Implement kBalanced degradation preference.

webrtc/video/vie_encoder.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.
  */
 
@@ skipping 171 matching lines @@
   class AdaptCounter final {
    public:
     AdaptCounter();
     ~AdaptCounter();
 
     // Get number of adaptation downscales for |reason|.
     AdaptCounts Counts(int reason) const;
 
     std::string ToString() const;
 
-    void IncrementFramerate(int reason, int delta);
-    void IncrementResolution(int reason, int delta);
+    void IncrementFramerate(int reason);
+    void IncrementResolution(int reason);
+    void DecrementFramerate(int reason);
+    void DecrementResolution(int reason);
+    void DecrementFramerate(int reason, int cur_fps);
 
     // Gets the total number of downgrades (for all adapt reasons).
     int FramerateCount() const;
     int ResolutionCount() const;
-    int TotalCount() const;
 
     // Gets the total number of downgrades for |reason|.
     int FramerateCount(int reason) const;
     int ResolutionCount(int reason) const;
     int TotalCount(int reason) const;
 
    private:
     std::string ToString(const std::vector<int>& counters) const;
     int Count(const std::vector<int>& counters) const;
+    void MoveCount(std::vector<int>* counters, int from_reason);
 
     // Degradation counters holding number of framerate/resolution reductions
     // per adapt reason.
     std::vector<int> fps_counters_;
     std::vector<int> resolution_counters_;
   };
 
   AdaptCounter& GetAdaptCounter() RUN_ON(&encoder_queue_);
   const AdaptCounter& GetConstAdaptCounter() RUN_ON(&encoder_queue_);
   void UpdateAdaptationStats(AdaptReason reason) RUN_ON(&encoder_queue_);
@@ skipping 78 matching lines @@
   // All public methods are proxied to |encoder_queue_|. It must must be
   // destroyed first to make sure no tasks are run that use other members.
   rtc::TaskQueue encoder_queue_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(ViEEncoder);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_VIDEO_VIE_ENCODER_H_