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// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#ifndef SPECTRUM_H
#define SPECTRUM_H
#include "fftreal_wrapper.h" // For FFTLengthPowerOfTwo
#include "utils.h"
#include <QtGlobal>
//-----------------------------------------------------------------------------
// 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 };
Q_DECLARE_METATYPE(WindowFunction)
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;
};
// 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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