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diff --git a/demos/mobile/guitartuner/src/guitartunerui.h b/demos/mobile/guitartuner/src/guitartunerui.h
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+/******************************************************************************
+ *
+ * Copyright (c) 2011 Nokia Corporation and/or its subsidiary(-ies).
+ * All rights reserved.
+ * Contact: Nokia Corporation (qt-info@nokia.com)
+ *
+ * $QT_BEGIN_LICENSE:BSD$
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the author organization nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * $QT_END_LICENSE$
+ *
+ *****************************************************************************/
+
+#ifndef GUITARTUNERUI_H
+#define GUITARTUNERUI_H
+
+#include <QWidget>
+#include <QDebug>
+
+namespace Ui {
+    class GuitarTunerUI;
+}
+
+const qreal FrequencyE = 82.407;
+const qreal FrequencyA = 110.00;
+const qreal FrequencyD = 146.83;
+const qreal FrequencyG = 196.00;
+const qreal FrequencyB = 246.94;
+const qreal FrequencyE2 = 329.63;
+
+class GuitarTunerUI : public QWidget
+{
+    Q_OBJECT
+
+public:
+    explicit GuitarTunerUI(QWidget *parent = 0);
+    ~GuitarTunerUI();
+
+    qreal getVolume() const;
+    bool getMuteState() const;
+    qreal getMicrophoneSensitivity() const;
+    bool isInputModeActive() const;
+    qreal getFrequency() const;
+    int getScaleMaximumValue() const;
+    void setMaximumVoiceDifference(int max);
+    void setMaximumPrecisionPerNote(int max);
+
+public slots:
+    void toggleSound(bool off);
+    void next();
+    void prev();
+    void changeVolume();
+    void toggleInputOrOutput();
+
+    void lowVoice();
+    void voiceDifference(qreal difference);
+    void correctFrequencyObtained();
+
+signals:
+    void modeChanged(bool isInput);
+    void volumeChanged(qreal volume);
+    void microphoneSensitivityChanged(qreal sensitivity);
+    void muteChanged(bool isMuted);
+    void targetFrequencyChanged(qreal targetFrequency);
+
+protected:
+    void changeEvent(QEvent *e);
+
+private:
+    Ui::GuitarTunerUI *ui;
+    void changeTone(int newIndex);
+    qreal getVolumeFromSoundSlider() const;
+    int m_currentToneIndex;
+    QString m_currentToneString;
+    qreal m_currentToneFrequency;
+    void updateFrequencyByToneIndex(int index);
+    bool m_outputActive;
+    bool m_muted;
+    qreal m_outputVolumeLevel;
+    qreal m_inputVolumeLevel;
+    int m_maximumPrecision;
+};
+
+#endif // GUITARTUNERUI_H