Implement periodic bandwidth probing in application-limited region.

webrtc/modules/congestion_controller/congestion_controller.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 257 matching lines @@
 
 TransportFeedbackObserver*
 CongestionController::GetTransportFeedbackObserver() {
   return &transport_feedback_adapter_;
 }
 
 RateLimiter* CongestionController::GetRetransmissionRateLimiter() {
   return retransmission_rate_limiter_.get();
 }
 
+void CongestionController::EnablePeriodicProbing(bool enable) {
+  probe_controller_->EnablePeriodicProbing(enable);
+}
+
 void CongestionController::SetAllocatedSendBitrateLimits(
     int min_send_bitrate_bps,
     int max_padding_bitrate_bps) {
   pacer_->SetSendBitrateLimits(min_send_bitrate_bps, max_padding_bitrate_bps);
 }
 
 int64_t CongestionController::GetPacerQueuingDelayMs() const {
   return IsNetworkDown() ? 0 : pacer_->QueueInMs();
 }
 
@@ skipping 24 matching lines @@
 }
 
 int64_t CongestionController::TimeUntilNextProcess() {
   return std::min(bitrate_controller_->TimeUntilNextProcess(),
                   remote_bitrate_estimator_->TimeUntilNextProcess());
 }
 
 void CongestionController::Process() {
   bitrate_controller_->Process();
   remote_bitrate_estimator_->Process();
+  probe_controller_->Process();
   MaybeTriggerOnNetworkChanged();
 }
 
 void CongestionController::MaybeTriggerOnNetworkChanged() {
   // TODO(perkj): |observer_| can be nullptr if the ctor that accepts a
   // BitrateObserver is used. Remove this check once the ctor is removed.
   if (!observer_)
     return;
 
   uint32_t bitrate_bps;
@@ skipping 37 matching lines @@
 bool CongestionController::IsSendQueueFull() const {
   return pacer_->ExpectedQueueTimeMs() > PacedSender::kMaxQueueLengthMs;
 }
 
 bool CongestionController::IsNetworkDown() const {
   rtc::CritScope cs(&critsect_);
   return network_state_ == kNetworkDown;
 }
 
 }  // namespace webrtc