Motown: ffmpeg implementations of framework 'parts'

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_