| /* |
| * Copyright 2018 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 <unistd.h> |
| |
| #include "ImpulseOscillator.h" |
| |
| ImpulseOscillator::ImpulseOscillator() |
| : OscillatorBase() { |
| } |
| |
| int32_t ImpulseOscillator::onProcess(int numFrames) { |
| const float *frequencies = frequency.getBuffer(); |
| const float *amplitudes = amplitude.getBuffer(); |
| float *buffer = output.getBuffer(); |
| |
| for (int i = 0; i < numFrames; i++) { |
| float value = 0.0f; |
| mPhase += mFrequencyToPhaseIncrement * frequencies[i]; |
| if (mPhase >= 1.0f) { |
| value = amplitudes[i]; // spike |
| mPhase -= 2.0f; |
| } |
| *buffer++ = value; |
| } |
| |
| return numFrames; |
| } |