QMediaService Class
The QMediaService class provides a common base class for media service implementations. 更多...
| 头文件: | #include <QMediaService> |
| qmake: | QT += multimedia |
| 基类: | QObject |
公有函数
| ~QMediaService() | |
| virtual void | releaseControl(QMediaControl *control) = 0 |
| virtual QMediaControl * | requestControl(const char *interface) = 0 |
| T | requestControl() |
- 32 个公有函数继承自 QObject
受保护的函数
| QMediaService(QObject *parent) |
- 9 个受保护的函数继承自 QObject
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 QMediaService class provides a common base class for media service implementations.
Media services provide implementations of the functionality promised by media objects, and allow multiple providers to implement a QMediaObject.
To provide the functionality of a QMediaObject media services implement QMediaControl interfaces. Services typically implement one core media control which provides the core feature of a media object, and some number of additional controls which provide either optional features of the media object, or features of a secondary media object or peripheral object.
A pointer to media service's QMediaControl implementation can be obtained by passing the control's interface name to the requestControl() function.
QMediaPlayerControl *control = qobject_cast<QMediaPlayerControl *>( mediaService->requestControl("org.qt-project.qt.mediaplayercontrol/5.0"));
Media objects can use services loaded dynamically from plug-ins or implemented statically within an applications. Plug-in based services should also implement the QMediaServiceProviderPlugin interface. Static services should implement the QMediaServiceProvider interface. In general, implementing a QMediaService is outside of the scope of this documentation and support on the relevant mailing lists or IRC channels should be sought.
参见 QMediaObject and QMediaControl.
成员函数
[protected] QMediaService::QMediaService(QObject *parent)
Construct a media service with the given parent. This class is meant as a base class for Multimedia services so this constructor is protected.
QMediaService::~QMediaService()
Destroys a media service.
[pure virtual] void QMediaService::releaseControl(QMediaControl *control)
Releases a control back to the service.
[pure virtual] QMediaControl *QMediaService::requestControl(const char *interface)
Returns a pointer to the media control implementing interface.
If the service does not implement the control, or if it is unavailable a null pointer is returned instead.
Controls must be returned to the service when no longer needed using the releaseControl() function.
T QMediaService::requestControl()
Returns a pointer to the media control of type T implemented by a media service.
If the service does not implement the control, or if it is unavailable a null pointer is returned instead.
Controls must be returned to the service when no longer needed using the releaseControl() function.