filename_to_uri
Description:
Similar to to_uri, but attempts to handle relative file paths as well.
 Before converting filename into an URI, it will be prefixed by the current working directory if it is a relative path, and then 
      the path will be canonicalised so that it doesn't contain any './' or '../' segments.
On Windows filename should be in UTF-8 encoding.
Parameters:
| filename | absolute or relative file name path | 
Returns:
| newly-allocated URI string, or NULL on error. The caller must free the URI string with g_free when no longer needed. | 
Namespace: Gst
  
  Package: gstreamer-1.0