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44 lines
1.4 KiB
C++
44 lines
1.4 KiB
C++
/*
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* Copyright 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <algorithm>
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#include "InterpolatingDelayLine.h"
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InterpolatingDelayLine::InterpolatingDelayLine(int32_t delaySize) {
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mDelaySize = delaySize;
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mDelayLine = std::make_unique<float[]>(delaySize);
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}
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float InterpolatingDelayLine::process(float delay, float input) {
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float *writeAddress = mDelayLine.get() + mCursor;
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*writeAddress = input;
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mDelayLine.get()[mCursor] = input;
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int32_t delayInt = std::min(mDelaySize - 1, (int32_t) delay);
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int32_t readIndex = mCursor - delayInt;
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if (readIndex < 0) {
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readIndex += mDelaySize;
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}
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// TODO interpolate
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float *readAddress = mDelayLine.get() + readIndex;
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float output = *readAddress;
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mCursor++;
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if (mCursor >= mDelaySize) {
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mCursor = 0;
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}
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return output;
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};
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