devicesfinder.java~2~

能够检测到人脸

package visage_v3_2;

import javax.media.*;
import javax.media.protocol.*;
import javax.media.control.FormatControl;
import javax.media.format.VideoFormat;
import java.awt.*;
import java.util.Vector;
import javax.swing.JOptionPane;

/*
  This class opens a video capture device and reads frames in the given format.
  ALL THE CODE WRITTEN HERE IS TAKEN FROM Amith Yamasani'S 'VideoPreview' CODE SAMPLE, SLIGHT MODIFICATIONS WHERE MADE.
*/

public class DevicesFinder implements BufferTransferHandler
{
    public DevicesFinder(){}

    public PushBufferDataSource findDevices(Frame frame)
    {
      PushBufferDataSource pbds = null;
      // Preferred capture format parameters
      String prefEncoding = "RGB";
      float prefFPS = 30.0f;
      Dimension prefSize = new Dimension(320, 240);

      VideoFormat prefFormat = new VideoFormat(prefEncoding,prefSize,Format.NOT_SPECIFIED,null,prefFPS);
      Vector devices = CaptureDeviceManager.getDeviceList(prefFormat);

      if (devices.size() < 1)
      {
        JOptionPane.showMessageDialog(frame,
            "No capture devices found, or devices does not support given format\n" +
                                      prefFormat.toString(), null,
                                      JOptionPane.ERROR_MESSAGE);
        System.exit(-1);
      }

      CaptureDeviceInfo cdi = (CaptureDeviceInfo)devices.elementAt(0);
      frame.cdi = cdi;

      try
      {
        DataSource ds = Manager.createDataSource(cdi.getLocator());
        if (ds instanceof CaptureDevice)
        {
          FormatControl[] fcs = ( (CaptureDevice) ds).getFormatControls();
          for (int i = 0; i < cdi.getFormats().length; i++)
          {
            VideoFormat vf = (VideoFormat) cdi.getFormats()[i];
            if (vf.matches(prefFormat))
            {
              prefFormat = (VideoFormat) vf.intersects(prefFormat);
              fcs[0].setFormat(prefFormat);
              break;
            }
          }
        }
        ds.connect();
        pbds = (PushBufferDataSource) ds;
        pbds.getStreams()[0].setTransferHandler(this);
        pbds.start();
        return pbds;
      }
      catch (Exception e)
      {
        JOptionPane.showMessageDialog(frame,"Could not connect to capture device, please check your webcam",null,JOptionPane.ERROR_MESSAGE);
        System.exit(-1);
        return null;
      }
    }

    public void transferData(PushBufferStream pbs) {
    }


}