diff --git a/libavfilter/buffersrc.c b/libavfilter/buffersrc.c
index 305d1c49d6..7cc80d8f5f 100644
--- a/libavfilter/buffersrc.c
+++ b/libavfilter/buffersrc.c
@@ -138,7 +138,7 @@ int av_buffersrc_write_frame(AVFilterContext *buffer_filter, AVFrame *frame)
     return 0;
 }
 
-static int av_buffersrc_buffer(AVFilterContext *s, AVFilterBufferRef *buf)
+int av_buffersrc_buffer(AVFilterContext *s, AVFilterBufferRef *buf)
 {
     BufferSourceContext *c = s->priv;
     int ret;
diff --git a/libavfilter/buffersrc.h b/libavfilter/buffersrc.h
index 25e2fbf6dc..cd6492e5cb 100644
--- a/libavfilter/buffersrc.h
+++ b/libavfilter/buffersrc.h
@@ -62,6 +62,15 @@ int av_buffersrc_add_ref(AVFilterContext *buffer_src,
  */
 unsigned av_buffersrc_get_nb_failed_requests(AVFilterContext *buffer_src);
 
+/**
+ * Add a buffer to the filtergraph s.
+ *
+ * @param buf buffer containing frame data to be passed down the filtergraph.
+ * This function will take ownership of buf, the user must not free it.
+ * A NULL buf signals EOF -- i.e. no more frames will be sent to this filter.
+ */
+int av_buffersrc_buffer(AVFilterContext *s, AVFilterBufferRef *buf);
+
 /**
  * Add a frame to the buffer source.
  *