Invalid format error

[Marco da Vinha]

Hi there! I'm still pretty new to coding. I've done a free online basic intro to Java and decided to follow a tutorial on how to make a basic media player from another site. I've followed everything on the tutorial, but for some reason, when I try to play the WAV file it throws the exception Invalid Format. Can anyone clue me in on what might be wrong? Thanks!

PS - Ignore the comments, as I wrote them as I went a long to understand what is going on with each line.

package player;

import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.BorderLayout;
import java.awt.Font;
import java.io.File;

import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.Clip;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.filechooser.FileNameExtensionFilter;

public class MediaPlayer extends JPanel implements ActionListener {
	JFrame window = new JFrame("The Vine");
	JLabel info = new JLabel("Simple media player");
	JButton addButton = new JButton("Load");
	JButton playButton = new JButton("Play");
	JButton stopButton = new JButton("Stop");
	Font custFont = new Font("", Font.BOLD, 20);
	JComboBox list = new JComboBox(); // create a menu
	JFileChooser browser = new JFileChooser(); // to load files
	FileNameExtensionFilter filter = new FileNameExtensionFilter("WAV Sound",
			"wav"); // filters file looked for
	int returnValue;
	String[] music = new String[10]; // says name of tracks
	int index = 0; // counts tracks
	File selectFile; // not sure what this does
	File sound;
	AudioInputStream ais;
	Clip clip;

	// Constructor
	MediaPlayer() {

		this.setBackground(Color.GREEN); // why is it here? move around to see
											// how position affects program
		window.add(this); // "this" adds JPanel to the window

		addButton.setFont(custFont);
		addButton.setBackground(Color.BLACK);
		addButton.setForeground(Color.LIGHT_GRAY);
		addButton.addActionListener(this); // makes buttons work

		playButton.setFont(custFont);
		playButton.setBackground(Color.BLACK);
		playButton.setForeground(Color.LIGHT_GRAY);
		playButton.addActionListener(this);

		stopButton.setFont(custFont);
		stopButton.setBackground(Color.BLACK);
		stopButton.setForeground(Color.LIGHT_GRAY);
		stopButton.addActionListener(this);

		info.setFont(new Font("", Font.ITALIC, 14));
		window.add(info, BorderLayout.PAGE_END);// adds label to bottom of
												// window

		window.add(addButton, BorderLayout.LINE_START);
		window.add(playButton, BorderLayout.CENTER);
		window.add(stopButton, BorderLayout.LINE_END);

		list.setBackground(Color.BLACK);
		list.setForeground(Color.CYAN);
		window.add(list, BorderLayout.PAGE_START);

		browser.setFileFilter(filter);

		window.setSize(400, 200); // size of the window
		window.setLocation(200, 100); // where it will appear on the screen
		window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // closes window
		window.setVisible(true); // makes window visible

	}

	@Override
	public void actionPerformed(ActionEvent ae) {

		if (ae.getSource() == addButton) {
			returnValue = browser.showOpenDialog(window); // defines button

			selectFile = browser.getSelectedFile();
			music[index] = selectFile.toString();
			/*
			 * JOptionPane.showMessageDialog(null, selectFile.toString()); this
			 * opens a window showing chosen track file path
			 */
			list.addItem("Song - " + index); // adds selected track to the
												// visible list
			index++;
		}

		else if (ae.getSource() == playButton) {

			try {
				if (list.getSelectedIndex() == 0) {
					sound = new File(music[list.getSelectedIndex()]);
					ais = AudioSystem.getAudioInputStream(sound);
					clip = AudioSystem.getClip();
					clip.open(ais);
					clip.start();
				}

			} catch (Exception e) {
				JOptionPane.showMessageDialog(null, e);
			}
		}

	}
}

[Tim Moores]

Post the full stack trace of the exception - it includes the line number that points to the line of code causing the problem. You may have to print the stack trace of all exceptions, like "e.printStackTrace()" in line 113.

[Marco da Vinha]

Tim Moores wrote:Post the full stack trace of the exception - it includes the line number that points to the line of code causing the problem. You may have to print the stack trace of all exceptions, like "e.printStackTrace()" in line 113.

It gives the following result, but something seems to be wrong, as it references lines I don't even have in the code:


java.lang.IllegalArgumentException: Invalid format
at org.classpath.icedtea.pulseaudio.PulseAudioDataLine.createStream(PulseAudioDataLine.java:142)
at org.classpath.icedtea.pulseaudio.PulseAudioDataLine.open(PulseAudioDataLine.java:99)
at org.classpath.icedtea.pulseaudio.PulseAudioDataLine.open(PulseAudioDataLine.java:283)
at org.classpath.icedtea.pulseaudio.PulseAudioClip.open(PulseAudioClip.java:402)
at org.classpath.icedtea.pulseaudio.PulseAudioClip.open(PulseAudioClip.java:453)
at player.MediaPlayer.actionPerformed(MediaPlayer.java:108)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
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:6533)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
at java.awt.Component.processEvent(Component.java:6298)
at java.awt.Container.processEvent(Container.java:2236)
at java.awt.Component.dispatchEventImpl(Component.java:4889)
at java.awt.Container.dispatchEventImpl(Container.java:2294)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)
at java.awt.Container.dispatchEventImpl(Container.java:2280)
at java.awt.Window.dispatchEventImpl(Window.java:2746)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.awt.EventQueue$4.run(EventQueue.java:729)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

[Ron McLeod]

It seems like it is related to the capabilities of the platform's audio subsystem.

When I run your code and try to a play a wav file containing PCM_SIGNED 44100.0 Hz, 16 bit, stereo, 4 bytes/frame, little-endian content, it plays fine, but if I try to play a file containing ULAW 8000.0 Hz, 8 bit, mono, 1 bytes/frame content, it fails:

Try playing an audio file containng a different format and see if you have any success.

My stack trace was a bit different since I am running on Windows and it looks like you are using Linux.
javax.sound.sampled.LineUnavailableException: line with format ULAW 8000.0 Hz, 8 bit, mono, 1 bytes/frame,  not supported. at com.sun.media.sound.DirectAudioDevice$DirectDL.implOpen(DirectAudioDevice.java:513) at com.sun.media.sound.DirectAudioDevice$DirectClip.implOpen(DirectAudioDevice.java:1304) at com.sun.media.sound.AbstractDataLine.open(AbstractDataLine.java:121) at com.sun.media.sound.DirectAudioDevice$DirectClip.open(DirectAudioDevice.java:1085) at com.sun.media.sound.DirectAudioDevice$DirectClip.open(DirectAudioDevice.java:1175) at MediaPlayer.actionPerformed(MediaPlayer.java:108) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)

[Marco da Vinha]

No luck. But I've googled around and apparently this is a Linux problem with Java sound.

[Ron McLeod]

Marco da Vinha wrote:... apparently this is a Linux problem with Java sound.

Well .. I just tried on same code and the same two audio files on Fedora 18 (using pulseaudio) and Java version 1.7.0_45, and I was able to play both files, so it can work on Linux.

[Ron McLeod]

These are the packages related to pulseaudio that I have installed:

# rpm -qa | grep pulseaudio
pulseaudio-utils-2.1-7.fc18.x86_64
pulseaudio-module-x11-2.1-7.fc18.x86_64
pulseaudio-libs-glib2-2.1-7.fc18.x86_64
pulseaudio-module-bluetooth-2.1-7.fc18.x86_64
pulseaudio-gdm-hooks-2.1-7.fc18.x86_64
pulseaudio-2.1-7.fc18.x86_64
pulseaudio-libs-2.1-7.fc18.x86_64
alsa-plugins-pulseaudio-1.0.26-2.fc18.x86_64