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);
      qint64 writeData(const char *data, qint64 len);

  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);

  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