Java Tutorial/J2ME/MIDI

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Controllable MIDI

   <source lang="java">

import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Form; import javax.microedition.lcdui.Gauge; 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 javax.microedition.midlet.MIDlet; public class ControllableMIDIMIDlet extends MIDlet implements ItemStateListener { 

 Player midiPlayer = null;
 VolumeControl volControl = null;
 PitchControl pitchControl = null;
 TempoControl tempoControl = null;
 Form form = new Form("MIDI Player", null);
 Gauge volGauge = new Gauge("Volume: 50", true, 100, 50);
 Gauge pitchGauge = new Gauge("Pitch: 0", true, 10, 5);
 Gauge tempoGauge = new Gauge("Tempo: 120", true, 30, 12);
 public ControllableMIDIMIDlet() {
   try {
     midiPlayer = Manager.createPlayer(getClass().getResourceAsStream("/a.mid"), "audio/midi");
     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.append(volGauge);
     form.append(tempoGauge);
     form.append(pitchGauge);
     form.setItemStateListener(this);
     Display.getDisplay(this).setCurrent(form);
   } catch (Exception e) {
     System.err.println(e);
   }
 }
 public void itemStateChanged(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 startApp() {
   try {
     if (midiPlayer != null) {
       midiPlayer.start();
     }
   } catch (Exception e) {
     System.err.println(e);
   }
 }
 public void pauseApp() {
   try {
     if (midiPlayer != null) {
       midiPlayer.stop();
     }
   } catch (Exception e) {
     System.err.println(e);
   }
 }
 public void destroyApp(boolean unconditional) {
   try {
     if (midiPlayer != null) {
       midiPlayer.close();
     }
   } catch (Exception e) {
     System.err.println(e);
   }
 }

}</source>





MIDI Capabilities

   <source lang="java">

import javax.microedition.lcdui.Alert; import javax.microedition.lcdui.AlertType; import javax.microedition.lcdui.Display; import javax.microedition.media.Manager; import javax.microedition.media.Player; import javax.microedition.media.control.MIDIControl; import javax.microedition.midlet.MIDlet; public class MIDICapabilitiesMIDlet extends MIDlet { 

 public void startApp() {
   try {
     Player p = Manager.createPlayer(Manager.MIDI_DEVICE_LOCATOR);
     p.prefetch();
     MIDIControl mControl = (MIDIControl) p
         .getControl("javax.microedition.media.control.MIDIControl");
     String msg = mControl.isBankQuerySupported() ? "MIDIControl is fully supported"
         : "Minimum MIDIControl is provided";
     Display.getDisplay(this).setCurrent(new Alert("Message", msg, null, AlertType.INFO));
   } catch (Exception e) {
     System.err.println(e);
   }
 }
 public void pauseApp() {
 }
 public void destroyApp(boolean unconditional) {
 }

}</source>





MIDI Events

   <source lang="java">

import javax.microedition.lcdui.Alert; import javax.microedition.lcdui.Display; import javax.microedition.media.Manager; import javax.microedition.media.Player; import javax.microedition.media.control.MIDIControl; import javax.microedition.midlet.MIDlet; public class MIDIEventsMIDlet extends MIDlet { 

 Display display = null;
 Alert alert = new Alert("Message");
 public MIDIEventsMIDlet() {
   display = Display.getDisplay(this);
   alert.setString("Working...");
   alert.setTimeout(Alert.FOREVER);
 }
 public void startApp() {
   display.setCurrent(alert);
   try {
     Player p = Manager.createPlayer(Manager.MIDI_DEVICE_LOCATOR);
     p.prefetch();
     MIDIControl mControl = (MIDIControl) p
         .getControl("javax.microedition.media.control.MIDIControl");
     if (mControl == null)
       throw new Exception("MIDIControl not available");
     mControl.shortMidiEvent(MIDIControl.NOTE_ON | 11, 60, 100);
     Thread.sleep(100);
     mControl.shortMidiEvent(192 | 11, 14, 0);
     Thread.sleep(100);
     mControl.shortMidiEvent(MIDIControl.CONTROL_CHANGE | 11, 7, 50);
     Thread.sleep(100);
     mControl.shortMidiEvent(MIDIControl.NOTE_ON | 11, 60, 0);
   } catch (Exception e) {
     alert.setString(e.getMessage());
   }
 }
 public void pauseApp() {
 }
 public void destroyApp(boolean unconditional) {
 }

}</source>





Mixing Audio

   <source lang="java">

import javax.microedition.lcdui.Alert; import javax.microedition.lcdui.rumand; import javax.microedition.lcdui.rumandListener; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.media.Manager; import javax.microedition.media.Player; import javax.microedition.media.control.MIDIControl; import javax.microedition.midlet.MIDlet; public class MixingAudioMIDlet extends MIDlet implements CommandListener { 

 private Player backgroundPlayer = null;
 private Player firePlayer = null;
 private Player jumpPlayer = null;
 private MIDIControl mControl = null;
 private Display display = null;
 private Alert alert = new Alert("Message");
 private Command exitCommand = new Command("Exit", Command.EXIT, 1);
 private Command fireCommand = new Command("Fire!", Command.SCREEN, 1);
 private Command jumpCommand = new Command("Jump!", Command.SCREEN, 1);
 public MixingAudioMIDlet() {
   display = Display.getDisplay(this);
   alert.setString("Playing background score");
   alert.setTimeout(Alert.FOREVER);
   alert.addCommand(exitCommand);
   alert.addCommand(fireCommand);
   alert.addCommand(jumpCommand);
   alert.setCommandListener(this);
   initPlayers();
 }
 private void initPlayers() {
   try {
     backgroundPlayer = Manager.createPlayer(getClass().getResourceAsStream("/a.mid"),
         "audio/midi");
     backgroundPlayer.prefetch();
     backgroundPlayer.setLoopCount(-1);
     firePlayer = Manager.createPlayer(Manager.MIDI_DEVICE_LOCATOR);
     firePlayer.prefetch();
     mControl = (MIDIControl) firePlayer
         .getControl("javax.microedition.media.control.MIDIControl");
     mControl.setProgram(11, -1, 127);
     jumpPlayer = Manager.createPlayer(getClass().getResourceAsStream(
         "/p.wav"), "audio/x-wav");
     jumpPlayer.prefetch();
   } catch (Exception e) {
     e.printStackTrace();
   }
 }
 public void startApp() {
   try {
     if (backgroundPlayer != null) {
       backgroundPlayer.start();
     }
   } catch (Exception e) {
     e.printStackTrace();
   }
   display.setCurrent(alert);
 }
 public void commandAction(Command cmd, Displayable disp) {
   if (cmd == exitCommand) {
     destroyApp(true);
     notifyDestroyed();
     return;
   }
   try {
     if (cmd == fireCommand) {
       mControl.shortMidiEvent(MIDIControl.NOTE_ON | 11, 60, 100);
     }
     if (cmd == jumpCommand) {
       jumpPlayer.start();
     }
   } catch (Exception e) {
     e.printStackTrace();
   }
 }
 public void pauseApp() {
   try {
     if (backgroundPlayer != null)
       backgroundPlayer.stop();
     if (firePlayer != null)
       firePlayer.stop();
     if (jumpPlayer != null)
       jumpPlayer.stop();
   } catch (Exception e) {
     e.printStackTrace();
   }
 }
 public void destroyApp(boolean unconditional) {
   try {
     if (backgroundPlayer != null) {
       backgroundPlayer.close();
       backgroundPlayer = null;
     }
     if (firePlayer != null) {
       firePlayer.close();
       firePlayer = null;
     }
     if (jumpPlayer != null) {
       jumpPlayer.close();
       jumpPlayer = null;
     }
   } catch (Exception e) {
     e.printStackTrace();
   }
 }

}</source>





Play MIDI

   <source lang="java">

import javax.microedition.media.Manager; import javax.microedition.media.Player; import javax.microedition.midlet.MIDlet; public class PlayMIDIMIDlet extends MIDlet { 

 Player midiPlayer = null;
 public PlayMIDIMIDlet() {
   try {
     midiPlayer = Manager.createPlayer(getClass().getResourceAsStream("/a.mid"), "audio/midi");
   } catch (Exception e) {
     System.err.println(e);
   }
 }
 public void startApp() {
   try {
     if (midiPlayer != null) {
       midiPlayer.start();
     }
   } catch (Exception e) {
     System.err.println(e);
   }
 }
 public void pauseApp() {
 }
 public void destroyApp(boolean unconditional) {
 }

}</source>


Источник — «http://jexp.ru/index.php?title=Java_Tutorial/J2ME/MIDI&oldid=4136»