Method MfccComputeQuant

samples/common/include/Audio/MFCC.hpp:81–106

    **/
    template<typename T>
    std::vector<T> MfccComputeQuant(const std::vector<float>& audioData,
                                    const float quantScale,
                                    const int quantOffset)
    {
        this->MfccComputePreFeature(audioData);
        float minVal = std::numeric_limits<T>::min();
        float maxVal = std::numeric_limits<T>::max();

        std::vector<T> mfccOut(this->m_params.m_numMfccFeatures);
        const size_t numFbankBins = this->m_params.m_numFbankBins;

        /* Take DCT. Uses matrix mul. */
        for (size_t i = 0, j = 0; i < mfccOut.size(); ++i, j += numFbankBins)
        {
            float sum = 0;
            for (size_t k = 0; k < numFbankBins; ++k)
            {
                sum += this->m_dctMatrix[j + k] * this->m_melEnergies[k];
            }
            /* Quantize to T. */
            sum = std::round((sum / quantScale) + quantOffset);
            mfccOut[i] = static_cast<T>(std::min<float>(std::max<float>(sum, minVal), maxVal));
        }

        return mfccOut;
    }

    MfccParams m_params;