Support REMB in combination with send-side BWE.

webrtc/modules/bitrate_controller/bitrate_controller_impl.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 125 matching lines @@
 
 void BitrateControllerImpl::OnReceivedEstimatedBitrate(uint32_t bitrate) {
   {
     rtc::CritScope cs(&critsect_);
     bandwidth_estimation_.UpdateReceiverEstimate(clock_->TimeInMilliseconds(),
                                                  bitrate);
   }
   MaybeTriggerOnNetworkChanged();
 }
 
+void BitrateControllerImpl::UpdateDelayBasedEstimate(uint32_t bitrate_bps) {
+  {
+    rtc::CritScope cs(&critsect_);
+    bandwidth_estimation_.UpdateDelayBasedEstimate(clock_->TimeInMilliseconds(),
+                                                   bitrate_bps);
+  }
+  MaybeTriggerOnNetworkChanged();
+}
+
 int64_t BitrateControllerImpl::TimeUntilNextProcess() {
   const int64_t kBitrateControllerUpdateIntervalMs = 25;
   rtc::CritScope cs(&critsect_);
   int64_t time_since_update_ms =
       clock_->TimeInMilliseconds() - last_bitrate_update_ms_;
   return std::max<int64_t>(
       kBitrateControllerUpdateIntervalMs - time_since_update_ms, 0);
 }
 
 int32_t BitrateControllerImpl::Process() {
@@ skipping 61 matching lines @@
   bandwidth_estimation_.CurrentEstimate(&bitrate, &fraction_loss, &rtt);
   if (bitrate > 0) {
     bitrate = bitrate - std::min<int>(bitrate, reserved_bitrate_bps_);
     bitrate = std::max(bitrate, bandwidth_estimation_.GetMinBitrate());
     *bandwidth = bitrate;
     return true;
   }
   return false;
 }
 }  // namespace webrtc