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/*
* Copyright 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "common/OboeDebug.h"
#include "FullDuplexEcho.h"
oboe::Result FullDuplexEcho::start() {
int32_t delayFrames = (int32_t) (kMaxDelayTimeSeconds * getOutputStream()->getSampleRate());
mDelayLine = std::make_unique<InterpolatingDelayLine>(delayFrames);
// Use peak detector for input streams
mNumChannels = getInputStream()->getChannelCount();
mPeakDetectors = std::make_unique<PeakDetector[]>(mNumChannels);
return FullDuplexStreamWithConversion::start();
}
double FullDuplexEcho::getPeakLevel(int index) {
if (mPeakDetectors == nullptr) {
LOGE("%s() called before setup()", __func__);
return -1.0;
} else if (index < 0 || index >= mNumChannels) {
LOGE("%s(), index out of range, 0 <= %d < %d", __func__, index, mNumChannels.load());
return -2.0;
}
return mPeakDetectors[index].getLevel();
}
oboe::DataCallbackResult FullDuplexEcho::onBothStreamsReadyFloat(
const float *inputData,
int numInputFrames,
float *outputData,
int numOutputFrames) {
int32_t framesToEcho = std::min(numInputFrames, numOutputFrames);
auto *inputFloat = const_cast<float *>(inputData);
float *outputFloat = outputData;
// zero out entire output array
memset(outputFloat, 0, static_cast<size_t>(numOutputFrames)
* static_cast<size_t>(getOutputStream()->getBytesPerFrame()));
int32_t inputStride = getInputStream()->getChannelCount();
int32_t outputStride = getOutputStream()->getChannelCount();
float delayFrames = mDelayTimeSeconds * getOutputStream()->getSampleRate();
while (framesToEcho-- > 0) {
*outputFloat = mDelayLine->process(delayFrames, *inputFloat); // mono delay
for (int iChannel = 0; iChannel < inputStride; iChannel++) {
float sample = * (inputFloat + iChannel);
mPeakDetectors[iChannel].process(sample);
}
inputFloat += inputStride;
outputFloat += outputStride;
}
return oboe::DataCallbackResult::Continue;
};
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