The QCameraControl 类是用于控制静止摄像头 (或视频摄像机) 的类的抽象基类。 更多...
| 头： | #include <QCameraControl> |
| qmake: | QT += multimedia |
| 继承： | QMediaControl |
| enum | PropertyChangeType { CaptureMode, ImageEncodingSettings, VideoEncodingSettings, Viewfinder, ViewfinderSettings } |
| virtual | ~QCameraControl () |
| virtual bool | canChangeProperty (QCameraControl::PropertyChangeType changeType , QCamera::Status status ) const = 0 |
| virtual QCamera::CaptureModes | captureMode () const = 0 |
| virtual bool | isCaptureModeSupported (QCamera::CaptureModes mode ) const = 0 |
| virtual void | setCaptureMode (QCamera::CaptureModes mode ) = 0 |
| virtual void | setState (QCamera::State state ) = 0 |
| virtual QCamera::State | state () const = 0 |
| virtual QCamera::Status | status () const = 0 |
| void | captureModeChanged (QCamera::CaptureModes mode ) |
| void | error (int error , const QString & errorString ) |
| void | stateChanged (QCamera::State state ) |
| void | statusChanged (QCamera::Status status ) |
| const QMetaObject | staticMetaObject |
| QCameraControl (QObject * parent = nullptr) |
| QCameraControl_iid |
The QCameraControl 类是用于控制静止摄像头 (或视频摄像机) 的类的抽象基类。
此服务的提供是通过 QMediaService 对象凭借 QMediaService::control()。它被用于 QCamera .
接口名称对于
QCameraControl
is
org.qt-project.qt.cameracontrol/5.0
作为定义在
QCameraControl_iid
.
另请参阅 QMediaService::requestControl () 和 QCamera .
| 常量 | 值 | 描述 |
|---|---|---|
QCameraControl::CaptureMode
|
1
|
Indicates the capture mode is changed. |
QCameraControl::ImageEncodingSettings
|
2
|
Image encoder settings are changed, including resolution. |
QCameraControl::VideoEncodingSettings
|
3
|
Video encoder settings are changed, including audio, video and container settings. |
QCameraControl::Viewfinder
|
4
|
Viewfinder is changed. |
QCameraControl::ViewfinderSettings
|
5
|
Viewfinder settings are changed. |
[protected]
QCameraControl::
QCameraControl
(
QObject
*
parent
= nullptr)
Constructs a camera control object with parent .
[虚拟]
QCameraControl::
~QCameraControl
()
Destruct the camera control object.
[pure virtual]
bool
QCameraControl::
canChangeProperty
(
QCameraControl::PropertyChangeType
changeType
,
QCamera::Status
status
) const
Returns true if backend can effectively apply changing camera properties of changeType type while the camera state is QCamera::Active and camera status matches status 参数。
If backend doesn't support applying this change in the active state, it will be stopped before the settings are changed and restarted after. Otherwise the backend should apply the change in the current state, with the camera status indicating the progress, if necessary.
[pure virtual]
QCamera::CaptureModes
QCameraControl::
captureMode
() const
Returns the current capture mode.
另请参阅 setCaptureMode ().
[signal]
void
QCameraControl::
captureModeChanged
(
QCamera::CaptureModes
mode
)
Signal emitted when the camera capture mode 改变。
[signal]
void
QCameraControl::
error
(
int
error
, const
QString
&
errorString
)
Signal emitted when an error occurs with error code error and a description of the error errorString .
[pure virtual]
bool
QCameraControl::
isCaptureModeSupported
(
QCamera::CaptureModes
mode
) const
Returns true if the capture mode is suported.
[pure virtual]
void
QCameraControl::
setCaptureMode
(
QCamera::CaptureModes
mode
)
Sets the current capture mode .
The capture mode changes are synchronous and allowed in any camera state.
If the capture mode is changed while camera is active, it's recommended to change status to QCamera::LoadedStatus and start activating the camera in the next event loop with the status changed to QCamera::StartingStatus . This allows the capture settings to be applied before camera is started. Than change the status to QCamera::StartedStatus when the capture mode change is done.
另请参阅 captureMode ().
[pure virtual]
void
QCameraControl::
setState
(
QCamera::State
state
)
Sets the camera state .
State changes are synchronous and indicate user intention, while camera status is used as a feedback mechanism to inform application about backend status. Status changes are reported asynchronously with QCameraControl::statusChanged () 信号。
另请参阅 state () 和 QCamera::State .
[pure virtual]
QCamera::State
QCameraControl::
state
() const
Returns the state of the camera service.
另请参阅 setState () 和 QCamera::state .
[signal]
void
QCameraControl::
stateChanged
(
QCamera::State
state
)
Signal emitted when the camera state 改变。
In most cases the state chage is caused by QCameraControl::setState (), but if critical error has occurred the state changes to QCamera::UnloadedState .
[pure virtual]
QCamera::Status
QCameraControl::
status
() const
Returns the status of the camera service.
另请参阅 QCamera::state .
[signal]
void
QCameraControl::
statusChanged
(
QCamera::Status
status
)
Signal emitted when the camera status 改变。
org.qt-project.qt.cameracontrol/5.0
定义接口名为 QCameraControl 类。