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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 <math.h>
#include "ExponentialShape.h"
ExponentialShape::ExponentialShape()
: FlowGraphFilter(1) {
}
int32_t ExponentialShape::onProcess(int32_t numFrames) {
float *inputs = input.getBuffer();
float *outputs = output.getBuffer();
for (int i = 0; i < numFrames; i++) {
float normalizedPhase = (inputs[i] * 0.5) + 0.5;
outputs[i] = mMinimum * powf(mRatio, normalizedPhase);
}
return numFrames;
}
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