From 39dbbf1369a0edeeacb5ba1624d2b419bfb98b35 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20Dr=C3=B6ge?= <sebastian@centricular.com>
Date: Tue, 18 Aug 2020 10:26:48 +0300
Subject: [PATCH] videoscale: Don't call NULL GstMeta transform function

It's optional and if it does not exist then no transformation is
possible.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/790>
---
 gst/videoscale/gstvideoscale.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/gst/videoscale/gstvideoscale.c b/gst/videoscale/gstvideoscale.c
index 0a67b44a95..198a767747 100644
--- a/gst/videoscale/gstvideoscale.c
+++ b/gst/videoscale/gstvideoscale.c
@@ -543,7 +543,9 @@ gst_video_scale_transform_meta (GstBaseTransform * trans, GstBuffer * inbuf,
     GstVideoMetaTransform trans =
         { &videofilter->in_info, &videofilter->out_info };
 
-    return info->transform_func (outbuf, meta, inbuf, _scale_quark, &trans);
+    if (info->transform_func)
+      return info->transform_func (outbuf, meta, inbuf, _scale_quark, &trans);
+    return FALSE;
   }
 
   /* No need to transform, we can safely copy this meta */