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diff --git a/src/multimedia/audio/qaudioengine.h b/src/multimedia/audio/qaudioengine.h
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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.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QAUDIOENGINE_H
+#define QAUDIOENGINE_H
+
+#include <QtCore/qglobal.h>
+#include <QtMultimedia/qaudio.h>
+#include <QtMultimedia/qaudioformat.h>
+#include <QtMultimedia/qaudiodeviceinfo.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Multimedia)
+
+class Q_MULTIMEDIA_EXPORT QAbstractAudioDeviceInfo : public QObject
+{
+    Q_OBJECT
+
+public:
+    virtual QAudioFormat preferredFormat() const = 0;
+    virtual bool isFormatSupported(const QAudioFormat &format) const = 0;
+    virtual QAudioFormat nearestFormat(const QAudioFormat &format) const = 0;
+    virtual QString deviceName() const = 0;
+    virtual QStringList codecList() = 0;
+    virtual QList<int> frequencyList() = 0;
+    virtual QList<int> channelsList() = 0;
+    virtual QList<int> sampleSizeList() = 0;
+    virtual QList<QAudioFormat::Endian> byteOrderList() = 0;
+    virtual QList<QAudioFormat::SampleType> sampleTypeList() = 0;
+};
+
+class Q_MULTIMEDIA_EXPORT QAbstractAudioOutput : public QObject
+{
+    Q_OBJECT
+
+public:
+    virtual QIODevice* start(QIODevice* device) = 0;
+    virtual void stop() = 0;
+    virtual void reset() = 0;
+    virtual void suspend() = 0;
+    virtual void resume() = 0;
+    virtual int bytesFree() const = 0;
+    virtual int periodSize() const = 0;
+    virtual void setBufferSize(int value) = 0;
+    virtual int bufferSize() const = 0;
+    virtual void setNotifyInterval(int milliSeconds) = 0;
+    virtual int notifyInterval() const = 0;
+    virtual qint64 processedUSecs() const = 0;
+    virtual qint64 elapsedUSecs() const = 0;
+    virtual QAudio::Error error() const = 0;
+    virtual QAudio::State state() const = 0;
+    virtual QAudioFormat format() const = 0;
+
+Q_SIGNALS:
+    void stateChanged(QAudio::State);
+    void notify();
+};
+
+class Q_MULTIMEDIA_EXPORT QAbstractAudioInput : public QObject
+{
+    Q_OBJECT
+
+public:
+    virtual QIODevice* start(QIODevice* device) = 0;
+    virtual void stop() = 0;
+    virtual void reset() = 0;
+    virtual void suspend()  = 0;
+    virtual void resume() = 0;
+    virtual int bytesReady() const = 0;
+    virtual int periodSize() const = 0;
+    virtual void setBufferSize(int value) = 0;
+    virtual int bufferSize() const = 0;
+    virtual void setNotifyInterval(int milliSeconds) = 0;
+    virtual int notifyInterval() const = 0;
+    virtual qint64 processedUSecs() const = 0;
+    virtual qint64 elapsedUSecs() const = 0;
+    virtual QAudio::Error error() const = 0;
+    virtual QAudio::State state() const = 0;
+    virtual QAudioFormat format() const = 0;
+
+Q_SIGNALS:
+    void stateChanged(QAudio::State);
+    void notify();
+};
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QAUDIOENGINE_H