int avfilter_graph_parse(AVFilterGraph *graph, const char *filters, AVFilterInOut *open_inputs, AVFilterInOut *open_outputs, AVClass *log_ctx) { int index = 0, ret; char chr = 0; AVFilterInOut *curr_inputs = NULL; do { AVFilterContext *filter; 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, "Could not find a output to link when parsing \"%s\"\n", filters - 1); 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: avfilter_graph_free(graph); free_inout(open_inputs); free_inout(open_outputs); free_inout(curr_inputs); return ret; }