-typedef base::Callback<void(std::unique_ptr<std::vector<FrameEvent>>,
-                            std::unique_ptr<std::vector<PacketEvent>>)>
-    BulkRawEventsCallback;
+using BulkRawEventsCallback =
+    base::Callback<void(std::unique_ptr<std::vector<FrameEvent>>,
+                        std::unique_ptr<std::vector<PacketEvent>>)>;
+
+// Interface to handle received RTCP messages on RTP sender.
+class RtcpObserver {
+ public:
+  virtual ~RtcpObserver() {}
+
+  // Called on receiving cast message from RTP receiver.
+  virtual void OnReceivedCastMessage(const RtcpCastMessage& cast_message) = 0;
+
+  // Called on receiving Rtt message from RTP receiver.
+  virtual void OnReceivedRtt(base::TimeDelta round_trip_time) = 0;
+
+  // Called on receiving PLI from RTP receiver.
+  virtual void OnReceivedPli() = 0;
+
+  // Called on receiving RTP receiver logs.
+  virtual void OnReceivedReceiverLog(const RtcpReceiverLogMessage& log) {}
+};
 
 // The application should only trigger this class from the transport thread.
 class CastTransport : public base::NonThreadSafe {
  public:
   // Interface used for receiving status updates, raw events, and RTP packets
   // from CastTransport.
   class Client {
    public:
     virtual ~Client(){};
 
@@ skipping 17 matching lines @@
       std::unique_ptr<Client> client,
       std::unique_ptr<PacketTransport> transport,
       const scoped_refptr<base::SingleThreadTaskRunner>& transport_task_runner);
 
   virtual ~CastTransport() {}
 
   // Audio/Video initialization.
   // Encoded frames cannot be transmitted until the relevant initialize method
   // is called.
   virtual void InitializeAudio(const CastTransportRtpConfig& config,
-                               const RtcpCastMessageCallback& cast_message_cb,
-                               const RtcpRttCallback& rtt_cb,
-                               const RtcpPliCallback& pli_cb) = 0;
+                               std::unique_ptr<RtcpObserver> rtcp_observer) {}
   virtual void InitializeVideo(const CastTransportRtpConfig& config,
-                               const RtcpCastMessageCallback& cast_message_cb,
-                               const RtcpRttCallback& rtt_cb,
-                               const RtcpPliCallback& pli_cb) = 0;
+                               std::unique_ptr<RtcpObserver> rtcp_observer) {}
 
   // Encrypt, packetize and transmit |frame|. |ssrc| must refer to a
   // a channel already established with InitializeAudio / InitializeVideo.
   virtual void InsertFrame(uint32_t ssrc, const EncodedFrame& frame) = 0;
 
   // Sends a RTCP sender report to the receiver.
   // |ssrc| is the SSRC for this report.
   // |current_time| is the current time reported by a tick clock.
   // |current_time_as_rtp_timestamp| is the corresponding RTP timestamp.
   virtual void SendSenderReport(uint32_t ssrc,
@@ skipping 43 matching lines @@
   virtual void SendRtcpFromRtpReceiver() = 0;
 
   // Set options for the PacedSender and Wifi.
   virtual void SetOptions(const base::DictionaryValue& options) = 0;
 };
 
 }  // namespace cast
 }  // namespace media
 
 #endif  // MEDIA_CAST_NET_CAST_TRANSPORT_H_