1 /* 2 * Copyright 2019 Google LLC 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 * https://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 #ifndef ANDROID_FXLAB_SINEWAVE_H 18 #define ANDROID_FXLAB_SINEWAVE_H 19 20 #include "PhaseAccumulator.h" 21 22 class SineWave { 23 public: 24 // freq in hz SineWave(float frequency,float amplitude,int sampleRate)25 SineWave(float frequency, float amplitude, int sampleRate): 26 mPhasor(frequency, sampleRate), 27 kAmplitude(amplitude) { } 28 operator()29 float operator() () { 30 return kAmplitude * sinf(mPhasor.incrementPhase()); 31 } 32 33 private: 34 PhaseAccumulator mPhasor; 35 const float kAmplitude; 36 }; 37 #endif //ANDROID_FXLAB_SINEWAVE_H 38