Capture device in use

Question

Hi,
I am using jmf to capture device video, How I can test if the video device is in use or no?
thinks

Answer 1

I use the following function to create a clone data source.But I have an exception:IOException:capture device in use
Can u help me?
public DataSource initDevice()
Vector formatsCatalog = new Vector();
Vector audioDevices = new Vector();
Vector videoDevices = new Vector();
Vector devices = new Vector();
// rcupration des priphriques disponibles
devices = CaptureDeviceManager.getDeviceList (null);
CaptureDeviceInfo cdi;
if (devices != null && devices.size() > 0)
int devicesNum = devices.size();
Format[] formats;
for ( int i = 0; i < devicesNum; i++)
cdi = (CaptureDeviceInfo) devices.elementAt (i);
formats = cdi.getFormats();
formatsCatalog.addElement(formats);
// on spare les periphriques audio et vido
for (int j = 0; j < formats.length; j++)
if (formats[j] instanceof AudioFormat)
audioDevices.addElement(cdi);
break;
else if (formats[j] instanceof VideoFormat)
videoDevices.addElement(cdi);
break;
CaptureDeviceInfo cdiVideo;
// on recupre l'unique device video
cdiVideo = (CaptureDeviceInfo) (videoDevices).elementAt(0);
// on recupere les formats disponibles
Format[] video = cdiVideo.getFormats();
// on slctionne un format
format = video[3];
System.out.println("Type: " + video[3].getEncoding() + " Data: " + video[3].getDataType());
try {
// on cr le DataSource
ds = Manager.createDataSource(cdiVideo.getLocator());
this.dsclone =(DataSource) Manager.createCloneableDataSource(ds);
// ds= (DataSource) ((SourceCloneable)ds).createClone();
return dsclone;
catch (IOException ioe) {
System.out.println("Capture device "+ioe);
System.out.println("Capture device "+ioe.getMessage());
catch (NoDataSourceException ndse) {
System.out.println(ndse);
return null;
}