--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/demos/spectrum/app/spectrum.h	Fri Jun 11 14:24:45 2010 +0300
@@ -0,0 +1,141 @@
+/****************************************************************************
+**
+** 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 SPECTRUM_H
+#define SPECTRUM_H
+
+#include <QtCore/qglobal.h>
+#include "utils.h"
+#include "fftreal_wrapper.h" // For FFTLengthPowerOfTwo
+
+//-----------------------------------------------------------------------------
+// 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       = 10;
+
+// 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;
+
+// Length of waveform tiles in bytes
+// Ideally, these would match the QAudio*::bufferSize(), but that isn't
+// available until some time after QAudio*::start() has been called, and we
+// need this value in order to initialize the waveform display.
+// We therefore just choose a sensible value.
+const int   WaveformTileLength      = 4096;
+
+// 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__);
+
+// Handle some dependencies between macros defined in the .pro file
+
+#ifdef DISABLE_WAVEFORM
+#undef SUPERIMPOSE_PROGRESS_ON_WAVEFORM
+#endif
+
+#endif // SPECTRUM_H
+