Java Tutorial/Development/MIDI Sound

Determine the duration of a Midi audio file

   <source lang="java">

import java.io.File; import java.net.URL; import javax.sound.midi.MidiSystem; import javax.sound.midi.Sequence; import javax.sound.midi.Sequencer; public class Main {

 public static void main(String[] argv) throws Exception {
   Sequence sequence = MidiSystem.getSequence(new File("midiaudiofile"));
   sequence = MidiSystem.getSequence(new URL("http://hostname/midiaudiofile"));
   // Create a sequencer for the sequence
   Sequencer sequencer = MidiSystem.getSequencer();
   sequencer.open();
   sequencer.setSequence(sequence);
   double durationInSecs = sequencer.getMicrosecondLength() / 1000000.0;
 }

}</source>

Determining the File Format of a Midi Audio File

   <source lang="java">

import java.io.File; import java.net.URL; import javax.sound.midi.MidiFileFormat; import javax.sound.midi.MidiSystem; public class Main {

 public static void main(String[] argv) throws Exception {
   // From file
   MidiFileFormat fformat = MidiSystem.getMidiFileFormat(new File("midifile"));
   // From URL
//   fformat = MidiSystem.getMidiFileFormat(new URL("http://hostname/midifile"));
   // Get file format
   switch (fformat.getType()) {
   case 0:
     // mid
     break;
   case 1:
     // rmf
     break;
   }
 }

}</source>

Determining When a Midi Audio Player Has Finished Playing

   <source lang="java">

import javax.sound.midi.MetaEventListener; import javax.sound.midi.MetaMessage; import javax.sound.midi.MidiSystem; import javax.sound.midi.Sequencer; public class Main {

 public static void main(String[] argv) throws Exception {
   Sequencer sequencer = MidiSystem.getSequencer();
   sequencer.open();
   sequencer.addMetaEventListener(new MetaEventListener() {
     public void meta(MetaMessage event) {
       if (event.getType() == 47) {
         // Sequencer is done playing
       }
     }
   });
 }

}</source>

Load and play Midi audio

   <source lang="java">

import java.io.File; import javax.sound.midi.MidiSystem; import javax.sound.midi.Sequence; import javax.sound.midi.Sequencer; public class Main {

 public static void main(String[] argv) throws Exception {
   // From file
   Sequence sequence = MidiSystem.getSequence(new File("midiaudiofile"));
   // From URL
   // sequence = MidiSystem.getSequence(new
   // URL("http://hostname/midiaudiofile"));
   // Create a sequencer for the sequence
   Sequencer sequencer = MidiSystem.getSequencer();
   sequencer.open();
   sequencer.setSequence(sequence);
   // Start playing
   sequencer.start();
 }

}</source>

Loading and Playing Midi Audio

   <source lang="java">

import java.io.File; import java.net.URL; import javax.sound.midi.MidiSystem; import javax.sound.midi.Sequence; import javax.sound.midi.Sequencer; public class Main {

 public static void main(String[] argv) throws Exception {
   Sequence sequence = MidiSystem.getSequence(new File("midifile"));
   // From URL
   sequence = MidiSystem.getSequence(new URL("http://hostname/midifile"));
   // Create a sequencer for the sequence
   Sequencer sequencer = MidiSystem.getSequencer();
   sequencer.open();
   sequencer.setSequence(sequence);
   // Start playing
   sequencer.start();
 }

}</source>

Play a streaming Midi audio

   <source lang="java">

import java.io.BufferedInputStream; import java.io.File; import java.io.FileInputStream; import java.io.InputStream; import java.net.URL; import javax.sound.midi.MidiSystem; import javax.sound.midi.Sequencer; public class Main {

 public static void main(String[] argv) throws Exception {
   Sequencer sequencer = MidiSystem.getSequencer();
   sequencer.open();
   // From file
   InputStream input = new BufferedInputStream(new FileInputStream(new File("midiaudiofile")));
   // From URL
   input = new BufferedInputStream(new URL("http://hostname/rmffile").openStream());
   sequencer.setSequence(input);
   // Start playing
   sequencer.start();
 }

}</source>

Playing Streaming Midi Audio

   <source lang="java">

import java.io.BufferedInputStream; import java.io.File; import java.io.FileInputStream; import java.io.InputStream; import java.net.URL; import javax.sound.midi.MidiSystem; import javax.sound.midi.Sequencer; public class Main {

 public static void main(String[] argv) throws Exception {
   Sequencer sequencer = MidiSystem.getSequencer();
   sequencer.open();
   // From file
   InputStream is = new BufferedInputStream(new FileInputStream(new File(
       "midifile")));
   // From URL

// is = new BufferedInputStream(new URL("http://hostname/rmffile")

 //      .openStream());
   sequencer.setSequence(is);
   // Start playing
   sequencer.start();
 }

}</source>

Setting the Volume of Playing Midi Audio

   <source lang="java">

import javax.sound.midi.MidiChannel; import javax.sound.midi.MidiSystem; import javax.sound.midi.Sequencer; import javax.sound.midi.Synthesizer; public class Main {

 public static void main(String[] argv) throws Exception {
   Sequencer sequencer = MidiSystem.getSequencer();
   sequencer.open();
   if (sequencer instanceof Synthesizer) {
     Synthesizer synthesizer = (Synthesizer) sequencer;
     MidiChannel[] channels = synthesizer.getChannels();
     // gain is a value between 0 and 1 (loudest)
     double gain = 0.9D;
     for (int i = 0; i < channels.length; i++) {
       channels[i].controlChange(7, (int) (gain * 127.0));
     }
   }
 }

}</source>