Implement avfilter_graph_config_links().

Originally committed as revision 19066 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavfilter/avfiltergraph.c

@@ -77,6 +77,23 @@ int avfilter_graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
     return 0;
 }
 
+int avfilter_graph_config_links(AVFilterGraph *graph, AVClass *log_ctx)
+{
+    AVFilterContext *filt;
+    int i, ret;
+
+    for (i=0; i < graph->filter_count; i++) {
+        filt = graph->filters[i];
+
+        if (!filt->output_count) {
+            if ((ret = avfilter_config_links(filt)))
+                return ret;
+        }
+    }
+
+    return 0;
+}
+
 AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, char *name)
 {
     int i;

libavfilter/avfiltergraph.h

@@ -56,6 +56,13 @@ int avfilter_graph_add_filter(AVFilterGraph *graphctx, AVFilterContext *filter);
  */
 int avfilter_graph_check_validity(AVFilterGraph *graphctx, AVClass *log_ctx);
 
+/**
+ * Configures all the links of graphctx.
+ *
+ * @return 0 in case of success, a negative value otherwise
+ */
+int avfilter_graph_config_links(AVFilterGraph *graphctx, AVClass *log_ctx);
+
 /**
  * Configures the formats of all the links in the graph.
  */