Refactor scaling.

webrtc/media/base/videoframefactory.cc

 /*
  *  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.
  */
 
@@ skipping 21 matching lines @@
     return cropped_input_frame.release();
   }
 
   // If the frame is rotated, we need to switch the width and height.
   if (apply_rotation_ &&
       (input_frame->rotation == webrtc::kVideoRotation_90 ||
        input_frame->rotation == webrtc::kVideoRotation_270)) {
     std::swap(output_width, output_height);
   }
 
-  std::unique_ptr<VideoFrame> output_frame(new WebRtcVideoFrame(
-      pool_.CreateBuffer(output_width, output_height),
-      cropped_input_frame->rotation(),
-      cropped_input_frame->timestamp_us()));
+  rtc::scoped_refptr<webrtc::I420Buffer> scaled =
+      pool_.CreateBuffer(output_width, output_height);
+  webrtc::I420Buffer::CenterCropAndScale(
+      scaled, cropped_input_frame->video_frame_buffer());
 
-  cropped_input_frame->StretchToFrame(output_frame.get(), true, true);
-  return output_frame.release();
+  return new WebRtcVideoFrame(scaled, cropped_input_frame->rotation(),
+                              cropped_input_frame->timestamp_us());
 }
 
 }  // namespace cricket