Add HE AAC support to ISO BMFF.

content/common/gpu/media/h264_bit_reader.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 CONTENT_COMMON_GPU_MEDIA_H264_BIT_READER_H_
+#define CONTENT_COMMON_GPU_MEDIA_H264_BIT_READER_H_
+
+#include "base/compiler_specific.h"
+#include "media/base/bit_reader.h"
+
+namespace content {
+
+// A class to provide bit-granularity reading of H.264 streams.
+// This class takes into account H.264 stream-specific constraints, such as
+// skipping emulation-prevention bytes and stop bits. See spec for more
+// details.
+class H264BitReader : public media::BitReader {
+ public:
+  H264BitReader();
+  virtual ~H264BitReader();
+
+ private:
+  // This function handles the H.264 escape sequence and stop bit.
+  virtual void UpdateCurrByte() OVERRIDE;
+
+  DISALLOW_COPY_AND_ASSIGN(H264BitReader);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_COMMON_GPU_MEDIA_H264_BIT_READER_H_