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80 lines
2.9 KiB
C++
80 lines
2.9 KiB
C++
/*
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* Copyright 2019 Google LLC
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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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* https://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 ANDROID_FXLAB_DUPLEXCALLBACK_H
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#define ANDROID_FXLAB_DUPLEXCALLBACK_H
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#include <oboe/Oboe.h>
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// This callback handles mono in, stereo out synchronized audio passthrough.
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// It takes a function which operates on two pointers (beginning and end)
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// of underlying data.
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template<class numeric_type>
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class DuplexCallback : public oboe::AudioStreamCallback {
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public:
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DuplexCallback(oboe::AudioStream &inStream,
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std::function<void(numeric_type *, numeric_type *)> fun,
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size_t buffer_size, std::function<void(void)> restartFunction) :
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kBufferSize(buffer_size), inRef(inStream), f(fun), restart(restartFunction) {}
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oboe::DataCallbackResult
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onAudioReady(oboe::AudioStream *outputStream, void *audioData, int32_t numFrames) override {
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auto *outputData = static_cast<numeric_type *>(audioData);
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auto outputChannelCount = outputStream->getChannelCount();
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// Silence first to simplify glitch detection
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std::fill(outputData, outputData + numFrames * outputChannelCount, 0);
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oboe::ResultWithValue<int32_t> result = inRef.read(inputBuffer.get(), numFrames, 0);
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int32_t framesRead = result.value();
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if (!result) {
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inRef.requestStop();
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return oboe::DataCallbackResult::Stop;
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}
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if (mSpinUpCallbacks > 0 && framesRead > 0) {
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mSpinUpCallbacks--;
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return oboe::DataCallbackResult::Continue;
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}
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f(inputBuffer.get(), inputBuffer.get() + framesRead);
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for (int i = 0; i < framesRead; i++) {
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for (size_t j = 0; j < outputChannelCount; j++) {
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*outputData++ = inputBuffer[i];
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}
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}
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return oboe::DataCallbackResult::Continue;
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}
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void onErrorAfterClose(oboe::AudioStream *, oboe::Result result) override {
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inRef.close();
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if (result == oboe::Result::ErrorDisconnected) {
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restart();
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}
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}
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private:
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int mSpinUpCallbacks = 10; // We will let the streams sync for the first few valid frames
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const size_t kBufferSize;
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oboe::AudioStream &inRef;
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std::function<void(numeric_type *, numeric_type *)> f;
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std::function<void(void)> restart;
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std::unique_ptr<numeric_type[]> inputBuffer = std::make_unique<numeric_type[]>(kBufferSize);
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};
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#endif //ANDROID_FXLAB_DUPLEXCALLBACK_H
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