Add new namespace of pffft to make the upgrade work

                << "The input(buffer) size must be greater than or equal to nPointFFT";

        bufferMag.resize(binOffsets.size());

        std::vector<float> fftInput(nPointFFT);

        PFFFT_Setup* inputHandle = pffft_new_setup(nPointFFT, PFFFT_REAL);

        pffft::detail::PFFFT_Setup* inputHandle =

                pffft_new_setup(nPointFFT, pffft::detail::PFFFT_REAL);

        pffft_transform_ordered(inputHandle, buffer.data(), fftInput.data(), nullptr,

                                PFFFT_FORWARD);

                                pffft::detail::PFFFT_FORWARD);

        pffft_destroy_setup(inputHandle);

        for (size_t i = 0; i < binOffsets.size(); i++) {

            size_t k = binOffsets[i];