!7

lib 1008985 // webcam

lib 1008987 // bridj

lib 1004016 // slf4j api

import com.github.sarxos.webcam.Webcam;

/**

 * @author Bartosz Firyn (SarXos)

 */

p {

  time "list webcams" {

    L<Webcam> webcams = new L(Webcam.getWebcams());

  }

  // NOTE!

  /*

   * Yes, I know we could do this in one loop, but I wanted to prove here

   * that it's possible to have many native webcams open in the same time.

   * I tested this example with 4 webcams simultaneously connected to the

   * USB bus - 1 x PC embedded device, and 3 x UVC devices connected to

   * the USB concentration hub, which was connected to the USB 2.0 port.

   * It's working like a charm.

   */

  // USB BANDWIDTH!

  /*

   * As you probably know the USB has limited bandwidth and therefore it

   * may not be possible to transfer images from as many cameras as you

   * would like to wish. This example works when I'm using QQVGA (176x144)

   * but fails with the error message when I want to fetch VGA (640x480).

   */

  // open all at once (this is the most time-consuming operation, all

  // others are executed instantly)

  for i, Webcam webcam over webcams: { try {

  	System.out.format("Opening %s\n", webcam.getName());

  	time "Opening webcam" {

  	  webcam.open();

  	}

  } catch e {

    print("Can't open webcam " + webcam.getName() + " - " + silentException(e));

    webcams.remove(i--);

  }}

  new L<Pair<S, BufferedImage>> images;

  // capture picture from all of them

  for (int i = 0; i < webcams.size(); i++) pcall {

  	Webcam webcam = webcams.get(i);

  	S name = webcam.getName();

  	System.out.format("Capturing %s\n", name);

  	time "Capturing image" {

  	  images.add(pair(name, webcam.getImage()));

  	}

  }

  // close all

  time "Closing webcams" {

    for (Webcam webcam : webcams) {

    	System.out.format("Closing %s\n", webcam.getName());

  	  webcam.close();

    }

  }

  for (Pair<S, BufferedImage> p : images)

    showImage(p.a, p.b);

}