videoviewer.java

Its video trNSMITT FILE USING JMF

/*  VideoViewer.java
 *
 *	Responsible for creating a panel for operating display of videos.	
 *
 *  Copyright (C) 2002 by Frank McCown
 *  University of Arkansas at Little Rock
 *  July 2002
 */

import javax.swing.*;
import javax.media.*;
import com.sun.media.ui.*;
import javax.media.protocol.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;
import java.sql.*;
import java.util.*;

import rowc.*;


public class VideoViewer extends JPanel
{
	public static JCheckBox watchCheckBox;
	public static JLabel lblInfo;
	private static JComboBox locationsComboBox;  // List of available web cams
	
	public static VideoControlPanel videoControl;	
	private static ControllerVideoPanel videoPanel = null;
	private VideoArchivePanel archivePanel;
	
	private static String currentLocation = "";
	private String archiveCurrentLocation = "";
	
	// Indicates if video is currently being played in viewer
	public static boolean videoPlaying = false;  
	
	// Indicates if video is currently being recorded
	public static boolean recording = false;

	public static rowc.CamManager camManager;
	
 	public static final int MIN_RECORDING_TIME = 1;  // Min recording time in seconds
 	public static final int MAX_RECORDING_TIME = 30;
 	
 	
 	
	public VideoViewer()
	{		
		// Register callback so addWebCam and removeWebCam methods are called by Server
		CamControllerCallback callback = (new CamControllerCallbackImpl())._this(CamController.orb);
		CamController.regObject.addCamController(CamController.hostName, callback);
		
		MediaArchiveCallback mediaCallback = (new MediaArchiveCallbackImpl())._this(CamController.orb);
		CamController.mediaStore.addMediaArchiveListener(CamController.hostName, mediaCallback);
		
		setLayout(new GridBagLayout());

		//lblItem = new JLabel();
		videoPanel = new ControllerVideoPanel();
		JScrollPane scroller = new JScrollPane(videoPanel);


		lblInfo = new JLabel();
		lblInfo.setForeground(Color.red);
				
		locationsComboBox = new JComboBox();
		populateLocationsComboBox();
				
		locationsComboBox.addItemListener(
			new ItemListener()
			{
				public void itemStateChanged(ItemEvent e)
				{
					if (e.getStateChange() == ItemEvent.SELECTED)
					{
						//stopCamViewer();
						if (videoPlaying)
							watchCheckBox.setSelected(false);
						
						Object obj = locationsComboBox.getSelectedItem();
						if (obj != null)
							currentLocation = obj.toString();
						else
						  currentLocation = "";
						
						System.out.println("Selected location " + currentLocation);
						
						lblInfo.setText("");
					}
				}
			}
		);

		// Movement checkbox
		watchCheckBox = new JCheckBox("Watch", false);	
		watchCheckBox.addItemListener(new ItemListener()
		{
			public void itemStateChanged(ItemEvent e)
			{
				//System.out.println("Watch itemStateChanged called.");
				if (e.getStateChange() == ItemEvent.SELECTED)
				{
					// Force to repaint?
			
					Object obj = locationsComboBox.getSelectedItem();
					if (obj != null)
					{
						currentLocation = obj.toString();
						if (!startCamViewer())
							watchCheckBox.setSelected(false);
					}
					else
					{
						// This could happen if location box is empty
					  currentLocation = "";
						showError("There is no location selected.");
						watchCheckBox.setSelected(false);
					}
				}
				else if (e.getStateChange() == ItemEvent.DESELECTED)
					stopCamViewer();
			}
		});	
			
		archivePanel = new VideoArchivePanel();
		videoControl = new VideoControlPanel();
	
		// GridBagConstraints(int gridx, int gridy, int gridwidth, int gridheight, double weightx, double weighty, 
		//   int anchor, int fill, Insets insets, int ipadx, int ipady) 
		
		// Add components to container
		add(scroller, new GridBagConstraints(0, 0, 1, 4, 1.0, 0.9,
            GridBagConstraints.CENTER, GridBagConstraints.BOTH, new Insets(5, 5, 5, 5), 217, 202));
		add(new JLabel("Location:"), new GridBagConstraints(1, 0, 1, 1, 0.0, 0.0,
            GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(0, 0, 0, 0), 0, 0));
		add(locationsComboBox, new GridBagConstraints(1, 1, 1, 1, 0.0, 0.0,
            GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL, new Insets(0, 0, 0, 0), 0, 0));
		add(watchCheckBox, new GridBagConstraints(1, 2, 1, 1, 0.0, 0.0,
            GridBagConstraints.CENTER, GridBagConstraints.NONE, new Insets(0, 0, 0, 0), 0, 0));
		add(videoControl, new GridBagConstraints(1, 3, 1, 1, 0.0, 0.0,
            GridBagConstraints.CENTER, GridBagConstraints.NONE, new Insets(0, 0, 0, 0), 0, 0));
		add(lblInfo, new GridBagConstraints(0, 6, 2, 1, 0.0, 0.0,
            GridBagConstraints.CENTER, GridBagConstraints.NONE, new Insets(0, 0, 0, 0), 0, 0));
		add(archivePanel, new GridBagConstraints(0, 4, 2, 1, 1.0, 1.0,
            GridBagConstraints.CENTER, GridBagConstraints.BOTH, new Insets(5, 0, 0, 5), 0, 0));
	}

	public void startRecording(int maxTime)
	{
		// Start recording and have it sent here
		
		if (!getCamManagerForLocation())
			return;
		
		recording = true;		
		lblInfo.setText("Recording...");
		
		// Register callback so newRecording method is called
		CamVideoCallback callback = (new CamVideoCallbackImpl())._this(CamController.orb);
				
		if (!camManager.startRec(maxTime, callback))
		{
			showError("Unable to start recording... Cam Processor is busy.");
			lblInfo.setText("");
			return;
		}
	}

	private void stopRecording()
	{
		// Tell cam manager to stop recording and store video on Server.
		camManager.stopRec();
	}
	
	public static void terminate()
	{
		// Notify Server that we're terminating so it takes us off its notification list
		CamController.regObject.removeCamController(CamController.hostName);
	}
	
	private boolean startCamViewer()
	{
		videoPlaying = false;
		
		if (!getCamManagerForLocation())
			return false;
				
		lblInfo.setText("Loading media...");
		
		try
		{
			// Register callback so videoAvailable method is called
			CamVideoCallback callback = (new CamVideoCallbackImpl())._this(CamController.orb);
					
			// Tell cam to start RTP transmission to this computer.
			if (!camManager.startTransmission(CamController.hostName, callback))
			{
				showError("Could not watch because Cam Controller is busy.");
				watchCheckBox.setSelected(false);
				lblInfo.setText("");
				return false;
			}
		}
		catch (org.omg.CORBA.TRANSIENT e)
		{
			e.printStackTrace();
			showError("The web cam is unavailable.  Unable to view video.");
			lblInfo.setText("");
			return false;
		}
		
		return true;
	}
	
	public static void stopCamViewer()
	{
		System.out.println("stopCamViewer");
		
		try
		{
			if (camManager != null && videoPlaying)
			{
				System.out.println("STOPPING TRANSMISSION");
				videoPanel.stop();
				camManager.stopTransmission();
				
				videoPlaying = false;
			}
		}
		catch (org.omg.CORBA.TRANSIENT ex)
		{
			System.out.println(ex);
			showError("It appears that the CamManager being used is no longer available.");
		}
		catch (Exception ex)
		{
			ex.printStackTrace();
		}
	
	}
	
	public static boolean getCamManagerForLocation()
	{
		try 
		{
			// Find CamManager for specific location; Obj ref is stored in Naming Service
	    org.omg.CosNaming.NameComponent[] camManagerNC = new org.omg.CosNaming.NameComponent[1];
	    String camName = "CamManager_" + currentLocation;
	    camManagerNC[0] = new org.omg.CosNaming.NameComponent(camName,"");
	    camManager = rowc.CamManagerHelper.narrow(CamController.nc.resolve(camManagerNC));
	 	}
	 	catch (org.omg.CosNaming.NamingContextPackage.NotFound ex)
	 	{
	 		showError("Error retrieving media from the selected location.\n" +
					"Make sure the cam software is running for the selected web cam.");
			return false;
	 	}
	 	catch (Exception ex)
	 	{
	 		ex.printStackTrace();
			showError("Error retrieving media from the selected location.");
			return false;
	 	}
	 	return true;
	}	
	 	

	private void populateLocationsComboBox()
	{
			// Location combo box- Retrieve locations from DB
		if (CamController.connectedToServer)
		{
			try	
			{
				System.out.println("Retrieving locations from server...");
				String[] loc = CamController.regObject.getLocations();
							
				// If first slot is empty, there are no locations available
				if (!loc[0].equals(""))
				{
					locationsComboBox = new JComboBox(loc);
					currentLocation = loc[0];
				}
			}
			catch (Exception e)	
			{
				System.out.println("Unable to get locations from Server.");
				lblInfo.setText("No locations available.");
			}
		}
	}
		
	private static boolean locationIsKnown(String location)
	{
		// Return true if location is already known about (in combo box)
		for (int i = 0; i < locationsComboBox.getItemCount(); i++)
		{
			String loc = (String) locationsComboBox.getItemAt(i);
			if (location.compareToIgnoreCase(loc) == 0)
				return true;
		}
		return false;		
	}

	
	public static void showError(String error)
	{
		JOptionPane.showMessageDialog(null, error, "Cam Controller Error",
						JOptionPane.ERROR_MESSAGE);
	}
		


	/***************************************************************************
	 *
	 * Inner class responsible for GUI for controlling video portion of web cam
	 *
	 ***************************************************************************/
	
	class VideoControlPanel extends JPanel
	{
		private JButton openFileButton, startButton, stopButton;
		private JTextField maxRecTimeTextField;
		
		private FileDialog fd = null;
		
		
		public VideoControlPanel()
		{
			setLayout(new GridBagLayout());
								
			ControlButtonHandler handler = new ControlButtonHandler();
			
			startButton = new JButton("Start");
			startButton.addActionListener(handler);
			
			stopButton = new JButton("Stop");
			stopButton.addActionListener(handler);
			
			// Allow user to enter maximum number of seconds to record
			maxRecTimeTextField = new JTextField("4", 4);
		
			openFileButton = new JButton("Open File...");
			openFileButton.addActionListener(handler);
	
			
			add(new JLabel("Recording:"), new GridBagConstraints(0, 0, 2, 1, 0.0, 0.0,
	            GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(0, 0, 0, 0), 0, 0));
		
			add(startButton, new GridBagConstraints(0, 1, 1, 1, 0.0, 0.0,
	            GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(0, 0, 10, 0), 0, 0));
			add(stopButton, new GridBagConstraints(1, 1, 1, 1, 0.0, 0.0,
	            GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(0, 0, 10, 0), 0, 0));
		
			add(new JLabel("Max recording time:"), new GridBagConstraints(0, 2, 2, 1, 0.0, 0.0,
	            GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(0, 0, 0, 0), 0, 0));
		
			add(maxRecTimeTextField, new GridBagConstraints(0, 3, 1, 1, 0.0, 0.0,
	            GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(0, 0, 10, 0), 0, 0));
			add(new JLabel("Seconds"), new GridBagConstraints(1, 3, 1, 1, 0.0, 0.0,
	            GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(0, 3, 10, 0), 0, 0));
		
			add(openFileButton, new GridBagConstraints(0, 4, 1, 1, 0.0, 0.0,
	            GridBagConstraints.CENTER, GridBagConstraints.NONE, new Insets(0, 0, 0, 0), 0, 0));
	
		}
				
		
		public int getMaxRecTime()
		{
			int time;
			
			try
			{
				time = Integer.parseInt(maxRecTimeTextField.getText());
			}
			catch (NumberFormatException e)
			{
				time = MIN_RECORDING_TIME - 1;
			}
		
			return time;