void FFTLib::Compute(FFTFrame &frame) {
av_rdft_calc(m_rdft_ctx, m_input);
auto input = m_input;
auto output = frame.begin();
output[0] = input[0] * input[0];
output[m_frame_size / 2] = input[1] * input[1];
output += 1;
input += 2;
for (size_t i = 1; i < m_frame_size / 2; i++) {
*output++ = input[0] * input[0] + input[1] * input[1];
input += 2;
}
}
