Replace av_malloc with AlignedAlloc for memory allocation in VideoFrame.

media/base/video_frame.h

 // 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.
 
 #ifndef MEDIA_BASE_VIDEO_FRAME_H_
 #define MEDIA_BASE_VIDEO_FRAME_H_
 
 #include "base/callback.h"
 #include "base/md5.h"
+#include "build/build_config.h"
 #include "media/base/buffers.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/size.h"
 
 namespace media {
 
 class MEDIA_EXPORT VideoFrame : public base::RefCountedThreadSafe<VideoFrame> {
  public:
   enum {
+#if defined(ARCH_CPU_ARM_FAMILY)
+    kAlignmentSize = 16
+#else
+    kAlignmentSize = 32

[xhwang, 2012/12/02 02:13:13]

This is copied from DecoderBuffer. For VideoFrame, what exactly is the
requirement for alignment? How about just use 32 bytes alignment for all
VideoFrames?

+#endif
+  };
+
+  enum {
     kMaxPlanes = 3,
 
     kRGBPlane = 0,
 
     kYPlane = 0,
     kUPlane = 1,
     kVPlane = 2,
   };
 
   // Surface formats roughly based on FOURCC labels, see:
@@ skipping 176 matching lines @@
   base::Closure no_longer_needed_cb_;
 
   base::TimeDelta timestamp_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(VideoFrame);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_VIDEO_FRAME_H_