Motown: New wrapper classes for ffmpeg format context and io context

services/media/framework_ffmpeg/ffmpeg_io.h

-// Copyright 2016 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 SERVICES_MEDIA_FRAMEWORK_FFMPEG_FFMPEG_IO_H_
-#define SERVICES_MEDIA_FRAMEWORK_FFMPEG_FFMPEG_IO_H_
-
-#include "services/media/framework/parts/reader.h"
-extern "C" {
-#include "third_party/ffmpeg/libavformat/avio.h"
-}
-
-namespace mojo {
-namespace media {
-
-struct AVIOContextDeleter {
-  void operator()(AVIOContext* context) const {
-    av_free(context->buffer);
-    av_free(context);
-  }
-};
-
-using AvioContextPtr = std::unique_ptr<AVIOContext, AVIOContextDeleter>;
-
-// Creates an ffmpeg avio_context for a given reader.
-AvioContextPtr CreateAvioContext(Reader* reader);
-
-}  // namespace media
-}  // namespace mojo
-
-#endif // SERVICES_MEDIA_FRAMEWORK_FFMPEG_FFMPEG_IO_H_