How to synchronize both audio & video received through AVTransmit2.java ?

hi,
I will transmit an local video file using AVTransmit2.java, but the problem is i am not able to synchronize both
audio & video streams transmitted. I have an applet which receives both the streams(audio & video) but it
plays in different players. how to synchronize both the players ?
thanks

I know that In Midlet development using MMAPI there are APIs available to synronize the players like
p1.setTimaBase(p2.getTimeBase())
But I am not using Players. Through http connection I m getting the raw image data and displaying it through ImageItem i.e no players required.
Therefore If i stream the audio like this How to synchronize that.
I relly need ur Help
Thanks

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Codes for audio video receiver class

I am currently writting an audio and video receiver for my project based on AVReceive3, it works but i can only get Video only, everything seems to be normal, i dont see why i am not getting audio. My transmitter is working fine and sending both streams.
If anyone can spot the error or mistake i a making, pleaase let me know as soon as possible.
my email address is [email protected]
public class AudVidReceive extends Frame implements ActionListener,ReceiveStreamListener,SessionListener,ControllerListener
// Input MediaLocator
// Can be a file or http or capture source
private MediaLocator alocator;
MediaLocator vlocator,vloct,aloct;
private String ipAddress;
private int portBase;
Button transtop,transtart,recstop,recstart;
Component controlPanel, visualComponent;
//For Receiving Media Stream
String sessions[] = null;
SessionManager mgrs[] = null;
Vector playerWindows = null;
boolean dataReceived = false;
Object dataSync = new Object();
private Processor processor = null;
Player player=null;
Format fmt=null;
private SessionManager rtpMgrs[];
private DataSource dataOutput = null;
DataSource ads=null;
DataSource vds=null;
DataSource source[];
DataSource m=null;
public AudVidReceive()
super("Audio Video Receive");
recstart=new Button("StartReceiving");
//recstop=new Button("Stop Receiving");
add(recstart);
recstart.setBounds(80,250,100,30);
recstart.addActionListener(this);
setLayout(null);
setSize(400,300);
setVisible(true);
//this.sessions=sessions;
public void actionPerformed(ActionEvent e)
Button b=(Button)e.getSource();
String ac=e.getActionCommand();
if(ac.equalsIgnoreCase("StartReceiving"))
boolean flag;
boolean st=initialize();
if(!st)
System.err.println("Failed to Realize the Sessions ");
System.exit(-1);
flag=isDone();
try{
while(!flag)
Thread.sleep(1000);
}catch(Exception e1)
e1.printStackTrace();
//Initialize the Session for Receiving the Incomming Stream
protected boolean initialize() {
try {
InetAddress ipAddr;
SessionAddress localAddr = new SessionAddress();
SessionAddress destAddr;
String sessions[]={"192.168.2.143/42060"};
mgrs = new com.sun.media.rtp.RTPSessionMgr[sessions.length];
playerWindows = new Vector();
SessionLabel session;
// Open the RTP sessions.
for (int i = 0; i < sessions.length; i++) {
// Parse the session addresses.
try {
session = new SessionLabel(sessions);
} catch (IllegalArgumentException e) {
System.err.println("Failed to parse the session address given: " + sessions[i]);
return false;
System.err.println(" - Open RTP session for: addr: " + session.addr + " port: " + session.port + " ttl: " + session.ttl);
mgrs[i] = new com.sun.media.rtp.RTPSessionMgr();
mgrs[i].addSessionListener(this);
mgrs[i].addReceiveStreamListener(this);
ipAddr = InetAddress.getByName(session.addr);
destAddr = new SessionAddress(ipAddr, session.port,
ipAddr, session.port+1);
mgrs[i].initSession(localAddr, getSDES(mgrs[i]), .05, .25);
// You can try out some other buffer size to see
// if you can get better smoothness.
BufferControl bc = (BufferControl)mgrs[i].getControl("javax.media.control.BufferControl");
if (bc != null)
bc.setBufferLength(350);
mgrs[i].startSession(destAddr, session.ttl, null);
} catch (Exception e){
System.err.println("Cannot create the RTP Session: " + e.getMessage());
return false;
// Wait for data to arrive before moving on.
long then = System.currentTimeMillis();
long waitingPeriod = 120000; // wait for a maximum of 30 secs.
try{
synchronized (dataSync)
while (!dataReceived && System.currentTimeMillis() - then < waitingPeriod) {
if (!dataReceived)
System.err.println(" - Waiting for RTP data to arrive...");
dataSync.wait(1000);
}catch (Exception e) {}
if (!dataReceived) {
System.err.println("No RTP data was received.");
close();
return false;
return true;
* Find out the host info.
String cname = null;
private SourceDescription[] getSDES(SessionManager mgr)
SourceDescription[] desclist = new SourceDescription[3];
if (cname == null)
cname = mgr.generateCNAME();
desclist[0] = new
SourceDescription(SourceDescription.SOURCE_DESC_NAME,
System.getProperty("user.name"),
1,
false);
desclist[1] = new
SourceDescription(SourceDescription.SOURCE_DESC_CNAME,
cname,
1,
false);
desclist[2] = new
SourceDescription(SourceDescription.SOURCE_DESC_TOOL,
"AVReceive powered by JMF",
1,
false);
return desclist;
//Check Player window sizing
public boolean isDone() {
return playerWindows.size() == 0;
* Close the players and the session managers.
protected void close()
for (int i = 0; i < playerWindows.size(); i++)
try {
((PlayerWindow)playerWindows.elementAt(i)).close();
} catch (Exception e) {}
playerWindows.removeAllElements();
// close the RTP session.
for (int i = 0; i < mgrs.length; i++) {
if (mgrs[i] != null) {
mgrs[i].closeSession("Closing session from AudVidReceive");
mgrs[i] = null;
//Find the player
PlayerWindow find(Player p) {
for (int i = 0; i < playerWindows.size(); i++) {
PlayerWindow pw = (PlayerWindow)playerWindows.elementAt(i);
if (pw.player == p)
return pw;
return null;
//Find whether the Player is receiving the Stream
PlayerWindow find(ReceiveStream strm) {
for (int i = 0; i < playerWindows.size(); i++) {
PlayerWindow pw = (PlayerWindow)playerWindows.elementAt(i);
if (pw.stream == strm)
return pw;
return null;
* SessionListener.
public synchronized void update(SessionEvent evt) {
if (evt instanceof NewParticipantEvent) {
Participant p = ((NewParticipantEvent)evt).getParticipant();
System.err.println(" - A new participant had just joined: " + p.getCNAME());
* ReceiveStreamListener
public synchronized void update( ReceiveStreamEvent evt) {
SessionManager mgr = (SessionManager)evt.getSource();
Participant participant = evt.getParticipant(); // could be null.
ReceiveStream stream = evt.getReceiveStream(); // could be null.
if (evt instanceof RemotePayloadChangeEvent) {
System.err.println(" - Received an RTP PayloadChangeEvent.");
System.err.println("Sorry, cannot handle payload change.");
System.exit(0);
else if (evt instanceof NewReceiveStreamEvent) {
try {
stream = ((NewReceiveStreamEvent)evt).getReceiveStream();
DataSource ds = stream.getDataSource();
// Find out the formats.
RTPControl ctl = (RTPControl)ds.getControl("javax.media.rtp.RTPControl");
if (ctl != null){
System.err.println(" - Recevied new RTP stream: " + ctl.getFormat());
} else
System.err.println(" - Recevied new RTP stream");
if (participant == null)
System.err.println(" The sender of this stream had yet to be identified.");
else {
System.err.println(" The stream comes from: " + participant.getCNAME());
// create a player by passing datasource to the Media Manager
Player p = javax.media.Manager.createPlayer(ds);
if (p == null)
return;
p.addControllerListener(this);
p.realize();
PlayerWindow pw = new PlayerWindow(p, stream);
playerWindows.addElement(pw);
// Notify intialize() that a new stream had arrived.
synchronized (dataSync) {
dataReceived = true;
dataSync.notifyAll();
} catch (Exception e) {
System.err.println("NewReceiveStreamEvent exception " + e.getMessage());
return;
}//above catch closing if
else if (evt instanceof StreamMappedEvent) {
if (stream != null && stream.getDataSource() != null) {
DataSource ds = stream.getDataSource();
// Find out the formats.
RTPControl ctl = (RTPControl)ds.getControl("javax.media.rtp.RTPControl");
System.err.println(" - The previously unidentified stream ");
if (ctl != null)
System.err.println(" " + ctl.getFormat());
System.err.println(" had now been identified as sent by: " + participant.getCNAME());
else if (evt instanceof ByeEvent) {
System.err.println(" - Got \"bye\" from: " + participant.getCNAME());
PlayerWindow pw = find(stream);
if (pw != null) {
pw.close();
playerWindows.removeElement(pw);
}// end of this method
* ControllerListener for the Players.
public synchronized void controllerUpdate(ControllerEvent ce) {
Player p = (Player)ce.getSourceController();
if (p == null)
return;
// Get this when the internal players are realized.
if (ce instanceof RealizeCompleteEvent) {
PlayerWindow pw = find(p);
if (pw == null) {
// Some strange happened.
System.err.println("Internal error!");
System.exit(-1);
pw.initialize();
pw.setVisible(true);
p.start();
if (ce instanceof ControllerErrorEvent) {
p.removeControllerListener(this);
PlayerWindow pw = find(p);
if (pw != null) {
pw.close();
playerWindows.removeElement(pw);
System.err.println("AVReceive internal error: " + ce);
* A utility class to parse the session addresses.
class SessionLabel {
public String addr = null;
public int port;
public int ttl = 1;
SessionLabel(String session) throws IllegalArgumentException {
int off;
String portStr = null, ttlStr = null;
if (session != null && session.length() > 0) {
while (session.length() > 1 && session.charAt(0) == '/')
session = session.substring(1);
// Now see if there's a addr specified.
off = session.indexOf('/');
if (off == -1) {
if (!session.equals(""))
addr = session;
} else {
addr = session.substring(0, off);
session = session.substring(off + 1);
// Now see if there's a port specified
off = session.indexOf('/');
if (off == -1) {
if (!session.equals(""))
portStr = session;
} else {
portStr = session.substring(0, off);
session = session.substring(off + 1);
// Now see if there's a ttl specified
off = session.indexOf('/');
if (off == -1) {
if (!session.equals(""))
ttlStr = session;
} else {
ttlStr = session.substring(0, off);
if (addr == null)
throw new IllegalArgumentException();
if (portStr != null) {
try {
Integer integer = Integer.valueOf(portStr);
if (integer != null)
port = integer.intValue();
} catch (Throwable t) {
throw new IllegalArgumentException();
} else
throw new IllegalArgumentException();
if (ttlStr != null) {
try {
Integer integer = Integer.valueOf(ttlStr);
if (integer != null)
ttl = integer.intValue();
} catch (Throwable t) {
throw new IllegalArgumentException();
* GUI classes for the Player.
class PlayerWindow extends Frame {
Player player;
ReceiveStream stream;
PlayerWindow(Player p, ReceiveStream strm) {
player = p;
stream = strm;
public void initialize() {
add(new PlayerPanel(player));
public void close() {
player.close();
setVisible(false);
dispose();
public void addNotify() {
super.addNotify();
pack();
* GUI classes for the Player.
class PlayerPanel extends Panel {
Component vc, cc;
PlayerPanel(Player p) {
setLayout(new BorderLayout());
if ((vc = p.getVisualComponent()) != null)
add("Center", vc);
if ((cc = p.getControlPanelComponent()) != null)
add("South", cc);
public Dimension getPreferredSize() {
int w = 0, h = 0;
if (vc != null) {
Dimension size = vc.getPreferredSize();
w = size.width;
h = size.height;
if (cc != null) {
Dimension size = cc.getPreferredSize();
if (w == 0)
w = size.width;
h += size.height;
if (w < 160)
w = 160;
return new Dimension(w, h);
public static void main(String [] args) {
Format fmt = null;
int i = 0;
AudVidReceive at1 = new AudVidReceive();
System.err.println("Start Receiving incoming Streams ");
try {
Thread.currentThread().sleep(60000);
} catch (InterruptedException ie) {
ie.printStackTrace();

I have to use RTP and RTSP for transferring the
audio/video streams in real time.
How I can sen and receive RTP packets.
How can I make the RTP Player.
What is the role of JMF in it.
Please suggest me and provide me the codes if
possible.
Thanks alot
shobhit vermaThere are two ways using which you can send and recieve packets using rtp. One without using the SessionManager and the other with.
1.) Not using the SessionManager makes things easy for you but it offers very little flexibility to you. You can do this by just specifying a medialocator pointing to the specific url
2.) Using the SessionManager is what is usually suggested. This process is more complex. First you have to instantiate a RTPSessionMgr to a SessionManager reference using which you can send and receive streams to and from the network. The process is more involved than this and is suggest you read some tutorials to get a better understanding, than me explaining to you the entire process.
Message was edited by:
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How to synchronize both audio & video received through AVTransmit2.java ?

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