widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QDebug>
#include <QtTest/QTest>

#include <Windows.h>
#include <mmdeviceapi.h>
#include <devicetopology.h>
#include <Ksmedia.h>


namespace Ui {
class Widget;
}

class Widget : public QWidget
{
    Q_OBJECT

public:
    explicit Widget(QWidget *parent = 0);
    ~Widget();

private slots:
    void on_hSlider_Front_valueChanged(int value);

    void on_hSlider_Rear_valueChanged(int value);

    void on_hSlider_Sub_valueChanged(int value);

    void on_hSlider_Center_valueChanged(int value);

    void on_hSlider_Side_valueChanged(int value);

private:
    Ui::Widget *ui;

    HRESULT _hr;

    IMMDeviceEnumerator *_pDeviceEnumerator;
    IMMDevice *_pDefaultDevice;

    IDeviceTopology *_pDeviceTopology;
    IConnector *_pConnectorFrom;
    IConnector *_pConnectorTo;
    IPart *_pPart;
    IAudioVolumeLevel *_pAudioVolumeLevelFront;
    IAudioVolumeLevel *_pAudioVolumeLevelRear;
    IAudioVolumeLevel *_pAudioVolumeLevelSubwoofer;
    IAudioVolumeLevel *_pAudioVolumeLevelCenter;
    IAudioVolumeLevel *_pAudioVolumeLevelSide;

    float dbToPercent(float value);
    float percentToDb(float value);

    bool _isAppLoading;

protected:
    void showEvent(QShowEvent *);
};

#endif // WIDGET_H