Error in feeding JMF with inputstream, please help

Question

Hi,
in order to feed JMF with inputstreams, audioinputstreams actually, you have to modify the DataSource.java and write a custom one so that it accepts inputstreams for the construction of the datasource, because with MediaLocator you can only specify existing files in the hard disk or somewhere in the network.
Searching I found this ByteBufferDataSource, which allows you to construct a DataSource from a ByteBuffer object.
The problem is that when using it and trying to send the stream via RTP to another machine, i get the following error:
Exception in thread "JMF thread: com.sun.media.ProcessEngine@d6a05e[ com.sun.media.ProcessEngine@d6a05e ] ( configureThread)" java.lang.NullPointerException
     at com.sun.media.ProcessEngine.isRTPFormat(ProcessEngine.java:99)
     at com.sun.media.ProcessEngine.reenableHintTracks(ProcessEngine.java:107)
     at com.sun.media.ProcessEngine.doConfigure(ProcessEngine.java:63)
     at com.sun.media.ConfigureWorkThread.process(BasicController.java:1370)
     at com.sun.media.StateTransitionWorkThread.run(BasicController.java:1339)
This error has appeared in some other post, but haven�t found the solution to it, I guess is something to do with the file format.
So please, I really need your help with this, as I�m getting stuck in a academical project because of this. I attach the bytebufferdatasource
Thank you for your time,
bye
import javax.media.protocol.ContentDescriptor;
import javax.media.protocol.PullDataSource;
import java.nio.ByteBuffer;
import java.io.IOException;
import javax.media.MediaLocator;
import javax.media.Duration;
import javax.media.Time;
* @author Chad McMillan
public class ByteBufferDataSource extends PullDataSource {
protected ContentDescriptor contentType;
protected SeekableStream[] sources;
protected boolean connected;
protected ByteBuffer anInput;
protected ByteBufferDataSource(){
* Construct a <CODE>ByteBufferDataSource</CODE> from a <CODE>ByteBuffer</CODE>.
* @param source The <CODE>ByteBuffer</CODE> that is used to create the
* the <CODE>DataSource</CODE>.
public ByteBufferDataSource(ByteBuffer input, String contentType) throws IOException {
anInput = input;
this.contentType = new ContentDescriptor(contentType);
connected = false;
* Open a connection to the source described by
* the <CODE>ByteBuffer/CODE>.
* <p>
* The <CODE>connect</CODE> method initiates communication with the source.
* @exception IOException Thrown if there are IO problems
* when <CODE>connect</CODE> is called.
public void connect() throws java.io.IOException {
connected = true;
sources = new SeekableStream [1];
sources[0] = new SeekableStream(anInput);
* Close the connection to the source described by the locator.
* <p>
* The <CODE>disconnect</CODE> method frees resources used to maintain a
* connection to the source.
* If no resources are in use, <CODE>disconnect</CODE> is ignored.
* If <CODE>stop</CODE> hasn't already been called,
* calling <CODE>disconnect</CODE> implies a stop.
public void disconnect() {
if(connected) {
sources[0].close();
connected = false;
* Get a string that describes the content-type of the media
* that the source is providing.
* <p>
* It is an error to call <CODE>getContentType</CODE> if the source is
* not connected.
* @return The name that describes the media content.
public String getContentType() {
if( !connected) {
throw new java.lang.Error("Source is unconnected.");
return contentType.getContentType();
public Object getControl(String str) {
return null;
public Object[] getControls() {
return new Object[0];
public javax.media.Time getDuration() {
return Duration.DURATION_UNKNOWN;
* Get the collection of streams that this source
* manages. The collection of streams is entirely
* content dependent. The MIME type of this
* <CODE>DataSource</CODE> provides the only indication of
* what streams can be available on this connection.
* @return The collection of streams for this source.
public javax.media.protocol.PullSourceStream[] getStreams() {
if( !connected) {
throw new java.lang.Error("Source is unconnected.");
return sources;
* Initiate data-transfer. The <CODE>start</CODE> method must be
* called before data is available.
*(You must call <CODE>connect</CODE> before calling <CODE>start</CODE>.)
* @exception IOException Thrown if there are IO problems with the source
* when <CODE>start</CODE> is called.
public void start() throws IOException {
* Stop the data-transfer.
* If the source has not been connected and started,
* <CODE>stop</CODE> does nothing.
public void stop() throws IOException {
}

Answer 1

Sorry for the formatting, I attach it again here with well format:
the error was:
Exception in thread "JMF thread: com.sun.media.ProcessEngine@d6a05e[ com.sun.media.ProcessEngine@d6a05e ] ( configureThread)" java.lang.NullPointerException
     at com.sun.media.ProcessEngine.isRTPFormat(ProcessEngine.java:99)
     at com.sun.media.ProcessEngine.reenableHintTracks(ProcessEngine.java:107)
     at com.sun.media.ProcessEngine.doConfigure(ProcessEngine.java:63)
     at com.sun.media.ConfigureWorkThread.process(BasicController.java:1370)
     at com.sun.media.StateTransitionWorkThread.run(BasicController.java:1339)
and the java file for generating the datasource from the bytebuffer was:
import javax.media.protocol.ContentDescriptor;
import javax.media.protocol.PullDataSource;
import java.nio.ByteBuffer;
import java.io.IOException;
import javax.media.MediaLocator;
import javax.media.Duration;
import javax.media.Time;
* @author  Chad McMillan
public class ByteBufferDataSource extends PullDataSource {
    protected ContentDescriptor contentType;
    protected SeekableStream[] sources;
    protected boolean connected;
    protected ByteBuffer anInput;
    protected ByteBufferDataSource(){
     * Construct a <CODE>ByteBufferDataSource</CODE> from a <CODE>ByteBuffer</CODE>.
     * @param source The <CODE>ByteBuffer</CODE> that is used to create the
     * the <CODE>DataSource</CODE>.
    public ByteBufferDataSource(ByteBuffer input, String contentType) throws IOException {
        anInput = input;
        this.contentType = new ContentDescriptor(contentType);
        connected = false;
     * Open a connection to the source described by
     * the <CODE>ByteBuffer/CODE>.
     * <p>
     * The <CODE>connect</CODE> method initiates communication with the source.
     * @exception IOException Thrown if there are IO problems
     * when <CODE>connect</CODE> is called.
    public void connect() throws java.io.IOException {
        connected = true;
        sources = new SeekableStream [1];
        sources[0] = new SeekableStream(anInput);
     * Close the connection to the source described by the locator.
     * <p>
     * The <CODE>disconnect</CODE> method frees resources used to maintain a
     * connection to the source.
     * If no resources are in use, <CODE>disconnect</CODE> is ignored.
     * If <CODE>stop</CODE> hasn't already been called,
     * calling <CODE>disconnect</CODE> implies a stop.
    public void disconnect() {
        if(connected) {
            sources[0].close();
        connected = false;
     * Get a string that describes the content-type of the media
     * that the source is providing.
     * <p>
     * It is an error to call <CODE>getContentType</CODE> if the source is
     * not connected.
     * @return The name that describes the media content.
    public String getContentType() {
        if( !connected) {
       throw new java.lang.Error("Source is unconnected.");
        return contentType.getContentType();
    public Object getControl(String str) {
        return null;
    public Object[] getControls() {
        return new Object[0];
    public javax.media.Time getDuration() {
        return Duration.DURATION_UNKNOWN;
     * Get the collection of streams that this source
     * manages. The collection of streams is entirely
     * content dependent. The  MIME type of this
     * <CODE>DataSource</CODE> provides the only indication of
     * what streams can be available on this connection.
     * @return The collection of streams for this source.
    public javax.media.protocol.PullSourceStream[] getStreams() {
        if( !connected) {
       throw new java.lang.Error("Source is unconnected.");
        return sources;
     * Initiate data-transfer. The <CODE>start</CODE> method must be
     * called before data is available.
     *(You must call <CODE>connect</CODE> before calling <CODE>start</CODE>.)
     * @exception IOException Thrown if there are IO problems with the source
     * when <CODE>start</CODE> is called.
    public void start() throws IOException {
     * Stop the data-transfer.
     * If the source has not been connected and started,
     * <CODE>stop</CODE> does nothing.
    public void stop() throws IOException {
}