/**
* 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();
}
}
/** Stops the currently active media stream (does nothing if no stream is active) */
public synchronized void stopStream() {
if (currentStream != null) {
try {
currentStream.stop();
} catch (CaptureException e) {
log.error("Attempt to stop capture stream failed.");
e.printStackTrace();
} finally {
currentStream.setObserver(null);
try {
currentStream.dispose();
} catch (CaptureException e) {
log.error("Attempt to dispose capture stream failed.");
e.printStackTrace();
}
currentStream = null;
}
}
}
/** Starts streaming of the selected camera if the required resolution is supported. */
public synchronized void playStream() {
if (getActiveCamera() != null) {
CaptureStream stream = getActiveCamera().getCaptureStream();
if (stream != null) {
try {
boolean gotValidFormat = false;
for (VideoFormat v : stream.enumVideoFormats()) {
if (v.getWidth() == VIDEO_WIDTH && v.getHeight() == VIDEO_HEIGHT) {
stream.setVideoFormat(v);
log.info(
"Selected capture format: "
+ v.getWidth()
+ "x"
+ v.getHeight()
+ " - "
+ v.getFPS()
+ " fps - "
+ v.getFormatType()
+ "("
+ VideoFormat.RGB24
+ " RGB24, "
+ VideoFormat.RGB32
+ " RGB32)");
gotValidFormat = true;
break;
}
}
if (!gotValidFormat) {
log.error(
"Selected capture device does not support the required resolution: "
+ VIDEO_WIDTH
+ " x "
+ VIDEO_HEIGHT
+ " px");
}
stream.setObserver(observer);
stream.start();
currentStream = stream;
} catch (CaptureException e) {
log.error("Attempt to play capture stream failed.");
e.printStackTrace();
}
}
}
}