Java ME, take a snapshot from a playing video

The following code will give you a demonstration on how to take a snapshot from a playing video.

Preconditions,
resource available at "/mmawtk.mpeg";

VideoSnapShotJPEG.java

/**//*
 * VideoSnapShotJPEG.java
 * Dec 24, 2007
 */
package midlet;

import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

import com.mot.lrt.midp.mmapi.Const;
import com.mot.lrt.midp.mmapi.video.FormVideoPlayer;

/** *//**
 * MIDlet to take a snapshot from a playing video
 * 
 * @author author
 * 
 */
public class VideoSnapShotJPEG extends MIDlet implements CommandListener ...{

    private Display display;

    private FormVideoPlayer vp;

    public VideoSnapShotJPEG() ...{
        // TODO Auto-generated constructor stub
    }

    protected void destroyApp(boolean arg0) ...{
        vp.closePlayer();
        super.notifyDestroyed();

    }

    protected void pauseApp() ...{
        // TODO Auto-generated method stub

    }

    protected void startApp() throws MIDletStateChangeException ...{
        if (display == null) ...{
            initUI();
        }
        vp = new FormVideoPlayer("/mmawtk.mpeg", "video/mpeg");
        vp.setCommandListener(this);
        display.setCurrent(vp);

        vp.openPlayer();
    }

    private void initUI() ...{
        display = Display.getDisplay(this);

    }

    public void commandAction(Command c, Displayable arg1) ...{
        if (Const.CMD_SNAPSHOT.equals(c)) ...{
            vp.snapshot();
        }
        if (Const.CMD_EXIT.equals(c)) ...{
            this.destroyApp(true);
        }

    }

}

FormVideoPlayer.java

/**//*
 * FormVideoPlayer.java
 * Dec 20, 2007 
 */
package com.vendor.dept.prj.subprj.video;

import java.io.IOException;
import java.io.InputStream;

import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.Image;
import javax.microedition.lcdui.ImageItem;
import javax.microedition.lcdui.Item;
import javax.microedition.media.Manager;
import javax.microedition.media.MediaException;
import javax.microedition.media.Player;
import javax.microedition.media.control.GUIControl;
import javax.microedition.media.control.VideoControl;

import com.vendor.dept.prj.subprj.Const;

/** *//**
 * Object of a video player
 * 
 * @author authorname
 * 
 */
public class FormVideoPlayer extends Form ...{

    private static final int LOOP = 5;

    static Player player = null;

    ImageItem img;

    int imgid;

    private InputStream is;

    int length;

    private String mimeType;

    private String uri;

    VideoControl vc;

    private Item vitem;

    /** *//**
     * @param string
     * 
     */
    public FormVideoPlayer(String URI, String type) ...{
        super(URI);

        this.mimeType = type;
        this.uri = URI;

        initUI();
    }

    void appf(String s) ...{
        System.out.println(s);
        this.append(s);
    }

    public void closePlayer() ...{
        if (player != null) ...{
            player.close();
            player = null;
        }

        if (is != null) ...{
            try ...{
                is.close();
            } catch (IOException e) ...{
                // ignored
            }
            is = null;
        }
    }

    private void initUI() ...{
        this.addCommand(Const.CMD_EXIT);
        addCommand(Const.CMD_SNAPSHOT);

        // byte []logo = readLogo();

        try ...{
            Image logo = Image.createImage(Const.URI_LOGO);
            img = new ImageItem("", logo, ImageItem.LAYOUT_CENTER, "");

        } catch (IOException e) ...{
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        imgid = append(img);

    }

    public void openPlayer() ...{
        appf(uri + ";" + mimeType);
        is = this.getClass().getResourceAsStream(uri);
        try ...{
            player = Manager.createPlayer(is, mimeType);

            player.setLoopCount(LOOP);

            appf("realizing");
            player.realize();

            vc = (VideoControl) player.getControl("VideoControl");
            if (vc != null) ...{
                vitem = (Item) vc.initDisplayMode(GUIControl.USE_GUI_PRIMITIVE,
                        null);
                append(vitem);
            }

            appf("prefetching");
            player.prefetch();

            appf("starting");
            player.start();

        } catch (IOException e) ...{
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (MediaException e) ...{
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }

    public void snapshot() ...{
        if (vc == null) ...{
            // fetal error
        }
        Thread t = new Thread() ...{
            public void run() ...{
                try ...{
                    byte[] b = vc.getSnapshot(Const.SNAP_ENCODING_JPEG);

                    length = b.length;
                    Image shot = Image.createImage(b, 0, length);
                    set(imgid, new ImageItem("", shot,
                            ImageItem.LAYOUT_DEFAULT, ""));
                } catch (MediaException e) ...{
                    appf(e.toString());
                }
            }
        };
        t.start();

    }

}

Const.java

/**//*
 * Const.java
 * Dec 20, 2007 
 */
package com.vendor.dept.prj.subprj;

import javax.microedition.lcdui.Command;

/** *//**
 * @author authorname
 * 
 */
public class Const ...{
    public static final Command CMD_EXIT = new Command("Exit", Command.EXIT, 0);

    public static final Command CMD_SNAPSHOT = new Command("Snap", Command.OK,
            1);

    public static final Command CMD_START = new Command("Start", Command.OK,
            2);

    public static final String SNAP_ENCODING_JPEG = "encoding=jpeg";

    public static final String URI_LOGO = "/j_32x32.jpg";
}