lavfi: add avfilter_unref_bufferp()

Signed-off-by: Stefano Sabatini <stefasab@gmail.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/libavfilter/avfilter.h b/libavfilter/avfilter.h
index 9c7a2e5bbf..fef348d8cc 100644
--- a/libavfilter/avfilter.h
+++ b/libavfilter/avfilter.h
@@ -188,6 +188,15 @@ AVFilterBufferRef *avfilter_ref_buffer(AVFilterBufferRef *ref, int pmask);
 void avfilter_unref_buffer(AVFilterBufferRef *ref);
 
 /**
+ * Remove a reference to a buffer and set the pointer to NULL.
+ * If this is the last reference to the buffer, the buffer itself
+ * is also automatically freed.
+ *
+ * @param ref pointer to the buffer reference
+ */
+void avfilter_unref_bufferp(AVFilterBufferRef **ref);
+
+/**
  * A list of supported formats for one end of a filter link. This is used
  * during the format negotiation process to try to pick the best format to
  * use to minimize the number of necessary conversions. Each filter gives a