audioinput.h Example File

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#ifndef AUDIOINPUT_H
#define AUDIOINPUT_H
#include <QAudioInput>
#include <QByteArray>
#include <QComboBox>
#include <QMainWindow>
#include <QObject>
#include <QPixmap>
#include <QPushButton>
#include <QSlider>
#include <QWidget>
class AudioInfo : public QIODevice
{
    Q_OBJECT
public:
    AudioInfo(const QAudioFormat &format, QObject *parent);
    ~AudioInfo();
    void start();
    void stop();
    qreal level() const { return m_level; }
    qint64 readData(char *data, qint64 maxlen) override;
    qint64 writeData(const char *data, qint64 len) override;
private:
    const QAudioFormat m_format;
    quint32 m_maxAmplitude;
    qreal m_level; // 0.0 <= m_level <= 1.0
signals:
    void update();
};
class RenderArea : public QWidget
{
    Q_OBJECT
public:
    RenderArea(QWidget *parent = 0);
    void setLevel(qreal value);
protected:
    void paintEvent(QPaintEvent *event) override;
private:
    qreal m_level;
    QPixmap m_pixmap;
};
class InputTest : public QMainWindow
{
    Q_OBJECT
public:
    InputTest();
    ~InputTest();
private:
    void initializeWindow();
    void initializeAudio();
    void createAudioInput();
private slots:
    void refreshDisplay();
    void readMore();
    void toggleMode();
    void toggleSuspend();
    void deviceChanged(int index);
    void sliderChanged(int value);
private:
    // Owned by layout
    RenderArea *m_canvas;
    QPushButton *m_modeButton;
    QPushButton *m_suspendResumeButton;
    QComboBox *m_deviceBox;
    QSlider *m_volumeSlider;
    QAudioDeviceInfo m_device;
    AudioInfo *m_audioInfo;
    QAudioFormat m_format;
    QAudioInput *m_audioInput;
    QIODevice *m_input;
    bool m_pullMode;
    QByteArray m_buffer;
};
#endif // AUDIOINPUT_H