--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/demos/spectrum/app/frequencyspectrum.h	Fri Jun 11 14:24:45 2010 +0300
@@ -0,0 +1,95 @@
+/****************************************************************************
+**
+** 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 examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** 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 Nokia Corporation and its Subsidiary(-ies) 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 THE COPYRIGHT OWNER OR CONTRIBUTORS 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 FREQUENCYSPECTRUM_H
+#define FREQUENCYSPECTRUM_H
+
+#include <QtCore/QVector>
+
+/**
+ * Represents a frequency spectrum as a series of elements, each of which
+ * consists of a frequency, an amplitude and a phase.
+ */
+class FrequencySpectrum {
+public:
+    FrequencySpectrum(int numPoints = 0);
+
+    struct Element {
+        Element()
+        :   frequency(0.0), amplitude(0.0), phase(0.0), clipped(false)
+        { }
+
+        /**
+         * Frequency in Hertz
+         */
+        qreal frequency;
+
+        /**
+         * Amplitude in range [0.0, 1.0]
+         */
+        qreal amplitude;
+
+        /**
+         * Phase in range [0.0, 2*PI]
+         */
+        qreal phase;
+
+        /**
+         * Indicates whether value has been clipped during spectrum analysis
+         */
+        bool clipped;
+    };
+
+    typedef QVector<Element>::iterator iterator;
+    typedef QVector<Element>::const_iterator const_iterator;
+
+    void reset();
+
+    int count() const;
+    Element& operator[](int index);
+    const Element& operator[](int index) const;
+    iterator begin();
+    iterator end();
+    const_iterator begin() const;
+    const_iterator end() const;
+
+private:
+    QVector<Element> m_elements;
+
+};
+
+#endif // FREQUENCYSPECTRUM_H