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51 lines
1.7 KiB
C++
51 lines
1.7 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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#include "SoundGenerator.h"
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SoundGenerator::SoundGenerator(int32_t sampleRate, int32_t channelCount) :
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TappableAudioSource(sampleRate, channelCount)
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, mOscillators(std::make_unique<Oscillator[]>(channelCount)){
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double frequency = 440.0;
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constexpr double interval = 110.0;
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constexpr float amplitude = 1.0;
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// Set up the oscillators
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for (int i = 0; i < mChannelCount; ++i) {
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mOscillators[i].setFrequency(frequency);
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mOscillators[i].setSampleRate(mSampleRate);
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mOscillators[i].setAmplitude(amplitude);
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frequency += interval;
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}
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}
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void SoundGenerator::renderAudio(float *audioData, int32_t numFrames) {
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// Render each oscillator into its own channel
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std::fill_n(mBuffer.get(), kSharedBufferSize, 0);
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for (int i = 0; i < mChannelCount; ++i) {
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mOscillators[i].renderAudio(mBuffer.get(), numFrames);
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for (int j = 0; j < numFrames; ++j) {
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audioData[(j * mChannelCount) + i] = mBuffer[j];
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}
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}
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}
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void SoundGenerator::tap(bool isOn) {
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for (int i = 0; i < mChannelCount; ++i) {
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mOscillators[i].setWaveOn(isOn);
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}
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}
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