videoscale: fix adding borders when NV12 is used

When the frame buffer is NV12 the borders are not added at all, fix that
and fill them to black.

https://bugzilla.gnome.org/show_bug.cgi?id=711003

diff --git a/gst/videoscale/gstvideoscale.c b/gst/videoscale/gstvideoscale.c
index 0f2eada..e752931 100644 (file)
--- a/gst/videoscale/gstvideoscale.c
+++ b/gst/videoscale/gstvideoscale.c
@@ -1378,6 +1378,10 @@ do_scale (GstVideoFilter * filter, VSImage dest[4], VSImage src[4])
       }
       break;
     case GST_VIDEO_FORMAT_NV12:
+      if (add_borders) {
+        vs_fill_borders_Y (&dest[0], black);
+        vs_fill_borders_Y16 (&dest[1], (black[1] << 8) | black[2]);
+      }
       switch (method) {
         case GST_VIDEO_SCALE_NEAREST:
           vs_image_scale_nearest_Y (&dest[0], &src[0], videoscale->tmp_buf);