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//
// Copyright © 2021 Arm Ltd and Contributors. All rights reserved.
// SPDX-License-Identifier: MIT
//
#include <cmath>
#include <numeric>
#include <algorithm>
#include <memory>
#include "MathUtils.hpp"
#include "SlidingWindow.hpp"
#include "DsCNNPreprocessor.hpp"
std::vector<int8_t> kws::DsCNNPreprocessor::Invoke(const float* audioData, size_t dataSize,
int quantOffset, float quantScale)
{
auto window = SlidingWindow<const float>(
audioData, dataSize,
this->m_windowLen, this->m_windowStride);
uint32_t mfccBufIdx = 0;
std::vector<int8_t> outputBuffer;
// While we can slide over the window
while (window.HasNext())
{
const float* mfccWindow = window.Next();
auto mfccAudioData = std::vector<float>(mfccWindow, mfccWindow + this->m_windowLen);
auto mfcc = this->m_mfcc->MfccComputeQuant<int8_t>(mfccAudioData, quantScale, quantOffset);
std::copy(mfcc.begin(), mfcc.end(), std::back_inserter(outputBuffer));
++mfccBufIdx;
}
return outputBuffer;
}
kws::DsCNNPreprocessor::DsCNNPreprocessor(const uint32_t windowLen, const uint32_t windowStride,
std::unique_ptr<DsCnnMFCC> mfccInst) :
m_windowLen{windowLen}, m_windowStride{windowStride}, m_mfcc{std::move(mfccInst)} {}
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