void ff_h264_direct_ref_list_init(const H264Context *const h, H264SliceContext *sl) { H264Ref *const ref1 = &sl->ref_list[1][0]; H264Picture *const cur = h->cur_pic_ptr; int list, j, field; int sidx = (h->picture_structure & 1) ^ 1; int ref1sidx = (ref1->reference & 1) ^ 1; for (list = 0; list < sl->list_count; list++) { cur->ref_count[sidx][list] = sl->ref_count[list]; for (j = 0; j < sl->ref_count[list]; j++) cur->ref_poc[sidx][list][j] = 4 * sl->ref_list[list][j].parent->frame_num + (sl->ref_list[list][j].reference & 3); } if (h->picture_structure == PICT_FRAME) { memcpy(cur->ref_count[1], cur->ref_count[0], sizeof(cur->ref_count[0])); memcpy(cur->ref_poc[1], cur->ref_poc[0], sizeof(cur->ref_poc[0])); } cur->mbaff = FRAME_MBAFF(h); sl->col_fieldoff = 0; if (sl->list_count != 2 || !sl->ref_count[1]) return; if (h->picture_structure == PICT_FRAME) { int cur_poc = h->cur_pic_ptr->poc; int *col_poc = sl->ref_list[1][0].parent->field_poc; if (col_poc[0] == INT_MAX && col_poc[1] == INT_MAX) { av_log(h->avctx, AV_LOG_ERROR, "co located POCs unavailable\n"); sl->col_parity = 1; } else sl->col_parity = (FFABS(col_poc[0] - cur_poc) >= FFABS(col_poc[1] - cur_poc)); ref1sidx = sidx = sl->col_parity; // FL -> FL & differ parity } else if (!(h->picture_structure & sl->ref_list[1][0].reference) && !sl->ref_list[1][0].parent->mbaff) { sl->col_fieldoff = 2 * sl->ref_list[1][0].reference - 3; } if (sl->slice_type_nos != AV_PICTURE_TYPE_B || sl->direct_spatial_mv_pred) return; for (list = 0; list < 2; list++) { fill_colmap(h, sl, sl->map_col_to_list0, list, sidx, ref1sidx, 0); if (FRAME_MBAFF(h)) for (field = 0; field < 2; field++) fill_colmap(h, sl, sl->map_col_to_list0_field[field], list, field, field, 1); } }