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diff --git a/examples/mobile/quickhit/ga_src/GEInterfaces.h b/examples/mobile/quickhit/ga_src/GEInterfaces.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 demonstration applications 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 __GE_IGA_INTERFACES__
+#define __GE_IGA_INTERFACES__
+
+#include <QMutex>
+
+namespace GE {
+
+#define AUDIO_FREQUENCY 22050
+#define AUDIO_SAMPLE_TYPE short
+#define AUDIO_SAMPLE_BITS 16
+
+    class IAudioSource {
+    public:
+        IAudioSource();
+        virtual ~IAudioSource();
+
+        virtual int pullAudio( AUDIO_SAMPLE_TYPE *target, int bufferLength ) = 0;
+        virtual bool canBeDestroyed() { return false; }
+
+        IAudioSource *m_next;                // for listing, do not touch if you don't know what you are doing.
+    };
+
+
+    class CAudioMixer : public IAudioSource {
+    public:
+        CAudioMixer();
+        virtual ~CAudioMixer();
+        void destroyList();                        // destroy all the sources in the list
+
+
+        IAudioSource* addAudioSource( IAudioSource *s );        // add new audio source to the list
+        bool removeAudioSource( IAudioSource *s );                      // remove an audio source from the list
+        int pullAudio( AUDIO_SAMPLE_TYPE *target, int bufferLength );
+        void setGeneralVolume( float vol );
+
+
+    protected:
+        QMutex m_mutex;
+        int m_fixedGeneralVolume;
+        AUDIO_SAMPLE_TYPE *m_mixingBuffer;
+        int m_mixingBufferLength;
+        IAudioSource *m_sourceList;
+    };
+
+};
+
+
+#endif