Allow max 1 block per type in RTCP Extended Reports

webrtc/modules/rtp_rtcp/source/rtcp_receiver.cc

 /*
  *  Copyright (c) 2012 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.
  */
 
@@ skipping 668 matching lines @@
 }
 
 void RTCPReceiver::HandleXr(const CommonHeader& rtcp_block,
                             PacketInformation* packet_information) {
   rtcp::ExtendedReports xr;
   if (!xr.Parse(rtcp_block)) {
     ++num_skipped_packets_;
     return;
   }
 
-  for (const rtcp::Rrtr& rrtr : xr.rrtrs())
-    HandleXrReceiveReferenceTime(xr.sender_ssrc(), rrtr);
+  if (xr.rrtr())
+    HandleXrReceiveReferenceTime(xr.sender_ssrc(), *xr.rrtr());
 
-  for (const rtcp::Dlrr& dlrr : xr.dlrrs()) {
-    for (const rtcp::ReceiveTimeInfo& time_info : dlrr.sub_blocks())
-      HandleXrDlrrReportBlock(time_info);
-  }
+  for (const rtcp::ReceiveTimeInfo& time_info : xr.dlrr().sub_blocks())
+    HandleXrDlrrReportBlock(time_info);
 }
 
 void RTCPReceiver::HandleXrReceiveReferenceTime(
     uint32_t sender_ssrc,
     const rtcp::Rrtr& rrtr) {
   remote_time_info_.ssrc = sender_ssrc;
   remote_time_info_.last_rr = CompactNtp(rrtr.ntp());
   last_received_xr_ntp_.SetCurrent(*_clock);
 }
 
@@ skipping 347 matching lines @@
       } else {
         candidates.push_back(it->second.tmmbr_item);
         ++it;
       }
     }
   }
   return candidates;
 }
 
 }  // namespace webrtc