lavfi: add avfilter_default_filter_name()

The function is modelled after av_default_item_name(), and will print the
name of the instance filter if defined, otherwise the name of the filter.

This allows to show the instance name in the log, which is useful when
debugging complex filter graphs.

1 files changed, 1 insertions, 6 deletions

diff --git a/libavfilter/asrc_anullsrc.c b/libavfilter/asrc_anullsrc.c
index 61fdc3241e..6cd49e60fe 100644
--- a/libavfilter/asrc_anullsrc.c
+++ b/libavfilter/asrc_anullsrc.c
@@ -53,14 +53,9 @@ static const AVOption anullsrc_options[]= {
     { NULL },
 };
 
-static const char *anullsrc_get_name(void *ctx)
-{
-    return "anullsrc";
-}
-
 static const AVClass anullsrc_class = {
     "ANullSrcContext",
-    anullsrc_get_name,
+    avfilter_default_filter_name,
     anullsrc_options
 };