Handle end of stream for media...

media/base/video_frame_impl.h

 // Copyright (c) 2009 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.
 
 // Simple class that implements the VideoFrame interface with memory allocated
 // on the system heap.  This class supports every format defined in the
 // VideoSurface::Format enum.  The implementation attempts to properly align
 // allocations for maximum system bus efficency.
 #ifndef MEDIA_BASE_VIDEO_FRAME_IMPL_H_
 #define MEDIA_BASE_VIDEO_FRAME_IMPL_H_
 
 #include "media/base/buffers.h"
 
 namespace media {
 
 class VideoFrameImpl : public VideoFrame {
  public:
   static void CreateFrame(VideoSurface::Format format,
                           size_t width,
                           size_t height,
                           base::TimeDelta timestamp,
                           base::TimeDelta duration,
                           scoped_refptr<VideoFrame>* frame_out);
 
+  // Creates a frame with format equals to VideoSurface::EMPTY, width, height
+  // timestamp and duration are all 0.
+  static void CreateEmptyFrame(scoped_refptr<VideoFrame>* frame_out);
+
   // Implementation of VideoFrame.
   virtual bool Lock(VideoSurface* surface);
   virtual void Unlock();
+  virtual bool IsEndOfStream() const;
 
  private:
   // Clients must use the static CreateFrame() method to create a new frame.
   VideoFrameImpl(VideoSurface::Format format,
                  size_t video_width,
                  size_t video_height);
 
   virtual ~VideoFrameImpl();
 
   bool AllocateRGB(size_t bytes_per_pixel);
   bool AllocateYUV();
 
   bool locked_;
   VideoSurface surface_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoFrameImpl);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_VIDEO_FRAME_IMPL_H_