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/*
* Copyright 2019 The Android Open Source Project
*
* 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.
*/
#include <algorithm>
#include "InterpolatingDelayLine.h"
InterpolatingDelayLine::InterpolatingDelayLine(int32_t delaySize) {
mDelaySize = delaySize;
mDelayLine = std::make_unique<float[]>(delaySize);
}
float InterpolatingDelayLine::process(float delay, float input) {
float *writeAddress = mDelayLine.get() + mCursor;
*writeAddress = input;
mDelayLine.get()[mCursor] = input;
int32_t delayInt = std::min(mDelaySize - 1, (int32_t) delay);
int32_t readIndex = mCursor - delayInt;
if (readIndex < 0) {
readIndex += mDelaySize;
}
// TODO interpolate
float *readAddress = mDelayLine.get() + readIndex;
float output = *readAddress;
mCursor++;
if (mCursor >= mDelaySize) {
mCursor = 0;
}
return output;
};
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