s->dest[0]+= 16; s->dest[1]+= 8; s->dest[2]+= 8;
static inline void ff_update_block_index(MpegEncContext *s){    s->block_index[0]+=2;    s->block_index[1]+=2;    s->block_index[2]+=2;    s->block_index[3]+=2;    s->block_index[4]++;    s->block_index[5]++;}