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VlcjDevice.java
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VlcjDevice.java
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package com.github.sarxos.webcam.ds.vlcj;
import java.awt.Dimension;
import java.awt.image.BufferedImage;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import uk.co.caprica.vlcj.medialist.MediaListItem;
import uk.co.caprica.vlcj.player.MediaPlayer;
import uk.co.caprica.vlcj.player.MediaPlayerFactory;
import com.github.sarxos.webcam.WebcamDevice;
import com.github.sarxos.webcam.WebcamException;
/**
* NOT STABLE, EXPERIMENTAL STUFF!!!
*
* @author Bartosz Firyn (SarXos)
*/
public class VlcjDevice implements WebcamDevice {
private static final Logger LOG = LoggerFactory.getLogger(VlcjDevice.class);
/**
* Artificial view sizes. In future this should be read from media item.
*/
//@formatter:off
private final static Dimension[] DIMENSIONS = new Dimension[] {
new Dimension(320, 240),
};
//@formatter:on
//@formatter:off
private final static String[] VLC_ARGS = {
// VLC args by Andrew Davison:
// http://fivedots.coe.psu.ac.th/~ad/jg/nui025/snapsWithoutJMF.pdf
// ... have no idea what is this ...
"--intf",
// no interface
"dummy",
// ... have no idea what is this ...
"--vout",
// no video output
"dummy",
// no audio decoding
"--no-audio",
// do not display title
"--no-video-title-show",
// no stats
"--no-stats",
// no subtitles
"--no-sub-autodetect-file",
// no snapshot previews
"--no-snapshot-preview",
// reduce capture lag/latency
"--live-caching=50",
// turn off warnings
"--quiet",
};
//@formatter:on
private Dimension size = null;
private MediaListItem item = null;
private MediaPlayerFactory factory = null;
private MediaPlayer player = null;
private volatile boolean open = false;
private volatile boolean disposed = false;
public VlcjDevice(MediaListItem item) {
this.item = item;
}
private String getCapDevice() {
String os = System.getProperty("os.name").toLowerCase();
if (os.indexOf("win") >= 0) {
return "dshow://";
} else if (os.indexOf("mac") >= 0) {
return "qtcapture://";
} else if (os.indexOf("nix") >= 0 || os.indexOf("nux") >= 0) {
return "v4l2://";
} else {
throw new RuntimeException("Not implemented");
}
}
@Override
public String getName() {
return item.name();
}
@Override
public Dimension[] getSizes() {
return DIMENSIONS;
}
@Override
public Dimension getSize() {
return size;
}
@Override
public void setSize(Dimension size) {
this.size = size;
}
@Override
public BufferedImage getImage() {
if (!open) {
throw new WebcamException("Cannot get image, player is not open");
}
return player.getSnapshot();
}
@Override
public synchronized void open() {
if (disposed) {
LOG.warn("Cannot open device because it has been disposed");
return;
}
if (open) {
return;
}
LOG.info("Opening webcam device");
factory = new MediaPlayerFactory(VLC_ARGS);
player = factory.newHeadlessMediaPlayer();
// for nix systems this should be changed dshow -> ... !!
String[] options = {
":dshow-vdev=" + item.name(),
":dshow-size=" + size.width + "x" + size.height,
":dshow-adev=none", // no audio device
};
player.startMedia(getCapDevice(), options);
// wait for images
int max = 0;
do {
BufferedImage im = player.getSnapshot(size.width, size.height);
if (im != null && im.getWidth() > 0) {
open = true;
LOG.info("Webcam device is now open: " + getName());
return;
}
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
}
} while (max++ < 10);
player.release();
factory.release();
open = false;
}
@Override
public synchronized void close() {
if (!open) {
return;
}
LOG.info("Closing");
player.release();
factory.release();
open = false;
}
@Override
public synchronized void dispose() {
disposed = true;
}
}