widget.cpp Example File | Qt Charts 5.12.11

- Qt 5.12
- Qt Charts
- Audio Example
- widget.cpp Example File
- Qt Charts | Commercial or GPLv3

# widget.cpp Example File

audio/widget.cpp

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     ** Contact: https://www.qt.io/licensing/
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     #include "widget.h"
     #include "xyseriesiodevice.h"

     #include <QtMultimedia/QAudioDeviceInfo>
     #include <QtMultimedia/QAudioInput>

     #include <QtCharts/QChartView>
     #include <QtCharts/QLineSeries>
     #include <QtCharts/QChart>
     #include <QtCharts/QValueAxis>

     #include <QtWidgets/QVBoxLayout>

     QT_CHARTS_USE_NAMESPACE

     Widget::Widget(const QAudioDeviceInfo &deviceInfo, QWidget *parent) :
         QWidget(parent),
         m_chart(new QChart),
         m_series(new QLineSeries)
     {
         QChartView *chartView = new QChartView(m_chart);
         chartView->setMinimumSize(800, 600);
         m_chart->addSeries(m_series);
         QValueAxis *axisX = new QValueAxis;
         axisX->setRange(0, XYSeriesIODevice::sampleCount);
         axisX->setLabelFormat("%g");
         axisX->setTitleText("Samples");
         QValueAxis *axisY = new QValueAxis;
         axisY->setRange(-1, 1);
         axisY->setTitleText("Audio level");
         m_chart->addAxis(axisX, Qt::AlignBottom);
         m_series->attachAxis(axisX);
         m_chart->addAxis(axisY, Qt::AlignLeft);
         m_series->attachAxis(axisY);
         m_chart->legend()->hide();
         m_chart->setTitle("Data from the microphone (" + deviceInfo.deviceName() + ')');

         QVBoxLayout *mainLayout = new QVBoxLayout(this);
         mainLayout->addWidget(chartView);

         QAudioFormat formatAudio;
         formatAudio.setSampleRate(8000);
         formatAudio.setChannelCount(1);
         formatAudio.setSampleSize(8);
         formatAudio.setCodec("audio/pcm");
         formatAudio.setByteOrder(QAudioFormat::LittleEndian);
         formatAudio.setSampleType(QAudioFormat::UnSignedInt);

         m_audioInput = new QAudioInput(deviceInfo, formatAudio, this);

         m_device = new XYSeriesIODevice(m_series, this);
         m_device->open(QIODevice::WriteOnly);

         m_audioInput->start(m_device);
     }

     Widget::~Widget()
     {
         m_audioInput->stop();
         m_device->close();
     }