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/****************************************************************************
**
** Copyright (C) 2013 Digia Plc
** All rights reserved.
** For any questions to Digia, please use contact form at http://qt.digia.com
**
** This file is part of the QtDataVis3D module.
**
** Licensees holding valid Qt Enterprise licenses may use this file in
** accordance with the Qt Enterprise License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia.
**
** If you have questions regarding the use of this file, please use
** contact form at http://qt.digia.com
**
****************************************************************************/
#ifndef SPECTRUMANALYSER_H
#define SPECTRUMANALYSER_H
#include <QByteArray>
#include <QObject>
#include <QVector>
#include "frequencyspectrum.h"
#include "spectrum.h"
#include "FFTRealFixLenParam.h"
QT_FORWARD_DECLARE_CLASS(QAudioFormat)
QT_FORWARD_DECLARE_CLASS(QThread)
class FFTRealWrapper;
class SpectrumAnalyserThreadPrivate;
/**
* Implementation of the spectrum analysis which can be run in a
* separate thread.
*/
class SpectrumAnalyserThread : public QObject
{
Q_OBJECT
public:
SpectrumAnalyserThread(QObject *parent);
~SpectrumAnalyserThread();
public slots:
void setWindowFunction(WindowFunction type);
void calculateSpectrum(const QByteArray &buffer,
int inputFrequency,
int bytesPerSample);
signals:
void calculationComplete(const FrequencySpectrum &spectrum);
private:
void calculateWindow();
private:
FFTRealWrapper* m_fft;
const int m_numSamples;
WindowFunction m_windowFunction;
typedef FFTRealFixLenParam::DataType DataType;
QVector<DataType> m_window;
QVector<DataType> m_input;
QVector<DataType> m_output;
FrequencySpectrum m_spectrum;
#ifdef SPECTRUM_ANALYSER_SEPARATE_THREAD
QThread* m_thread;
#endif
};
/**
* Class which performs frequency spectrum analysis on a window of
* audio samples, provided to it by the Engine.
*/
class SpectrumAnalyser : public QObject
{
Q_OBJECT
public:
SpectrumAnalyser(QObject *parent = 0);
~SpectrumAnalyser();
public:
/*
* Set the windowing function which is applied before calculating the FFT
*/
void setWindowFunction(WindowFunction type);
/*
* Calculate a frequency spectrum
*
* \param buffer Audio data
* \param format Format of audio data
*
* Frequency spectrum is calculated asynchronously. The result is returned
* via the spectrumChanged signal.
*
* An ongoing calculation can be cancelled by calling cancelCalculation().
*
*/
void calculate(const QByteArray &buffer, const QAudioFormat &format);
/*
* Check whether the object is ready to perform another calculation
*/
bool isReady() const;
/*
* Cancel an ongoing calculation
*
* Note that cancelling is asynchronous.
*/
void cancelCalculation();
signals:
void spectrumChanged(const FrequencySpectrum &spectrum);
private slots:
void calculationComplete(const FrequencySpectrum &spectrum);
private:
void calculateWindow();
private:
SpectrumAnalyserThread* m_thread;
enum State {
Idle,
Busy,
Cancelled
};
State m_state;
};
#endif // SPECTRUMANALYSER_H
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