qt-everywhere-src-5.15.1/qtmultimedia/src/plugins/directshow/camera/directshowcameraexposurecontrol.h

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#ifndef DIRECTSHOWCAMERAEXPOSURECONTROL_H
#define DIRECTSHOWCAMERAEXPOSURECONTROL_H

#include <QtMultimedia/qcameraexposurecontrol.h>

struct IAMCameraControl;

QT_BEGIN_NAMESPACE

class DSCameraSession;

class DirectShowCameraExposureControl : public QCameraExposureControl
{
    Q_OBJECT
public:
    DirectShowCameraExposureControl(DSCameraSession *session);

    bool isParameterSupported(ExposureParameter parameter) const override;
    QVariantList supportedParameterRange(ExposureParameter parameter, bool *continuous) const override;
    QVariant requestedValue(ExposureParameter parameter) const override;
    QVariant actualValue(ExposureParameter parameter) const override;
    bool setValue(ExposureParameter parameter, const QVariant &value) override;

private Q_SLOTS:
    void onStatusChanged(QCamera::Status status);

private:
    DSCameraSession *m_session;

    struct ExposureValues
    {
        long caps;
        long minValue;
        long maxValue;
        long stepping;
        long defaultValue;
    } m_shutterSpeedValues, m_apertureValues;

    qreal m_requestedShutterSpeed;
    qreal m_currentShutterSpeed;

    qreal m_requestedAperture;
    qreal m_currentAperture;

    QVariantList m_supportedShutterSpeeds;
    QVariantList m_supportedApertureValues;
    QVariantList m_supportedExposureModes;

    QCameraExposure::ExposureMode m_requestedExposureMode;
    QCameraExposure::ExposureMode m_currentExposureMode;

    void updateExposureSettings();

    bool setShutterSpeed(IAMCameraControl *cameraControl, qreal shutterSpeed);
    bool setAperture(IAMCameraControl *cameraControl, qreal aperture);
    bool setExposureMode(IAMCameraControl *cameraControl, QCameraExposure::ExposureMode mode);
};

QT_END_NAMESPACE

#endif // DIRECTSHOWCAMERAEXPOSURECONTROL_H