Reland of Remove SendPacer from ViEEncoder (patchset #13 id:240001 of https://codereview.we…

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/base/scoped_ptr.h"
 #include "webrtc/common_types.h"
 #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 BitrateObserver;
 class Clock;
-class PacedSender;
 class ProcessThread;
 class RemoteBitrateEstimator;
 class RemoteBitrateObserver;
 class TransportFeedbackObserver;
 
 class CongestionController : public CallStatsObserver, public Module {
  public:
+  // Observer class for bitrate changes announced due to change in bandwidth
+  // estimate or due to that the send pacer is full. Fraction loss and rtt is
+  // also part of this callback to allow the observer to optimize its settings
+  // for different types of network environments. The bitrate does not include
+  // packet headers and is measured in bits per second.
+  class Observer {
+   public:
+    virtual void OnNetworkChanged(uint32_t bitrate_bps,
+                                  uint8_t fraction_loss,  // 0 - 255.
+                                  int64_t rtt_ms) = 0;
+
+   protected:
+    virtual ~Observer() {}
+  };
+  // Deprecated
+  // TODO(perkj): Remove once no other clients use this ctor.
   CongestionController(Clock* clock,
                        BitrateObserver* bitrate_observer,
                        RemoteBitrateObserver* remote_bitrate_observer);
+  CongestionController(Clock* clock,
+                       Observer* observer,
+                       RemoteBitrateObserver* remote_bitrate_observer);
+  CongestionController(Clock* clock,
+                       Observer* observer,
+                       RemoteBitrateObserver* remote_bitrate_observer,
+                       std::unique_ptr<PacketRouter> packet_router,
+                       std::unique_ptr<PacedSender> pacer);
   virtual ~CongestionController();
 
   virtual void SetBweBitrates(int min_bitrate_bps,
                               int start_bitrate_bps,
                               int max_bitrate_bps);
   virtual void SignalNetworkState(NetworkState state);
   virtual BitrateController* GetBitrateController() const;
   virtual RemoteBitrateEstimator* GetRemoteBitrateEstimator(
       bool send_side_bwe);
   virtual int64_t GetPacerQueuingDelayMs() const;
   virtual PacedSender* pacer() { return pacer_.get(); }
-  virtual PacketRouter* packet_router() { return &packet_router_; }
+  virtual PacketRouter* packet_router() { return packet_router_.get(); }
   virtual TransportFeedbackObserver* GetTransportFeedbackObserver();
 
-  virtual void UpdatePacerBitrate(int bitrate_kbps,
-                                  int max_bitrate_kbps,
-                                  int min_bitrate_kbps);
+  void SetAllocatedSendBitrate(int allocated_bitrate_bps,
+                               int padding_bitrate_bps);
 
   virtual void OnSentPacket(const rtc::SentPacket& sent_packet);
 
   // 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();
+  void MaybeTriggerOnNetworkChanged();
+  // Updates |send_queue_is_full_|. Returns true if |send_queue_is_full_|
+  // has changed.
+  bool UpdateSendQueueStatus(bool send_queue_is_full);
+
   Clock* const clock_;
+  Observer* const observer_;
+  const std::unique_ptr<PacketRouter> packet_router_;
   const std::unique_ptr<PacedSender> pacer_;
   const std::unique_ptr<RemoteBitrateEstimator> remote_bitrate_estimator_;
   const std::unique_ptr<BitrateController> bitrate_controller_;
-  PacketRouter packet_router_;
   RemoteEstimatorProxy remote_estimator_proxy_;
   TransportFeedbackAdapter transport_feedback_adapter_;
   int min_bitrate_bps_;
+  rtc::CriticalSection critsect_;
+  bool send_queue_is_full_ GUARDED_BY(critsect_);
 
   RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(CongestionController);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_CONGESTION_CONTROLLER_INCLUDE_CONGESTION_CONTROLLER_H_