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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 SPECTRUMANALYSER_H
#define SPECTRUMANALYSER_H
#include <QByteArray>
#include <QObject>
#include <QVector>
#ifdef DUMP_SPECTRUMANALYSER
#include <QDir>
#include <QFile>
#include <QTextStream>
#endif
#include "frequencyspectrum.h"
#include "spectrum.h"
#ifndef DISABLE_FFT
#include "FFTRealFixLenParam.h"
#endif
QT_BEGIN_NAMESPACE
class QAudioFormat;
class QThread;
QT_END_NAMESPACE
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:
#ifndef DISABLE_FFT
FFTRealWrapper* m_fft;
#endif
const int m_numSamples;
WindowFunction m_windowFunction;
#ifdef DISABLE_FFT
typedef qreal DataType;
#else
typedef FFTRealFixLenParam::DataType DataType;
#endif
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();
#ifdef DUMP_SPECTRUMANALYSER
void setOutputPath(const QString &outputPath);
#endif
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;
#ifdef DUMP_SPECTRUMANALYSER
QDir m_outputDir;
int m_count;
QFile m_textFile;
QTextStream m_textStream;
#endif
};
#endif // SPECTRUMANALYSER_H
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