Q31               291 libavcodec/fft_template.c         accu = (int64_t)Q31(M_SQRT1_2)*(tmp1 + tmp2);
Q31               293 libavcodec/fft_template.c         accu = (int64_t)Q31(M_SQRT1_2)*(tmp3 - tmp4);
Q31               295 libavcodec/fft_template.c         accu = (int64_t)Q31(M_SQRT1_2)*(tmp2 - tmp1);
Q31               297 libavcodec/fft_template.c         accu = (int64_t)Q31(M_SQRT1_2)*(tmp3 + tmp4);