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71 lines
2.1 KiB
C++
71 lines
2.1 KiB
C++
/*
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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 MEGADRONE_SYNTH_H
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#define MEGADRONE_SYNTH_H
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#include <array>
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#include <TappableAudioSource.h>
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#include <Oscillator.h>
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#include <Mixer.h>
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#include <MonoToStereo.h>
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constexpr int kNumOscillators = 100;
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constexpr float kOscBaseFrequency = 116.0;
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constexpr float kOscDivisor = 33;
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constexpr float kOscAmplitude = 0.009;
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class Synth : public TappableAudioSource {
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public:
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Synth(int32_t sampleRate, int32_t channelCount) :
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TappableAudioSource(sampleRate, channelCount) {
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for (int i = 0; i < kNumOscillators; ++i) {
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mOscs[i].setSampleRate(mSampleRate);
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mOscs[i].setFrequency(kOscBaseFrequency + (static_cast<float>(i) / kOscDivisor));
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mOscs[i].setAmplitude(kOscAmplitude);
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mMixer.addTrack(&mOscs[i]);
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}
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if (mChannelCount == oboe::ChannelCount::Stereo) {
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mOutputStage = &mConverter;
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} else {
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mOutputStage = &mMixer;
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}
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}
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void tap(bool isOn) override {
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for (auto &osc : mOscs) osc.setWaveOn(isOn);
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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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mOutputStage->renderAudio(audioData, numFrames);
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};
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virtual ~Synth() {
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}
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private:
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// Rendering objects
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std::array<Oscillator, kNumOscillators> mOscs;
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Mixer mMixer;
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MonoToStereo mConverter = MonoToStereo(&mMixer);
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IRenderableAudio *mOutputStage; // This will point to either the mixer or converter, so it needs to be raw
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};
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#endif //MEGADRONE_SYNTH_H
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