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java.lang.Objectcom.trolltech.qt.QSignalEmitter
com.trolltech.qt.QtJambiObject
com.trolltech.qt.phonon.MediaNode
public final class MediaNode
The MediaNode
class is the base class for all nodes in a media graph. In all phonon applications, one builds a media graph consisting of MediaNodes
. The graph will take multimedia content, e.g., from a file, as input. After its nodes have processed the multimedia, the graph will output the media again, e.g., to a sound card.
The multimedia content is streamed over Path
s between the nodes in the graph. You can query the paths that are connected to a media node with inputPaths()
and outputPaths()
.
You can check whether the node is implemented by the current backend by calling isValid()
. This does not guarantee that an instance of the class works as expected, but that the backend has implemented functionality for the class.
Currently, Phonon has three media nodes: MediaObject
, AudioOutput
, and VideoWidget
. Please refer to their class descriptions for details about their usage, and to find out which nodes can be connected to each other. See also Building Graphs in Phonon's overview document.
Two nodes are connected to each other using the Phonon::createPath() function. We show a code example below, in which we build a media graph for video playback and then query its media nodes for their Path
s:
The following code example is written in c++.
Phonon::MediaObject *mediaObject = new Phonon::MediaObject; Phonon::AudioOutput *audioOutput = new Phonon::AudioOutput; Phonon::VideoWidget *videoWidget = new Phonon::VideoWidget; Phonon::createPath(mediaObject, audioOutput); Phonon::createPath(mediaObject, videoWidget); QList<Phonon::Path> inputPaths = audioOutput->inputPaths(); // inputPaths = [ mediaObject ] QList<Phonon::Path> outputPaths = mediaObject->outputPaths(); // outputPaths = [ audioOutput, videoWidget ]When you create a Phonon application, you will likely build the graph yourself. This makes
isValid()
the most useful function of this class. The other two functions help navigate the graph, which you do not need to do as you created the nodes yourself. Phonon::MediaObject
, Phonon::AudioOutput
, and Phonon::VideoWidget
.
Nested Class Summary |
---|
Nested classes/interfaces inherited from class com.trolltech.qt.QSignalEmitter |
---|
QSignalEmitter.Signal0, QSignalEmitter.Signal1, QSignalEmitter.Signal2, QSignalEmitter.Signal3, QSignalEmitter.Signal4, QSignalEmitter.Signal5, QSignalEmitter.Signal6, QSignalEmitter.Signal7, QSignalEmitter.Signal8, QSignalEmitter.Signal9 |
Method Summary | |
---|---|
static MediaNode |
fromNativePointer(QNativePointer nativePointer)
|
java.util.List |
inputPaths()
Returns the paths that inputs multimedia to this media node. |
boolean |
isValid()
Returns true if the backend provides an implementation of this class; otherwise returns false. |
java.util.List |
outputPaths()
Returns the paths to which this media node output media. |
Methods inherited from class com.trolltech.qt.QtJambiObject |
---|
dispose, disposed, equals, finalize, reassignNativeResources, tr, tr, tr |
Methods inherited from class com.trolltech.qt.QSignalEmitter |
---|
blockSignals, disconnect, disconnect, signalsBlocked, signalSender, thread |
Methods inherited from class java.lang.Object |
---|
clone, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Methods inherited from interface com.trolltech.qt.QtJambiInterface |
---|
disableGarbageCollection, nativeId, nativePointer, reenableGarbageCollection, setJavaOwnership |
Method Detail |
---|
public final java.util.List inputPaths()
outputPaths()
.
public final boolean isValid()
This does not guarantee that instances of the class works as expected, but that the backend has implemented the functionality for this class. For instance, Qt's GStreamer
backend will return true for instances of the AudioOutput
class, even if there is a problem with GStreamer
and it could not play sound.
public final java.util.List outputPaths()
inputPaths()
.
public static MediaNode fromNativePointer(QNativePointer nativePointer)
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