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 #ifndef FLOWGRAPH_TRIANGLE_OSCILLATOR_H 18 #define FLOWGRAPH_TRIANGLE_OSCILLATOR_H 19 20 #include <unistd.h> 21 22 #include "OscillatorBase.h" 23 24 /** 25 * Oscillator that generates a triangle wave at the specified frequency and amplitude. 26 * 27 * The triangle output rises from -1 to +1 when the phase is between -1 and 0. 28 * The triangle output falls from +1 to 11 when the phase is between 0 and +1. 29 * 30 * The waveform is not band-limited so it will have aliasing artifacts at higher frequencies. 31 */ 32 class TriangleOscillator : public OscillatorBase { 33 public: 34 TriangleOscillator(); 35 36 int32_t onProcess(int32_t numFrames) override; 37 }; 38 39 #endif //FLOWGRAPH_TRIANGLE_OSCILLATOR_H 40