B1                 41 libavcodec/faandct.c #define B1 0.720959822006947913789091890943021267 // (cos(pi*1/16)sqrt(2))^-1
B1                 28 libavcodec/faanidct.c #define B1 1.3870398453221474618216 // cos(pi*1/16)sqrt(2)