MLECO-3183: Refactoring application sources

Platform agnostic application sources are moved into application
api module with their own independent CMake projects.

Changes for MLECO-3080 also included - they create CMake projects
individial API's (again, platform agnostic) that dependent on the
common logic. The API for KWS_API "joint" API has been removed and
now the use case relies on individual KWS, and ASR API libraries.

Change-Id: I1f7748dc767abb3904634a04e0991b74ac7b756d
Signed-off-by: Kshitij Sisodia <kshitij.sisodia@arm.com>

1 files changed, 0 insertions, 316 deletions

diff --git a/source/use_case/ad/src/MelSpectrogram.cc b/source/use_case/ad/src/MelSpectrogram.cc
deleted file mode 100644
index ff0c536..0000000
--- a/source/use_case/ad/src/MelSpectrogram.cc
+++ /dev/null
@@ -1,316 +0,0 @@
-/*
- * Copyright (c) 2021 Arm Limited. All rights reserved.
- * SPDX-License-Identifier: Apache-2.0
- *
- * 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 "MelSpectrogram.hpp"
-
-#include "PlatformMath.hpp"
-#include "log_macros.h"
-
-#include <cfloat>
-#include <cinttypes>
-
-namespace arm {
-namespace app {
-namespace audio {
-
-    MelSpecParams::MelSpecParams(
-            const float samplingFreq,
-            const uint32_t numFbankBins,
-            const float melLoFreq,
-            const float melHiFreq,
-            const uint32_t frameLen,
-            const bool useHtkMethod):
-            m_samplingFreq(samplingFreq),
-            m_numFbankBins(numFbankBins),
-            m_melLoFreq(melLoFreq),
-            m_melHiFreq(melHiFreq),
-            m_frameLen(frameLen),
-
-            /* Smallest power of 2 >= frame length. */
-            m_frameLenPadded(pow(2, ceil((log(frameLen)/log(2))))),
-            m_useHtkMethod(useHtkMethod)
-    {}
-
-    std::string MelSpecParams::Str() const
-    {
-        char strC[1024];
-        snprintf(strC, sizeof(strC) - 1, "\n   \
-            \n\t Sampling frequency:         %f\
-            \n\t Number of filter banks:     %" PRIu32 "\
-            \n\t Mel frequency limit (low):  %f\
-            \n\t Mel frequency limit (high): %f\
-            \n\t Frame length:               %" PRIu32 "\
-            \n\t Padded frame length:        %" PRIu32 "\
-            \n\t Using HTK for Mel scale:    %s\n",
-            this->m_samplingFreq, this->m_numFbankBins, this->m_melLoFreq,
-            this->m_melHiFreq, this->m_frameLen,
-            this->m_frameLenPadded, this->m_useHtkMethod ? "yes" : "no");
-        return std::string{strC};
-    }
-
-    MelSpectrogram::MelSpectrogram(const MelSpecParams& params):
-            m_params(params),
-            m_filterBankInitialised(false)
-    {
-        this->m_buffer = std::vector<float>(
-                this->m_params.m_frameLenPadded, 0.0);
-        this->m_frame = std::vector<float>(
-                this->m_params.m_frameLenPadded, 0.0);
-        this->m_melEnergies = std::vector<float>(
-                this->m_params.m_numFbankBins, 0.0);
-
-        this->m_windowFunc = std::vector<float>(this->m_params.m_frameLen);
-        const auto multiplier = static_cast<float>(2 * M_PI / this->m_params.m_frameLen);
-
-        /* Create window function. */
-        for (size_t i = 0; i < this->m_params.m_frameLen; ++i) {
-            this->m_windowFunc[i] = (0.5 - (0.5 *
-                                             math::MathUtils::CosineF32(static_cast<float>(i) * multiplier)));
-        }
-
-        math::MathUtils::FftInitF32(this->m_params.m_frameLenPadded, this->m_fftInstance);
-        debug("Instantiated Mel Spectrogram object: %s\n", this->m_params.Str().c_str());
-    }
-
-    void MelSpectrogram::Init()
-    {
-        this->InitMelFilterBank();
-    }
-
-    float MelSpectrogram::MelScale(const float freq, const bool useHTKMethod)
-    {
-        if (useHTKMethod) {
-            return 1127.0f * logf (1.0f + freq / 700.0f);
-        } else {
-            /* Slaney formula for mel scale. */
-            float mel = freq / ms_freqStep;
-
-            if (freq >= ms_minLogHz) {
-                mel = ms_minLogMel + logf(freq / ms_minLogHz) / ms_logStep;
-            }
-            return mel;
-        }
-    }
-
-    float MelSpectrogram::InverseMelScale(const float melFreq, const bool useHTKMethod)
-    {
-        if (useHTKMethod) {
-            return 700.0f * (expf (melFreq / 1127.0f) - 1.0f);
-        } else {
-            /* Slaney formula for inverse mel scale. */
-            float freq = ms_freqStep * melFreq;
-
-            if (melFreq >= ms_minLogMel) {
-                freq = ms_minLogHz * expf(ms_logStep * (melFreq - ms_minLogMel));
-            }
-            return freq;
-        }
-    }
-
-    bool MelSpectrogram::ApplyMelFilterBank(
-            std::vector<float>&                 fftVec,
-            std::vector<std::vector<float>>&    melFilterBank,
-            std::vector<uint32_t>&               filterBankFilterFirst,
-            std::vector<uint32_t>&               filterBankFilterLast,
-            std::vector<float>&                 melEnergies)
-    {
-        const size_t numBanks = melEnergies.size();
-
-        if (numBanks != filterBankFilterFirst.size() ||
-            numBanks != filterBankFilterLast.size()) {
-            printf_err("unexpected filter bank lengths\n");
-            return false;
-        }
-
-        for (size_t bin = 0; bin < numBanks; ++bin) {
-            auto filterBankIter = melFilterBank[bin].begin();
-            auto end = melFilterBank[bin].end();
-            float melEnergy = FLT_MIN; /* Avoid log of zero at later stages */
-            const uint32_t firstIndex = filterBankFilterFirst[bin];
-            const uint32_t lastIndex = std::min<int32_t>(filterBankFilterLast[bin], fftVec.size() - 1);
-
-            for (uint32_t i = firstIndex; i <= lastIndex && filterBankIter != end; ++i) {
-                float energyRep = math::MathUtils::SqrtF32(fftVec[i]);
-                melEnergy += (*filterBankIter++ * energyRep);
-            }
-
-            melEnergies[bin] = melEnergy;
-        }
-
-        return true;
-    }
-
-    void MelSpectrogram::ConvertToLogarithmicScale(std::vector<float>& melEnergies)
-    {
-        for (float& melEnergy : melEnergies) {
-            melEnergy = logf(melEnergy);
-        }
-    }
-
-    void MelSpectrogram::ConvertToPowerSpectrum()
-    {
-        const uint32_t halfDim = this->m_buffer.size() / 2;
-
-        /* Handle this special case. */
-        float firstEnergy = this->m_buffer[0] * this->m_buffer[0];
-        float lastEnergy = this->m_buffer[1] * this->m_buffer[1];
-
-        math::MathUtils::ComplexMagnitudeSquaredF32(
-                this->m_buffer.data(),
-                this->m_buffer.size(),
-                this->m_buffer.data(),
-                this->m_buffer.size()/2);
-
-        this->m_buffer[0] = firstEnergy;
-        this->m_buffer[halfDim] = lastEnergy;
-    }
-
-    float MelSpectrogram::GetMelFilterBankNormaliser(
-            const float&    leftMel,
-            const float&    rightMel,
-            const bool      useHTKMethod)
-    {
-        UNUSED(leftMel);
-        UNUSED(rightMel);
-        UNUSED(useHTKMethod);
-
-        /* By default, no normalisation => return 1 */
-        return 1.f;
-    }
-
-    void MelSpectrogram::InitMelFilterBank()
-    {
-        if (!this->IsMelFilterBankInited()) {
-            this->m_melFilterBank = this->CreateMelFilterBank();
-            this->m_filterBankInitialised = true;
-        }
-    }
-
-    bool MelSpectrogram::IsMelFilterBankInited() const
-    {
-        return this->m_filterBankInitialised;
-    }
-
-    std::vector<float> MelSpectrogram::ComputeMelSpec(const std::vector<int16_t>& audioData, float trainingMean)
-    {
-        this->InitMelFilterBank();
-
-        /* TensorFlow way of normalizing .wav data to (-1, 1). */
-        constexpr float normaliser = 1.0/(1<<15);
-        for (size_t i = 0; i < this->m_params.m_frameLen; ++i) {
-            this->m_frame[i] = static_cast<float>(audioData[i]) * normaliser;
-        }
-
-        /* Apply window function to input frame. */
-        for(size_t i = 0; i < this->m_params.m_frameLen; ++i) {
-            this->m_frame[i] *= this->m_windowFunc[i];
-        }
-
-        /* Set remaining frame values to 0. */
-        std::fill(this->m_frame.begin() + this->m_params.m_frameLen,this->m_frame.end(), 0);
-
-        /* Compute FFT. */
-        math::MathUtils::FftF32(this->m_frame, this->m_buffer, this->m_fftInstance);
-
-        /* Convert to power spectrum. */
-        this->ConvertToPowerSpectrum();
-
-        /* Apply mel filterbanks. */
-        if (!this->ApplyMelFilterBank(this->m_buffer,
-                                      this->m_melFilterBank,
-                                      this->m_filterBankFilterFirst,
-                                      this->m_filterBankFilterLast,
-                                      this->m_melEnergies)) {
-            printf_err("Failed to apply MEL filter banks\n");
-        }
-
-        /* Convert to logarithmic scale */
-        this->ConvertToLogarithmicScale(this->m_melEnergies);
-
-        /* Perform mean subtraction. */
-        for (auto& energy:this->m_melEnergies) {
-            energy -= trainingMean;
-        }
-
-        return this->m_melEnergies;
-    }
-
-    std::vector<std::vector<float>> MelSpectrogram::CreateMelFilterBank()
-    {
-        size_t numFftBins = this->m_params.m_frameLenPadded / 2;
-        float fftBinWidth = static_cast<float>(this->m_params.m_samplingFreq) / this->m_params.m_frameLenPadded;
-
-        float melLowFreq = MelSpectrogram::MelScale(this->m_params.m_melLoFreq,
-                                          this->m_params.m_useHtkMethod);
-        float melHighFreq = MelSpectrogram::MelScale(this->m_params.m_melHiFreq,
-                                           this->m_params.m_useHtkMethod);
-        float melFreqDelta = (melHighFreq - melLowFreq) / (this->m_params.m_numFbankBins + 1);
-
-        std::vector<float> thisBin = std::vector<float>(numFftBins);
-        std::vector<std::vector<float>> melFilterBank(
-                this->m_params.m_numFbankBins);
-        this->m_filterBankFilterFirst =
-                std::vector<uint32_t>(this->m_params.m_numFbankBins);
-        this->m_filterBankFilterLast =
-                std::vector<uint32_t>(this->m_params.m_numFbankBins);
-
-        for (size_t bin = 0; bin < this->m_params.m_numFbankBins; bin++) {
-            float leftMel = melLowFreq + bin * melFreqDelta;
-            float centerMel = melLowFreq + (bin + 1) * melFreqDelta;
-            float rightMel = melLowFreq + (bin + 2) * melFreqDelta;
-
-            uint32_t firstIndex = 0;
-            uint32_t lastIndex = 0;
-            bool firstIndexFound = false;
-            const float normaliser = this->GetMelFilterBankNormaliser(leftMel, rightMel, this->m_params.m_useHtkMethod);
-
-            for (size_t i = 0; i < numFftBins; ++i) {
-                float freq = (fftBinWidth * i); /* Center freq of this fft bin. */
-                float mel = MelSpectrogram::MelScale(freq, this->m_params.m_useHtkMethod);
-                thisBin[i] = 0.0;
-
-                if (mel > leftMel && mel < rightMel) {
-                    float weight;
-                    if (mel <= centerMel) {
-                        weight = (mel - leftMel) / (centerMel - leftMel);
-                    } else {
-                        weight = (rightMel - mel) / (rightMel - centerMel);
-                    }
-
-                    thisBin[i] = weight * normaliser;
-                    if (!firstIndexFound) {
-                        firstIndex = i;
-                        firstIndexFound = true;
-                    }
-                    lastIndex = i;
-                }
-            }
-
-            this->m_filterBankFilterFirst[bin] = firstIndex;
-            this->m_filterBankFilterLast[bin] = lastIndex;
-
-            /* Copy the part we care about. */
-            for (uint32_t i = firstIndex; i <= lastIndex; ++i) {
-                melFilterBank[bin].push_back(thisBin[i]);
-            }
-        }
-
-        return melFilterBank;
-    }
-
-} /* namespace audio */
-} /* namespace app */
-} /* namespace arm */