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/*
* Copyright 2011 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.unitgen;
import com.jsyn.ports.UnitInputPort;
import com.jsyn.ports.UnitOutputPort;
import com.jsyn.util.PseudoRandom;
/**
* A unit generator that generates a cloud of sound using multiple Grains. Special thanks to my
* friend Ross Bencina for his excellent article on Granular Synthesis. Several of his ideas are
* reflected in this architecture. "Implementing Real-Time Granular Synthesis" by Ross Bencina,
* Audio Anecdotes III, 2001. <code><pre>
synth.add( sampleGrainFarm = new GrainFarm() );
grainFarm.allocate( NUM_GRAINS );
</pre><code>
*
* @author Phil Burk (C) 2011 Mobileer Inc
* @see Grain
* @see GrainSourceSine
* @see RaisedCosineEnvelope
*/
public class GrainFarm extends UnitGenerator implements UnitSource {
/** A scaler for playback rate. Nominally 1.0. */
public UnitInputPort rate;
public UnitInputPort rateRange;
public UnitInputPort amplitude;
public UnitInputPort amplitudeRange;
public UnitInputPort density;
public UnitInputPort duration;
public UnitInputPort durationRange;
public UnitOutputPort output;
PseudoRandom randomizer;
private GrainState[] states;
private double countScaler = 1.0;
private GrainScheduler scheduler = new StochasticGrainScheduler();
public GrainFarm() {
randomizer = new PseudoRandom();
addPort(rate = new UnitInputPort("Rate", 1.0));
addPort(amplitude = new UnitInputPort("Amplitude", 1.0));
addPort(duration = new UnitInputPort("Duration", 0.01));
addPort(rateRange = new UnitInputPort("RateRange", 0.0));
addPort(amplitudeRange = new UnitInputPort("AmplitudeRange", 0.0));
addPort(durationRange = new UnitInputPort("DurationRange", 0.0));
addPort(density = new UnitInputPort("Density", 0.1));
addPort(output = new UnitOutputPort());
}
private class GrainState {
Grain grain;
int countdown;
double lastDuration;
final static int STATE_IDLE = 0;
final static int STATE_GAP = 1;
final static int STATE_RUNNING = 2;
int state = STATE_IDLE;
private double gapError;
public double next(int i) {
double output = 0.0;
if (state == STATE_RUNNING) {
if (grain.hasMoreValues()) {
output = grain.next();
} else {
startGap(i);
}
} else if (state == STATE_GAP) {
if (countdown > 0) {
countdown -= 1;
} else if (countdown == 0) {
state = STATE_RUNNING;
grain.reset();
setupGrain(grain, i);
double dur = nextDuration(i);
grain.setDuration(dur);
}
} else if (state == STATE_IDLE) {
nextDuration(i); // initialize lastDuration
startGap(i);
}
return output;
}
private double nextDuration(int i) {
double dur = duration.getValues()[i];
dur = scheduler.nextDuration(dur);
lastDuration = dur;
return dur;
}
private void startGap(int i) {
state = STATE_GAP;
double dens = density.getValues()[i];
double gap = scheduler.nextGap(lastDuration, dens) * getFrameRate();
gap += gapError;
countdown = (int) gap;
gapError = gap - countdown;
}
}
public void setGrainArray(Grain[] grains) {
countScaler = 1.0 / grains.length;
states = new GrainState[grains.length];
for (int i = 0; i < states.length; i++) {
states[i] = new GrainState();
states[i].grain = grains[i];
grains[i].setFrameRate(getSynthesisEngine().getFrameRate());
}
}
public void setupGrain(Grain grain, int i) {
double temp = rate.getValues()[i] * calculateOctaveScaler(rateRange.getValues()[i]);
grain.setRate(temp);
// Scale the amplitude range so that we never go above
// original amplitude.
double base = amplitude.getValues()[i];
double offset = base * Math.random() * amplitudeRange.getValues()[i];
grain.setAmplitude(base - offset);
}
public void allocate(int numGrains) {
Grain[] grainArray = new Grain[numGrains];
for (int i = 0; i < numGrains; i++) {
Grain grain = new Grain(new GrainSourceSine(), new RaisedCosineEnvelope());
grainArray[i] = grain;
}
setGrainArray(grainArray);
}
@Override
public UnitOutputPort getOutput() {
return output;
}
private double calculateOctaveScaler(double rangeValue) {
double octaveRange = 0.5 * randomizer.nextRandomDouble() * rangeValue;
return Math.pow(2.0, octaveRange);
}
@Override
public void generate(int start, int limit) {
double[] outputs = output.getValues();
double[] amplitudes = amplitude.getValues();
// double frp = getSynthesisEngine().getFramePeriod();
for (int i = start; i < limit; i++) {
double result = 0.0;
// Mix the grains together.
for (GrainState grainState : states) {
result += grainState.next(i);
}
outputs[i] = result * amplitudes[i] * countScaler;
}
}
}
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