Add interval estimator to remote bitrate estimator

webrtc/modules/remote_bitrate_estimator/aimd_rate_control.h

 /*
  *  Copyright (c) 2014 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 25 matching lines @@
   // estimate. Should be used to decide if we should reduce the rate further
   // when over-using.
   bool TimeToReduceFurther(int64_t time_now,
                            uint32_t incoming_bitrate_bps) const;
   uint32_t LatestEstimate() const;
   uint32_t UpdateBandwidthEstimate(int64_t now_ms);
   void SetRtt(int64_t rtt);
   void Update(const RateControlInput* input, int64_t now_ms);
   void SetEstimate(int bitrate_bps, int64_t now_ms);
 
+  // Returns the increase rate which is used when used bandwidth is near the
+  // maximal available bandwidth.
+  virtual int GetNearMaxIncreaseRateBps() const;
+
+  virtual rtc::Optional<int> GetLastBitrateDecreaseBps() const;
+
  private:
   // Update the target bitrate according based on, among other things,
   // the current rate control state, the current target bitrate and the incoming
   // bitrate. When in the "increase" state the bitrate will be increased either
   // additively or multiplicatively depending on the rate control region. When
   // in the "decrease" state the bitrate will be decreased to slightly below the
   // incoming bitrate. When in the "hold" state the bitrate will be kept
   // constant to allow built up queues to drain.
   uint32_t ChangeBitrate(uint32_t current_bit_rate,
                          uint32_t incoming_bit_rate,
                          int64_t now_ms);
   uint32_t MultiplicativeRateIncrease(int64_t now_ms, int64_t last_ms,
                                       uint32_t current_bitrate_bps) const;
-  uint32_t AdditiveRateIncrease(int64_t now_ms, int64_t last_ms,
-                                int64_t response_time_ms) const;
+  uint32_t AdditiveRateIncrease(int64_t now_ms, int64_t last_ms) const;
   void UpdateChangePeriod(int64_t now_ms);
   void UpdateMaxBitRateEstimate(float incoming_bit_rate_kbps);
   void ChangeState(const RateControlInput& input, int64_t now_ms);
   void ChangeState(RateControlState new_state);
   void ChangeRegion(RateControlRegion region);
 
   uint32_t min_configured_bitrate_bps_;
   uint32_t max_configured_bitrate_bps_;
   uint32_t current_bitrate_bps_;
   float avg_max_bitrate_kbps_;
   float var_max_bitrate_kbps_;
   RateControlState rate_control_state_;
   RateControlRegion rate_control_region_;
   int64_t time_last_bitrate_change_;
   RateControlInput current_input_;
   bool updated_;
   int64_t time_first_incoming_estimate_;
   bool bitrate_is_initialized_;
   float beta_;
   int64_t rtt_;
   bool in_experiment_;
+  rtc::Optional<int> last_decrease_;
 };
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_AIMD_RATE_CONTROL_H_