Adding ChunkDemuxer implementation.

media/ffmpeg/ffmpeg_common.h

 // Copyright (c) 2011 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_FFMPEG_FFMPEG_COMMON_H_
 #define MEDIA_FFMPEG_FFMPEG_COMMON_H_
 
 // Used for FFmpeg error codes.
 #include <cerrno>
 
@@ skipping 91 matching lines @@
                                  const base::TimeDelta& end_time,
                                  int64* bytes,
                                  base::TimeDelta* range_start,
                                  base::TimeDelta* range_end);
 
 // Calculates the width and height of the video surface using the video's
 // encoded dimensions and sample_aspect_ratio.
 int GetSurfaceHeight(AVStream* stream);
 int GetSurfaceWidth(AVStream* stream);
 
+// Closes & destroys all AVStreams in the context and then closes &
+// destroys the AVFormatContext.
+void DestroyAVFormatContext(AVFormatContext* format_context);
+
 }  // namespace media
 
 #endif  // MEDIA_FFMPEG_FFMPEG_COMMON_H_