/**
* Re-detects all camera devices connected to the system. Returns without performing any action if
* a media stream is currently being served.
*/
public synchronized void updateDeviceList() {
if (currentStream != null) {
log.error("Attempted to update capture list while serving a stream.");
return;
}
// Store the old list of cameras, and generate a new list to store
// cameras detected during this update
List<CameraController> oldCameras = cameras;
CameraController oldActiveCam = getActiveCamera();
cameras = new ArrayList<CameraController>();
// Detect all connected cameras, and generate a new CameraController
// for those which were not present during the last update of the device
// list
NativeCaptureSystemFactory captureFactory = new NativeCaptureSystemFactory();
try {
CaptureSystem captureSystem = captureFactory.createCaptureSystem();
captureSystem.init();
List<com.lti.civil.CaptureDeviceInfo> devices = captureSystem.getCaptureDeviceInfoList();
for (com.lti.civil.CaptureDeviceInfo device : devices) {
log.info(
"LTI-Civil found device: " + device.getDescription() + " - " + device.getDeviceID());
// Add the previously existing camera controller for the detected
// device, or create a new one of no controller is available
boolean foundExisting = false;
for (CameraController c : oldCameras) {
if (c.getDeviceId().equals(device.getDeviceID())) {
cameras.add(c);
foundExisting = true;
break;
}
}
if (!foundExisting) {
CameraController newCam = new CameraController(device);
cameras.add(newCam);
}
}
if (cameras.isEmpty()) {
selectedCamera = null;
} else {
if (cameras.contains(oldActiveCam)) {
setActiveCamera(oldActiveCam);
} else {
// Note: Defaults to first detected camera if no active
// camera was previously selected
setActiveCamera(cameras.get(0));
}
}
} catch (CaptureException e) {
e.printStackTrace();
}
}
@Override
public List<WebcamDevice> getDevices() {
initialize();
int i = 0;
while (!ready) {
try {
Thread.sleep(100);
} catch (InterruptedException e) {
return null;
}
// wait max 10 seconds for driver to be ready
if (i++ > 100) {
throw new RuntimeException(
"Cannot get devices because capture driver has not become ready for 10 seconds");
}
}
List<WebcamDevice> devices = new ArrayList<WebcamDevice>();
try {
for (Object cdi : system.getCaptureDeviceInfoList()) {
devices.add(new LtiCivilDevice((CaptureDeviceInfo) cdi));
}
} catch (CaptureException e) {
throw new WebcamException(e);
}
return devices;
}
private static void initialize() {
if (!INIT.compareAndSet(false, true)) {
return;
}
LtiCivilLoader.load("civil");
factory = DefaultCaptureSystemFactorySingleton.instance();
try {
system = factory.createCaptureSystem();
system.init();
ready = true;
} catch (UnsatisfiedLinkError e) {
// ignore - it is already loaded
LOG.debug("Library already loaded");
} catch (CaptureException e) {
throw new WebcamException(e);
}
}