Added support for sending and receiving RTCP XR packets:

- Receiver reference time report block
- DLRR report block (RFC3611).

BUG=1613
R=mflodman@webrtc.org, stefan@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/2196010

git-svn-id: http://webrtc.googlecode.com/svn/trunk@4898 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/modules/rtp_rtcp/source/rtcp_receiver.h

@@ -69,6 +69,8 @@ public:
                 uint32_t *RTCPArrivalTimeFrac,
                 uint32_t *rtcp_timestamp) const;
 
+   bool LastReceivedXrReferenceTimeInfo(RtcpReceiveTimeInfo* info) const;
+
     // get rtt
     int32_t RTT(uint32_t remoteSSRC,
                 uint16_t* RTT,
@@ -133,6 +135,21 @@ protected:
 
     void HandleSDESChunk(RTCPUtility::RTCPParserV2& rtcpParser);
 
+    void HandleXrHeader(RTCPUtility::RTCPParserV2& parser,
+                        RTCPHelp::RTCPPacketInformation& rtcpPacketInformation);
+
+    void HandleXrReceiveReferenceTime(
+        RTCPUtility::RTCPParserV2& parser,
+        RTCPHelp::RTCPPacketInformation& rtcpPacketInformation);
+
+    void HandleXrDlrrReportBlock(
+        RTCPUtility::RTCPParserV2& parser,
+        RTCPHelp::RTCPPacketInformation& rtcpPacketInformation);
+
+    void HandleXrDlrrReportBlockItem(
+        const RTCPUtility::RTCPPacket& packet,
+        RTCPHelp::RTCPPacketInformation& rtcpPacketInformation);
+
     void HandleXRVOIPMetric(RTCPUtility::RTCPParserV2& rtcpParser,
                             RTCPHelp::RTCPPacketInformation& rtcpPacketInformation);
 
@@ -223,6 +240,12 @@ protected:
   uint32_t _lastReceivedSRNTPsecs;
   uint32_t _lastReceivedSRNTPfrac;
 
+  // Received XR receive time report.
+  RtcpReceiveTimeInfo _remoteXRReceiveTimeInfo;
+  // Time when the report was received.
+  uint32_t _lastReceivedXRNTPsecs;
+  uint32_t _lastReceivedXRNTPfrac;
+
   // Received report blocks.
   std::map<uint32_t, RTCPHelp::RTCPReportBlockInformation*>
       _receivedReportBlockMap;