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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.
+ */
+/**
+ * If you play notes fast enough they become a tone.
+ * 
+ * Play a sine wave modulated by an envelope.
+ * Speed up the envelope until it is playing at audio rate.
+ * Slow down the oscillator until it becomes an LFO amp modulator.
+ * Use a LatchZeroCrossing to stop at the end of a sine wave cycle when we are finished.
+ *
+ * @author Phil Burk, (C) 2010 Mobileer Inc
+ */
+
+package com.jsyn.examples;
+
+import java.io.File;
+import java.io.IOException;
+
+import com.jsyn.JSyn;
+import com.jsyn.Synthesizer;
+import com.jsyn.data.SegmentedEnvelope;
+import com.jsyn.unitgen.ExponentialRamp;
+import com.jsyn.unitgen.LatchZeroCrossing;
+import com.jsyn.unitgen.LineOut;
+import com.jsyn.unitgen.SineOscillator;
+import com.jsyn.unitgen.UnitOscillator;
+import com.jsyn.unitgen.VariableRateDataReader;
+import com.jsyn.unitgen.VariableRateMonoReader;
+import com.jsyn.util.WaveRecorder;
+
+/**
+ * When notes speed up they can become a new tone. <br>
+ * Multiply an oscillator and an envelope. Speed up the envelope until it becomes a tone. Slow down
+ * the oscillator until it acts like an envelope. Write the resulting audio to a WAV file.
+ * 
+ * @author Phil Burk (C) 2011 Mobileer Inc
+ */
+
+public class NotesToTone {
+    private final static double SONG_AMPLITUDE = 0.7;
+    private final static double INTRO_DURATION = 2.0;
+    private final static double OUTRO_DURATION = 2.0;
+    private final static double RAMP_DURATION = 20.0;
+    private final static double LOW_FREQUENCY = 1.0;
+    private final static double HIGH_FREQUENCY = 800.0;
+
+    private final static boolean useRecorder = true;
+    private WaveRecorder recorder;
+
+    private Synthesizer synth;
+    private ExponentialRamp envSweeper;
+    private ExponentialRamp oscSweeper;
+    private VariableRateDataReader envelopePlayer;
+    private UnitOscillator osc;
+    private LatchZeroCrossing latch;
+    private LineOut lineOut;
+    private SegmentedEnvelope envelope;
+
+    private void play() throws IOException {
+        synth = JSyn.createSynthesizer();
+        synth.setRealTime(true);
+
+        if (useRecorder) {
+            File waveFile = new File("notes_to_tone.wav");
+            // Default is stereo, 16 bits.
+            recorder = new WaveRecorder(synth, waveFile, 1);
+            System.out.println("Writing to WAV file " + waveFile.getAbsolutePath());
+        }
+
+        createUnits();
+
+        connectUnits();
+
+        setupEnvelope();
+
+        osc.amplitude.set(SONG_AMPLITUDE);
+
+        // Ramp the rate of the envelope up until it becomes an audible tone.
+        envSweeper.current.set(LOW_FREQUENCY);
+        envSweeper.input.set(LOW_FREQUENCY);
+        envSweeper.time.set(RAMP_DURATION);
+
+        // Ramp the rate of the oscillator down until it becomes an LFO.
+        oscSweeper.current.set(HIGH_FREQUENCY);
+        oscSweeper.input.set(HIGH_FREQUENCY);
+        oscSweeper.time.set(RAMP_DURATION);
+
+        // Start synthesizer using default stereo output at 44100 Hz.
+        synth.start();
+
+        // When we start the recorder it will pull data from the oscillator and
+        // sweeper.
+        if (recorder != null) {
+            recorder.start();
+        }
+
+        // We also need to start the LineOut if we want to hear it now.
+        lineOut.start();
+
+        // Get synthesizer time in seconds.
+        double timeNow = synth.getCurrentTime();
+
+        // Schedule start of ramps.
+        double songDuration = INTRO_DURATION + RAMP_DURATION + OUTRO_DURATION;
+        envSweeper.input.set(HIGH_FREQUENCY, timeNow + INTRO_DURATION);
+        oscSweeper.input.set(LOW_FREQUENCY, timeNow + INTRO_DURATION);
+
+        // Arm zero crossing latch
+        latch.gate.set(0.0, timeNow + songDuration);
+
+        // Sleep while the sound is being generated in the background thread.
+        try {
+            synth.sleepUntil(timeNow + songDuration + 2.0);
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+
+        if (recorder != null) {
+            recorder.stop();
+            recorder.close();
+        }
+        // Stop everything.
+        synth.stop();
+    }
+
+    private void createUnits() {
+        // Add a tone generators.
+        synth.add(osc = new SineOscillator());
+        // Add a controller that will sweep the envelope rate up.
+        synth.add(envSweeper = new ExponentialRamp());
+        // Add a controller that will sweep the oscillator down.
+        synth.add(oscSweeper = new ExponentialRamp());
+
+        synth.add(latch = new LatchZeroCrossing());
+        // Add an output unit.
+        synth.add(lineOut = new LineOut());
+
+        // Add an envelope player.
+        synth.add(envelopePlayer = new VariableRateMonoReader());
+    }
+
+    private void connectUnits() {
+        oscSweeper.output.connect(osc.frequency);
+        osc.output.connect(latch.input);
+        // Latch when sine LFO crosses zero.
+        latch.output.connect(envelopePlayer.amplitude);
+
+        envSweeper.output.connect(envelopePlayer.rate);
+
+        // Connect the envelope player to the audio output.
+        envelopePlayer.output.connect(0, lineOut.input, 0);
+        // crossFade.output.connect( 0, lineOut.input, 1 );
+
+        if (recorder != null) {
+            envelopePlayer.output.connect(0, recorder.getInput(), 0);
+            // crossFade.output.connect( 0, recorder.getInput(), 1 );
+        }
+    }
+
+    private void setupEnvelope() {
+        // Setup envelope. The envelope has a total duration of 1.0 seconds.
+        // Values are (duration,target) pairs.
+        double[] pairs = new double[5 * 2 * 2];
+        int i = 0;
+        // duration, target for delay
+        pairs[i++] = 0.15;
+        pairs[i++] = 0.0;
+        // duration, target for attack
+        pairs[i++] = 0.05;
+        pairs[i++] = 1.0;
+        // duration, target for release
+        pairs[i++] = 0.1;
+        pairs[i++] = 0.6;
+        // duration, target for sustain
+        pairs[i++] = 0.1;
+        pairs[i++] = 0.6;
+        // duration, target for release
+        pairs[i++] = 0.1;
+        pairs[i++] = 0.0;
+        // Create mirror image of this envelope.
+        int halfLength = i;
+        while (i < pairs.length) {
+            pairs[i] = pairs[i - halfLength];
+            i++;
+            pairs[i] = pairs[i - halfLength] * -1.0;
+            i++;
+        }
+        envelope = new SegmentedEnvelope(pairs);
+
+        envelopePlayer.dataQueue.queueLoop(envelope, 0, envelope.getNumFrames());
+    }
+
+    public static void main(String[] args) {
+        try {
+            new NotesToTone().play();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+}