BITS_INV_ACC       32 libavcodec/ps2/idct_mmi.c #define BITS_INV_ACC    5       // 4 or 5 for IEEE
BITS_INV_ACC       49 libavcodec/x86/idct_mmx_xvid.c #define BITS_INV_ACC    5                              // 4 or 5 for IEEE