lavfi: add avfilter_unref_bufferp()

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

3 files changed, 16 insertions, 1 deletions

diff --git a/libavfilter/avfilter.c b/libavfilter/avfilter.c
index 141fb9d7ca..28c2599d0e 100644
--- a/libavfilter/avfilter.c
+++ b/libavfilter/avfilter.c
@@ -160,6 +160,12 @@ void avfilter_unref_buffer(AVFilterBufferRef *ref)
     av_free(ref);
 }
 
+void avfilter_unref_bufferp(AVFilterBufferRef **ref)
+{
+    avfilter_unref_buffer(*ref);
+    *ref = NULL;
+}
+
 void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
                          AVFilterPad **pads, AVFilterLink ***links,
                          AVFilterPad *newpad)
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
diff --git a/libavfilter/version.h b/libavfilter/version.h
index e8e9f27566..9f53651b17 100644
--- a/libavfilter/version.h
+++ b/libavfilter/version.h
@@ -29,7 +29,7 @@
 #include "libavutil/avutil.h"
 
 #define LIBAVFILTER_VERSION_MAJOR  2
-#define LIBAVFILTER_VERSION_MINOR 70
+#define LIBAVFILTER_VERSION_MINOR 71
 #define LIBAVFILTER_VERSION_MICRO 100
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \