Handle end of stream for media...

media/base/video_frame_impl.cc

 // 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.
 
 #include "media/base/video_frame_impl.h"
 
 namespace media {
 
 // static
 void VideoFrameImpl::CreateFrame(VideoSurface::Format format,
@@ skipping 29 matching lines @@
         break;
       default:
         NOTREACHED();
         alloc_worked = false;
         break;
     }
   }
   *frame_out = alloc_worked ? frame : NULL;
 }
 
+// static
+void VideoFrameImpl::CreateEmptyFrame(scoped_refptr<VideoFrame>* frame_out) {
+  *frame_out = new VideoFrameImpl(VideoSurface::EMPTY, 0, 0);
+}
+
 static inline size_t RoundUp(size_t value, size_t alignment) {
   // Check that |alignment| is a power of 2.
   DCHECK((alignment + (alignment - 1)) == (alignment | (alignment - 1)));
   return ((value + (alignment - 1)) & ~(alignment-1));
 }
 
 bool VideoFrameImpl::AllocateRGB(size_t bytes_per_pixel) {
   // Round up to align at a 64-bit (8 byte) boundary for each row.  This
   // is sufficient for MMX reads (movq).
   size_t bytes_per_row = RoundUp(surface_.width * bytes_per_pixel, 8);
@@ skipping 55 matching lines @@
 
 VideoFrameImpl::~VideoFrameImpl() {
   // In multi-plane allocations, only a single block of memory is allocated
   // on the heap, and other |data| pointers point inside the same, single block
   // so just delete index 0.
   delete[] surface_.data[0];
 }
 
 bool VideoFrameImpl::Lock(VideoSurface* surface) {
   DCHECK(!locked_);
+  DCHECK_NE(surface_.format, VideoSurface::EMPTY);
   if (locked_) {
     memset(surface, 0, sizeof(*surface));
     return false;
   }
   locked_ = true;
   COMPILE_ASSERT(sizeof(*surface) == sizeof(surface_), surface_size_mismatch);
   memcpy(surface, &surface_, sizeof(*surface));
   return true;
 }
 
 void VideoFrameImpl::Unlock() {
   DCHECK(locked_);
+  DCHECK_NE(surface_.format, VideoSurface::EMPTY);
   locked_ = false;
 }
 
+bool VideoFrameImpl::IsEndOfStream() const {
+  return surface_.format == VideoSurface::EMPTY;
+}
+
 }  // namespace media