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/*
* Copyright 2022 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.dsp;
/**
* Delay line based on a circular buffer.
*/
public class SimpleDelay {
private float[] mBuffer;
private int mCursor;
public SimpleDelay(int length) {
mBuffer = new float[length];
}
/**
* Read a value from the delay line.
* @param position positive delay in frames
* @return delayed value
*/
public float read(int position) {
int index = mCursor - position;
if (index < 0) {
index += mBuffer.length;
}
return mBuffer[index];
}
/**
* Write a new value to the head of the delay line.
* This does not advance the cursor.
* @param input sample value
*/
public void write(float input) {
mBuffer[mCursor] = input;
}
/**
* Advance the cursor position. Wrap around in a circle.
*/
public void advance() {
mCursor++;
if (mCursor >= mBuffer.length) mCursor = 0;
}
/**
* Add a new value and return the oldest value in the delay line.
* @param input sample value
* @return oldest value
*/
public float process(float input) {
float output = mBuffer[mCursor];
write(input);
advance();
return output;
}
}
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