Move usage of QualityScaler to ViEEncoder.

webrtc/modules/video_coding/utility/quality_scaler.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.
  */
 
 #ifndef WEBRTC_MODULES_VIDEO_CODING_UTILITY_QUALITY_SCALER_H_
 #define WEBRTC_MODULES_VIDEO_CODING_UTILITY_QUALITY_SCALER_H_
 
 #include "webrtc/common_types.h"
+#include "webrtc/video_frame.h"
+#include "webrtc/base/sequenced_task_checker.h"
 #include "webrtc/common_video/include/i420_buffer_pool.h"
 #include "webrtc/modules/video_coding/utility/moving_average.h"
 
 namespace webrtc {
+
+// An interface for a class that receives scale up/down requests.
+class ScalingInterface {

[kthelgason, 2016/10/06 14:34:13]

It may make sense to place this somewhere else. Soliciting feedback!

+ public:
+  // Called as soon as an overuse is detected.
+  virtual void ScaleUp() = 0;
+  // Called periodically when the system is not overused any longer.
+  virtual void ScaleDown() = 0;
+
+ protected:
+  virtual ~ScalingInterface() {}
+};
+
 class QualityScaler {
  public:
   struct Resolution {
     int width;
     int height;
   };
 
   QualityScaler();
-  void Init(VideoCodecType codec_type,
-            int initial_bitrate_kbps,
-            int width,
-            int height,
+  virtual ~QualityScaler();
+  void Init(ScalingInterface* obeserver_, VideoCodecType codec_type, int fps);
+  void Init(ScalingInterface* obeserver_,
+            int low_qp_threshold,
+            int high_qp_threshold,
             int fps);
-  void Init(int low_qp_threshold,
-            int high_qp_threshold,
-            int initial_bitrate_kbps,
-            int width,
-            int height,
-            int fps);
+  void Stop();
   void ReportFramerate(int framerate);
+  void ReportDroppedFrame();
   void ReportQP(int qp);
-  void ReportDroppedFrame();
-  void OnEncodeFrame(int width, int height);
-  Resolution GetScaledResolution() const;
-  rtc::scoped_refptr<VideoFrameBuffer> GetScaledBuffer(
-      const rtc::scoped_refptr<VideoFrameBuffer>& frame);
-  int downscale_shift() const { return downscale_shift_; }
+  void CheckQP();
+  // This method declared virtual to help with testing.
+  virtual int64_t GetTimeoutMs();
 
  private:
+  class CheckQPTask;
   void ClearSamples();
-  void ScaleUp();
-  void ScaleDown();
-  void UpdateTargetResolution(int width, int height);
+  void ReportQPLow();
+  void ReportQPHigh();
 
-  I420BufferPool pool_;
+  ScalingInterface* observer_;
+  CheckQPTask* check_qp_task_;
+  rtc::SequencedTaskChecker task_checker_;
 
-  size_t num_samples_downscale_;
-  size_t num_samples_upscale_;
   bool fast_rampup_;
+  int64_t measure_interval_;
   MovingAverage average_qp_;
   MovingAverage framedrop_percent_;
 
   int low_qp_threshold_;
   int high_qp_threshold_;
-  Resolution target_res_;
-
-  int downscale_shift_;
-  int maximum_shift_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_VIDEO_CODING_UTILITY_QUALITY_SCALER_H_