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diff --git a/webrtc/modules/video_coding/utility/quality_scaler.h b/webrtc/modules/video_coding/utility/quality_scaler.h
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+/*
+ *  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_video/libyuv/include/scaler.h"
+#include "webrtc/modules/video_coding/utility/moving_average.h"
+
+namespace webrtc {
+class QualityScaler {
+ public:
+  static const int kDefaultLowQpDenominator;
+  static const int kDefaultMinDownscaleDimension;
+  struct Resolution {
+    int width;
+    int height;
+  };
+
+  QualityScaler();
+  void Init(int low_qp_threshold,
+            int high_qp_threshold,
+            bool use_framerate_reduction);
+  void SetMinResolution(int min_width, int min_height);
+  void ReportFramerate(int framerate);
+  void ReportQP(int qp);
+  void ReportDroppedFrame();
+  void Reset(int framerate, int bitrate, int width, int height);
+  void OnEncodeFrame(const VideoFrame& frame);
+  Resolution GetScaledResolution() const;
+  const VideoFrame& GetScaledFrame(const VideoFrame& frame);
+  int GetTargetFramerate() const;
+  int downscale_shift() const { return downscale_shift_; }
+
+ private:
+  void AdjustScale(bool up);
+  void ClearSamples();
+
+  Scaler scaler_;
+  VideoFrame scaled_frame_;
+
+  size_t num_samples_;
+  int framerate_;
+  int target_framerate_;
+  int low_qp_threshold_;
+  int high_qp_threshold_;
+  MovingAverage<int> framedrop_percent_;
+  MovingAverage<int> average_qp_;
+  Resolution res_;
+
+  int downscale_shift_;
+  int framerate_down_;
+  bool use_framerate_reduction_;
+  int min_width_;
+  int min_height_;
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_VIDEO_CODING_UTILITY_QUALITY_SCALER_H_