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 09e739d..e4ff6ca 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;
 }