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/*
* Copyright 2014 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;
/**
* Mixer with monophonic inputs and two channels of output. Each signal can be panned left or right
* using an equal power curve. The "left" signal will be on output part zero. The "right" signal
* will be on output part one.
*
* @author Phil Burk (C) 2014 Mobileer Inc
* @see MixerMono
* @see MixerStereoRamped
*/
public class MixerStereo extends MixerMono {
/**
* Set to -1.0 for all left channel, 0.0 for center, or +1.0 for all right. Or anywhere in
* between.
*/
public UnitInputPort pan;
protected PanTracker[] panTrackers;
static class PanTracker {
double previousPan = Double.MAX_VALUE; // so we update immediately
double leftGain;
double rightGain;
public void update(double pan) {
if (pan != previousPan) {
// fastSine range is -1.0 to +1.0 for full cycle.
// We want a quarter cycle. So map -1.0 to +1.0 into 0.0 to 0.5
double phase = pan * 0.25 + 0.25;
leftGain = SineOscillator.fastSin(0.5 - phase);
rightGain = SineOscillator.fastSin(phase);
previousPan = pan;
}
}
}
public MixerStereo(int numInputs) {
super(numInputs);
addPort(pan = new UnitInputPort(numInputs, "Pan"));
pan.setup(-1.0, 0.0, 1.0);
panTrackers = new PanTracker[numInputs];
for (int i = 0; i < numInputs; i++) {
panTrackers[i] = new PanTracker();
}
}
@Override
public int getNumOutputs() {
return 2;
}
@Override
public void generate(int start, int limit) {
double[] amplitudes = amplitude.getValues(0);
double[] outputs0 = output.getValues(0);
double[] outputs1 = output.getValues(1);
for (int i = start; i < limit; i++) {
double sum0 = 0.0;
double sum1 = 0.0;
for (int n = 0; n < input.getNumParts(); n++) {
double[] inputs = input.getValues(n);
double[] gains = gain.getValues(n);
double[] pans = pan.getValues(n);
PanTracker panTracker = panTrackers[n];
panTracker.update(pans[i]);
double scaledInput = inputs[i] * gains[i];
sum0 += scaledInput * panTracker.leftGain;
sum1 += scaledInput * panTracker.rightGain;
}
double amp = amplitudes[i];
outputs0[i] = sum0 * amp;
outputs1[i] = sum1 * amp;
}
}
}
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