Examples of javax.sound.midi.Synthesizer

javax.sound.midi.Synthesizer
A Synthesizer generates sound. This usually happens when one of the Synthesizer's {@link MidiChannel} objects receives a{@link MidiChannel#noteOn(int,int) noteOn} message, eitherdirectly or via the Synthesizer object. Many Synthesizers support Receivers, through which MIDI events can be delivered to the Synthesizer. In such cases, the Synthesizer typically responds by sending a corresponding message to the appropriate MidiChannel, or by processing the event itself if the event isn't one of the MIDI channel messages.
The Synthesizer interface includes methods for loading and unloading instruments from soundbanks. An instrument is a specification for synthesizing a certain type of sound, whether that sound emulates a traditional instrument or is some kind of sound effect or other imaginary sound. A soundbank is a collection of instruments, organized by bank and program number (via the instrument's Patch object). Different Synthesizer classes might implement different sound-synthesis techniques, meaning that some instruments and not others might be compatible with a given synthesizer. Also, synthesizers may have a limited amount of memory for instruments, meaning that not every soundbank and instrument can be used by every synthesizer, even if the synthesis technique is compatible. To see whether the instruments from a certain soundbank can be played by a given synthesizer, invoke the {@link #isSoundbankSupported(Soundbank) isSoundbankSupported} method ofSynthesizer.
"Loading" an instrument means that that instrument becomes available for synthesizing notes. The instrument is loaded into the bank and program location specified by its Patch object. Loading does not necessarily mean that subsequently played notes will immediately have the sound of this newly loaded instrument. For the instrument to play notes, one of the synthesizer's MidiChannel objects must receive (or have received) a program-change message that causes that particular instrument's bank and program number to be selected. @see MidiSystem#getSynthesizer @see Soundbank @see Instrument @see MidiChannel#programChange(int,int) @see Receiver @see Transmitter @see MidiDevice @author Kara Kytle


public class Main {


  public static void main(String[] args) throws MidiUnavailableException, InterruptedException {


    Synthesizer synth = MidiSystem.getSynthesizer();
    synth.open();


    MidiChannel[] channels = synth.getChannels();
    MidiChannel channel = channels[0];


    Instrument[] instr = synth.getDefaultSoundbank().getInstruments();
    synth.loadInstrument(instr[0]);


    Piano piano = new Piano(3, -1, channel);


    PianoFrame frame = new PianoFrame(piano);
    frame.setVisible(true);

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        ret.init();
        return ret;
    }


    public static String[] getInstruments() {
        Synthesizer synthesizer = null;
        try {
            synthesizer = MidiSystem.getSynthesizer();
            synthesizer.open();
            synthesizer.loadAllInstruments(synthesizer.getDefaultSoundbank());
        } catch (MidiUnavailableException ex) {
            ex.printStackTrace();
        }
        Instrument in[] = synthesizer.getLoadedInstruments();
        String ret[] = new String[in.length];
        for (int x = 0; x < in.length; x++) {
            ret[x] = in[x].getName();
        }
        return ret;

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    }


    public void init() {
        try {
            // events directly to the Synthesizer instead.
            Synthesizer synthesizer = MidiSystem.getSynthesizer();
            synthesizer.open();


            synthesizer.loadAllInstruments(synthesizer.getDefaultSoundbank());
            Instrument in[] = synthesizer.getLoadedInstruments();


            synthesizer.loadInstrument(in[70]);
            channel = synthesizer.getChannels()[0];
        } catch (MidiUnavailableException ex) {
            ex.printStackTrace();
        }
    }

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    /*
     * Find available AudioSynthesizer.
     */
    public static AudioSynthesizer findAudioSynthesizer() throws MidiUnavailableException, IOException, InvalidMidiDataException {
        // First check if default synthesizer is AudioSynthesizer.
        Synthesizer synth = MidiSystem.getSynthesizer();
        if (synth instanceof AudioSynthesizer) {
            return (AudioSynthesizer) synth;
        }


        // If default synhtesizer is not AudioSynthesizer, check others.

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            try {
                synth.play(null);
            } catch (Exception ex){};
            Field synthField = ReflectionUtils.findField(MidiSynth.class, "m_synth");
            ReflectionUtils.makeAccessible(synthField);
            Synthesizer synthsizer = (Synthesizer) synthField.get(synth);
            loadSoundbankInstruments(synthsizer);
        } catch (Exception ex) {
            throw new IllegalStateException(ex);
        }

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  public static void main(String[] args) throws Exception {
        Field f = SoftSynthesizer.class.getDeclaredField("testline");
        f.setAccessible(true);
        f.set(null, new DummySourceDataLine());
        
    Synthesizer synth = new SoftSynthesizer();
        
    ReferenceCountingDevice rcd = (ReferenceCountingDevice)synth;    
          
    // Test single open/close cycle
    
    Receiver recv = rcd.getReceiverReferenceCounting();
    if(!synth.isOpen())
      throw new Exception("Synthesizer not open!");
    recv.close();
    if(synth.isOpen())
      throw new Exception("Synthesizer not closed!");


    // Test using 2 receiver cycle
    
    Receiver recv1 = rcd.getReceiverReferenceCounting();
    if(!synth.isOpen())
      throw new Exception("Synthesizer not open!");    
    Receiver recv2 = rcd.getReceiverReferenceCounting();
    if(!synth.isOpen())
      throw new Exception("Synthesizer not open!");


    recv2.close();
    if(!synth.isOpen())
      throw new Exception("Synthesizer was closed!");
    recv1.close();
    if(synth.isOpen())
      throw new Exception("Synthesizer not closed!");
    
    // Test for explicit,implicit conflict 
    
    synth.open();
    Receiver recv3 = rcd.getReceiverReferenceCounting();
    if(!synth.isOpen())
      throw new Exception("Synthesizer not open!");
    recv3.close();
    if(!synth.isOpen())
      throw new Exception("Synthesizer was closed!");
    synth.close();
    if(synth.isOpen())
      throw new Exception("Synthesizer not closed!");


    // Test for implicit,explicit conflict 
    
    recv3 = rcd.getReceiverReferenceCounting();
    synth.open();
    if(!synth.isOpen())
      throw new Exception("Synthesizer not open!");
    recv3.close();
    if(!synth.isOpen())
      throw new Exception("Synthesizer was closed!");
    synth.close();
    if(synth.isOpen())
      throw new Exception("Synthesizer not closed!");
    
  }

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