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diff --git a/src/metadata/m4a/mp4audioproperties.h b/src/metadata/m4a/mp4audioproperties.h
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+++ b/src/metadata/m4a/mp4audioproperties.h
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+/***************************************************************************
+    copyright            : (C) 2002, 2003, 2006 by Jochen Issing
+    email                : [email protected]
+ ***************************************************************************/
+
+/***************************************************************************
+ *   This library is free software; you can redistribute it and/or modify  *
+ *   it  under the terms of the GNU Lesser General Public License version  *
+ *   2.1 as published by the Free Software Foundation.                     *
+ *                                                                         *
+ *   This library is distributed in the hope that it will be useful, but   *
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of            *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU     *
+ *   Lesser General Public License for more details.                       *
+ *                                                                         *
+ *   You should have received a copy of the GNU Lesser General Public      *
+ *   License along with this library; if not, write to the Free Software   *
+ *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,            *
+ *   MA  02110-1301  USA                                                   *
+ ***************************************************************************/
+
+#ifndef MP4AUDIOPROPERTIES_H
+#define MP4AUDIOPROPERTIES_H MP4AUDIOPROPERTIES_H
+
+#include "audioproperties.h"
+
+namespace TagLib
+{
+  namespace MP4
+  {
+    class Mp4PropsProxy;
+
+    class AudioProperties : public TagLib::AudioProperties
+    {
+    public:
+      //! constructor
+      AudioProperties();
+      //! destructor
+      ~AudioProperties();
+
+      //! function to set the proxy
+      void setProxy( Mp4PropsProxy* proxy );
+
+      /*!
+       * Returns the length of the file in seconds.
+       */
+      int length() const;
+
+      /*!
+       * Returns the most appropriate bit rate for the file in kb/s.  For constant
+       * bitrate formats this is simply the bitrate of the file.  For variable
+       * bitrate formats this is either the average or nominal bitrate.
+       */
+      int bitrate() const;
+
+      /*!
+       * Returns the sample rate in Hz.
+       */
+      int sampleRate() const;
+
+      /*!
+       * Returns the number of audio channels.
+       */
+      int channels() const;
+
+    private:
+      class AudioPropertiesPrivate;
+      AudioPropertiesPrivate* d;
+    };
+  } // namespace MP4
+} // namespace TagLib
+
+#endif // MP4AUDIOPROPERTIES_H