B2                 42 libavcodec/faandct.c #define B2 0.765366864730179543456919968060797734 // (cos(pi*2/16)sqrt(2))^-1
B2                 29 libavcodec/faanidct.c #define B2 1.3065629648763765278566 // cos(pi*2/16)sqrt(2)