void(* v_loop_filter)(uint8_t *src, ptrdiff_t stride, int *bounding_values)
void(* h_loop_filter)(uint8_t *src, ptrdiff_t stride, int *bounding_values)
void(* idct_dc_add)(uint8_t *dest, ptrdiff_t stride, int16_t *block)
void(* idct_put)(uint8_t *dest, ptrdiff_t stride, int16_t *block)
void(* idct_add)(uint8_t *dest, ptrdiff_t stride, int16_t *block)