javax.sound play midi

[Dennis]

I want to make a javax.sound applet/application.

But now I can only open and play an audio (.au) file.
now I want to open and play a .mid file.

I've read it's possible to do that with a sequence(r), but I don't know how I need to use it.

Does someone have a simple example for open and play a .mid file?

Thanks,
Dennis

[Eranga]

Yeas that's the way, Sequence will done the job. Open the stream before start it.

            Sequencer sequencer = MidiSystem.getSequencer();
            sequencer.setSequence(MidiSystem.getSequence(midi_file));
            sequencer.open();
            sequencer.start();

[Eranga]

Use it within a separate thread if you can.

[Dennis]

When I do that I get an error. (my IDE is "EclipseSDK")

This is my source-code:

import java.io.File;
import java.io.IOException;
import javax.sound.midi.InvalidMidiDataException;
import javax.sound.midi.MidiSystem;
import javax.sound.midi.MidiUnavailableException;
import javax.sound.midi.Sequencer;


public class sound3 extends java.applet.Applet
{
	private static final long serialVersionUID = 1L;

	public sound3()
	{
		Thread soundThread = new Thread(soundRun);
		soundThread.start();
	}
	
	Runnable soundRun = new Runnable(){
			public void run()
			{
				try{
					Sequencer sequencer = MidiSystem.getSequencer();
					sequencer.setSequence(MidiSystem.getSequence(new File("TLSTN.MID")));
					sequencer.open();
					sequencer.start();
				}catch(InvalidMidiDataException ex){
					ex.printStackTrace();
				}catch(IOException ex){
					ex.printStackTrace();
				}catch(MidiUnavailableException ex){
					ex.printStackTrace();
				}
			}
	};
}

And this is the error that I recieve:

javax.sound.midi.InvalidMidiDataException: could not get sequence from file
	at javax.sound.midi.MidiSystem.getSequence(MidiSystem.java:854)
	at sound3$1.run(sound3.java:23)
	at java.lang.Thread.run(Thread.java:619)

[Dennis]

I think it's already solved, my .mid file isn't a good MIDI file.
when I tried it with a .mid file from internet it's working.

Thanks! ;)

[Eranga]

File formats can be corrupted easily.

[Eranga]

Regarding your question. It's better to validate with a endless loop. It's much easier way to work on. Something like this.

while(true) {
                if(sequencer.isRunning()) {
                    try {
                        Thread.sleep(1000);
                    } 
                     catch(Exception ex) {
                        // Relevant process
                    }
                }
            }