| /* |
| * 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; |
| } |