Add teletext transparency functions

src/main/java/uk/co/caprica/vlcj/player/base/TeletextApi.java

@@ -20,7 +20,9 @@
 package uk.co.caprica.vlcj.player.base;
 
 import static uk.co.caprica.vlcj.binding.lib.LibVlc.libvlc_video_get_teletext;
+import static uk.co.caprica.vlcj.binding.lib.LibVlc.libvlc_video_get_teletext_transparency;
 import static uk.co.caprica.vlcj.binding.lib.LibVlc.libvlc_video_set_teletext;
+import static uk.co.caprica.vlcj.binding.lib.LibVlc.libvlc_video_set_teletext_transparency;
 
 /**
  * Behaviour pertaining to teletext.
@@ -58,4 +60,21 @@ public void setKey(TeletextKey key) {
         libvlc_video_set_teletext(mediaPlayerInstance, key.intValue());
     }
 
+    /**
+     * Set whether the teletext background should be transparent.
+     *
+     * @param transparent <code>true</code> for transparent background, otherwise <code>false</code>
+     */
+    public void setTransparency(boolean transparent) {
+        libvlc_video_set_teletext_transparency(mediaPlayerInstance, transparent ? 1 : 0);
+    }
+
+    /**
+     * Get whether the teletext background is transparent.
+     *
+     * @return <code>true</code> if background transparent, otherwise <code>false</code>
+     */
+    public boolean getTransparency() {
+        return libvlc_video_get_teletext_transparency(mediaPlayerInstance) == 1;
+    }
 }