+default_ns = 'http://www.w3.org/2005/SMIL21/Language'
+_x = lambda p: xpath_with_ns(p, {'smil': default_ns})
+
+
+class ThePlatformBaseIE(OnceIE):
+ def _extract_theplatform_smil(self, smil_url, video_id, note='Downloading SMIL data'):
+ meta = self._download_xml(smil_url, video_id, note=note, query={'format': 'SMIL'})
+ error_element = find_xpath_attr(meta, _x('.//smil:ref'), 'src')
+ if error_element is not None and error_element.attrib['src'].startswith(
+ 'http://link.theplatform.com/s/errorFiles/Unavailable.'):
+ raise ExtractorError(error_element.attrib['abstract'], expected=True)
+
+ smil_formats = self._parse_smil_formats(
+ meta, smil_url, video_id, namespace=default_ns,
+ # the parameters are from syfy.com, other sites may use others,
+ # they also work for nbc.com
+ f4m_params={'g': 'UXWGVKRWHFSP', 'hdcore': '3.0.3'},
+ transform_rtmp_url=lambda streamer, src: (streamer, 'mp4:' + src))
+
+ formats = []
+ for _format in smil_formats:
+ if OnceIE.suitable(_format['url']):
+ formats.extend(self._extract_once_formats(_format['url']))
+ else:
+ media_url = _format['url']
+ if determine_ext(media_url) == 'm3u8':
+ hdnea2 = self._get_cookies(media_url).get('hdnea2')
+ if hdnea2:
+ _format['url'] = update_url_query(media_url, {'hdnea3': hdnea2.value})
+
+ formats.append(_format)
+
+ subtitles = self._parse_smil_subtitles(meta, default_ns)