?? datasource.java
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/* * @(#)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; }}
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