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/*
* Copyright 2010 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 java.awt.BorderLayout;
import javax.swing.JApplet;
import com.jsyn.JSyn;
import com.jsyn.Synthesizer;
import com.jsyn.instruments.WaveShapingVoice;
import com.jsyn.scope.AudioScope;
import com.jsyn.swing.JAppletFrame;
import com.jsyn.unitgen.Add;
import com.jsyn.unitgen.LineOut;
import com.jsyn.util.PseudoRandom;
import com.jsyn.util.VoiceAllocator;
import com.softsynth.math.AudioMath;
import com.softsynth.shared.time.TimeStamp;
/***************************************************************
* Play notes using a WaveShapingVoice. Allocate the notes using a VoiceAllocator.
*
* @author Phil Burk (C) 2010 Mobileer Inc
*/
public class ChebyshevSong extends JApplet implements Runnable {
private static final long serialVersionUID = -7459137388629333223L;
private Synthesizer synth;
private Add mixer;
private LineOut lineOut;
private AudioScope scope;
private volatile boolean go = false;
private PseudoRandom pseudo = new PseudoRandom();
private final static int MAX_VOICES = 8;
private final static int MAX_NOTES = 5;
private VoiceAllocator allocator;
private final static int scale[] = {
0, 2, 4, 7, 9
}; // pentatonic scale
/* Can be run as either an application or as an applet. */
public static void main(String args[]) {
ChebyshevSong applet = new ChebyshevSong();
JAppletFrame frame = new JAppletFrame("ChebyshevSong", applet);
frame.setSize(640, 300);
frame.setVisible(true);
frame.test();
}
/*
* Setup synthesis.
*/
@Override
public void start() {
setLayout(new BorderLayout());
synth = JSyn.createSynthesizer();
// Use a submix so we can show it on the scope.
synth.add(mixer = new Add());
synth.add(lineOut = new LineOut());
mixer.output.connect(0, lineOut.input, 0);
mixer.output.connect(0, lineOut.input, 1);
WaveShapingVoice[] voices = new WaveShapingVoice[MAX_VOICES];
for (int i = 0; i < MAX_VOICES; i++) {
WaveShapingVoice voice = new WaveShapingVoice();
synth.add(voice);
voice.usePreset(0);
voice.getOutput().connect(mixer.inputA);
voices[i] = voice;
}
allocator = new VoiceAllocator(voices);
// Start synthesizer using default stereo output at 44100 Hz.
synth.start();
lineOut.start();
// Use a scope to show the mixed output.
scope = new AudioScope(synth);
scope.addProbe(mixer.output);
scope.setTriggerMode(AudioScope.TriggerMode.NORMAL);
scope.getView().setControlsVisible(false);
add(BorderLayout.CENTER, scope.getView());
scope.start();
/* Synchronize Java display. */
getParent().validate();
getToolkit().sync();
// start thread that plays notes
Thread thread = new Thread(this);
go = true;
thread.start();
}
@Override
public void stop() {
// tell song thread to finish
go = false;
removeAll();
synth.stop();
}
double indexToFrequency(int index) {
int octave = index / scale.length;
int temp = index % scale.length;
int pitch = scale[temp] + (12 * octave);
return AudioMath.pitchToFrequency(pitch + 16);
}
private void noteOff(double time, int noteNumber) {
allocator.noteOff(noteNumber, new TimeStamp(time));
}
private void noteOn(double time, int noteNumber) {
double frequency = indexToFrequency(noteNumber);
double amplitude = 0.1;
TimeStamp timeStamp = new TimeStamp(time);
allocator.noteOn(noteNumber, frequency, amplitude, timeStamp);
allocator.setPort(noteNumber, "Range", 0.7, synth.createTimeStamp());
}
@Override
public void run() {
// always choose a new song based on time&date
int savedSeed = (int) System.currentTimeMillis();
// calculate tempo
double duration = 0.2;
// set time ahead of any system latency
double advanceTime = 0.5;
// time for next note to start
double nextTime = synth.getCurrentTime() + advanceTime;
// note is ON for half the duration
double onTime = duration / 2;
int beatIndex = 0;
try {
do {
// on every measure, maybe repeat previous pattern
if ((beatIndex & 7) == 0) {
if ((Math.random() < (1.0 / 2.0)))
pseudo.setSeed(savedSeed);
else if ((Math.random() < (1.0 / 2.0)))
savedSeed = pseudo.getSeed();
}
// Play a bunch of random notes in the scale.
int numNotes = pseudo.choose(MAX_NOTES);
for (int i = 0; i < numNotes; i++) {
int noteNumber = pseudo.choose(30);
noteOn(nextTime, noteNumber);
noteOff(nextTime + onTime, noteNumber);
}
nextTime += duration;
beatIndex += 1;
// wake up before we need to play note to cover system latency
synth.sleepUntil(nextTime - advanceTime);
} while (go);
} catch (InterruptedException e) {
System.err.println("Song exiting. " + e);
}
}
}
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