Probing: Add support for exponential startup probing

webrtc/modules/congestion_controller/include/congestion_controller.h

 /*
  *  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.
  */
 
 #ifndef WEBRTC_MODULES_CONGESTION_CONTROLLER_INCLUDE_CONGESTION_CONTROLLER_H_
 #define WEBRTC_MODULES_CONGESTION_CONTROLLER_INCLUDE_CONGESTION_CONTROLLER_H_
 
 #include <memory>
 
 #include "webrtc/base/constructormagic.h"
 #include "webrtc/common_types.h"
+#include "webrtc/modules/bitrate_controller/include/bitrate_controller.h"

[stefan-webrtc, 2016/09/02 13:10:22]

Why is this change needed?

 #include "webrtc/modules/include/module.h"
 #include "webrtc/modules/include/module_common_types.h"
 #include "webrtc/modules/pacing/packet_router.h"
 #include "webrtc/modules/pacing/paced_sender.h"
 #include "webrtc/modules/remote_bitrate_estimator/remote_estimator_proxy.h"
 #include "webrtc/modules/remote_bitrate_estimator/transport_feedback_adapter.h"
 
 namespace rtc {
 struct SentPacket;
 }
 
 namespace webrtc {
 
-class BitrateController;
 class Clock;
 class ProcessThread;
 class RateLimiter;
 class RemoteBitrateEstimator;
 class RemoteBitrateObserver;
 class RtcEventLog;
 class TransportFeedbackObserver;
 
 class CongestionController : public CallStatsObserver, public Module {
  public:
@@ skipping 47 matching lines @@
   // sending streams.  This is the minimum bitrate the PacedSender will use.
   // Note that CongestionController::OnNetworkChanged can still be called with
   // a lower bitrate estimate.
   // |max_padding_bitrate_bps| is the max bitrate the send streams request for
   // padding. This can be higher than the current network estimate and tells
   // the PacedSender how much it should max pad unless there is real packets to
   // send.
   void SetAllocatedSendBitrateLimits(int min_send_bitrate_bps,
                                      int max_padding_bitrate_bps);
 
-  virtual void OnSentPacket(const rtc::SentPacket& sent_packet);
+  void OnSentPacket(const rtc::SentPacket& sent_packet);
+
+  // Called by delay based estimator to report estimated bandwidth.
+  void OnDelayBasedBweChanged(int bitrate_bps);
+  // Called by delay based estimator to evaluate if probes need to be handled.
+  bool IsExpectingProbingResults();

[stefan-webrtc, 2016/09/02 13:10:22]

I'm not super happy about making these public. These should be internal to the
congestion controller and not be exposed.

 
   // Implements CallStatsObserver.
   void OnRttUpdate(int64_t avg_rtt_ms, int64_t max_rtt_ms) override;
 
   // Implements Module.
   int64_t TimeUntilNextProcess() override;
   void Process() override;
 
  private:
   void Init();
@@ skipping 20 matching lines @@
   uint8_t last_reported_fraction_loss_ GUARDED_BY(critsect_);
   int64_t last_reported_rtt_ GUARDED_BY(critsect_);
   NetworkState network_state_ GUARDED_BY(critsect_);
 
   RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(CongestionController);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_CONGESTION_CONTROLLER_INCLUDE_CONGESTION_CONTROLLER_H_