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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;
/**
* Linear CrossFade between parts of the input.
* <P>
* Mix input[0] and input[1] based on the value of "fade". When fade is -1, output is all input[0].
* When fade is 0, output is half input[0] and half input[1]. When fade is +1, output is all
* input[1].
* <P>
*
* @author Phil Burk (C) 2009 Mobileer Inc
* @version 016
* @see Pan
*/
public class CrossFade extends UnitGenerator {
public UnitInputPort input;
public UnitInputPort fade;
public UnitOutputPort output;
/* Define Unit Ports used by connect() and set(). */
public CrossFade() {
addPort(input = new UnitInputPort(2, "Input"));
addPort(fade = new UnitInputPort("Fade"));
addPort(output = new UnitOutputPort());
}
@Override
public void generate(int start, int limit) {
double[] input0s = input.getValues(0);
double[] input1s = input.getValues(1);
double[] fades = fade.getValues();
double[] outputs = output.getValues();
for (int i = start; i < limit; i++) {
// Scale and offset to 0.0 to 1.0 range.
double gain = (fades[i] * 0.5) + 0.5;
outputs[i] = (input0s[i] * (1.0 - gain)) + (input1s[i] * gain);
}
}
}
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