Make a voice transmitter over the network?

Question

Hi i have read that it is possible in javax.sound to send or transmit live audio over the network or simply make a VoIP phone using the javax.sound api. I would like to ask if how can I be able to send the sound of the network. I have this step by step instruction about capturing and sending the voice in the network:
• Use TargetDataLine for streaming capture
• The TargetDataLine is wrapped in an AudioInputStream so that it can be converted to the network format with AudioSystem
• a capture thread reads from the converted AudioInputStream and writes it to the network connection's OutputStream.
Here is my code:
     audioFormat = getAudioFormat();
        DataLine.Info dataLineInfo = new DataLine.Info(TargetDataLine.class, audioFormat);
     targetDataLine = (TargetDataLine)AudioSystem.getLine(dataLineInfo);
     audioInputStream = new AudioInputStream(targetDataLine);I am not sure about this code but I am sure that there must be a targetDataLine associated in sending the voice. Please help me with this. Thank you.

Answer 1

TargetDataLines are for reading from, SourceDataLines are for writing to, and AudioInputStreams are for loading/saving from a file.
That said, there will be a TargetDataLine you can read from that's associated with your microphone. You create an AudioInputStream to read from the TargetDataLine (which is just an argument in the constructor), and then you can do...
AudioSystem.write
Give it the AIS associated with hte TDL, and you can either have it write it to a file or to an output stream. If that output stream was, say...an IP socket stream...then you could send it over the network to the other side...where you'd then need to construct an AudioInputStream to read it from the IP socket stream, and then to play it, you'd read some data from the AIS and write it to a SourceDataLine.
Here are some resources to help you with the JavaSound stuff.
JavaSound Example code (take a look at SimpleAudioPlayer & SimpleAudioRecorder in the Audio Playback and Recording section)
[http://www.jsresources.org/examples/]
Programmer's guide
[http://java.sun.com/j2se/1.5.0/docs/guide/sound/programmer_guide/contents.html]
And then just the normal Java SE6 API
[http://java.sun.com/javase/6/docs/api/]