func: static void idr(H264Context *h){
  
      int i;
  
      ff_h264_remove_all_refs(h);
  
      h->prev_frame_num= -1;
  
      h->prev_frame_num_offset= 0;
  
      h->prev_poc_msb= 1<<16;
  
      h->prev_poc_lsb= 0;
  
      for (i = 0; i < MAX_DELAYED_PIC_COUNT; i++)
  
          h->last_pocs[i] = INT_MIN;
  
  }
  