int avfilter_parse_graph(AVFilterGraph *graph, const char *filters, AVFilterInOut *open_inputs, AVFilterInOut *open_outputs, AVClass *log_ctx) { int index = 0; char chr = 0; AVFilterInOut *curr_inputs = NULL; do { AVFilterContext *filter; filters += consume_whitespace(filters); if(parse_inputs(&filters, &curr_inputs, &open_outputs, log_ctx) < 0) goto fail; filter = parse_filter(&filters, graph, index, log_ctx); if(!filter) goto fail; if(filter->input_count == 1 && !curr_inputs && !index) { /* First input can be omitted if it is "[in]" */ const char *tmp = "[in]"; if(parse_inputs(&tmp, &curr_inputs, &open_outputs, log_ctx) < 0) goto fail; } if(link_filter_inouts(filter, &curr_inputs, &open_inputs, log_ctx) < 0) goto fail; if(parse_outputs(&filters, &curr_inputs, &open_inputs, &open_outputs, log_ctx) < 0) goto fail; filters += consume_whitespace(filters); 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); goto fail; } index++; } while(chr == ',' || chr == ';'); if (*filters) { av_log(log_ctx, AV_LOG_ERROR, "Unable to parse graph description substring: \"%s\"\n", filters - 1); 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(parse_outputs(&tmp, &curr_inputs, &open_inputs, &open_outputs, log_ctx) < 0) goto fail; } return 0; fail: avfilter_destroy_graph(graph); free_inout(open_inputs); free_inout(open_outputs); free_inout(curr_inputs); return -1; }