int ff_h264_decode_ref_pic_list_reordering(H264Context *h) { int list, index, pic_structure, i; print_short_term(h); print_long_term(h); for (list = 0; list < h->list_count; list++) { for (i = 0; i < h->ref_count[list]; i++) COPY_PICTURE(&h->ref_list[list][i], &h->default_ref_list[list][i]); if (get_bits1(&h->gb)) { int pred = h->curr_pic_num; for (index = 0; ; index++) { unsigned int reordering_of_pic_nums_idc = get_ue_golomb_31(&h->gb); unsigned int pic_id; int i; Picture *ref = NULL; if (reordering_of_pic_nums_idc == 3) break; if (index >= h->ref_count[list]) { av_log(h->avctx, AV_LOG_ERROR, "reference count overflow\n"); return -1; } if (reordering_of_pic_nums_idc < 3) { if (reordering_of_pic_nums_idc < 2) { const unsigned int abs_diff_pic_num = get_ue_golomb(&h->gb) + 1; int frame_num; if (abs_diff_pic_num > h->max_pic_num) { av_log(h->avctx, AV_LOG_ERROR, "abs_diff_pic_num overflow\n"); return -1; } if (reordering_of_pic_nums_idc == 0) pred -= abs_diff_pic_num; else pred += abs_diff_pic_num; pred &= h->max_pic_num - 1; frame_num = pic_num_extract(h, pred, &pic_structure); for (i = h->short_ref_count - 1; i >= 0; i--) { ref = h->short_ref[i]; assert(ref->reference); assert(!ref->long_ref); if (ref->frame_num == frame_num && (ref->reference & pic_structure)) break; } if (i >= 0) ref->pic_id = pred; } else { int long_idx; pic_id = get_ue_golomb(&h->gb); //long_term_pic_idx long_idx = pic_num_extract(h, pic_id, &pic_structure); if (long_idx > 31) { av_log(h->avctx, AV_LOG_ERROR, "long_term_pic_idx overflow\n"); return -1; } ref = h->long_ref[long_idx]; assert(!(ref && !ref->reference)); if (ref && (ref->reference & pic_structure)) { ref->pic_id = pic_id; assert(ref->long_ref); i = 0; } else { i = -1; } } if (i < 0) { av_log(h->avctx, AV_LOG_ERROR, "reference picture missing during reorder\n"); memset(&h->ref_list[list][index], 0, sizeof(Picture)); //FIXME } else { for (i = index; i + 1 < h->ref_count[list]; i++) { if (ref->long_ref == h->ref_list[list][i].long_ref && ref->pic_id == h->ref_list[list][i].pic_id) break; } for (; i > index; i--) { COPY_PICTURE(&h->ref_list[list][i], &h->ref_list[list][i - 1]); } COPY_PICTURE(&h->ref_list[list][index], ref); if (FIELD_PICTURE(h)) { pic_as_field(&h->ref_list[list][index], pic_structure); } } } else { av_log(h->avctx, AV_LOG_ERROR, "illegal reordering_of_pic_nums_idc\n"); return -1; } } } } for (list = 0; list < h->list_count; list++) { for (index = 0; index < h->ref_count[list]; index++) { if (!h->ref_list[list][index].f.data[0]) { av_log(h->avctx, AV_LOG_ERROR, "Missing reference picture\n"); if (h->default_ref_list[list][0].f.data[0]) COPY_PICTURE(&h->ref_list[list][index], &h->default_ref_list[list][0]); else return -1; } } } return 0; }