RDFT               52 libavcodec/rdft.c     const double theta = (trans == RDFT || trans == IRIDFT ? -1 : 1)*2*M_PI/n;
RDFT               65 libavcodec/rdft.c     s->tsin = ff_sin_tabs[nbits-4]+(trans == RDFT || trans == IRIDFT)*(n>>2);