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95 lines
2.5 KiB
95 lines
2.5 KiB
/*
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* Copyright 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef SHARED_OSCILLATOR_H
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#define SHARED_OSCILLATOR_H
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#include <cstdint>
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#include <atomic>
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#include <math.h>
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#include <memory>
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#include "IRenderableAudio.h"
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constexpr double kDefaultFrequency = 440.0;
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constexpr int32_t kDefaultSampleRate = 48000;
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constexpr double kPi = M_PI;
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constexpr double kTwoPi = kPi * 2;
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class Oscillator : public IRenderableAudio {
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public:
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~Oscillator() = default;
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void setWaveOn(bool isWaveOn) {
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mIsWaveOn.store(isWaveOn);
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};
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void setSampleRate(int32_t sampleRate) {
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mSampleRate = sampleRate;
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updatePhaseIncrement();
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};
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void setFrequency(double frequency) {
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mFrequency = frequency;
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updatePhaseIncrement();
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};
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inline void setAmplitude(float amplitude) {
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mAmplitude = amplitude;
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};
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// From IRenderableAudio
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void renderAudio(float *audioData, int32_t numFrames) override {
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if (mIsWaveOn){
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for (int i = 0; i < numFrames; ++i) {
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// Sine wave (sinf)
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//data[i*kChannelCount] = sinf(mPhase) * mAmplitude;
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// Square wave
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if (mPhase <= kPi){
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audioData[i] = -mAmplitude;
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} else {
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audioData[i] = mAmplitude;
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}
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mPhase += mPhaseIncrement;
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if (mPhase > kTwoPi) mPhase -= kTwoPi;
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}
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} else {
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memset(audioData, 0, sizeof(float) * numFrames);
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}
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};
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private:
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std::atomic<bool> mIsWaveOn { false };
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float mPhase = 0.0;
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std::atomic<float> mAmplitude { 0 };
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std::atomic<double> mPhaseIncrement { 0.0 };
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double mFrequency = kDefaultFrequency;
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int32_t mSampleRate = kDefaultSampleRate;
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void updatePhaseIncrement(){
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mPhaseIncrement.store((kTwoPi * mFrequency) / static_cast<double>(mSampleRate));
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};
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};
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#endif //SHARED_OSCILLATOR_H
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