/* * @(#)DataSource.java	1.2 01/03/02 * * Copyright (c) 1999-2001 Sun Microsystems, Inc. All Rights Reserved. * * Sun grants you ("Licensee") a non-exclusive, royalty free, license to use, * modify and redistribute this software in source and binary code form, * provided that i) this copyright notice and license appear on all copies of * the software; and ii) Licensee does not utilize the software in a manner * which is disparaging to Sun. * * This software is provided "AS IS," without a warranty of any kind. ALL * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY * IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR * NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE * LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING * OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS * LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, * INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER * CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF * OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE * POSSIBILITY OF SUCH DAMAGES. * * This software is not designed or intended for use in on-line control of * aircraft, air traffic, aircraft navigation or aircraft communications; or in * the design, construction, operation or maintenance of any nuclear * facility. Licensee represents and warrants that it will not use or * redistribute the Software for such purposes. */package com.sun.media.protocol.screen;import javax.media.Time;import javax.media.MediaLocator;import javax.media.protocol.*;import java.io.IOException;/** * This DataSource captures live frames from the screen. * You can specify the location, size and frame rate in the * URL string as follows: * screen://x,y,width,height/framespersecond * Eg: *    screen://20,40,160,120/12.5 * Note: *    Requires JDK 1.3+ to compile and run */public class DataSource extends PushBufferDataSource {    protected Object [] controls = new Object[0];    protected boolean started = false;    protected String contentType = "raw";    protected boolean connected = false;    protected Time duration = DURATION_UNBOUNDED;    protected LiveStream [] streams = null;    protected LiveStream stream = null;        public DataSource() {    }        public String getContentType() {	if (!connected){            System.err.println("Error: DataSource not connected");            return null;        }	return contentType;    }    public void connect() throws IOException {	 if (connected)            return;	 connected = true;    }    public void disconnect() {	try {            if (started)                stop();        } catch (IOException e) {}	connected = false;    }    public void start() throws IOException {	// we need to throw error if connect() has not been called        if (!connected)            throw new java.lang.Error("DataSource must be connected before it can be started");        if (started)            return;	started = true;	stream.start(true);    }    public void stop() throws IOException {	if ((!connected) || (!started))	    return;	started = false;	stream.start(false);    }    public Object [] getControls() {	return controls;    }    public Object getControl(String controlType) {	return null;    }    public Time getDuration() {	return duration;    }    public PushBufferStream [] getStreams() {	if (streams == null) {	    streams = new LiveStream[1];	    stream = streams[0] = new LiveStream(getLocator());	}	return streams;    }}