#youtube_dl/extractor/youtube.py: Signature decryption invoking js/swf sig parsers
#ln=
        if player_type == 'js':
            code = self._download_webpage(
                player_url, video_id,
                note=download_note,
                errnote='Download of %s failed' % player_url)
            res = self._parse_sig_js(code)
        elif player_type == 'swf':
            urlh = self._request_webpage(
                player_url, video_id,
                note=download_note,
                errnote='Download of %s failed' % player_url)
            code = urlh.read()
            res = self._parse_sig_swf(code)