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/*
* Copyright 2009 Phil Burk, Mobileer Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.jsyn.examples;
import com.jsyn.JSyn;
import com.jsyn.Synthesizer;
import com.jsyn.ports.UnitOutputPort;
import com.jsyn.unitgen.Add;
import com.jsyn.unitgen.AsymptoticRamp;
import com.jsyn.unitgen.Circuit;
import com.jsyn.unitgen.LineOut;
import com.jsyn.unitgen.Pan;
import com.jsyn.unitgen.SawtoothOscillatorDPW;
import com.jsyn.unitgen.SineOscillator;
import com.jsyn.unitgen.UnitOscillator;
import com.jsyn.unitgen.UnitSource;
/**
* Make a bunch of oscillators that swarm around a moving frequency.
*
* @author Phil Burk (C) 2009 Mobileer Inc
*/
public class SwarmOfOscillators {
private Synthesizer synth;
Follower[] followers;
SineOscillator lfo;
LineOut lineOut;
private Add tiePoint;
private static final int NUM_FOLLOWERS = 30;
class Follower extends Circuit implements UnitSource {
UnitOscillator osc;
AsymptoticRamp lag;
Pan panner;
Follower() {
// Add a tone generator.
add(osc = new SawtoothOscillatorDPW());
osc.amplitude.set(0.03);
// Use a lag to smoothly change frequency.
add(lag = new AsymptoticRamp());
double hlife = 0.01 + (Math.random() * 0.9);
lag.halfLife.set(hlife);
// Set left/right pan randomly between -1.0 and +1.0.
add(panner = new Pan());
panner.pan.set((Math.random() * 2.0) - 1.0);
// Track the frequency coming through the tiePoint.
tiePoint.output.connect(lag.input);
// Add the LFO offset.
lfo.output.connect(lag.input);
lag.output.connect(osc.frequency);
// Connect the oscillator to the left and right audio output.
osc.output.connect(panner.input);
}
@Override
public UnitOutputPort getOutput() {
return panner.output;
}
}
private void test() {
synth = JSyn.createSynthesizer();
// Add an output mixer.
synth.add(lineOut = new LineOut());
// Add a unit just to distribute the control frequency.
synth.add(tiePoint = new Add());
synth.add(lfo = new SineOscillator());
lfo.amplitude.set(40.0);
lfo.frequency.set(2.3);
followers = new Follower[NUM_FOLLOWERS];
for (int i = 0; i < followers.length; i++) {
Follower follower = new Follower();
synth.add(follower);
// Every follower can connect directly to the lineOut because all input ports are
// mixers.
follower.getOutput().connect(0, lineOut.input, 0);
follower.getOutput().connect(1, lineOut.input, 1);
followers[i] = follower;
}
// 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 duration = 0.9;
double time = timeNow + duration;
double freq = 400.0; // hertz
tiePoint.inputA.set(freq, time);
// Randomly change the target frequency for the followers.
try {
for (int i = 0; i < 20; i++) {
// Schedule this to happen a bit later.
time += duration;
freq = 200.0 + (Math.random() * 500.0);
tiePoint.inputA.set(freq, time);
// Sleep while the sound is being generated in the background
// thread.
synth.sleepUntil(time - 0.2);
}
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.format("CPU usage = %4.2f%c\n", synth.getUsage() * 100, '%');
// Stop everything.
synth.stop();
}
public static void main(String[] args) {
new SwarmOfOscillators().test();
}
}
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