avfiltergraph: make the AVFilterInOut alloc/free API public

This is required for letting applications to create and destroy
AVFilterInOut structs in a convenient way.

1 files changed, 16 insertions, 2 deletions

diff --git a/libavfilter/avfiltergraph.h b/libavfilter/avfiltergraph.h
index 538fd2cb95..a975926fd1 100644
--- a/libavfilter/avfiltergraph.h
+++ b/libavfilter/avfiltergraph.h
@@ -108,14 +108,28 @@ typedef struct AVFilterInOut {
 } AVFilterInOut;
 
 /**
+ * Create an AVFilterInOut.
+ * Must be free with avfilter_inout_free().
+ */
+AVFilterInOut *avfilter_inout_alloc(void);
+
+/**
+ * Free the AVFilterInOut in *inout, and set its pointer to NULL.
+ * If *inout is NULL, do nothing.
+ */
+void avfilter_inout_free(AVFilterInOut **inout);
+
+/**
  * Add a graph described by a string to a graph.
  *
  * @param graph   the filter graph where to link the parsed graph context
  * @param filters string to be parsed
  * @param inputs  linked list to the inputs of the graph, may be NULL.
- *                It is updated to contain the list of open inputs after the parsing.
+ *                It is updated to contain the list of open inputs after the parsing,
+ *                should be freed with avfilter_inout_free().
  * @param outputs linked list to the outputs of the graph, may be NULL.
- *                It is updated to contain the list of open outputs after the parsing.
+ *                It is updated to contain the list of open outputs after the parsing,
+ *                should be freed with avfilter_inout_free().
  * @return zero on success, a negative AVERROR code on error
  */
 int avfilter_graph_parse(AVFilterGraph *graph, const char *filters,