The MediaPlayer Class in Java

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The MediaPlayer Class
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In this example, the Media object has its autoPlay variable set to false, so playback does not begin until the MediaPlayer s start() function is called Lines 1 to 5 appear before this happens and, as you can see, it initially reports that it is paused On line 6, the Start button has been clicked and playback beginsThe status and paused variables change to reflect this fact Notice that the player is also reporting that it is buffering data On line 13, the Pause button has been clicked and the status and paused variables changed again Finally, on line 17, the Start button is clicked to resume playback The five function variables onBuffering, onEndOfMedia, onError, onRepeat, and onStalled can be used to receive notification of the corresponding events as playback proceedsYou might use these functions to display a message to indicate an error, or that media playback has been suspended because the player is stalled waiting for dataThe onBuffering function is called with a Duration value that indicates approximately how much playback data has been buffered, while onStalled is given a Duration that is an estimate of how long it will be before enough data will be available to allow playback to continueThe onError function receives a value of type MediaError that represents the error that has been encountered MediaError has an Integer variable called cause that gives the cause of the error and a String variable called message that provides a humanreadable reasonThe possible cause values can be found in the documentation for the MediaError class
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Synchronizing External Events with Playback
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Sometimes it is useful to be able to synchronize other parts of the user interface with the playback of video and audio An obvious example is an application that played back a video recording of a presentation and simultaneously displayed the speaker s slides, changing them to track the speaker s progressThe MediaPlayer class provides two ways to do this The most obvious way is to bind a local variable to the currentTime variable and then attach a trigger to that variableWhen the trigger fires, the next slide can be shown, if it is time to do so:
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var currentTime = bind mediaPlayercurrentTime on replace { // Switch slides if necessary, based on currentTime }
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The code required to switch slides would involve something like searching through a sequence of Durations to work out which slide should be visible at any given time Although it is not difficult to implement this, MediaPlayer has another feature that does this work for you it is possible to attach a sequence of callbacks to a MediaPlayer object, which will be automatically invoked at specified timesThe timers are of type MediaTimer and are attached to the MediaPlayer via its timers variableThe variables of this class are listed in Table 19-5
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19 Video and Audio
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Table 19-5 Variable
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time action
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Variables of the MediaTimer Class Type
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Duration function (:MediaTimer): Void
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The playback time at which this timer should fire The function to be called when the timer fires
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The time variable represents the playback time, not the elapsed timeThis means that the time during playback might be paused and is not counted, which is exactly what you want if you need to stay in synchronization with video playbackThe code in Listing 19-2 demonstrates the use of the MediaTimer class3
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Listing 19-2
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Using a MediaTimer
package javafxmedia; import import import import import import javafxscenemediaMedia; javafxscenemediaMediaPlayer; javafxscenemediaMediaTimer; javafxscenemediaMediaView; javafxsceneScene; javafxstageStage;
var mediaURL = "http://sunedgebossnet/download/sun/media/1460825906/" "1460825906_2956241001_big-buck-bunny-640x360flv"; var timers = [ MediaTimer { time: 10s action: function(t) {println("10s") }}, MediaTimer { time: 20s action: function(t) {println("20s") }}, MediaTimer { time: 30s action: function(t) {println("30s") }}, ]; Stage { title: "Media #7" resizable: false scene: Scene { width: 640 height: 400 content: [ MediaView {