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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.unitgen;
import com.jsyn.ports.UnitInputPort;
import com.jsyn.ports.UnitOutputPort;
import com.jsyn.ports.UnitVariablePort;
import com.softsynth.shared.time.TimeStamp;
/**
* Base class for all oscillators.
*
* @author Phil Burk (C) 2009 Mobileer Inc
*/
public abstract class UnitOscillator extends UnitGenerator implements UnitVoice {
/** Frequency in Hertz. */
public UnitInputPort frequency;
public UnitInputPort amplitude;
public UnitVariablePort phase;
public UnitOutputPort output;
public static final double DEFAULT_FREQUENCY = 440.0;
public static final double DEFAULT_AMPLITUDE = 1.0;
/* Define Unit Ports used by connect() and set(). */
public UnitOscillator() {
addPort(frequency = new UnitInputPort(PORT_NAME_FREQUENCY));
frequency.setup(40.0, DEFAULT_FREQUENCY, 8000.0);
addPort(amplitude = new UnitInputPort(PORT_NAME_AMPLITUDE, DEFAULT_AMPLITUDE));
addPort(phase = new UnitVariablePort(PORT_NAME_PHASE));
addPort(output = new UnitOutputPort(PORT_NAME_OUTPUT));
}
/**
* Convert a frequency in Hertz to a phaseIncrement in the range -1.0 to +1.0
*/
public double convertFrequencyToPhaseIncrement(double freq) {
double phaseIncrement;
try {
phaseIncrement = freq * synthesisEngine.getInverseNyquist();
} catch (NullPointerException e) {
throw new NullPointerException(
"Null Synth! You probably forgot to add this unit to the Synthesizer!");
}
// Clip to range.
phaseIncrement = (phaseIncrement > 1.0) ? 1.0 : ((phaseIncrement < -1.0) ? -1.0
: phaseIncrement);
return phaseIncrement;
}
@Override
public UnitOutputPort getOutput() {
return output;
}
public void noteOn(double freq, double ampl) {
frequency.set(freq);
amplitude.set(ampl);
}
public void noteOff() {
amplitude.set(0.0);
}
@Override
public void noteOff(TimeStamp timeStamp) {
amplitude.set(0.0, timeStamp);
}
@Override
public void noteOn(double freq, double ampl, TimeStamp timeStamp) {
frequency.set(freq, timeStamp);
amplitude.set(ampl, timeStamp);
}
@Override
public void usePreset(int presetIndex) {
}
}
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