Examples of javax.sound.midi.MidiChannel

javax.sound.midi.MidiChannel
idi.org> http://www.midi.org).
MIDI was originally a protocol for reporting the gestures of a keyboard musician. This genesis is visible in the MidiChannel API, which preserves such MIDI concepts as key number, key velocity, and key pressure. It should be understood that the MIDI data does not necessarily originate with a keyboard player (the source could be a different kind of musician, or software). Some devices might generate constant values for velocity and pressure, regardless of how the note was performed. Also, the MIDI specification often leaves it up to the synthesizer to use the data in the way the implementor sees fit. For example, velocity data need not always be mapped to volume and/or brightness. @see Synthesizer#getChannels @author David Rivas @author Kara Kytle




    public void open() {
        model.open();


        MidiChannel midiChannels[] = model.getMidiChannels();
        channels = new ChannelData[midiChannels.length];
        for (int i = 0; i < channels.length; i++) {
            channels[i] = new ChannelData(midiChannels[i], i);
        }
        cc = channels[0];

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        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

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        // 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

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