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/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** 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 Digia Plc 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."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "q3dbars.h"
#include "engine.h"
#include "utils.h"
#include <QGuiApplication>
#include <QAudio>
using namespace QtDataVis3D;
class MainApp : public QObject
{
public:
MainApp(Q3DBars *window);
~MainApp();
void start();
public slots:
void spectrumChanged(qint64 position, qint64 length,
const FrequencySpectrum &spectrum);
void stateChanged(QAudio::Mode mode, QAudio::State state);
private:
int barIndex(qreal frequency) const;
private:
Q3DBars *m_chart;
Engine *m_engine;
int m_infoMessageTimerId;
// Lower bound of first band in the spectrum in Hz
qreal m_lowFreq;
// Upper band of last band in the spectrum in Hz
qreal m_highFreq;
};
MainApp::MainApp(Q3DBars *window)
: m_chart(window)
, m_engine(new Engine(this))
, m_lowFreq(0.0)
, m_highFreq(1000.0)
{
m_chart->setupSampleSpace(QPoint(SpectrumNumBands, SpectrumNumBands*2));
m_chart->setBarSpecs(QPointF(1.0f, 1.0f), QPointF(0.2f, 0.1f));
m_chart->setBarType(Q3DBars::Bars, false);
}
MainApp::~MainApp()
{
}
void MainApp::start()
{
// create all necessary objects & connect signals
QObject::connect(m_engine, &Engine::changedSpectrum, this, &MainApp::spectrumChanged);
QObject::connect(m_engine, &Engine::stateChanged, this, &MainApp::stateChanged);
m_engine->loadFile(QStringLiteral(":/file1"));
m_engine->startPlayback();
}
//-----------------------------------------------------------------------------
// Public slots
//-----------------------------------------------------------------------------
void MainApp::spectrumChanged(qint64 position, qint64 length, const FrequencySpectrum &spectrum)
{
Q_UNUSED(position);
Q_UNUSED(length);
//qDebug() << "updating bar values" << position << length;
QVector<float> data;
for (int bar = 0; bar < SpectrumNumBands; bar++) {
// init data set
data.append(0.0f);
}
FrequencySpectrum::const_iterator i = spectrum.begin();
const FrequencySpectrum::const_iterator end = spectrum.end();
for ( ; i != end; ++i) {
const FrequencySpectrum::Element e = *i;
if (e.frequency >= m_lowFreq && e.frequency < m_highFreq) {
data.replace(barIndex(e.frequency)
, qMax(data.at(barIndex(e.frequency)), (float)e.amplitude));
}
}
if (data.size() > 0)
m_chart->addDataSet(data);
}
void MainApp::stateChanged(QAudio::Mode mode, QAudio::State state)
{
qDebug() << "mode:" << mode << " state: " << state;
// Restart once playback is finished
if (QAudio::AudioOutput == mode && QAudio::StoppedState == state) {
// TODO: Doesn't work yet -> DEBUG
m_engine->reset();
// TODO: Change song each time?
m_engine->loadFile(QStringLiteral(":/file1"));
m_engine->startPlayback();
}
}
//-----------------------------------------------------------------------------
// Private functions
//-----------------------------------------------------------------------------
int MainApp::barIndex(qreal frequency) const
{
Q_ASSERT(frequency >= m_lowFreq && frequency < m_highFreq);
const qreal bandWidth = (m_highFreq - m_lowFreq) / SpectrumNumBands;
const int index = (frequency - m_lowFreq) / bandWidth;
if (index < 0 || index >= SpectrumNumBands)
Q_ASSERT(false);
//qDebug() << "insert to" << index;
return index;
}
//-----------------------------------------------------------------------------
// main
//-----------------------------------------------------------------------------
int main(int argc, char *argv[])
{
QGuiApplication app(argc, argv);
app.setApplicationName("QtDataVis3D spectrum analyzer");
Q3DBars window;
window.resize(1024, 768);
window.show();
MainApp *mainApp = new MainApp(&window);
mainApp->start();
return app.exec();
}
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