videoplayer.java

看看如何用j2me 制作自己的媒体播放器。 附带直接运行文件

/*
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
package example.mmademo;

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.media.*;
import javax.microedition.media.control.*;
import java.io.*;

/**
 * Play Video/Capture in a Form using MMAPI
 *
 */
public class VideoPlayer extends Form
    implements Runnable, CommandListener, PlayerListener {

    private static final String TITLE_TEXT = "MMAPI Video Player";

    private static Player player = null;
    private static boolean isCapturePlayer;

    private static Image logo = null;
    private int idx = 0;
    private Display parentDisplay;
    private long duration;
    private final Command backCommand = new Command("Back", Command.BACK, 1);
    private final Command playCommand = new Command("Play", Command.ITEM, 1);
    private final Command snapCommand = new Command("Snapshot", Command.ITEM, 1);
    private final Command pauseCommand = new Command("Pause", Command.ITEM, 10);
    private Item videoItem;
    private StringItem status;
    private StringItem audioStatus;
    private StringItem time;
    private VolumeControl vc;
    private RateControl rc;
    private Thread th;
    private int currentVolume;
    private boolean muted;
    private int currentRate = 100000;
    private VideoControl vidc;

    // pause/resume support
    private boolean suspended = false;
    private boolean restartOnResume = false;
    private long restartMediaTime;
     boolean snapshot;

    public VideoPlayer(Display parentDisplay, boolean snapshot) {
        super(TITLE_TEXT);
        this.idx = 0;
        this.snapshot= snapshot;
        this.parentDisplay = parentDisplay;
        initialize();
    }

    void initialize() {
        addCommand(backCommand);
        if (snapshot)
            addCommand(snapCommand);
        setCommandListener(this);

        try {
	    if (logo == null)
		logo = Image.createImage("/icons/logo.png");
        } catch (Exception ex) {
            logo = null;
        }
        if ( logo == null)
            System.out.println("can not load logo.png");

    }

    /*
     * Respond to commands, including back
     */
    public void commandAction(Command c, Displayable s) {
        //try {
            if (s == this) {
                if (c == backCommand) {
                    close();
                    parentDisplay.setCurrent(VideoTest.getList());
                } else if (videoItem != null && c == snapCommand) {
                    doSnapshot();
                } else if (videoItem == null && c == pauseCommand) {
                    removeCommand(pauseCommand);
                    addCommand(playCommand);
                    pause();
                } else if (videoItem == null && c == playCommand) {
                    start();
                    removeCommand(playCommand);
                    addCommand(pauseCommand);
                }
            }
        //} catch (Exception e) {
        //    System.out.println("DEBUG: GOT EXCEPTION in VideoPlayer.commandAction("+c.toString()+","+s.toString()+")!");
        //    e.printStackTrace();
        //}
    }

    public void run() {
        //try {
            while (player != null) {

                // sleep 200 millis. If suspended, 
                // sleep until MIDlet is restarted
                do {
                    try {
                        Thread.sleep(200);
                    } catch (InterruptedException ie) {
                    }
                } while (player != null && suspended);

                synchronized (this) {
                    if (player == null)
                        return;
                    if (vc !=  null) {
                        if (vc.getLevel() != currentVolume || vc.isMuted() != muted) {
                            muted = vc.isMuted();
                            currentVolume = vc.getLevel();
                            audioStatus.setText("Volume: " + currentVolume + "% " +
                            (muted?" (muted)":""));
                        }
                    }
                    if (rc != null) {
                        if (rc.getRate() != currentRate) {
                            currentRate = rc.getRate();
                            updateStatus();
                        }
                    }
                    long k = player.getMediaTime();
                    time.setText("Pos: " + (k / 1000000) + "." + ((k / 10000) % 100));
                }
            }
        //} catch (Exception e) {
        //    System.out.println("DEBUG: GOT EXCEPTION in VideoPlayer.run()!");
        //    e.printStackTrace();
        //}
    }

    public void open(String url) {
        try {
            synchronized (this) {
                if ( player == null ) {
                    if (url.startsWith("resource:")) {
                        InputStream ins = getClass().getResourceAsStream(url.substring(9));
                        String ct = Utils.guessContentType(url);
                        player = Manager.createPlayer(ins, ct);
                    } else {
                        player = Manager.createPlayer(url);
                    }
                    player.addPlayerListener(this);
        		    isCapturePlayer = url.startsWith("capture:");
                }
            }
            player.realize();
            if ((vidc = (VideoControl) player.getControl("VideoControl")) != null) {
                videoItem = (Item)vidc.initDisplayMode(VideoControl.USE_GUI_PRIMITIVE, null);
                //vidc.setDisplaySize(240, 140);
            } else if (logo != null) {
                append(new ImageItem("", logo, ImageItem.LAYOUT_CENTER,""));
            }
            Control [] controls = player.getControls();

            for (int i = 0; i < controls.length; i++) {
                if (controls[i] instanceof GUIControl && controls[i] != vidc) {
                    append((Item) controls[i]);
                }
                if (controls[i] instanceof VolumeControl) {
                    vc = (VolumeControl) controls[i];
                }
                if (controls[i] instanceof RateControl) {
                    rc = (RateControl) controls[i];
                }
            }
            status = new StringItem("Status: ","");
    	    status.setLayout(Item.LAYOUT_NEWLINE_AFTER);
            append(status);
            if (vc != null) {
                audioStatus = new StringItem("", "Volume:");
            	audioStatus.setLayout(Item.LAYOUT_NEWLINE_AFTER);
                append(audioStatus);
            }
            time = new StringItem("","");
            time.setLayout(Item.LAYOUT_NEWLINE_AFTER);
            append(time);
            player.prefetch();
            if (videoItem == null)
                addCommand(pauseCommand);
            else {
                Spacer spacer = new Spacer(3, 10);
                spacer.setLayout(Item.LAYOUT_NEWLINE_BEFORE);
                append(spacer);
                append(videoItem);
    	    }
            Thread t = new Thread(this);
            t.start();
        } catch (Exception me) {
            System.err.println(me);
            close();
        }
    }

    public void start() {
        if (player == null)
            return;
        try {
            duration = player.getDuration();
            player.start();
        } catch (Exception ex) {
            System.err.println(ex);
            close();
        }
    }

    public void close() {
        synchronized (this) {
            pause();
            if (player != null) {
                player.close();
                player = null;
            }
        }
        VideoTest.getInstance().nullPlayer();
    }

    public void pause() {
        if ( player != null)  {
            try {
                player.stop();
            } catch (MediaException me) {
            	System.err.println(me);
            }
        }
    }

    private synchronized void updateStatus() {
        if (player == null)
            return;
        status.setText(
            ((player.getState() == Player.STARTED) ? "Playing, ": "Paused, ") +
           "Rate: " + (currentRate/1000) + "%\n");
    }

    public void playerUpdate(Player plyr, String evt, Object evtData) {
        //try {
            if ( evt == END_OF_MEDIA ) {
                try {
                    player.setMediaTime(0);
                    player.start();
                } catch (MediaException me) {
                    System.err.println(me);
                }
            } else if (evt == STARTED || evt == STOPPED) {
                updateStatus();
            }
        //} catch (Exception e) {
        //    System.out.println("DEBUG: GOT EXCEPTION in VideoPlayer.playerUpdate("+evt.toString()+")!");
        //    e.printStackTrace();
        //}
    }

    private void doSnapshot() {
        new SnapshotThread().start();
    }
    
    class SnapshotThread extends Thread {
        public void run() {
            try {
                byte [] snap = vidc.getSnapshot("encoding=png");
                if (snap != null) {
                    Image im = Image.createImage(snap, 0, snap.length);
                    ImageItem imi = new ImageItem("", im, 0, "");
                    append(imi);
                }
            } catch (MediaException me) {
                System.err.println(me);
            //} catch (Exception e) {
            //    System.out.println("DEBUG: GOT EXCEPTION in VideoPlayer.SnapshotThread.run()!");
            //    e.printStackTrace();
            }
        }
    }

    public synchronized void stopVideoPlayer() {
        // stop & deallocate
    	player.deallocate();
    }

    /**
     * Deallocate the player and the display thread.
     * Some VM's may stop players and threads
     * on their own, but for consistent user
     * experience, it's a good idea to explicitely
     * stop and start resources such as player
     * and threads.
     */
    public synchronized void pauseApp() {
        suspended = true;
        if (player != null && player.getState() >= Player.STARTED) {
            // player was playing, so stop it and release resources.
            if (!isCapturePlayer) {
                restartMediaTime = player.getMediaTime();
            }
            player.deallocate();
            // make sure to restart upon resume
            restartOnResume = true;
        } else {
            restartOnResume = false;
        }
    }
	
    /**
     * If the player was playing when the MIDlet was paused,
     * then the player will be restarted here.
     */
    public synchronized void startApp() {
        suspended = false;
        if (player != null && restartOnResume) {
            try {
            player.prefetch();
            if (!isCapturePlayer) {
                try {
                    player.setMediaTime(restartMediaTime);
                } catch (MediaException me) {
                    System.err.println(me);
                }
            }
            player.start();
            } catch (MediaException me) {
                System.err.println(me);
            }
        }
        restartOnResume = false;
    }
}