Wire-up BWE feedback for audio receive streams.

webrtc/voice_engine/channel.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 2909 matching lines @@
 void Channel::EnableSendTransportSequenceNumber(int id) {
   int ret =
       SetSendRtpHeaderExtension(true, kRtpExtensionTransportSequenceNumber, id);
   RTC_DCHECK_EQ(0, ret);
 }
 
 void Channel::SetCongestionControlObjects(
     RtpPacketSender* rtp_packet_sender,
     TransportFeedbackObserver* transport_feedback_observer,
     PacketRouter* packet_router) {
-  RTC_DCHECK(feedback_observer_proxy_.get());
-  RTC_DCHECK(seq_num_allocator_proxy_.get());
-  RTC_DCHECK(rtp_packet_sender_proxy_.get());
   RTC_DCHECK(packet_router != nullptr || packet_router_ != nullptr);
-  feedback_observer_proxy_->SetTransportFeedbackObserver(
-      transport_feedback_observer);
-  seq_num_allocator_proxy_->SetSequenceNumberAllocator(packet_router);
-  rtp_packet_sender_proxy_->SetPacketSender(rtp_packet_sender);
+  if (transport_feedback_observer) {
+    RTC_DCHECK(feedback_observer_proxy_.get());
+    feedback_observer_proxy_->SetTransportFeedbackObserver(
+        transport_feedback_observer);
+  }
+  if (rtp_packet_sender) {
+    RTC_DCHECK(rtp_packet_sender_proxy_.get());
+    rtp_packet_sender_proxy_->SetPacketSender(rtp_packet_sender);
+  }
+  if (seq_num_allocator_proxy_.get()) {
+    seq_num_allocator_proxy_->SetSequenceNumberAllocator(packet_router);
+  }
   _rtpRtcpModule->SetStorePacketsStatus(rtp_packet_sender != nullptr, 600);
   if (packet_router != nullptr) {
     packet_router->AddRtpModule(_rtpRtcpModule.get());
   } else {
     packet_router_->RemoveRtpModule(_rtpRtcpModule.get());
   }
   packet_router_ = packet_router;
 }
 
 void Channel::SetRTCPStatus(bool enable) {
@@ skipping 1155 matching lines @@
   int64_t min_rtt = 0;
   if (_rtpRtcpModule->RTT(remoteSSRC, &rtt, &avg_rtt, &min_rtt, &max_rtt)
       != 0) {
     return 0;
   }
   return rtt;
 }
 
 }  // namespace voe
 }  // namespace webrtc