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diff --git a/src/plugins/coreaudio/coreaudioutils.h b/src/plugins/coreaudio/coreaudioutils.h
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+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef IOSAUDIOUTILS_H
+#define IOSAUDIOUTILS_H
+
+#include <CoreAudio/CoreAudioTypes.h>
+
+#include <QtMultimedia/QAudioFormat>
+#include <QtCore/qglobal.h>
+
+QT_BEGIN_NAMESPACE
+
+class CoreAudioUtils
+{
+public:
+    static quint64 currentTime();
+    static double frequency();
+    static QAudioFormat toQAudioFormat(const AudioStreamBasicDescription& streamFormat);
+    static AudioStreamBasicDescription toAudioStreamBasicDescription(QAudioFormat const& audioFormat);
+
+private:
+    static void initialize();
+    static double sFrequency;
+    static bool sIsInitialized;
+};
+
+class CoreAudioRingBuffer
+{
+public:
+    typedef QPair<char*, int> Region;
+
+    CoreAudioRingBuffer(int bufferSize);
+    ~CoreAudioRingBuffer();
+
+    Region acquireReadRegion(int size);
+    void releaseReadRegion(Region const& region);
+    Region acquireWriteRegion(int size);
+    void releaseWriteRegion(Region const& region);
+
+    int used() const;
+    int free() const;
+    int size() const;
+
+    void reset();
+
+private:
+    int     m_bufferSize;
+    int     m_readPos;
+    int     m_writePos;
+    char*   m_buffer;
+    QAtomicInt  m_bufferUsed;
+};
+
+QT_END_NAMESPACE
+
+#endif // IOSAUDIOUTILS_H