QtGStreamer  1.2.0
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QGst::Message Class Reference

#include <QGst/Message>

Inheritance diagram for QGst::Message:
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Collaboration diagram for QGst::Message:
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Public Member Functions

ObjectPtr source () const
 
quint64 timestamp () const
 
QString typeName () const
 
MessageType type () const
 
StructureConstPtr internalStructure ()
 
quint32 sequenceNumber () const
 
void setSequenceNumber (quint32 num)
 
- Public Member Functions inherited from QGst::MiniObject
MiniObjectPtr copy () const
 
bool isWritable () const
 
MiniObjectPtr makeWritable () const
 

Additional Inherited Members

- Public Types inherited from QGst::MiniObject
typedef GstMiniObject CType
 
- Protected Member Functions inherited from QGst::MiniObject
 MiniObject (const MiniObject &)
 
MiniObjectoperator= (const MiniObject &)
 
virtual void ref (bool increaseRef)
 
virtual void unref ()
 
- Protected Member Functions inherited from QGlib::RefCountedObject
template<class T >
T * object () const
 
- Protected Attributes inherited from QGlib::RefCountedObject
void * m_object
 

Detailed Description

Wrapper class for GstMessage.

Messages are lightweight objects to signal the application of pipeline events. They are posted by objects in the pipeline and are passed to the application using the Bus.

Messages are implemented as a subclass of MiniObject with a generic GstStructure as the content. This allows for writing custom messages without requiring an API change while allowing a wide range of different types of messages.

In these bindings, for convenience, each message type has its own Message subclass. This does not reflect 1-1 the native C API, where there is only one Message class with tens of 'new_foo' and 'parse_foo' methods. You can use RefPointer::dynamicCast() to cast a MessagePtr to a RefPointer of one of the Message subclasses and it will behave as expected (i.e. it will only succeed if the message type matches the message type that the subclass handles). Note however that the Message subclasses cannot be used with Value::get(), since a GValue will actually contain a GstMessage (the subclasses do not exist in C) and Value::get() is not able to do dynamic casts. As a result of that, Message subclasses also cannot be used as arguments in slots connected to GObject signals, even though you may know that your slot will only be called with that type of message.

Definition at line 48 of file message.h.


The documentation for this class was generated from the following files: