QCameraViewfinderSettingsControl Class
The QCameraViewfinderSettingsControl class provides an abstract class for controlling camera viewfinder parameters. 更多...
| 头文件: | #include <QCameraViewfinderSettingsControl> |
| qmake: | QT += multimedia |
| 基类: | QMediaControl |
公有类型
| enum | ViewfinderParameter { Resolution, PixelAspectRatio, MinimumFrameRate, MaximumFrameRate, PixelFormat, UserParameter } |
公有函数
| ~QCameraViewfinderSettingsControl() | |
| virtual bool | isViewfinderParameterSupported(ViewfinderParameter parameter) const = 0 |
| virtual void | setViewfinderParameter(ViewfinderParameter parameter, const QVariant &value) = 0 |
| virtual QVariant | viewfinderParameter(ViewfinderParameter parameter) const = 0 |
- 32 个公有函数继承自 QObject
受保护的函数
| QCameraViewfinderSettingsControl(QObject *parent = Q_NULLPTR) |
- 9 个受保护的函数继承自 QObject
Macros
其他继承的成员
- 1 个属性继承自 QObject
- 1 个公有槽函数继承自 QObject
- 2 个信号继承自 QObject
- 1 个公有变量继承自 QObject
- 10 个静态公有成员继承自 QObject
- 2 个受保护的变量继承自 QObject
详细描述
The QCameraViewfinderSettingsControl class provides an abstract class for controlling camera viewfinder parameters.
The interface name of QCameraViewfinderSettingsControl is org.qt-project.qt.cameraviewfindersettingscontrol/5.0 as defined in QCameraViewfinderSettingsControl_iid.
Warning: New backends should implement QCameraViewfinderSettingsControl2 instead. Application developers should request this control only if QCameraViewfinderSettingsControl2 is not available.
参见 QMediaService::requestControl(), QCameraViewfinderSettingsControl2, and QCamera.
成员类型
enum QCameraViewfinderSettingsControl::ViewfinderParameter
| Constant | Value | Description |
|---|---|---|
QCameraViewfinderSettingsControl::Resolution | 0 | Viewfinder resolution, QSize. |
QCameraViewfinderSettingsControl::PixelAspectRatio | 1 | Pixel aspect ratio, QSize as in QVideoSurfaceFormat::pixelAspectRatio |
QCameraViewfinderSettingsControl::MinimumFrameRate | 2 | Minimum viewfinder frame rate, qreal |
QCameraViewfinderSettingsControl::MaximumFrameRate | 3 | Maximum viewfinder frame rate, qreal |
QCameraViewfinderSettingsControl::PixelFormat | 4 | Viewfinder pixel format, QVideoFrame::PixelFormat |
QCameraViewfinderSettingsControl::UserParameter | 1000 | The base value for platform specific extended parameters. For such parameters the sequential values starting from UserParameter should be used. |
成员函数
[protected] QCameraViewfinderSettingsControl::QCameraViewfinderSettingsControl(QObject *parent = Q_NULLPTR)
Constructs a camera viewfinder control object with parent.
QCameraViewfinderSettingsControl::~QCameraViewfinderSettingsControl()
Destroys the camera viewfinder control object.
[pure virtual] bool QCameraViewfinderSettingsControl::isViewfinderParameterSupported(ViewfinderParameter parameter) const
Returns true if configuration of viewfinder parameter is supported by camera backend.
[pure virtual] void QCameraViewfinderSettingsControl::setViewfinderParameter(ViewfinderParameter parameter, const QVariant &value)
Set the prefferred value of viewfinder parameter.
Calling this while the camera is active may result in the camera being stopped and reloaded. If video recording is in progress, this call may be ignored.
If an unsupported parameter is specified the camera may fail to load, or the setting may be ignored.
Viewfinder parameters may also depend on other camera settings, especially in video capture mode. If camera configuration conflicts with viewfinder settings, the camara configuration is usually preferred.
参见 viewfinderParameter().
[pure virtual] QVariant QCameraViewfinderSettingsControl::viewfinderParameter(ViewfinderParameter parameter) const
Returns the value of viewfinder parameter.
参见 setViewfinderParameter().
宏
QCameraViewfinderSettingsControl_iid
org.qt-project.qt.cameraviewfindersettingscontrol/5.0
Defines the interface name of the QCameraViewfinderSettingsControl class.