Accessing to hardware interfaces

Hello to everybody,
I new to java and I am trying to get some experience. So please excuse me, if I ask something stupid. :-)
I have got some self-made electronic components that I want to use by a self-written java program. The interface should be the serial interface or the USB interface. I searched for a possibility to access both of the interfaces. I found some information, but those were not complete:
On http://hestia.hs-niederrhein.de/~gkorsch/javakurs/wn8/wn8.htm (sorry, I am German) I found an example on how to access the serial interface. But how works that under the different operating systems (Win und Linux)?
USB is the bigger problem: There are a lot of diferent libraries on the internet and I do not know the differences. Anny suggestions/reports? How about the operating systems (Win & Linux)?
Thanks in advance
Christian

here is a simple Google of Java USB
http://www.google.com/search?hl=en&q=java+usb
The first couple of articles where very informative and I think could give you at least some of what you need.

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    >>>>>>>>>>>>>>>>>
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    private int localPorts[];
    private DataSource dataOutput = null;
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              rtpMgrs[i].addRemoteListener(this);
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              width = 128;
              height = 96;
         } else if (size.width < 176) {
              width = 176;
              height = 144;
         } else {
              width = 352;
              height = 288;
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              if (owner instanceof Codec) {
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              for (int j = 0; j < fmts.length; j++) {
                   if (fmts[j].matches(jpegFmt)) {
                   qc = (QualityControl)cs[i];
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                   System.err.println("- Setting quality to " +
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                   break;
              if (qc != null)
              break;
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    gbc= new GridBagConstraints();
    gbc.gridx= 1;
    gbc.gridy= 1;
    gbc.weightx= 1.0;
    gbc.weighty= 1.0;
    gbc.anchor= GridBagConstraints.CENTER;
    gbc.fill= GridBagConstraints.BOTH;
    gbc.insets= new Insets( 10, 5, 0, 0);
    ((GridBagLayout)p.getLayout()).setConstraints( targetPanel, gbc);
    p.add( targetPanel);
    JPanel mediaPanel= createMediaPanel();
    gbc= new GridBagConstraints();
    gbc.gridx= 1;
    gbc.gridy= 2;
    gbc.weightx= 1.0;
    gbc.weighty= 1.0;
    gbc.anchor= GridBagConstraints.CENTER;
    gbc.fill= GridBagConstraints.BOTH;
    gbc.insets= new Insets( 10, 5, 0, 0);
    ((GridBagLayout)p.getLayout()).setConstraints( mediaPanel, gbc);
    p.add( mediaPanel);
    JPanel buttonPanel= new JPanel();
    rtcp= new JButton( "RTCP Monitor");
    update= new JButton( "Transmission Status");
    update.setEnabled( false);
    rtcp.addActionListener( this);
    update.addActionListener( this);
    buttonPanel.add( rtcp);
    buttonPanel.add( update);
    gbc= new GridBagConstraints();
    gbc.gridx = 0;
    gbc.gridy = 3;
    gbc.gridwidth= 2;
    gbc.weightx = 1.0;
    gbc.weighty = 0.0;
    gbc.anchor = GridBagConstraints.CENTER;
    gbc.fill = GridBagConstraints.HORIZONTAL;
    gbc.insets = new Insets( 5,5,10,5);
    ((GridBagLayout)p.getLayout()).setConstraints( buttonPanel, gbc);
    p.add( buttonPanel);
    getContentPane().add( p);
    list.addMouseListener( this);
    addWindowListener( this);
    pack();
    setVisible( true);
    private JPanel createMediaPanel() {
    JPanel p= new JPanel();
    GridBagLayout gridBagLayout= new GridBagLayout();
    GridBagConstraints gbc;
    p.setLayout( gridBagLayout);
    JLabel label= new JLabel( "Media Locator:");
    gbc= new GridBagConstraints();
    gbc.gridx = 0;
    gbc.gridy = 0;
    gbc.weightx = 0.0;
    gbc.weighty = 0.0;
    gbc.anchor = GridBagConstraints.EAST;
    gbc.fill = GridBagConstraints.NONE;
    gbc.insets = new Insets( 5,5,10,5);
    ((GridBagLayout)p.getLayout()).setConstraints( label, gbc);
    p.add( label);
    tf_media_file= new JTextField( 35);
    gbc= new GridBagConstraints();
    gbc.gridx = 1;
    gbc.gridy = 0;
    gbc.weightx = 1.0;
    gbc.weighty = 0.0;
    gbc.anchor = GridBagConstraints.WEST;
    gbc.fill = GridBagConstraints.HORIZONTAL;
    gbc.insets = new Insets( 5,5,10,5);
    ((GridBagLayout)p.getLayout()).setConstraints( tf_media_file, gbc);
    p.add( tf_media_file);
    tf_media_file.setText( config.media_locator);
    cb_loop= new JCheckBox( "loop");
    startXmit= new JButton( "Start Transmission");
    startXmit.setEnabled( true);
    startXmit.addActionListener( this);
    gbc= new GridBagConstraints();
    gbc.gridx = 2;
    gbc.gridy = 0;
    gbc.weightx = 0.0;
    gbc.weighty = 0.0;
    gbc.anchor = GridBagConstraints.WEST;
    gbc.fill = GridBagConstraints.NONE;
    gbc.insets = new Insets( 5,5,10,5);
    ((GridBagLayout)p.getLayout()).setConstraints( cb_loop, gbc);
    p.add( cb_loop);
    cb_loop.setSelected( true);
    cb_loop.addActionListener( this);
    gbc= new GridBagConstraints();
    gbc.gridx = 1;
    gbc.gridy = 1;
    gbc.weightx = 0.0;
    gbc.weighty = 0.0;
    gbc.anchor = GridBagConstraints.CENTER;
    gbc.fill = GridBagConstraints.NONE;
    gbc.insets = new Insets( 5,5,10,5);
    ((GridBagLayout)p.getLayout()).setConstraints( startXmit, gbc);
    p.add( startXmit);
    TitledBorder titledBorder= new TitledBorder( new EtchedBorder(), "Source");
    p.setBorder( titledBorder);
    return p;
    private JPanel createTargetPanel() {
    JPanel p= new JPanel();
    GridBagLayout gridBagLayout= new GridBagLayout();
    GridBagConstraints gbc;
    p.setLayout( gridBagLayout);
    targets= new Vector();
    for( int i= 0; i < config.targets.size(); i++) {
    targets.addElement( config.targets.elementAt( i));
    listModel= new TargetListModel( targets);
    list= new JList( listModel);
    list.addKeyListener( this);
    list.setPrototypeCellValue( "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx");
    JScrollPane scrollPane= new JScrollPane( list,
    ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,
    ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
    gbc= new GridBagConstraints();
    gbc.gridx= 0;
    gbc.gridy= 0;
    gbc.weightx= 1.0;
    gbc.weighty= 1.0;
    gbc.anchor= GridBagConstraints.CENTER;
    gbc.fill= GridBagConstraints.BOTH;
    gbc.insets= new Insets( 10, 5, 0, 0);
    ((GridBagLayout)p.getLayout()).setConstraints( scrollPane, gbc);
    p.add( scrollPane);
    JPanel p1= new JPanel();
    p1.setLayout( gridBagLayout);
    JLabel label= new JLabel( "IP Address:");
    gbc= new GridBagConstraints();
    gbc.gridx = 0;
    gbc.gridy = 0;
    gbc.weightx = 0.0;
    gbc.weighty = 0.0;
    gbc.anchor = GridBagConstraints.EAST;
    gbc.fill = GridBagConstraints.NONE;
    gbc.insets = new Insets( 5,5,0,5);
    ((GridBagLayout)p1.getLayout()).setConstraints( label, gbc);
    p1.add( label);
    tf_remote_address= new JTextField( 15);
    gbc= new GridBagConstraints();
    gbc.gridx = 1;
    gbc.gridy = 0;
    gbc.weightx = 0.0;
    gbc.weighty = 0.0;
    gbc.anchor = GridBagConstraints.WEST;
    gbc.fill = GridBagConstraints.NONE;
    gbc.insets = new Insets( 5,5,0,5);
    ((GridBagLayout)p1.getLayout()).setConstraints( tf_remote_address, gbc);
    p1.add( tf_remote_address);
    label= new JLabel( "Data Port:");
    gbc= new GridBagConstraints();
    gbc.gridx = 0;
    gbc.gridy = 1;
    gbc.weightx = 0.0;
    gbc.weighty = 0.0;
    gbc.anchor = GridBagConstraints.EAST;
    gbc.fill = GridBagConstraints.NONE;
    gbc.insets = new Insets( 5,5,0,5);
    ((GridBagLayout)p1.getLayout()).setConstraints( label, gbc);
    p1.add( label);
    tf_remote_data_port= new JTextField( 15);
    gbc= new GridBagConstraints();
    gbc.gridx = 1;
    gbc.gridy = 1;
    gbc.weightx = 0.0;
    gbc.weighty = 0.0;
    gbc.anchor = GridBagConstraints.WEST;
    gbc.fill = GridBagConstraints.NONE;
    gbc.insets = new Insets( 5,5,0,5);
    ((GridBagLayout)p1.getLayout()).setConstraints( tf_remote_data_port, gbc);
    p1.add( tf_remote_data_port);
    JPanel p2= new JPanel();
    addTarget= new JButton( "Add Target");
    removeTarget= new JButton( "Remove Target");
    p2.add( addTarget);
    p2.add( removeTarget);
    addTarget.addActionListener( this);
    removeTarget.addActionListener( this);
    gbc= new GridBagConstraints();
    gbc.gridx = 0;
    gbc.gridy = 2;
    gbc.weightx = 1.0;
    gbc.weighty = 0.0;
    gbc.gridwidth= 2;
    gbc.anchor = GridBagConstraints.CENTER;
    gbc.fill = GridBagConstraints.HORIZONTAL;
    gbc.insets = new Insets( 20,5,0,5);
    ((GridBagLayout)p1.getLayout()).setConstraints( p2, gbc);
    p1.add( p2);
    gbc= new GridBagConstraints();
    gbc.gridx= 1;
    gbc.gridy= 0;
    gbc.weightx= 1.0;
    gbc.weighty= 1.0;
    gbc.anchor= GridBagConstraints.CENTER;
    gbc.fill= GridBagConstraints.BOTH;
    gbc.insets= new Insets( 10, 5, 0, 0);
    ((GridBagLayout)p.getLayout()).setConstraints( p1, gbc);
    p.add( p1);
    TitledBorder titledBorder= new TitledBorder( new EtchedBorder(), "Targets");
    p.setBorder( titledBorder);
    return p;
    private JPanel createLocalPanel() {
    JPanel p= new JPanel();
    GridBagLayout gridBagLayout= new GridBagLayout();
    GridBagConstraints gbc;
    p.setLayout( gridBagLayout);
    JLabel label= new JLabel( "IP Address:");
    gbc= new GridBagConstraints();
    gbc.gridx = 0;
    gbc.gridy = 0;
    gbc.weightx = 0.0;
    gbc.weighty = 0.0;
    gbc.anchor = GridBagConstraints.EAST;
    gbc.fill = GridBagConstraints.NONE;
    gbc.insets = new Insets( 5,5,0,5);
    ((GridBagLayout)p.getLayout()).setConstraints( label, gbc);
    p.add( label);
    JTextField tf_local_host= new JTextField( 15);
    gbc= new GridBagConstraints();
    gbc.gridx = 1;
    gbc.gridy = 0;
    gbc.weightx = 0.0;
    gbc.weighty = 0.0;
    gbc.anchor = GridBagConstraints.WEST;
    gbc.fill = GridBagConstraints.NONE;
    gbc.insets = new Insets( 5,5,0,5);
    ((GridBagLayout)p.getLayout()).setConstraints( tf_local_host, gbc);
    p.add( tf_local_host);
    try {
    String host= InetAddress.getLocalHost().getHostAddress();
    tf_local_host.setText( host);
    } catch( UnknownHostException e) {
    label= new JLabel( "Data Port:");
    gbc= new GridBagConstraints();
    gbc.gridx = 0;
    gbc.gridy = 1;
    gbc.weightx = 0.0;
    gbc.weighty = 0.0;
    gbc.anchor = GridBagConstraints.EAST;
    gbc.fill = GridBagConstraints.NONE;
    gbc.insets = new Insets( 5,5,0,5);
    ((GridBagLayout)p.getLayout()).setConstraints( label, gbc);
    p.add( label);
    tf_data_port= new JTextField( 15);
    gbc= new GridBagConstraints();
    gbc.gridx = 1;
    gbc.gridy = 1;
    gbc.weightx = 0.0;
    gbc.weighty = 0.0;
    gbc.anchor = GridBagConstraints.WEST;
    gbc.fill = GridBagConstraints.NONE;
    gbc.insets = new Insets( 5,5,10,5);
    ((GridBagLayout)p.getLayout()).setConstraints( tf_data_port, gbc);
    p.add( tf_data_port);
    tf_data_port.setText( config.local_data_port);
    TitledBorder titledBorder= new TitledBorder( new EtchedBorder(), "Local Host");
    p.setBorder( titledBorder);
    return p;
    public void actionPerformed( ActionEvent event) {
    Object source= event.getSource();
    if( source == addTarget) {
    String ip= tf_remote_address.getText().trim();
    String port= tf_remote_data_port.getText().trim();
    String localPort= tf_data_port.getText().trim();
    addTargetToList( localPort, ip, port);
    if( avTransmitter != null) {
    avTransmitter.addTarget( ip, port);
    } else if( source == removeTarget) {
    int index= list.getSelectedIndex();
    if( index != -1) {
    Target target= (Target) targets.elementAt( index);
    if( avTransmitter != null) {
    avTransmitter.removeTarget( target.ip, target.port);
    targets.removeElement( target);
    listModel.setData( targets);
    } else if( source == startXmit) {
    if( startXmit.getLabel().equals( "Start Transmission")) {
    int data_port= new Integer( tf_data_port.getText()).intValue();
    avTransmitter= new AVTransmitter( this, data_port);
    avTransmitter.start( tf_media_file.getText().trim(), targets);
    avTransmitter.setLooping( cb_loop.isSelected());
    startXmit.setLabel( "Stop Transmission");
    } else if( startXmit.getLabel().equals( "Stop Transmission")) {
    avTransmitter.stop();
    avTransmitter= null;
    removeNonBaseTargets();
    listModel.setData( targets);
    startXmit.setLabel( "Start Transmission");
    } else if( source == rtcp) {
    if( rtcpViewer == null) {
    rtcpViewer= new RTCPViewer();
    } else {
    rtcpViewer.setVisible( true);
    rtcpViewer.toFront();
    } else if( source == cb_loop) {
    if( avTransmitter != null) {
    avTransmitter.setLooping( cb_loop.isSelected());
    private void removeNonBaseTargets() {
    String localPort= tf_data_port.getText().trim();
    for( int i= targets.size(); i > 0;) {
    Target target= (Target) targets.elementAt( i - 1);
    if( !target.localPort.equals( localPort)) {
    targets.removeElement( target);
    i--;
    public void addTargetToList( String localPort,
    String ip, String port) {
    ListUpdater listUpdater= new ListUpdater( localPort, ip,
    port, listModel, targets);
    SwingUtilities.invokeLater( listUpdater);
    public void rtcpReport( String report) {
    if( rtcpViewer != null) {
    rtcpViewer.report( report);
    public void windowClosing( WindowEvent event) {
    config.local_data_port= tf_data_port.getText().trim();
    config.targets= new Vector();
    for( int i= 0; i < targets.size(); i++) {
    Target target= (Target) targets.elementAt( i);
    if( target.localPort.equals( config.local_data_port)) {
    config.addTarget( target.ip, target.port);
    config.media_locator= tf_media_file.getText().trim();
    config.write();
    System.exit( 0);
    public void windowClosed( WindowEvent event) {
    public void windowDeiconified( WindowEvent event) {
    public void windowIconified( WindowEvent event) {
    public void windowActivated( WindowEvent event) {
    public void windowDeactivated( WindowEvent event) {
    public void windowOpened( WindowEvent event) {
    public void keyPressed( KeyEvent event) {
    public void keyReleased( KeyEvent event) {
    Object source= event.getSource();
    if( source == list) {
    int index= list.getSelectedIndex();
    public void keyTyped( KeyEvent event) {
    public void mousePressed( MouseEvent e) {
    public void mouseReleased( MouseEvent e) {
    public void mouseEntered( MouseEvent e) {
    public void mouseExited( MouseEvent e) {
    public void mouseClicked( MouseEvent e) {
    Object source= e.getSource();
    if( source == list) {
    int index= list.getSelectedIndex();
    if( index != -1) {
    Target target= (Target) targets.elementAt( index);
    tf_remote_address.setText( target.ip);
    tf_remote_data_port.setText( target.port);
    int index= list.locationToIndex( e.getPoint());
    public static void main( String[] args) {
    new Tx();
    class TargetListModel extends AbstractListModel {
    private Vector options;
    public TargetListModel( Vector options) {
    this.options= options;
    public int getSize() {
    int size;
    if( options == null) {
    size= 0;
    } else {
    size= options.size();
    return size;
    public Object getElementAt( int index) {
    String name;
    if( index < getSize()) {
    Target o= (Target)options.elementAt( index);
    name= o.localPort + " ---> " + o.ip + ":" + o.port;
    } else {
    name= null;
    return name;
    public void setData( Vector data) {
    options= data;
    fireContentsChanged( this, 0, data.size());
    class ListUpdater implements Runnable {
    String localPort, ip, port;
    TargetListModel listModel;
    Vector targets;
    public ListUpdater( String localPort, String ip, String port,
    TargetListModel listModel, Vector targets) {
    this.localPort= localPort;
    this.ip= ip;
    this.port= port;
    this.listModel= listModel;
    this.targets= targets;
    public void run() {
    Target target= new Target( localPort, ip, port);
    if( !targetExists( localPort, ip, port)) {
    targets.addElement( target);
    listModel.setData( targets);
    public boolean targetExists( String localPort, String ip, String port) {
    boolean exists= false;
    for( int i= 0; i < targets.size(); i++) {
    Target target= (Target) targets.elementAt( i);
    if( target.localPort.equals( localPort)
    && target.ip.equals( ip)
    && target.port.equals( port)) {
    exists= true;
    break;
    return exists;
    import java.awt.*;
    import java.io.*;
    import java.net.InetAddress;
    import java.util.*;
    import javax.media.*;
    import javax.media.protocol.*;
    import javax.media.format.*;
    import javax.media.control.TrackControl;
    import javax.media.control.QualityControl;
    import javax.media.rtp.*;
    import javax.media.rtp.event.*;
    import javax.media.rtp.rtcp.*;
    public class AVTransmitter implements ReceiveStreamListener, RemoteListener,
    ControllerListener {
    // Input MediaLocator
    // Can be a file or http or capture source
    private MediaLocator locator;
    private String ipAddress;
    private int portBase;
    private Processor processor = null;
    private RTPManager rtpMgrs[];
    private int localPorts[];
    private DataSource dataOutput = null;
    private int local_data_port;
    private Tx tx;
    public AVTransmitter( Tx tx, int data_port) {
    this.tx= tx;
    local_data_port= data_port;
    * Starts the transmission. Returns null if transmission started ok.
    * Otherwise it returns a string with the reason why the setup failed.
    public synchronized String start( String filename, Vector targets) {
    String result;
    locator= new MediaLocator( filename);
    // Create a processor for the specified media locator
    // and program it to output JPEG/RTP
    result = createProcessor();
    if (result != null) {
    return result;
    // Create an RTP session to transmit the output of the
    // processor to the specified IP address and port no.
    result = createTransmitter( targets);
    if (result != null) {
    processor.close();
    processor = null;
    return result;
    // Start the transmission
    processor.start();
    return null;
    * Use the RTPManager API to create sessions for each media
    * track of the processor.
    private String createTransmitter( Vector targets) {
    // Cheated. Should have checked the type.
    PushBufferDataSource pbds = (PushBufferDataSource)dataOutput;
    PushBufferStream pbss[] = pbds.getStreams();
    rtpMgrs = new RTPManager[pbss.length];
    localPorts = new int[ pbss.length];
    SessionAddress localAddr, destAddr;
    InetAddress ipAddr;
    SendStream sendStream;
    int port;
    SourceDescription srcDesList[];
    for (int i = 0; i < pbss.length; i++) {
    // for (int i = 0; i < 1; i++) {
    try {
    rtpMgrs[i] = RTPManager.newInstance();
    port = local_data_port + 2*i;
    localPorts[ i]= port;
    localAddr = new SessionAddress( InetAddress.getLocalHost(),
    port);
    rtpMgrs.initialize( localAddr);
    rtpMgrs[i].addReceiveStreamListener(this);
    rtpMgrs[i].addRemoteListener(this);
    for( int k= 0; k < targets.size(); k++) {
    Target target= (Target) targets.elementAt( k);
    int targetPort= new Integer( target.port).intValue();
    addTarget( localPorts[ i], rtpMgrs[ i], target.ip, targetPort + 2*i);
    sendStream = rtpMgrs[i].createSendStream(dataOutput, i);
    sendStream.start();
    } catch (Exception e) {
    e.printStackTrace();
    return e.getMessage();
    return null;
    public void addTarget( String ip, String port) {
    for (int i= 0; i < rtpMgrs.length; i++) {
    int targetPort= new Integer( port).intValue();
    addTarget( localPorts[ i], rtpMgrs[ i], ip, targetPort + 2*i);
    public void addTarget( int localPort, RTPManager mgr, String ip, int port) {
    try {
    SessionAddress addr= new SessionAddress( InetAddress.getByName( ip),
    new Integer( port).intValue());
    mgr.addTarget( addr);
    tx.addTargetToList( localPort + "", ip, port + "");
    } catch( Exception e) {
    e.printStackTrace();
    public void removeTarget( String ip, String port) {
    try {
    SessionAddress addr= new SessionAddress( InetAddress.getByName( ip),
    new Integer( port).intValue());
    for (int i= 0; i < rtpMgrs.length; i++) {
    rtpMgrs[ i].removeTarget( addr, "target removed from transmitter.");
    } catch( Exception e) {
    e.printStackTrace();
    boolean looping= true;
    public void controllerUpdate( ControllerEvent ce) {
    System.out.println( ce);
    if( ce instanceof DurationUpdateEvent) {
    Time duration= ((DurationUpdateEvent) ce).getDuration();
    System.out.println( "duration: " + duration.getSeconds());
    } else if( ce instanceof EndOfMediaEvent) {
    System.out.println( "END OF MEDIA - looping=" + looping);
    if( looping) {
    processor.setMediaTime( new Time( 0));
    processor.start();
    public void setLooping( boolean flag) {
    looping= flag;
    public void update( ReceiveStreamEvent event) {
    String timestamp= getTimestamp();
    StringBuffer sb= new StringBuffer();
    if( event instanceof InactiveReceiveStreamEvent) {
    sb.append( timestamp + " Inactive Receive Stream");
    } else if( event instanceof ByeEvent) {
    sb.append( timestamp + " Bye");
    } else {
    System.out.println( "ReceiveStreamEvent: "+ event);
    tx.rtcpReport( sb.toString());
    public void update( RemoteEvent event) {
    String timestamp= getTimestamp();
    if( event instanceof ReceiverReportEvent) {
    ReceiverReport rr= ((ReceiverReportEvent) event).getReport();
    StringBuffer sb= new StringBuffer();
    sb.append( timestamp + " RR");
    if( rr != null) {
    Participant participant= rr.getParticipant();
    if( participant != null) {
    sb.append( " from " + participant.getCNAME());
    sb.append( " ssrc=" + rr.getSSRC());
    } else {
    sb.append( " ssrc=" + rr.getSSRC());
    tx.rtcpReport( sb.toString());
    } else {
    System.out.println( "RemoteEvent: " + event);
    private String getTimestamp() {
    String timestamp;
    Calendar calendar= Calendar.getInstance();
    int hour= calendar.get( Calendar.HOUR_OF_DAY);
    String hourStr= formatTime( hour);
    int minute= calendar.get( Calendar.MINUTE);
    String minuteStr= formatTime( minute);
    int second= calendar.get( Calendar.SECOND);
    String secondStr= formatTime( second);
    timestamp= hourStr + ":" + minuteStr + ":" + secondStr;
    return timestamp;
    private String formatTime( int time) {
    String timeStr;
    if( time < 10) {
    timeStr= "0" + time;
    } else {
    timeStr= "" + time;
    return timeStr;
    * Stops the transmission if already started
    public void stop() {
    synchronized (this) {
    if (processor != null) {
    processor.stop();
    processor.close();
    processor = null;
    for (int i= 0; i < rtpMgrs.length; i++) {
    rtpMgrs[ i].removeTargets( "Session ended.");
    rtpMgrs[ i].dispose();
    public String createProcessor() {
    if (locator == null) {
    return "Locator is null";
    DataSource ds;
    DataSource clone;
    try {
    ds = javax.media.Manager.createDataSource(locator);
    } catch (Exception e) {
    return "Couldn't create DataSource";
    // Try to create a processor to handle the input media locator
    try {
    processor = javax.media.Manager.createProcessor(ds);
    processor.addControllerListener( this);
    } catch (NoProcessorException npe) {
    return "Couldn't create processor";
    } catch (IOException ioe) {
    return "IOException creating processor";
    // Wait for it to configure
    boolean result = waitForState(processor, Processor.Configured);
    if (result == false)
    return "Couldn't configure processor";
    // Get the tracks from the processor
    TrackControl [] tracks = processor.getTrackControls();
    // Do we have atleast one track?
    if (tracks == null || tracks.length < 1)
    return "Couldn't find tracks in processor";
    // Set the output content descriptor to RAW_RTP
    // This will limit the supported formats reported from
    // Track.getSupportedFormats to only valid RTP formats.
    ContentDescriptor cd = new ContentDescriptor(ContentDescriptor.RAW_RTP);
    processor.setContentDescriptor(cd);
    Format supported[];
    Format chosen;
    boolean atLeastOneTrack = false;
    // Program the tracks.
    for (int i = 0; i < tracks.length; i++) {
    Format format = tracks[i].getFormat();
    if (tracks[i].isEnabled()) {
    supported = tracks[i].getSupportedFormats();
    // We've set the output content to the RAW_RTP.
    // So all the supported formats should work with RTP.
    // We'll just pick the first one.
    if (supported.length > 0) {
    if (supported[0] instanceof VideoFormat) {
    // For video formats, we should double check the
    // sizes since not all formats work in all sizes.
    chosen = checkForVideoSizes(tracks[i].getFormat(),
    supported[0]);
    } else
    chosen = supported[0];
    tracks[i].setFormat(chosen);
    System.err.println("Track " + i + " is set to transmit as:");
    System.err.println(" " + chosen);
    atLeastOneTrack = true;
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