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/****************************************************************************
**
** 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
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