Refactor VideoDenoiser to work with I420Buffer, not VideoFrame.

webrtc/modules/video_processing/frame_preprocessor.cc

 /*
  *  Copyright (c) 2012 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 78 matching lines @@
     return nullptr;
   }
 
   vd_->UpdateIncomingframe_rate();
   if (vd_->DropFrame()) {
     return nullptr;
   }
 
   const VideoFrame* current_frame = &frame;
   if (denoiser_) {
-    VideoFrame* denoised_frame = &denoised_frame_[0];
-    VideoFrame* denoised_frame_prev = &denoised_frame_[1];
+    rtc::scoped_refptr<I420Buffer>* denoised_frame = &denoised_buffer_[0];
+    rtc::scoped_refptr<I420Buffer>* denoised_frame_prev = &denoised_buffer_[1];
     // Swap the buffer to save one memcpy in DenoiseFrame.
     if (denoised_frame_toggle_) {
-      denoised_frame = &denoised_frame_[1];
-      denoised_frame_prev = &denoised_frame_[0];
+      denoised_frame = &denoised_buffer_[1];
+      denoised_frame_prev = &denoised_buffer_[0];
     }
     // Invert the flag.
     denoised_frame_toggle_ ^= 1;
-    denoiser_->DenoiseFrame(*current_frame, denoised_frame, denoised_frame_prev,
-                            true);
-    current_frame = denoised_frame;
+    denoiser_->DenoiseFrame(current_frame->video_frame_buffer(), denoised_frame,
+                            denoised_frame_prev, true);
+    denoised_frame_.ShallowCopy(*current_frame);
+    denoised_frame_.set_video_frame_buffer(*denoised_frame);
+    current_frame = &denoised_frame_;
   }
 
   if (spatial_resampler_->ApplyResample(current_frame->width(),
                                         current_frame->height())) {
     if (spatial_resampler_->ResampleFrame(*current_frame, &resampled_frame_) !=
         VPM_OK) {
       return nullptr;
     }
     current_frame = &resampled_frame_;
   }
 
   ++frame_cnt_;
   return current_frame;
 }
 
 }  // namespace webrtc