Refactor scaling.

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_video/libyuv/include/scaler.h"
+#include "webrtc/common_video/include/i420_buffer_pool.h"
 #include "webrtc/modules/video_coding/utility/moving_average.h"
 
 namespace webrtc {
 class QualityScaler {
  public:
   struct Resolution {
     int width;
     int height;
   };
 
   QualityScaler();
   void Init(int low_qp_threshold,
             int high_qp_threshold,
             int initial_bitrate_kbps,
             int width,
             int height,
             int fps);
   void ReportFramerate(int framerate);
   void ReportQP(int qp);
   void ReportDroppedFrame();
-  void OnEncodeFrame(const VideoFrame& frame);
+  void OnEncodeFrame(int width, int height);
   Resolution GetScaledResolution() const;
-  const VideoFrame& GetScaledFrame(const VideoFrame& frame);
+  rtc::scoped_refptr<VideoFrameBuffer> GetScaledBuffer(
+      const rtc::scoped_refptr<VideoFrameBuffer>& frame);
   int downscale_shift() const { return downscale_shift_; }
 
   // QP is obtained from VP8-bitstream for HW, so the QP corresponds to the
   // bitstream range of [0, 127] and not the user-level range of [0,63].
   static const int kLowVp8QpThreshold;
   static const int kBadVp8QpThreshold;
 
   // H264 QP is in the range [0, 51].
   static const int kLowH264QpThreshold;
   static const int kBadH264QpThreshold;
 
  private:
   void AdjustScale(bool up);
   void UpdateTargetResolution(int frame_width, int frame_height);
   void ClearSamples();
   void UpdateSampleCounts();
 
-  Scaler scaler_;
-  VideoFrame scaled_frame_;
+  I420BufferPool pool_;
 
   size_t num_samples_downscale_;
   size_t num_samples_upscale_;
   int measure_seconds_upscale_;
   MovingAverage<int> average_qp_upscale_;
   MovingAverage<int> average_qp_downscale_;
 
   int framerate_;
   int low_qp_threshold_;
   int high_qp_threshold_;
   MovingAverage<int> framedrop_percent_;
   Resolution res_;
 
   int downscale_shift_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_VIDEO_CODING_UTILITY_QUALITY_SCALER_H_