1    package video; 
2     
3    import gui.In; 
4    import j2d.ImageUtils; 
5    import net.multicast.McastUtil; 
6    import net.multicast.Utils; 
7     
8    import java.awt.AWTException; 
9    import java.awt.Rectangle; 
10   import java.io.IOException; 
11   import java.net.DatagramPacket; 
12   import java.net.InetAddress; 
13   import java.net.MulticastSocket; 
14    
15   /** 
16    * Copyright DocJava, inc. User: lyon 
17    * <p/> 
18    * Date: Nov 25, 2004 
19    * <p/> 
20    * Time: 6:24:58 AM 
21    */ 
22   public class BroadcastMain { 
23       private int port = 2435; 
24       private McastUtil mcu = new McastUtil(port); 
25    
26       public static void main(String[] args) { 
27           BroadcastMain bc = new BroadcastMain(); 
28       } 
29    
30       public  BroadcastMain() { 
31           mcu.setLoopBack(true); 
32           try { 
33               new BroadcastViewerThread(mcu); 
34               if (In.getBoolean("do you want to broadcast?")) 
35                   transmitData(); 
36           } catch (Exception err) { 
37               err.printStackTrace(); 
38           } 
39       } 
40    
41       private void transmitData() throws IOException, AWTException, InterruptedException { 
42           Rectangle rect = In.getRectangle("select a region to capture"); 
43           for (; ;) { 
44               final long now = System.currentTimeMillis(); 
45               byte b[] = ImageUtils.grabAPngImage(rect); 
46               mcu.sendBytes(b); 
47               long delta = System.currentTimeMillis() - now; 
48               final long minTime = 250; 
49               if (delta < minTime) 
50                   Thread.sleep(minTime - delta); 
51           } 
52       } 
53    
54       public void broadcastImages() { 
55           try { 
56               broadcastImages(In.getInt("select the number " + 
57                       "of images to capture")); 
58           } catch (IOException e) { 
59               e.printStackTrace(); 
60           } 
61       } 
62    
63       /** 
64        * broadcast png images using udp multicast packets. 
65        * 
66        * @param n number of images to send. 
67        * @throws java.io.IOException 
68        */ 
69       public void broadcastImages(int n) throws IOException { 
70           final InetAddress inetAddress = Utils.getInetAddress(); 
71           final int port = 1234; 
72           final Rectangle rect = In.getRectangle("select a capture area"); 
73           final MulticastSocket mcastSocket = 
74                   Utils.getMulticastSocket(port, inetAddress); 
75           for (int i = 0; i < n; i++) { 
76               try { 
77                   sendAnImage(mcastSocket, port, inetAddress, rect, i); 
78                   sleep(1000); 
79               } catch (IOException e) { 
80                   e.printStackTrace(); 
81               } catch (AWTException e) { 
82                   e.printStackTrace(); 
83               } 
84           } 
85           Utils.closeSocket(mcastSocket, inetAddress); 
86           System.out.println("done xmitting"); 
87       } 
88    
89       private static void sleep(long i) { 
90           try { 
91               Thread.sleep(i); 
92           } catch (InterruptedException e) { 
93               e.printStackTrace(); 
94           } 
95       } 
96    
97       private void sendAnImage(MulticastSocket mcastSocket, int port, 
98                                InetAddress inetAddress, 
99                                Rectangle rect, int i) 
100              throws IOException, AWTException { 
101          byte b[] = ImageUtils.grabAPngImage(rect); 
102          DatagramPacket dp = new DatagramPacket(b, 
103                  b.length, 
104                  inetAddress, 
105                  port); 
106          mcastSocket.send(dp); 
107          System.out.println("sent image:" + i); 
108      } 
109  } 
110