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diff --git a/src/multimedia/audio/qaudio.cpp b/src/multimedia/audio/qaudio.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtMultimedia module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** 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, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+
+#include <QtMultimedia/qaudio.h>
+
+
+QT_BEGIN_NAMESPACE
+
+namespace QAudio
+{
+
+class RegisterMetaTypes
+{
+public:
+    RegisterMetaTypes()
+    {
+        qRegisterMetaType<QAudio::Error>();
+        qRegisterMetaType<QAudio::State>();
+        qRegisterMetaType<QAudio::Mode>();
+    }
+
+} _register;
+
+}
+
+/*!
+    \namespace QAudio
+    \brief The QAudio namespace contains enums used by the audio classes.
+    \inmodule QtMultimedia
+    \ingroup multimedia
+    \since 4.6
+*/
+
+/*!
+    \enum QAudio::Error
+
+    \value NoError         No errors have occurred
+    \value OpenError       An error opening the audio device
+    \value IOError         An error occurred during read/write of audio device
+    \value UnderrunError   Audio data is not being fed to the audio device at a fast enough rate
+    \value FatalError      A non-recoverable error has occurred, the audio device is not usable at this time.
+*/
+
+/*!
+    \enum QAudio::State
+
+    \value ActiveState     Audio data is being processed, this state is set after start() is called
+                           and while audio data is available to be processed.
+    \value SuspendedState  The audio device is in a suspended state, this state will only be entered
+                           after suspend() is called.
+    \value StoppedState    The audio device is closed, not processing any audio data
+    \value IdleState       The QIODevice passed in has no data and audio system's buffer is empty, this state
+                           is set after start() is called and while no audio data is available to be processed.
+*/
+
+/*!
+    \enum QAudio::Mode
+
+    \value AudioOutput   audio output device
+    \value AudioInput    audio input device
+*/
+
+
+QT_END_NAMESPACE
+