Method computeInverseFFT

src/internal/src/FFTFrameKissFFT.cpp:105–125

}

void FFTFrame::computeInverseFFT(float * data)
{
    const uint32_t inputSize = m_FFTSize / 2 + 1;

    for (uint32_t i = 0; i < inputSize; ++i)
    {
        m_cpxInputData[i].r = m_realData.data()[i];
        m_cpxInputData[i].i = m_imagData.data()[i];
    }

    // Inverse-transform the (inputSize) points of data in each
    // of (m_cpxInputData.r) and (m_cpxInputData.i)
    float * outData = reinterpret_cast<float *>(m_cpxOutputData);  // .r + .i
    kiss_fftri(mIFFT, m_cpxInputData, outData);

    // Scale so that a forward then inverse FFT yields exactly the original data and
    // store the resulting (m_FFTSize) points in (data).
    //  x == IFFT(FFT(x))
    const float scale = 1.0f / m_FFTSize;
    VectorMath::vsmul(outData, 1, &scale, data, 1, m_FFTSize);
}

float * FFTFrame::realData() const
{