Implement ISO BMFF support in Media Source (try 2).

media/mp4/cenc.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_MP4_CENC_H_
+#define MEDIA_MP4_CENC_H_
+
+#include <vector>
+
+#include "base/basictypes.h"
+
+namespace media {
+namespace mp4 {
+
+class BufferReader;
+
+struct SubsampleSizes {
+  uint16 clear_size;
+  uint32 encrypted_size;
+};
+
+struct FrameCENCInfo {
+  std::vector<uint8> iv;
+  std::vector<SubsampleSizes> subsamples;
+
+  FrameCENCInfo();
+  ~FrameCENCInfo();
+  bool Parse(int iv_size, BufferReader* r);
+  size_t GetTotalSize() const;
+};
+
+
+}  // namespace mp4
+}  // namespace media
+
+#endif  // MEDIA_MP4_CENC_H_