PI               1216 libswscale/swscale.c                         c = cos(floatd*PI);
PI               1238 libswscale/swscale.c                     coeff = (d ? sin(floatd*PI)/(floatd*PI) : 1.0)*fone;
PI               1243 libswscale/swscale.c                     coeff = (d ? sin(floatd*PI)*sin(floatd*PI/p)/(floatd*floatd*PI*PI/p) : 1.0)*fone;
PI               2900 libswscale/swscale.c         coeff[i]= exp(-dist*dist/(2*variance*variance)) / sqrt(2*variance*PI);