'Immediately begin playing the audio file at the given
path.'

def play_file(self, path):

    self.player.set_state(Gst.State.NULL)
    if isinstance(path, six.text_type):
        path = path.encode('utf-8')
    uri = ('file://' + urllib.parse.quote(path))
    self.player.set_property('uri', uri)
    self.player.set_state(Gst.State.PLAYING)
    self.playing = True
