Move the QtMultimedia spectrum demo to QtMultimediaKit
Change-Id: I60d7897eb84dfbe2ce5af5adeb23b33270aa7d7c Reviewed-on: http://codereview.qt.nokia.com/1483 Reviewed-by: Jonas Rabbe <jonas.rabbe@nokia.com>
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Michael Goddard
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Qt by Nokia
Qt by Nokia
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examples/spectrum/app/spectrum.h
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144
examples/spectrum/app/spectrum.h
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/****************************************************************************
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**
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** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** You may use this file under the terms of the BSD license as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
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** the names of its contributors may be used to endorse or promote
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** products derived from this software without specific prior written
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** permission.
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#ifndef SPECTRUM_H
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#define SPECTRUM_H
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#include <QtCore/qglobal.h>
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#include "utils.h"
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#include "fftreal_wrapper.h" // For FFTLengthPowerOfTwo
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//-----------------------------------------------------------------------------
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// Constants
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//-----------------------------------------------------------------------------
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// Number of audio samples used to calculate the frequency spectrum
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const int SpectrumLengthSamples = PowerOfTwo<FFTLengthPowerOfTwo>::Result;
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// Number of bands in the frequency spectrum
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const int SpectrumNumBands = 10;
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// Lower bound of first band in the spectrum
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const qreal SpectrumLowFreq = 0.0; // Hz
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// Upper band of last band in the spectrum
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const qreal SpectrumHighFreq = 1000.0; // Hz
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// Waveform window size in microseconds
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const qint64 WaveformWindowDuration = 500 * 1000;
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// Length of waveform tiles in bytes
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// Ideally, these would match the QAudio*::bufferSize(), but that isn't
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// available until some time after QAudio*::start() has been called, and we
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// need this value in order to initialize the waveform display.
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// We therefore just choose a sensible value.
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const int WaveformTileLength = 4096;
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// Fudge factor used to calculate the spectrum bar heights
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const qreal SpectrumAnalyserMultiplier = 0.15;
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// Disable message timeout
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const int NullMessageTimeout = -1;
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//-----------------------------------------------------------------------------
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// Types and data structures
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//-----------------------------------------------------------------------------
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enum WindowFunction {
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NoWindow,
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HannWindow
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};
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const WindowFunction DefaultWindowFunction = HannWindow;
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struct Tone {
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Tone(qreal freq = 0.0, qreal amp = 0.0)
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: frequency(freq), amplitude(amp)
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{ }
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// Start and end frequencies for swept tone generation
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qreal frequency;
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// Amplitude in range [0.0, 1.0]
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qreal amplitude;
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};
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struct SweptTone {
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SweptTone(qreal start = 0.0, qreal end = 0.0, qreal amp = 0.0)
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: startFreq(start), endFreq(end), amplitude(amp)
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{ Q_ASSERT(end >= start); }
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SweptTone(const Tone &tone)
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: startFreq(tone.frequency), endFreq(tone.frequency), amplitude(tone.amplitude)
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{ }
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// Start and end frequencies for swept tone generation
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qreal startFreq;
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qreal endFreq;
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// Amplitude in range [0.0, 1.0]
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qreal amplitude;
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};
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//-----------------------------------------------------------------------------
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// Macros
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//-----------------------------------------------------------------------------
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// Macro which connects a signal to a slot, and which causes application to
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// abort if the connection fails. This is intended to catch programming errors
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// such as mis-typing a signal or slot name. It is necessary to write our own
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// macro to do this - the following idiom
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// Q_ASSERT(connect(source, signal, receiver, slot));
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// will not work because Q_ASSERT compiles to a no-op in release builds.
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#define CHECKED_CONNECT(source, signal, receiver, slot) \
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if (!connect(source, signal, receiver, slot)) \
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qt_assert_x(Q_FUNC_INFO, "CHECKED_CONNECT failed", __FILE__, __LINE__);
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// Handle some dependencies between macros defined in the .pro file
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#ifdef DISABLE_WAVEFORM
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#undef SUPERIMPOSE_PROGRESS_ON_WAVEFORM
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#endif
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#endif // SPECTRUM_H
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