Created VideoFramePool to avoid unnecessary VideoFrame alloc/free.

media/base/video_frame.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/base/video_frame.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
@@ skipping 163 matching lines @@
   frame->strides_[kUPlane] = u_stride;
   frame->strides_[kVPlane] = v_stride;
   frame->data_[kYPlane] = y_data;
   frame->data_[kUPlane] = u_data;
   frame->data_[kVPlane] = v_data;
   frame->no_longer_needed_cb_ = no_longer_needed_cb;
   return frame;
 }
 
 // static
+scoped_refptr<VideoFrame> VideoFrame::WrapVideoFrame(
+      const scoped_refptr<VideoFrame>& frame,
+      const base::Closure& no_longer_needed_cb) {
+  scoped_refptr<VideoFrame> wrapped_frame(new VideoFrame(
+      frame->format(), frame->coded_size(), frame->visible_rect(),
+      frame->natural_size(), frame->GetTimestamp(), frame->end_of_stream()));
+
+  for (size_t i = 0; i < NumPlanes(frame->format()); ++i) {
+    wrapped_frame->strides_[i] = frame->stride(i);
+    wrapped_frame->data_[i] = frame->data(i);
+  }
+
+  wrapped_frame->no_longer_needed_cb_ = no_longer_needed_cb;
+  return wrapped_frame;
+}
+
+// static
 scoped_refptr<VideoFrame> VideoFrame::CreateEOSFrame() {
   return new VideoFrame(VideoFrame::UNKNOWN,
                         gfx::Size(),
                         gfx::Rect(),
                         gfx::Size(),
                         kNoTimestamp(),
                         true);
 }
 
 // static
@@ skipping 309 matching lines @@
     : mailbox_(mailbox),
       sync_point_(sync_point),
       release_callback_(release_callback) {}
 
 VideoFrame::MailboxHolder::~MailboxHolder() {
   if (!release_callback_.is_null())
     release_callback_.Run(sync_point_);
 }
 
 }  // namespace media