ff_idct_add (dest, line_size, block);
s->idct_add (dest, line_size, block);
static inline void add_dct(MpegEncContext *s,                            DCTELEM *block, int i, UINT8 *dest, int line_size){    if (s->block_last_index[i] >= 0) {        ff_idct_add (dest, line_size, block);    }}