How to send audio stream via UDP in java?
- by Nob Venoda
Hi to all :)
I have a problem, i have set MediaLocator to microphone input, and then created Player.
I need to grab that sound from the microphone, encode it to some lower quality stream, and send it as a datagram packet via UDP.
Here's the code, i found most of it online and adapted it to my app:
public class AudioSender extends Thread {
private MediaLocator ml = new MediaLocator("javasound://44100");
private DatagramSocket socket;
private boolean transmitting;
private Player player;
TargetDataLine mic;
byte[] buffer;
private AudioFormat format;
private DatagramSocket datagramSocket(){
try {
return new DatagramSocket();
} catch (SocketException ex) {
return null;
}
}
private void startMic() {
try {
format = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED, 8000.0F, 16, 2, 4, 8000.0F, true);
DataLine.Info info = new DataLine.Info(TargetDataLine.class, format);
mic = (TargetDataLine) AudioSystem.getLine(info);
mic.open(format);
mic.start();
buffer = new byte[1024];
} catch (LineUnavailableException ex) {
Logger.getLogger(AudioSender.class.getName()).log(Level.SEVERE, null, ex);
}
}
private Player createPlayer() {
try {
return Manager.createRealizedPlayer(ml);
} catch (IOException ex) {
return null;
} catch (NoPlayerException ex) {
return null;
} catch (CannotRealizeException ex) {
return null;
}
}
private void send() {
try {
mic.read(buffer, 0, 1024);
DatagramPacket packet =
new DatagramPacket(
buffer, buffer.length, InetAddress.getByName(Util.getRemoteIP()), 91);
socket.send(packet);
} catch (IOException ex) {
Logger.getLogger(AudioSender.class.getName()).log(Level.SEVERE, null, ex);
}
}
@Override
public void run() {
player = createPlayer();
player.start();
socket = datagramSocket();
transmitting = true;
startMic();
while (transmitting) {
send();
}
}
public static void main(String[] args) {
AudioSender as = new AudioSender();
as.start();
}
}
And only thing that happens when I run the receiver class, is me hearing this Player from the sender class.
And I cant seem to see the connection between TargetDataLine and Player.
Basically, I need to get the sound form player, and somehow convert it to bytes[], therefore I can sent it as datagram.
Any ideas? Everything is acceptable, as long as it works :)
