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diff --git a/src/imports/audioengine/qsoundinstance_p.h b/src/imports/audioengine/qsoundinstance_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** 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.
+**
+** 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.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QSOUNDINSTANCE_P_H
+#define QSOUNDINSTANCE_P_H
+
+#include <QVector3D>
+#include <QObject>
+#include "qsoundsource_p.h"
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+class QDeclarativeSound;
+class QDeclarativeAudioEngine;
+
+class QSoundInstance : public QObject
+{
+    Q_OBJECT
+public:
+    explicit QSoundInstance(QObject *parent);
+    ~QSoundInstance();
+
+    void play();
+
+    enum State
+    {
+        StopppedState = QSoundSource::StoppedState,
+        PlayingState = QSoundSource::PlayingState,
+        PausedState = QSoundSource::PausedState
+    };
+    State state() const;
+
+    void setPosition(const QVector3D& position);
+    void setDirection(const QVector3D& direction);
+    void setVelocity(const QVector3D& velocity);
+
+    //this gain and pitch is used for dynamic user control during execution
+    void setGain(qreal gain);
+    void setPitch(qreal pitch);
+    void setCone(qreal innerAngle, qreal outerAngle, qreal outerGain);
+
+    //this varPitch and varGain is calculated from config in PlayVariation
+    void updateVariationParameters(qreal varPitch, qreal varGain, bool looping);
+
+    void bindSoundDescription(QDeclarativeSound *sound);
+
+    void update3DVolume(const QVector3D& listenerPosition);
+
+    bool attenuationEnabled() const;
+
+Q_SIGNALS:
+    void stateChanged(QSoundInstance::State state);
+
+public Q_SLOTS:
+    void pause();
+    void stop();
+
+private Q_SLOTS:
+    void resume();
+    void bufferReady();
+    void categoryVolumeChanged();
+    void handleSourceStateChanged(QSoundSource::State);
+
+private:
+    void setState(State state);
+    void prepareNewVariation();
+    void detach();
+    qreal categoryVolume() const;
+    void updatePitch();
+    void updateGain();
+    void updateConeOuterGain();
+
+    void sourcePlay();
+    void sourcePause();
+    void sourceStop();
+
+    QSoundSource *m_soundSource;
+    QSoundBuffer *m_bindBuffer;
+
+    QDeclarativeSound *m_sound;
+    int m_variationIndex;
+
+    bool                 m_isReady; //true if the sound source is already bound to some sound buffer
+    qreal                m_gain;
+    qreal                m_attenuationGain;
+    qreal                m_varGain;
+    qreal                m_pitch;
+    qreal                m_varPitch;
+    State                m_state;
+    qreal                m_coneOuterGain;
+
+    QDeclarativeAudioEngine *m_engine;
+};
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QSOUNDINSTANCE_P_H