func: static int get_pcm(HEVCContext *s, int x, int y)
  
  {
  
      int log2_min_pu_size = s->sps->log2_min_pu_size;
  
      int x_pu             = x >> log2_min_pu_size;
  
      int y_pu             = y >> log2_min_pu_size;
  
  
  
      if (x < 0 || x_pu >= s->sps->min_pu_width ||
  
          y < 0 || y_pu >= s->sps->min_pu_height)
  
          return 2;
  
      return s->is_pcm[y_pu * s->sps->min_pu_width + x_pu];
  
  }
  