control/media_descriptor: Implement libvlc_media_descriptor_get_mrl.

include/vlc/libvlc.h

@@ -147,6 +147,9 @@ VLC_PUBLIC_API void libvlc_media_descriptor_retain(
 VLC_PUBLIC_API void libvlc_media_descriptor_release(
                                    libvlc_media_descriptor_t *p_meta_desc );
 
+VLC_PUBLIC_API char * libvlc_media_descriptor_get_mrl( libvlc_media_descriptor_t * p_md,
+                                                       libvlc_exception_t * p_e );
+
 /**
  * Read the meta of the media descriptor.
  * \param p_meta_desc the media descriptor to read

src/control/media_descriptor.c

@@ -149,6 +149,17 @@ libvlc_media_descriptor_duplicate( libvlc_media_descriptor_t *p_md_orig )
     return p_md;
 }
 
+/**************************************************************************
+ * Retain a media descriptor object
+ **************************************************************************/
+char *
+libvlc_media_descriptor_get_mrl( libvlc_media_descriptor_t * p_md,
+                                 libvlc_exception_t * p_e )
+{
+    (void)p_e;
+    return strdup( p_md->p_input_item->psz_uri );
+}
+
 /**************************************************************************
  * Getter for meta information
  **************************************************************************/