Make the BWE threshold adaptive.

webrtc/modules/remote_bitrate_estimator/overuse_detector.h

Index: webrtc/modules/remote_bitrate_estimator/overuse_detector.h
diff --git a/webrtc/modules/remote_bitrate_estimator/overuse_detector.h b/webrtc/modules/remote_bitrate_estimator/overuse_detector.h
index 8269368ae04e6f387b897730edea3cc3e59833db..307d4b6678e51a0db8419ee471b91eca0556bac1 100644
--- a/webrtc/modules/remote_bitrate_estimator/overuse_detector.h
+++ b/webrtc/modules/remote_bitrate_estimator/overuse_detector.h
@@ -23,7 +23,7 @@ enum RateControlRegion;
 class OveruseDetector {
  public:
   explicit OveruseDetector(const OverUseDetectorOptions& options);
-  ~OveruseDetector();
+  virtual ~OveruseDetector();
 
   // Update the detection state based on the estimated inter-arrival time delta
   // offset. |timestamp_delta| is the delta between the last timestamp which the
@@ -34,24 +34,32 @@ class OveruseDetector {
   BandwidthUsage Detect(double offset,
                         double timestamp_delta,
                         int num_of_deltas,
-                        int64_t now_ms);
+                        int64_t now_ms,
+                        int incoming_bitrate);
 
   // Returns the current detector state.
   BandwidthUsage State() const;
 
-  // Sets the current rate-control region as decided by RemoteRateControl. This
-  // affects the sensitivity of the detector.
-  void SetRateControlRegion(webrtc::RateControlRegion region);
+  virtual bool AdaptiveThresholdExperimentIsEnabled() const;
+  virtual bool ExperimentVariationIsEnabled(const char* variation) const;
 
  private:
+  void UpdateThreshold(double modified_offset,
+                       int64_t now_ms,
+                       int incoming_bitrate);

[Gaetano Carlucci, 2015/06/25 11:58:36]

we can remove the input incoming_bitrate

[stefan-webrtc, 2015/06/25 12:37:13]

Done.

+  bool GetExperimentThresholds(double* k_up, double* k_down) const;
+
   // Must be first member variable. Cannot be const because we need to be
   // copyable.
   webrtc::OverUseDetectorOptions options_;
   double threshold_;
+  int64_t last_update_ms_;
   double prev_offset_;
   double time_over_using_;
   int overuse_counter_;
   BandwidthUsage hypothesis_;
+  double k_up_;
+  double k_down_;
 
   DISALLOW_COPY_AND_ASSIGN(OveruseDetector);
 };