int avfilter_graph_parse(AVFilterGraph *graph, const char *filters, AVFilterInOut **open_inputs, AVFilterInOut **open_outputs, void *log_ctx) { int index = 0, ret; char chr = 0; AVFilterInOut *curr_inputs = NULL; do { AVFilterContext *filter; const char *filterchain = filters; filters += strspn(filters, WHITESPACES); if ((ret = parse_inputs(&filters, &curr_inputs, open_outputs, log_ctx)) < 0) goto fail; if ((ret = parse_filter(&filter, &filters, graph, index, log_ctx)) < 0) goto fail; if (filter->input_count == 1 && !curr_inputs && !index) { /* First input can be omitted if it is "[in]" */ const char *tmp = "[in]"; if ((ret = parse_inputs(&tmp, &curr_inputs, open_outputs, log_ctx)) < 0) goto fail; } if ((ret = link_filter_inouts(filter, &curr_inputs, open_inputs, log_ctx)) < 0) goto fail; if ((ret = parse_outputs(&filters, &curr_inputs, open_inputs, open_outputs, log_ctx)) < 0) goto fail; filters += strspn(filters, WHITESPACES); chr = *filters++; if (chr == ';' && curr_inputs) { av_log(log_ctx, AV_LOG_ERROR, "Invalid filterchain containing an unlabelled output pad: \"%s\"\n", filterchain); ret = AVERROR(EINVAL); goto fail; } index++; } while (chr == ',' || chr == ';'); if (chr) { av_log(log_ctx, AV_LOG_ERROR, "Unable to parse graph description substring: \"%s\"\n", filters - 1); ret = AVERROR(EINVAL); goto fail; } if (*open_inputs && !strcmp((*open_inputs)->name, "out") && curr_inputs) { /* Last output can be omitted if it is "[out]" */ const char *tmp = "[out]"; if ((ret = parse_outputs(&tmp, &curr_inputs, open_inputs, open_outputs, log_ctx)) < 0) goto fail; } return 0; fail: for (; graph->filter_count > 0; graph->filter_count--) avfilter_free(graph->filters[graph->filter_count - 1]); av_freep(&graph->filters); avfilter_inout_free(open_inputs); avfilter_inout_free(open_outputs); avfilter_inout_free(&curr_inputs); return ret; }