':param text: A string to parse quality from'

def __init__(self, text=u''):

    self.text = text
    self.clean_text = text
    if text:
        self.parse(text)
    else:
        self.resolution = _UNKNOWNS[u'resolution']
        self.source = _UNKNOWNS[u'source']
        self.codec = _UNKNOWNS[u'codec']
        self.audio = _UNKNOWNS[u'audio']
