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Thread: Problem with java media framework

  1. #1
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    Default Problem with java media framework

    This is my code that plays the audio files:

    /**
     * Author: audioPlayer
     * Project: DesktopApp
     */
     
    package appClass;
     
    import java.io.File;
    import java.io.IOException;
    import javax.media.*;
    import javax.media.format.AudioFormat;
     
    public class audioPlayer {
     
        private Player[] player;
        private Format in1;
        private Format in2;
        private Format out;
        private int filePlaying;
     
        public audioPlayer(){
     
        }
     
        public void loadAudio(File[] file){
            in1 = new AudioFormat(AudioFormat.MPEGLAYER3);
            in2 = new AudioFormat(AudioFormat.MPEG);
            out = new AudioFormat(AudioFormat.LINEAR);
            PlugInManager.addPlugIn(
                    "com.sun.media.codec.audio.mp3.JavaDecoder",
                    new Format[]{in1, in2},
                    new Format[]{out},
                    PlugInManager.CODEC
            );
            try{
     
                for(int i = 0; i<file.length; i++){
                    MediaLocator mL = new MediaLocator(file[i].toURI().toURL()); 
                    System.out.print(file[i].toURI().toURL());
     
                    //ERROR POINTS HERE
                    player[i]= Manager.createPlayer(mL);                
     
     
                }
            }
            catch(IOException | NoPlayerException e){
                e.printStackTrace();
            }
        }
     
        public void playSound(int fileCount){
                player[fileCount].start();
                filePlaying = fileCount;
        }
     
        public void stopSound(){
            if(player[filePlaying]!=null){
                player[filePlaying].stop();
            }
        }
     
    }

    and that was called by this:

    aP.loadAudio(mM.getFiles());

    mM is a class that gets all the audioFiles from a certain directory

    here:

     
        private String path = System.getProperty("user.home")+"\\Music";
     
        private File[] file;
     
        public File[] getFiles(){
            return file;
        }
     
        public String getPath(){
            return path;
        }
     
        private FileFilter audioFiles = new FileFilter(){
     
            @Override
            public boolean accept(File file) {
                return file.getName().endsWith(".mp3") || file.getName().endsWith(".MP3") || file.getName().endsWith(".WAV") || file.getName().endsWith(".wav");
            }
     
        };
     
        public void loadFiles(){        
            File folder = new File(path);
            file = folder.listFiles(audioFiles);
        }

    but it keeps saying that my file is a null but when i printed whats the name of the file, it is not null it has name like a real mp3 file...

    jmf.jpg

    My Goal:

    I want to array the Player because when it is not arrayed, and when i try to play a file, it loads the file first before playing it and it takes 1-3 seconds which is not good. I tried to do this hoping it wouldn't load and when i try to play another file it plays instantly.


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Problem with java media framework

    it keeps saying that my file is a null
    Please copy the full text of the error message and post it here.

    What variable has the null value? Backtrack in the code to see why that variable does not have a valid value.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: Problem with java media framework

    MediaLocator mL = new MediaLocator(file[i].toURI().toURL()); 
    System.out.print(file[i].toURI().toURL());
     
    //ERROR POINTS HERE
    player[i]= Manager.createPlayer(mL);
    full code is on the top


    Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
    	at appClass.audioPlayer.loadAudio(audioPlayer.java:41)
    	at gui.wallpaperPanel.btnMyMusicActionPerformed(wallpaperPanel.java:426)
    	at gui.wallpaperPanel.access$300(wallpaperPanel.java:18)
    	at gui.wallpaperPanel$4.actionPerformed(wallpaperPanel.java:196)
    	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
    	at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
    	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
    	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
    	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
    	at java.awt.Component.processMouseEvent(Component.java:6505)
    	at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
    	at java.awt.Component.processEvent(Component.java:6270)
    	at java.awt.Container.processEvent(Container.java:2229)
    	at java.awt.Component.dispatchEventImpl(Component.java:4861)
    	at java.awt.Container.dispatchEventImpl(Container.java:2287)
    	at java.awt.Component.dispatchEvent(Component.java:4687)
    	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
    	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
    	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
    	at java.awt.Container.dispatchEventImpl(Container.java:2273)
    	at java.awt.Window.dispatchEventImpl(Window.java:2719)
    	at java.awt.Component.dispatchEvent(Component.java:4687)
    	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:729)
    	at java.awt.EventQueue.access$200(EventQueue.java:103)
    	at java.awt.EventQueue$3.run(EventQueue.java:688)
    	at java.awt.EventQueue$3.run(EventQueue.java:686)
    	at java.security.AccessController.doPrivileged(Native Method)
    	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
    	at java.awt.EventQueue$4.run(EventQueue.java:702)
    	at java.awt.EventQueue$4.run(EventQueue.java:700)
    	at java.security.AccessController.doPrivileged(Native Method)
    	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    	at java.awt.EventQueue.dispatchEvent(EventQueue.java:699)
    	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
    	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
    	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
    	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
    	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
    	at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
    BUILD SUCCESSFUL (total time: 6 seconds)

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: Problem with java media framework

    What variable has the null value? Why doesn't that variable have a valid value?
    If you don't understand my answer, don't ignore it, ask a question.

  5. #5
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    Default Re: Problem with java media framework

    i think the null value is the MediaLocator saying i cant see the file, but i printed the value of the file, it has. I dont know why it was invalid, i was doing it a while ago (no arrays on Players) and it was doing right.

  6. #6
    Super Moderator Norm's Avatar
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    Default Re: Problem with java media framework

    Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
    at appClass.audioPlayer.loadAudio(audioPlayer.java:41 )
    Print the values of all the variables used on line 41 to see which one has the null value.
    If you don't understand my answer, don't ignore it, ask a question.

  7. #7
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    Default Re: Problem with java media framework

    Quote Originally Posted by Norm View Post
    Print the values of all the variables used on line 41 to see which one has the null value.
    please look at my attachment, it was been there since this thread was started, and if you dont want to, it has value and it contradicts to the output saying it is null

  8. #8
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    Default Re: Problem with java media framework

    What was printed out when you added a println() statement to print out the values of the variables used on line 41? Which variable on that line has a null value? To solve this kind of error you need to find what variable is null and change the code so it has a valid value.
    If you don't understand my answer, don't ignore it, ask a question.

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