Java MidiChannel.noteOn方法代碼示例

import javax.sound.midi.MidiChannel; //導入方法依賴的package包/類
private static void playWarningSound() {
//        if (2 > 1) {
//            return;
//        }

        try {
//            int velocity = 127;    // max volume
            int velocity = 90;    // max volume
            int sound = 65;
            Synthesizer synthesizer = MidiSystem.getSynthesizer();
            synthesizer.open();
            MidiChannel channel = synthesizer.getChannels()[9];  // drums channel.
            for (int i = 0; i < 10; i++) {
                Thread.sleep(100);
                channel.noteOn(sound + i, velocity);
                Thread.sleep(100);
                channel.noteOff(sound + i);
            }
        } catch (MidiUnavailableException | InterruptedException e1) {
            e1.printStackTrace();
        }
    }
 

import javax.sound.midi.MidiChannel; //導入方法依賴的package包/類
@Override
public void render() throws RenderCommandException {
	sleepUntil(getFrame().playOutTime);

	for(MidiMessage msg : getFrame().messages) {
		if(msg instanceof ShortMessage) {
			final ShortMessage sm = (ShortMessage)msg;
			final MidiChannel  ch = synth.getChannels()[sm.getChannel()];
			switch(sm.getCommand()) {
			case ShortMessage.NOTE_ON:
				ch.noteOn(sm.getData1(), sm.getData2());
				continue;
			case ShortMessage.NOTE_OFF:
				ch.noteOff(sm.getData1(), sm.getData2());
				continue;
			case ShortMessage.PROGRAM_CHANGE:
				ch.programChange(sm.getData1());
				continue;
			case ShortMessage.CONTROL_CHANGE:
				ch.controlChange(sm.getData1(), sm.getData2());
				continue;
			}
		}
		throw new RenderCommandException("Unknown MIDI Command:" + MidiToString.toString(msg));
	}
}
 

import javax.sound.midi.MidiChannel; //導入方法依賴的package包/類
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();
}
 

import javax.sound.midi.MidiChannel; //導入方法依賴的package包/類
public static void main(String[] args) throws Exception
{
    // Create instance of the synthesizer with very low polyphony
    AudioSynthesizer synth = new SoftSynthesizer();
    AudioFormat format = new AudioFormat(44100, 16, 2, true, false);
    Map<String, Object> p = new HashMap<String, Object>();
    p.put("max polyphony", new Integer(5));
    AudioInputStream stream = synth.openStream(format, p);

    // Create instrument with too many regions (more than max polyphony)
    SF2Soundbank sf2 = new SF2Soundbank();

    SF2Sample sample = new SF2Sample(sf2);
    sample.setName("test sample");
    sample.setData(new byte[100]);
    sample.setSampleRate(44100);
    sample.setOriginalPitch(20);
    sf2.addResource(sample);

    SF2Layer layer = new SF2Layer(sf2);
    layer.setName("test layer");
    sf2.addResource(layer);

    for (int i = 0; i < 100; i++) {
        SF2LayerRegion region = new SF2LayerRegion();
        region.setSample(sample);
        layer.getRegions().add(region);
    }

    SF2Instrument ins = new SF2Instrument(sf2);
    ins.setPatch(new Patch(0,0));
    ins.setName("test instrument");
    sf2.addInstrument(ins);

    SF2InstrumentRegion insregion = new SF2InstrumentRegion();
    insregion.setLayer(layer);
    ins.getRegions().add(insregion);

    // Load the test soundbank into the synthesizer
    synth.unloadAllInstruments(synth.getDefaultSoundbank());
    synth.loadAllInstruments(sf2);

    // Send out one midi on message
    MidiChannel ch1 = synth.getChannels()[0];
    ch1.programChange(0);
    ch1.noteOn(64, 64);

    // Read 1 sec from stream
    stream.skip(format.getFrameSize() * ((int)(format.getFrameRate() * 2)));

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

import javax.sound.midi.MidiChannel; //導入方法依賴的package包/類
public void sendNoteOn(int channel, int key, int velocity){
	MidiChannel midiChannel = this.synthManager.getChannel(channel);
	if( midiChannel != null ){
		midiChannel.noteOn(key, velocity);
	}
}