A4                 31 libavcodec/eaidct.c #define A4    669 /* cos(pi/8)*sqrt(2)<<9 */
A4                 57 libavcodec/faandct.c #define A4 1.30656296487637652774 // cos(pi*2/16)sqrt(2)
A4                 35 libavcodec/faanidct.c #define A4 0.70710678118654752438 // cos(pi*4/16)