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/*
* Copyright 1997 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;
/**
* Pan unit. The profile is constant amplitude and not constant energy.
* <P>
* Takes an input and pans it between two outputs based on value of pan. When pan is -1, output[0]
* is input, and output[1] is zero. When pan is 0, output[0] and output[1] are both input/2. When
* pan is +1, output[0] is zero, and output[1] is input.
* <P>
*
* @author (C) 1997 Phil Burk, SoftSynth.com
* @see Select
*/
public class Pan extends UnitGenerator {
public UnitInputPort input;
/**
* Pan control varies from -1.0 for full left to +1.0 for full right. Set to 0.0 for center.
*/
public UnitInputPort pan;
public UnitOutputPort output;
public Pan() {
addPort(input = new UnitInputPort("Input"));
addPort(pan = new UnitInputPort("Pan"));
pan.setup(-1.0, 0.0, 1.0);
addPort(output = new UnitOutputPort(2, "Output"));
}
@Override
public void generate(int start, int limit) {
double[] inputs = input.getValues();
double[] panPtr = pan.getValues();
double[] outputs_0 = output.getValues(0);
double[] outputs_1 = output.getValues(1);
for (int i = start; i < limit; i++) {
double gainB = (panPtr[i] * 0.5) + 0.5; /*
* Scale and offset to 0.0 to 1.0
*/
double gainA = 1.0 - gainB;
double inVal = inputs[i];
outputs_0[i] = inVal * gainA;
outputs_1[i] = inVal * gainB;
}
}
}
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