!7

// from https://github.com/vzhn/ffmpeg-java-samples/blob/master/src/main/java/WebcamCapture.java

/*lib 1400538

lib 1400539

lib 1400540

lib 1400541

lib 1400542

lib 1400543*/

lib 1400544 // javacpp ffmpeg examples for linux x64

import org.bytedeco.javacpp.avcodec;

import static org.bytedeco.javacpp.avcodec.av_packet_unref;

import static org.bytedeco.javacpp.avdevice.avdevice_register_all;

import static org.bytedeco.javacpp.avformat.*;

import static org.bytedeco.javacpp.avutil.*;

p { new WebcamCapture().start(); }

sclass WebcamCapture {

  public static final int WIDTH = 800;

  public static final int HEIGHT = 600;

  private Canvas canvas;

  private void start() throws IOException {

    JFrame frame = new JFrame();

    frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

    frame.setLayout(new BorderLayout());

    canvas = new Canvas();

    frame.add(canvas, BorderLayout.CENTER);

    frame.setVisible(true);

    frame.setSize(WIDTH, HEIGHT);

    startCapture();

  }

  private void startCapture() throws IOException {

    av_log_set_level(AV_LOG_VERBOSE);

    avdevice_register_all();

    AVInputFormat v4l2 = av_find_input_format("v4l2");

    if (v4l2 == null) {

      throw new RuntimeException("v4l2 not found");

    }

    AVFormatContext v4l2Device = avformat_alloc_context();

    if (v4l2Device == null) {

      throw new RuntimeException("failed to alloc AVFormatContext");

    }

    AVDictionary options = new AVDictionary();

    av_dict_set(options, "input_format", "mjpeg", 0);

    if(avformat_open_input(v4l2Device, "/dev/video0", v4l2, options) != 0) {

      throw new RuntimeException("Couldn't open input stream.\n");

    }

    av_dict_free(options);

    av_dump_format(v4l2Device, 0, "", 0);

    if (v4l2Device.nb_streams() == 0) {

      throw new RuntimeException("Stream not found!");

    }

    avcodec.AVPacket pkt = new avcodec.AVPacket();

    while (true) {

      av_read_frame(v4l2Device, pkt);

      byte[] data = new byte[pkt.size()];

      pkt.data().get(data);

      av_packet_unref(pkt);

      canvas.setImage(ImageIO.read(new ByteArrayInputStream(data)));

    }

  }

}

sclass Canvas extends JPanel {

  private BufferedImage bufferedImage;

  @Override

  public void paint(Graphics g) {

    Graphics2D g2d = (Graphics2D) g;

    if (bufferedImage != null) {

      g2d.drawImage(bufferedImage, 0, 0, null);

    }

  }

  public void setImage(BufferedImage bufferedImage) {

    this.bufferedImage = bufferedImage;

    repaint();

  }

}