1 /* 2 * Copyright 2018 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 #include <unistd.h> 19 20 #include "ImpulseOscillator.h" 21 ImpulseOscillator()22ImpulseOscillator::ImpulseOscillator() 23 : OscillatorBase() { 24 } 25 onProcess(int32_t numFrames)26int32_t ImpulseOscillator::onProcess(int32_t numFrames) { 27 const float *frequencies = frequency.getBuffer(); 28 const float *amplitudes = amplitude.getBuffer(); 29 float *buffer = output.getBuffer(); 30 31 for (int i = 0; i < numFrames; i++) { 32 float value = 0.0f; 33 mPhase += mFrequencyToPhaseIncrement * frequencies[i]; 34 if (mPhase >= 1.0f) { 35 value = amplitudes[i]; // spike 36 mPhase -= 2.0f; 37 } 38 *buffer++ = value; 39 } 40 41 return numFrames; 42 } 43