imageproducer.java

java在网页中操作摄像头的源码,质量清晰,可进行语音

/*
 * WebCam Producer
 *
 * Copyright (C) 2004  Didier Donsez
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * Contact: Didier Donsez ([e-mail])
 * Contributor(s):
 *
**/
package fr.imag.adele.bundle.webcamproducer.impl;

import jmfdemo.FrameGrabber;

import org.osgi.framework.BundleContext;
import org.osgi.service.wireadmin.Producer;
import org.osgi.service.wireadmin.Wire;

public class ImageProducer implements Producer {

	private Wire wires[];
	private BundleContext context;

	protected FrameGrabber frameGrabber;

	public ImageProducer(BundleContext context, FrameGrabber frameGrabber) {
		this.context = context;
		this.frameGrabber=frameGrabber;
	}
	
	public synchronized void consumersConnected(Wire wires[]){
		this.wires = wires;
	}

	public Object polled(Wire wire) {
		trace("polled()");
		if(wire==null) {
			trace(wire==null?wire.toString():"null wire");
			return null;
		} 
		Class clazzes[] = wire.getFlavors();
		if(clazzes==null){
			trace(wire==null?wire.toString():"null flavors");
			 return null;
		}
		for ( int i=0; i<clazzes.length; i++ ) {
			Class clazz = clazzes[i];
			if ( clazz.isAssignableFrom( java.awt.Image.class ) ){
				return frameGrabber.getImage();
			}
		}
		trace("no class match");		
		return null;
	}
	private void trace(String msg){
		if(false) System.err.println(getClass().getName()+":"+msg);
	}

}