684     Avs2dFrame_t *p_cur, *p;  in dpb_set_frame_refs()  local
692     p_cur = mgr->cur_frm;  in dpb_set_frame_refs()
698         doi_of_ref = p_cur->doi - p_rps->ref_pic[i];  in dpb_set_frame_refs()
712     if (mgr->num_of_ref < 1 && !p_cur->intra_frame_flag) {  in dpb_set_frame_refs()
714     } else if (p_cur->picture_type == S_PICTURE) {  in dpb_set_frame_refs()
715         p_cur->refered_bg_frame = 1;  in dpb_set_frame_refs()
724     } else if ((p_cur->picture_type == P_PICTURE || p_cur->picture_type == F_PICTURE) &&  in dpb_set_frame_refs()
726         p_cur->refered_bg_frame = 1;  in dpb_set_frame_refs()
733     } else if (p_cur->picture_type == B_PICTURE &&  in dpb_set_frame_refs()
734                (mgr->num_of_ref != 2 || (mgr->refs[0] && mgr->refs[0]->poi <= p_cur->poi) ||  in dpb_set_frame_refs()
735                 (mgr->refs[1] && mgr->refs[1]->poi >= p_cur->poi))) {  in dpb_set_frame_refs()
748         mpp_frame_set_errinfo(p_cur->frame, MPP_FRAME_ERR_UNKNOW);  in dpb_set_frame_refs()
749         AVS2D_DBG(AVS2D_DBG_ERROR, "Error reference frame for picture(%d).\n", p_cur->picture_type);  in dpb_set_frame_refs()