glcolorconvert: Use base transform metadata copy

Use base class default method instead of only copying flags and
timestamp. This way, selected meta's like compostion overlay will
be passed downstream as expected.

https://bugzilla.gnome.org/show_bug.cgi?id=754047

diff --git a/ext/gl/gstglcolorconvertelement.c b/ext/gl/gstglcolorconvertelement.c
index 09e739d871e9ab7464682f26c5c2435d089ad505..e4ff6ca34bb8e7670f70c882ecc052d3c21c6e8e 100644 (file)
--- a/ext/gl/gstglcolorconvertelement.c
+++ b/ext/gl/gstglcolorconvertelement.c
@@ -201,6 +201,9 @@ gst_gl_color_convert_element_prepare_output_buffer (GstBaseTransform * bt,
     GstBuffer * inbuf, GstBuffer ** outbuf)
 {
   GstGLColorConvertElement *convert = GST_GL_COLOR_CONVERT_ELEMENT (bt);
+  GstBaseTransformClass *bclass;
+
+  bclass = GST_BASE_TRANSFORM_GET_CLASS (bt);
 
   if (gst_base_transform_is_passthrough (bt)) {
     *outbuf = inbuf;
@@ -220,8 +223,8 @@ gst_gl_color_convert_element_prepare_output_buffer (GstBaseTransform * bt,
   /* basetransform doesn't unref if they're the same */
   if (inbuf == *outbuf)
     gst_buffer_unref (*outbuf);
-  gst_buffer_copy_into (*outbuf, inbuf,
-      GST_BUFFER_COPY_FLAGS | GST_BUFFER_COPY_TIMESTAMPS, 0, -1);
+  else
+    bclass->copy_metadata (bt, inbuf, *outbuf);
 
   return GST_FLOW_OK;
 }