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#include <math.h>

#include <QObject>

#include <QMainWindow>

#include <QIODevice>

#include <QTimer>

#include <QPushButton>

#include <QComboBox>

#include <QByteArray>

#include <QAudioOutput>

class Generator : public QIODevice

{

    Q_OBJECT

public:

    Generator(const QAudioFormat &format, qint64 durationUs, int frequency, QObject *parent);

    ~Generator();

    void start();

    void stop();

    qint64 readData(char *data, qint64 maxlen);

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

    qint64 bytesAvailable() const;

private:

    void generateData(const QAudioFormat &format, qint64 durationUs, int frequency);

private:

    qint64 m_pos;

    QByteArray m_buffer;

};

class AudioTest : public QMainWindow

{

    Q_OBJECT

public:

    AudioTest();

    ~AudioTest();

private:

    void initializeWindow();

    void initializeAudio();

    void createAudioOutput();

private:

    QTimer*          m_pullTimer;

    // Owned by layout

    QPushButton*     m_modeButton;

    QPushButton*     m_suspendResumeButton;

    QComboBox*       m_deviceBox;

    QAudioDeviceInfo m_device;

    Generator*       m_generator;

    QAudioOutput*    m_audioOutput;

    QIODevice*       m_output; // not owned

    QAudioFormat     m_format;

    bool             m_pullMode;

    QByteArray       m_buffer;

    static const QString PushModeLabel;

    static const QString PullModeLabel;

    static const QString SuspendLabel;

    static const QString ResumeLabel;

private slots:

    void notified();

    void pullTimerExpired();

    void toggleMode();

    void toggleSuspendResume();

    void stateChanged(QAudio::State state);

    void deviceChanged(int index);

};