Delete IsMutable and IsExclusive methods.

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);
   }
 
-  // Create and stretch the output frame if it has not been created yet, is
-  // still in use by others, or its size is not same as the expected.
-  if (!output_frame_ || !output_frame_->IsExclusive() ||
-      output_frame_->width() != output_width ||
-      output_frame_->height() != output_height) {
-    output_frame_.reset(
-        cropped_input_frame->Stretch(output_width, output_height, true, true));
-    if (!output_frame_) {
-      LOG(LS_WARNING) << "Failed to stretch frame to " << output_width << "x"
-                      << output_height;
-      return NULL;
-    }
-  } else {
-    cropped_input_frame->StretchToFrame(output_frame_.get(), true, true);
-    output_frame_->SetTimeStamp(cropped_input_frame->GetTimeStamp());
-  }
-  return output_frame_->Copy();
+  std::unique_ptr<VideoFrame> output_frame(
+      cropped_input_frame->CreateWithBuffer(
+          pool_.CreateBuffer(output_width, output_height),
+          cropped_input_frame->rotation(),
+          cropped_input_frame->timestamp_us()));
+
+  cropped_input_frame->StretchToFrame(output_frame.get(), true, true);
+  return output_frame.release();

[tommi, 2016/05/25 12:14:25]

could we change the return value of CreateAliasedFrame to be
std::unique_ptr<VideoFrame>?

[nisse-webrtc, 2016/05/25 12:38:02]

Not easily. There's still a VideoFrameFactory subclass in chrome, which would
break.

 }
 
 }  // namespace cricket