/*

 * QuickTime for Java SDK Sample Code

 *

 * Usage subject to restrictions in SDK License Agreement

 * Copyright: © 2000 Apple Computer, Inc.

 */

import quicktime.streaming.*;

import quicktime.app.time.*;

import quicktime.*;

import quicktime.io.*;

/* The Broadcaster class can create and prepare a presentation from a QTFile representation of an SDP file

   Additionally, this class also creates a task thread that is responsible for taking care of idling tasks for

   the presentation object */

public class Broadcaster extends Tasking {

    private static TaskThread idleTasker = new TaskThread ("Broadcaster Idle Tasker", 20);

    public static final int kDefaultPresTimeScale = 600; // default time scale of the presenter

//_________________________ CLASS METHODS

    public Broadcaster( QTFile file ) throws QTException {

        try {

            MediaParams medParams = new MediaParams();

            PresParams presParams = new PresParams( kDefaultPresTimeScale, QTSConstants.kQTSSendMediaFlag | 

                    QTSConstants.kQTSAutoModeFlag | QTSConstants.kQTSDontShowStatusFlag, medParams );

            pres = Presentation.fromFile( file, presParams );

        } catch ( QTException e ) {

            e.printStackTrace();

        }

        setDefaultTasker (idleTasker);

     }

//_________________________ INSTANCE VARIABLES

    private Presentation pres;

//_________________________ INSTANCE METHODS

    /** This returns the PresentationDrawer's Presentation that is displayed by this drawable.

     * @return an Presentation

     */

    public Presentation getPresentation () { return pres; }

    /**

     * This method is called by the specified object when the instance of 

     * the class that implements this interface is added to the object

     * that is the source of the interest.

     * @param interest the object that is to be the source of interest for the

     * the object that implements this interface.

     */

    public void addedTo (Object interest) {}

    /**

     * This method is called by the specified object when the instance of 

     * the class that implements this interface is removed from the object

     * that is the source of the interest.

     * @param interest the object that was the source of interest for the

     * the object that implements this interface.

     */

    public void removedFrom (Object interest) {}

    /**

     *  Displays a settings dialog and prerolls the broadcast

     */

    public void prepareBroadcast( ) {

        try {

            SettingsDialog dialog = new SettingsDialog(pres);

            pres.preroll();

        } catch (QTException e) {

            e.printStackTrace();

        }

    }

    /**

     * This method starts the broadcast

     */

    public void startBroadcast( ) { 

        try {

            pres.start();

            startTasking();

        } catch (QTException e) {

            e.printStackTrace();

        }

    }

    /**

     * This method stops the broadcast

     */

    public void stopBroadcast() {

        try {

            pres.stop();

            stopTasking();

        } catch (QTException e) {

            e.printStackTrace();

        }

    }

    /**

     * This method performs idle processing for the Presentation and will be automatically

     * called if this object is added to the TaskThread object.

     * @see quicktime.util.TaskThread

     */

    public synchronized final void task() throws QTException {

        pres.idle(null);

    }

    /** Returns a String representation of this object */

    public String toString () {

        return getClass().getName() + "[" + pres + "]";

    }

}