Java by API/javax.sound.midi/MidiChannel

MidiChannel: noteOff(int noteNumber)

   <source lang="java">
 

/*

* Copyright (c) 2004 David Flanagan.  All rights reserved.
* This code is from the book Java Examples in a Nutshell, 3nd Edition.
* It is provided AS-IS, WITHOUT ANY WARRANTY either expressed or implied.
* You may study, use, and modify it for any non-commercial purpose,
* including teaching and use in open-source projects.
* You may distribute it non-commercially as long as you retain this notice.
* For a commercial use license, or to purchase the book, 
* please visit http://www.davidflanagan.ru/javaexamples3.
*/

import java.awt.event.KeyAdapter; import java.awt.event.KeyEvent; import java.awt.event.MouseEvent; import java.awt.event.MouseMotionAdapter; import javax.sound.midi.MidiChannel; import javax.sound.midi.MidiSystem; import javax.sound.midi.MidiUnavailableException; import javax.sound.midi.Synthesizer; import javax.swing.JFrame; /**

* This program the MIDI percussion channel with a Swing window. It monitors
* keystrokes and mouse motion in the window and uses them to create music.
* Keycodes between 35 and 81, inclusive, generate different percussive sounds.
* See the VK_ constants in java.awt.event.KeyEvent, or just experiment. Mouse
* position controls volume: move the mouse to the right of the window to
* increase the volume.
*/

public class Main extends JFrame {

 MidiChannel channel; // The channel we play on: 10 is for percussion
 int velocity = 64; // Default volume is 50%
 public static void main(String[] args) throws MidiUnavailableException {
   // We don"t need a Sequencer in this example, since we send MIDI
   // events directly to the Synthesizer instead.
   Synthesizer synthesizer = MidiSystem.getSynthesizer();
   synthesizer.open();
   JFrame frame = new Main(synthesizer);
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   frame.setSize(50, 128); // We use window width as volume control
   frame.setVisible(true);
 }
 public Main(Synthesizer synth) {
   super("Drums");
   // Channel 10 is the GeneralMidi percussion channel. In Java code, we
   // number channels from 0 and use channel 9 instead.
   channel = synth.getChannels()[9];
   addKeyListener(new KeyAdapter() {
     public void keyPressed(KeyEvent e) {
       int key = e.getKeyCode();
       if (key >= 35 && key <= 81) {
         channel.noteOn(key, velocity);
       }
     }
     public void keyReleased(KeyEvent e) {
       int key = e.getKeyCode();
       if (key >= 35 && key <= 81)
         channel.noteOff(key);
     }
   });
   addMouseMotionListener(new MouseMotionAdapter() {
     public void mouseMoved(MouseEvent e) {
       velocity = e.getX();
     }
   });
 }

}

 </source>
   
  
 
  

MidiChannel: noteOn(int noteNumber, int velocity)

   <source lang="java">
 

/*

* Copyright (c) 2004 David Flanagan.  All rights reserved.
* This code is from the book Java Examples in a Nutshell, 3nd Edition.
* It is provided AS-IS, WITHOUT ANY WARRANTY either expressed or implied.
* You may study, use, and modify it for any non-commercial purpose,
* including teaching and use in open-source projects.
* You may distribute it non-commercially as long as you retain this notice.
* For a commercial use license, or to purchase the book, 
* please visit http://www.davidflanagan.ru/javaexamples3.
*/

import java.awt.event.KeyAdapter; import java.awt.event.KeyEvent; import java.awt.event.MouseEvent; import java.awt.event.MouseMotionAdapter; import javax.sound.midi.MidiChannel; import javax.sound.midi.MidiSystem; import javax.sound.midi.MidiUnavailableException; import javax.sound.midi.Synthesizer; import javax.swing.JFrame; /**

* This program the MIDI percussion channel with a Swing window. It monitors
* keystrokes and mouse motion in the window and uses them to create music.
* Keycodes between 35 and 81, inclusive, generate different percussive sounds.
* See the VK_ constants in java.awt.event.KeyEvent, or just experiment. Mouse
* position controls volume: move the mouse to the right of the window to
* increase the volume.
*/

public class Main extends JFrame {

 MidiChannel channel; // The channel we play on: 10 is for percussion
 int velocity = 64; // Default volume is 50%
 public static void main(String[] args) throws MidiUnavailableException {
   // We don"t need a Sequencer in this example, since we send MIDI
   // events directly to the Synthesizer instead.
   Synthesizer synthesizer = MidiSystem.getSynthesizer();
   synthesizer.open();
   JFrame frame = new Main(synthesizer);
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   frame.setSize(50, 128); // We use window width as volume control
   frame.setVisible(true);
 }
 public Main(Synthesizer synth) {
   super("Drums");
   // Channel 10 is the GeneralMidi percussion channel. In Java code, we
   // number channels from 0 and use channel 9 instead.
   channel = synth.getChannels()[9];
   addKeyListener(new KeyAdapter() {
     public void keyPressed(KeyEvent e) {
       int key = e.getKeyCode();
       if (key >= 35 && key <= 81) {
         channel.noteOn(key, velocity);
       }
     }
     public void keyReleased(KeyEvent e) {
       int key = e.getKeyCode();
       if (key >= 35 && key <= 81)
         channel.noteOff(key);
     }
   });
   addMouseMotionListener(new MouseMotionAdapter() {
     public void mouseMoved(MouseEvent e) {
       velocity = e.getX();
     }
   });
 }

}

 </source>