1 /* 2 * Copyright 2019 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include <math.h> 18 19 #include "ExponentialShape.h" 20 ExponentialShape()21ExponentialShape::ExponentialShape() 22 : FlowGraphFilter(1) { 23 } 24 onProcess(int32_t numFrames)25int32_t ExponentialShape::onProcess(int32_t numFrames) { 26 float *inputs = input.getBuffer(); 27 float *outputs = output.getBuffer(); 28 29 for (int i = 0; i < numFrames; i++) { 30 float normalizedPhase = (inputs[i] * 0.5) + 0.5; 31 outputs[i] = mMinimum * powf(mRatio, normalizedPhase); 32 } 33 34 return numFrames; 35 } 36