problem with capturedevice in rtp session

[mina nader]

i make an audio rtp session between 2 pcs but there is a problem with capture device
please help how can i capture it

[Rob Spoor]

Welcome to the Ranch!

With that information there isn't anything we can do. There is a problem, but you don't tell us what problem. ItDoesntWorkIsUseless and TellTheDetails.

[mina nader]

i write a code for voice transmition usin rtp protcol so i need to capture mic
but there is a problem to capture it this is the code to capture it using api(JMF-2.1.1e)
please help for the problem

AudioFormat af=new AudioFormat(AudioFormat.LINEAR,44100,16,2);
Vector devices=CaptureDeviceManager.getDeviceList(af);
CaptureDeviceInfo di = (CaptureDeviceInfo)devices.elementAt(0);
javax.media.protocol.DataSource iDS= Manager.createDataSource(di.getLocator());

[Rob Spoor]

But you still don't tell us what the problem is. Do you get a compiler error? An exception during runtime? Unexpected results? Or don't you know how to continue after that?

If it's the latter, I think you have to use one of the DataSource sub classes. If iDS is a PullDataSource, cast to PullDataSource and use the result of getStreams(). Likewise for the other known sub classes of DataSource.

[mina nader]

i get this exception
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0 >= 0
in line
CaptureDeviceInfo di=(CaptureDeviceInfo) devices.elementAt(0);

[Rob Spoor]

That means the Vector is empty. In other words, there is no capture device available for the provided AudioFormat. What does the following print:

Vector vector = CaptureDeviceManager.getDeviceList(null);
for (Object o: vector)
{
    CaptureDeviceInfo info = (CaptureDeviceInfo)o;
    System.out.println(info.getName());
    for (Format format: info.getFormats())
    {
        System.out.println("- " + format);
    }
    System.out.println();
}

Furthermore, I'm going to move this thread to Other JSE / JEE APIs since this is a JMF issue, not a socket / Internet protocols issue.

[mina nader]

the code you write doesnt print any thing
i try a code to find any captur format and i cant find any thing
thats the code

import java.io.*;
import java.awt.*;
import javax.media.*;
import javax.media.format.AudioFormat;
import javax.media.format.*;
import java.util.*;

/**
 *
 * @author mg
 */
public class Main {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args)
    {
        String audioformats[]=
        {
            AudioFormat.LINEAR,
            AudioFormat.TRUESPEECH,
            AudioFormat.MPEG,
            AudioFormat.ALAW,
            AudioFormat.ULAW,
            AudioFormat.DOLBYAC3,
            AudioFormat.DVI,
            AudioFormat.DVI,
            AudioFormat.G723,
            AudioFormat.G728,
            AudioFormat.G729,
            AudioFormat.GSM,
            AudioFormat.MAC3,
            AudioFormat.MAC6,
            AudioFormat.MPEGLAYER3,
            AudioFormat.MSADPCM,
            AudioFormat.MSNAUDIO,
            AudioFormat.MSRT24,
            AudioFormat.VOXWAREAC8,
            AudioFormat.VOXWAREAC10,
            AudioFormat.VOXWAREAC16,
            AudioFormat.VOXWAREAC20,
            AudioFormat.VOXWAREMETASOUND,
            AudioFormat.VOXWAREMETAVOICE,
            AudioFormat.VOXWARERT29H,
            AudioFormat.VOXWARETQ40,
            AudioFormat.VOXWARETQ60,
            AudioFormat.VOXWAREVR12,
            AudioFormat.VOXWAREVR18
        };

        try
        {
            for (int i=0;i<audioformats.length;i++)
            {
                AudioFormat af=new AudioFormat(audioformats[i]);
                Vector v=CaptureDeviceManager.getDeviceList(af);
                int a=v.size();
                System.out.println(a);
            }
        }
        catch (Exception e)
        {
            System.out.println(e.toString());
        }

    }

}

please help

[Rob Spoor]

Please UseCodeTags next time. Make sure to preserve your indentation as well. I've added both for you this time.

Are you sure you have a capture device installed on your system? Because CaptureDeviceManager can't find any. Perhaps you need to install them first. I can't help you with that though, since I'm not very experienced in JMF.