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diff --git a/tests/manual/spectrum/spectrumapp/spectrum.h b/tests/manual/spectrum/spectrumapp/spectrum.h
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+/******************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the Qt Data Visualization module.
+**
+** $QT_BEGIN_LICENSE:COMM$
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** $QT_END_LICENSE$
+**
+******************************************************************************/
+
+#ifndef SPECTRUM_H
+#define SPECTRUM_H
+
+#include "utils.h"
+#include "fftreal_wrapper.h" // For FFTLengthPowerOfTwo
+#include <qglobal.h>
+
+//-----------------------------------------------------------------------------
+// Constants
+//-----------------------------------------------------------------------------
+
+// Number of audio samples used to calculate the frequency spectrum
+const int    SpectrumLengthSamples  = PowerOfTwo<FFTLengthPowerOfTwo>::Result;
+
+// Number of bands in the frequency spectrum
+const int    SpectrumNumBands       = 30;
+
+// Lower bound of first band in the spectrum
+const qreal  SpectrumLowFreq        = 0.0; // Hz
+
+// Upper band of last band in the spectrum
+const qreal  SpectrumHighFreq       = 1000.0; // Hz
+
+// Waveform window size in microseconds
+const qint64 WaveformWindowDuration = 500 * 1000;
+
+// Fudge factor used to calculate the spectrum bar heights
+const qreal SpectrumAnalyserMultiplier = 0.15;
+
+// Disable message timeout
+const int   NullMessageTimeout      = -1;
+
+
+//-----------------------------------------------------------------------------
+// Types and data structures
+//-----------------------------------------------------------------------------
+
+enum WindowFunction {
+    NoWindow,
+    HannWindow
+};
+
+const WindowFunction DefaultWindowFunction = HannWindow;
+
+struct Tone
+{
+    Tone(qreal freq = 0.0, qreal amp = 0.0)
+    :   frequency(freq), amplitude(amp)
+    { }
+
+    // Start and end frequencies for swept tone generation
+    qreal   frequency;
+
+    // Amplitude in range [0.0, 1.0]
+    qreal   amplitude;
+};
+
+struct SweptTone
+{
+    SweptTone(qreal start = 0.0, qreal end = 0.0, qreal amp = 0.0)
+    :   startFreq(start), endFreq(end), amplitude(amp)
+    { Q_ASSERT(end >= start); }
+
+    SweptTone(const Tone &tone)
+    :   startFreq(tone.frequency), endFreq(tone.frequency), amplitude(tone.amplitude)
+    { }
+
+    // Start and end frequencies for swept tone generation
+    qreal   startFreq;
+    qreal   endFreq;
+
+    // Amplitude in range [0.0, 1.0]
+    qreal   amplitude;
+};
+
+
+//-----------------------------------------------------------------------------
+// Macros
+//-----------------------------------------------------------------------------
+
+// Macro which connects a signal to a slot, and which causes application to
+// abort if the connection fails.  This is intended to catch programming errors
+// such as mis-typing a signal or slot name.  It is necessary to write our own
+// macro to do this - the following idiom
+//     Q_ASSERT(connect(source, signal, receiver, slot));
+// will not work because Q_ASSERT compiles to a no-op in release builds.
+
+#define CHECKED_CONNECT(source, signal, receiver, slot) \
+    if (!connect(source, signal, receiver, slot)) \
+        qt_assert_x(Q_FUNC_INFO, "CHECKED_CONNECT failed", __FILE__, __LINE__);
+
+#endif // SPECTRUM_H
+