PlayMediaScreen.java

package lancs.mobilemedia.core.ui.screens;
import java.io.InputStream;
import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.Gauge;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Item;
import javax.microedition.lcdui.ItemStateListener;
import javax.microedition.media.Manager;
import javax.microedition.media.Player;
import javax.microedition.media.control.PitchControl;
import javax.microedition.media.control.TempoControl;
import javax.microedition.media.control.VolumeControl;
import lancs.mobilemedia.core.ui.MainUIMidlet;
import lancs.mobilemedia.core.ui.controller.AbstractController;
import de.ovgu.cide.jakutil.*;
public class PlayMediaScreen extends Canvas implements ItemStateListener {
  public static final Command start=new Command("Start",Command.BACK,0);
  public static final Command back=new Command("Back",Command.ITEM,1);
  public static final Command stop=new Command("Stop",Command.ITEM,1);
  Player midiPlayer=null;
  VolumeControl volControl=null;
  PitchControl pitchControl=null;
  TempoControl tempoControl=null;
  Form form=null;
  Gauge volGauge=null;
  Gauge pitchGauge=null;
  Gauge tempoGauge=null;
  public PlayMediaScreen(  MainUIMidlet midlet,  InputStream storedMusic,  String type,  AbstractController controller){
    try {
      midiPlayer=Manager.createPlayer(storedMusic,type);
      midiPlayer.prefetch();
      volControl=(VolumeControl)midiPlayer.getControl("javax.microedition.media.control.VolumeControl");
      pitchControl=(PitchControl)midiPlayer.getControl("javax.microedition.media.control.PitchControl");
      tempoControl=(TempoControl)midiPlayer.getControl("javax.microedition.media.control.TempoControl");
      form=new Form("MIDI Player",null);
      form.addCommand(back);
      form.addCommand(start);
      form.addCommand(stop);
      this.hook55();
      form.setCommandListener(controller);
      volGauge=new Gauge("Volume: 50",true,100,50);
      tempoGauge=new Gauge("Tempo: 120",true,30,12);
      pitchGauge=new Gauge("Pitch: 0",true,10,5);
      form.append(volGauge);
      form.append(tempoGauge);
      form.append(pitchGauge);
      form.setItemStateListener(this);
      Display.getDisplay(midlet).setCurrent(form);
    }
 catch (    Exception e) {
      System.err.println(e);
    }
  }
  public void itemStateChanged(  final Item item){
    if (!(item instanceof Gauge))     return;
    Gauge gauge=(Gauge)item;
    int val=gauge.getValue();
    if (item == volGauge) {
      volControl.setLevel(val);
      volGauge.setLabel("Volume: " + val);
    }
    if (item == tempoGauge && tempoControl != null) {
      tempoControl.setTempo((val) * 10 * 1000);
      tempoGauge.setLabel("Tempo: " + (val * 10));
    }
    if (item == pitchGauge && pitchControl != null) {
      pitchControl.setPitch((val - 5) * 12 * 1000);
      pitchGauge.setLabel("Pitch: " + (val - 5));
    }
  }
  public void startPlay(){
    try {
      if (midiPlayer != null) {
        midiPlayer.start();
      }
    }
 catch (    Exception e) {
      System.err.println(e);
    }
  }
  public void pausePlay(){
    try {
      if (midiPlayer != null) {
        midiPlayer.stop();
      }
    }
 catch (    Exception e) {
      System.err.println(e);
    }
  }
  protected void paint(  Graphics arg0){
  }
  protected void hook55() throws Exception {
  }
}