fix15             100 libavcodec/ac3enc.c         costab[i] = fix15(cos(alpha));
fix15             101 libavcodec/ac3enc.c         sintab[i] = fix15(sin(alpha));
fix15             698 libavcodec/ac3enc.c         xcos1[i] = fix15(-cos(alpha));
fix15             699 libavcodec/ac3enc.c         xsin1[i] = fix15(-sin(alpha));