org.ocap.media.MediaPresentationEvent Maven / Gradle / Ivy
package org.ocap.media;
import javax.media.TransitionEvent;
import javax.media.Controller;
import org.davic.mpeg.ElementaryStream;
import org.ocap.net.OcapLocator;
/**
* MediaPresentationEvent is a JMF event used as the parent
* class of events indicating dynamic changes to the presentation of
* media components.
* This event provides the trigger that leads to the generation of
* this event.
*/
public abstract class MediaPresentationEvent extends TransitionEvent {
/**
* Constructor of MediaPresentationEvent
* @see javax.media.TransitionEvent
*/
protected MediaPresentationEvent(Controller from, int previous, int current, int target){
super(from,previous,current,target);
}
/**
* @return Returns true if the presented source is digital, false otherwise.
*/
public boolean isSourceDigital() {
return true;
}
/**
* @return Returns the URL of the source that is presented.
*/
public OcapLocator getSourceURL() {
return null;
}
/**
* @return Returns the service components that are currently presented.
* If no service components is presented or the source is analog, null is returned.
*/
public ElementaryStream[] getPresentedStreams() {
return null;
}
/**
* @return Returns the trigger that leads to the generation of a
* MediaPresentationEvent.
* @see MediaPresentationEvaluationTrigger
*/
public MediaPresentationEvaluationTrigger getTrigger() {
return null;
}
}