NoteOverFlowTest.java

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/* @test
   @summary Test SoftChannel noteOn/noteOff overflow test */

import javax.sound.midi.MidiChannel;
import javax.sound.midi.VoiceStatus;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;

import com.sun.media.sound.AudioSynthesizer;
import com.sun.media.sound.SoftSynthesizer;

public class NoteOverFlowTest {

    public static void main(String[] args) throws Exception
    {
        AudioSynthesizer synth = new SoftSynthesizer();
        AudioFormat format = new AudioFormat(44100, 16, 2, true, false);
        AudioInputStream stream = synth.openStream(format, null);

        // Make all voices busy, e.g.
        // send midi on and midi off on all available voices
        MidiChannel ch1 = synth.getChannels()[0];
        ch1.programChange(48); // Use contionus instrument like string ensemble
        for (int i = 0; i < synth.getMaxPolyphony(); i++) {
            ch1.noteOn(64, 64);
            ch1.noteOff(64);
        }

        // Now send single midi on, and midi off message
        ch1.noteOn(64, 64);
        ch1.noteOff(64);

        // Read 10 sec from stream, by this time all voices should be inactvie
        stream.skip(format.getFrameSize() * ((int)(format.getFrameRate() * 20)));

        // If no voice are active, then this test will pass
        VoiceStatus[] v = synth.getVoiceStatus();
        for (int i = 0; i < v.length; i++) {
            if(v[i].active)
            {
                throw new RuntimeException("Not all voices are inactive!");
            }
        }

        // Close the synthesizer after use
        synth.close();
    }
}