BITS_INV_ACC       28 libavcodec/mips/xvid_idct_mmi.c #define SHIFT_INV_ROW   (16 - BITS_INV_ACC)         //11
BITS_INV_ACC       29 libavcodec/mips/xvid_idct_mmi.c #define SHIFT_INV_COL   (1 + BITS_INV_ACC)          //6
BITS_INV_ACC       30 libavcodec/mips/xvid_idct_mmi.c #define RND_INV_ROW     (1024 * (6 - BITS_INV_ACC))
BITS_INV_ACC       31 libavcodec/mips/xvid_idct_mmi.c #define RND_INV_COL     (16 * (BITS_INV_ACC - 3))