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94 lines
2.9 KiB
94 lines
2.9 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 SOUNDBOARD_SYNTH_H
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#define SOUNDBOARD_SYNTH_H
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#include <array>
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#include <TappableAudioSource.h>
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#include <SynthSound.h>
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#include <Mixer.h>
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#include <MonoToStereo.h>
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constexpr float kOscBaseFrequency = 196.00; // Start at G3
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constexpr float kOscFrequencyMultiplier = 1.05946309436;
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constexpr float kOscBaseAmplitude = 0.20;
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constexpr float kOscAmplitudeMultiplier = 0.96;
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class Synth : public IRenderableAudio, public ITappable {
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public:
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static ::std::shared_ptr<Synth> create(const int32_t sampleRate, const int32_t channelCount, const int32_t numSignals) {
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return ::std::make_shared<Synth>(sampleRate, channelCount, numSignals);
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}
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Synth(const int32_t sampleRate, const int32_t channelCount, const int32_t numSignals) {
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mNumSignals = numSignals;
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mOscs = std::make_unique<SynthSound[]>(numSignals);
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float curFrequency = kOscBaseFrequency;
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float curAmplitude = kOscBaseAmplitude;
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for (int i = 0; i < numSignals; ++i) {
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mOscs[i].setSampleRate(sampleRate);
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mOscs[i].setFrequency(curFrequency);
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curFrequency *= kOscFrequencyMultiplier;
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mOscs[i].setAmplitude(curAmplitude);
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curAmplitude *= kOscAmplitudeMultiplier;
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mMixer.addTrack(&mOscs[i]);
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}
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if (channelCount == 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 noteOff(int32_t noteIndex) {
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mOscs[noteIndex].noteOff();
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}
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void noteOn(int32_t noteIndex) {
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mOscs[noteIndex].noteOn();
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}
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void tap(bool isOn) override {
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for (int i = 0; i < mNumSignals; i++) {
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if (isOn) {
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mOscs[i].noteOn();
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} else {
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mOscs[i].noteOff();
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}
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}
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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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int32_t mNumSignals;
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std::unique_ptr<SynthSound[]> 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 //SOUNDBOARD_SYNTH_H
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