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#include <QPixmap>

#include <QWidget>

#include <QObject>

#include <QMainWindow>

#include <QPushButton>

#include <QComboBox>

#include <QByteArray>

#include <qaudioinput.h>

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;

    quint16 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 notified();

    void readMore();

    void toggleMode();

    void toggleSuspend();

    void stateChanged(QAudio::State state);

    void deviceChanged(int index);

private:

    // Owned by layout

    RenderArea *m_canvas;

    QPushButton *m_modeButton;

    QPushButton *m_suspendResumeButton;

    QComboBox *m_deviceBox;

    AudioInfo *m_audioInfo;

    QAudioFormat m_format;

    QAudioInput *m_audioInput;

    QIODevice *m_input;

    bool m_pullMode;

    QByteArray m_buffer;

    static const QString PushModeLabel;

    static const QString PullModeLabel;

    static const QString SuspendLabel;

    static const QString ResumeLabel;

};