PlaySequence.java

package com.jsyn.examples;

import com.jsyn.JSyn;
import com.jsyn.Synthesizer;
import com.jsyn.unitgen.LineOut;
import com.jsyn.unitgen.SawtoothOscillatorBL;
import com.jsyn.unitgen.UnitOscillator;

/**
 * Use time stamps to change the frequency of an oscillator at precise times.
 * 
 * @author Phil Burk (C) 2009 Mobileer Inc
 * 
 */
public class PlaySequence
{
	Synthesizer synth;
	UnitOscillator osc;
	LineOut lineOut;

	private void test()
	{
		// Create a context for the synthesizer.
		synth = JSyn.createSynthesizer();
		
		// Add a tone generator.
		synth.add( osc = new SawtoothOscillatorBL() );
		// Add an output mixer.
		synth.add( lineOut = new LineOut() );
		
		// Connect the oscillator to the left and right audio output.
		osc.output.connect( 0, lineOut.input, 0 );
		osc.output.connect( 0, lineOut.input, 1 );
		
		// Start synthesizer using default stereo output at 44100 Hz.
		synth.start();
		// We only need to start the LineOut. It will pull data from the
		// oscillator.
		lineOut.start();

		// Get synthesizer time in seconds.
		double timeNow = synth.getCurrentTime();

		// Advance to a near future time so we have a clean start.
		double time = timeNow + 0.5;
		double freq = 400.0; // hertz
		osc.frequency.set( freq, time );

		// Schedule this to happen a bit later.
		time += 0.5;
		freq *= 1.5; // up a perfect fifth
		osc.frequency.set( freq, time );

		time += 0.5;
		freq *= 4.0 / 5.0; // down a major third
		osc.frequency.set( freq, time );

		// Sleep while the sound is being generated in the background thread.
		try
		{
			synth.sleepUntil( time + 0.5 );
		} catch( InterruptedException e )
		{
			e.printStackTrace();
		}

		// Stop everything.
		synth.stop();
	}

	public static void main( String[] args )
	{
		new PlaySequence().test();
	}
}