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/*
* Copyright 2023 Phil Burk
*
* 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.dsp.SimpleDelay;
import com.jsyn.ports.UnitInputPort;
/**
* Delay with multiple read positions and associated gains.
*/
public class MultiTapDelay extends UnitFilter {
/** Pre-delay time in milliseconds. */
public UnitInputPort preDelayMillis;
private final int mMaxPreDelayFrames;
private SimpleDelay mPreDelay;
private SimpleDelay mDelay;
private final int[] mPositions;
private final float[] mGains;
private int mPreDelayFrames = 0;
/**
* Construct a delay line with specified taps.
* The allocated size of the delay line will be the maximum position plus the maxPreDelayFrames.
* @param positions delay index, eg. 172 for Z(n-172)
* @param gains multiplier for the corresponding position
* @param maxPreDelayFrames extra allocated frames for pre-delay before the taps
*/
public MultiTapDelay(final int[] positions,
final float[] gains,
final int maxPreDelayFrames) {
mPositions = positions;
mGains = gains;
preDelayMillis = new UnitInputPort("PreDelayMillis");
double maxMillis = maxPreDelayFrames * 1000.0 / 44100; // TODO handle unknown frame rate better
preDelayMillis.setup(0.0, Math.min(10.0, maxMillis), maxMillis);
addPort(preDelayMillis);
mMaxPreDelayFrames = Math.max(1, maxPreDelayFrames);
mPreDelay = new SimpleDelay(maxPreDelayFrames);
int maxPosition = 0;
for (int position : positions) {
maxPosition = Math.max(maxPosition, position);
}
mDelay = new SimpleDelay(maxPosition);
}
@Override
public void generate(int start, int limit) {
double[] inputs = input.getValues();
double[] outputs = output.getValues();
double preDelayMS = preDelayMillis.getValues()[0];
int preDelayFrames = (int)(preDelayMS * 0.001 * getFrameRate());
preDelayFrames = Math.max(1, Math.min(mMaxPreDelayFrames, preDelayFrames));
for (int i = start; i < limit; i++) {
mPreDelay.write((float) inputs[i]);
mDelay.write(mPreDelay.read(preDelayFrames));
mPreDelay.advance();
double sum = 0.0;
for (int tap = 0; tap < mPositions.length; tap++) {
sum += mDelay.read(mPositions[tap]) * mGains[tap];
}
mDelay.advance();
outputs[i] = sum; // mix taps
}
}
}
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