text: # coding: utf-8
  from __future__ import unicode_literals
  
  import functools
  import re
  
  from .common import InfoExtractor
  from ..utils import (
      int_or_none,
      unified_strdate,
      OnDemandPagedList,
      xpath_text,
      determine_ext,
      qualities,
      float_or_none,
      ExtractorError,
  )
  
  
  class ZDFIE(InfoExtractor):
      _VALID_URL = r'(?:zdf:|zdf:video:|https?://www\.zdf\.de/ZDFmediathek(?:#)?/(.*beitrag/(?:video/)?))(?P<id>[0-9]+)(?:/[^/?]+)?(?:\?.*)?'
  
      _TESTS = [{
          'url': 'http://www.zdf.de/ZDFmediathek/beitrag/video/2037704/ZDFspezial---Ende-des-Machtpokers--?bc=sts;stt',
          'info_dict': {
              'id': '2037704',
              'ext': 'webm',
              'title': 'ZDFspezial - Ende des Machtpokers',
              'description': 'Union und SPD haben sich auf einen Koalitionsvertrag geeinigt. Aber was bedeutet das für die Bürger? Sehen Sie hierzu das ZDFspezial "Ende des Machtpokers - Große Koalition für Deutschland".',
              'duration': 1022,
              'uploader': 'spezial',
              'uploader_id': '225948',
              'upload_date': '20131127',
          },
          'skip': 'Videos on ZDF.de are depublicised in short order',
      }]
  
      def _parse_smil_formats(self, smil, smil_url, video_id, namespace=None, f4m_params=None, transform_rtmp_url=None):
          param_groups = {}
          for param_group in smil.findall(self._xpath_ns('./head/paramGroup', namespace)):
              group_id = param_group.attrib.get(self._xpath_ns('id', 'http://www.w3.org/XML/1998/namespace'))
              params = {}
              for param in param_group:
                  params[param.get('name')] = param.get('value')
              param_groups[group_id] = params
  
          formats = []
          for video in smil.findall(self._xpath_ns('.//video', namespace)):
              src = video.get('src')
              if not src:
                  continue
              bitrate = float_or_none(video.get('system-bitrate') or video.get('systemBitrate'), 1000)
              group_id = video.get('paramGroup')
              param_group = param_groups[group_id]
              for proto in param_group['protocols'].split(','):
                  formats.append({
                      'url': '%s://%s' % (proto, param_group['host']),
                      'app': param_group['app'],
                      'play_path': src,
                      'ext': 'flv',
                      'format_id': '%s-%d' % (proto, bitrate),
                      'tbr': bitrate,
                  })
          self._sort_formats(formats)
          return formats
  
      def extract_from_xml_url(self, video_id, xml_url):
          doc = self._download_xml(
              xml_url, video_id,
              note='Downloading video info',
              errnote='Failed to download video info')
  
          status_code = doc.find('./status/statuscode')
          if status_code is not None and status_code.text != 'ok':
              code = status_code.text
              if code == 'notVisibleAnymore':
                  message = 'Video %s is not available' % video_id
              else:
                  message = '%s returned error: %s' % (self.IE_NAME, code)
              raise ExtractorError(message, expected=True)
  
          title = doc.find('.//information/title').text
          description = xpath_text(doc, './/information/detail', 'description')
          duration = int_or_none(xpath_text(doc, './/details/lengthSec', 'duration'))
          uploader = xpath_text(doc, './/details/originChannelTitle', 'uploader')
          uploader_id = xpath_text(doc, './/details/originChannelId', 'uploader id')
          upload_date = unified_strdate(xpath_text(doc, './/details/airtime', 'upload date'))
          subtitles = {}
          captions_url = doc.find('.//caption/url')
          if captions_url is not None:
              subtitles['de'] = [{
                  'url': captions_url.text,
                  'ext': 'ttml',
              }]
  
          def xml_to_thumbnails(fnode):
              thumbnails = []
              for node in fnode:
                  thumbnail_url = node.text
                  if not thumbnail_url:
                      continue
                  thumbnail = {
                      'url': thumbnail_url,
                  }
                  if 'key' in node.attrib:
                      m = re.match('^([0-9]+)x([0-9]+)$', node.attrib['key'])
                      if m:
                          thumbnail['width'] = int(m.group(1))
                          thumbnail['height'] = int(m.group(2))
                  thumbnails.append(thumbnail)
              return thumbnails
  
          thumbnails = xml_to_thumbnails(doc.findall('.//teaserimages/teaserimage'))
  
          format_nodes = doc.findall('.//formitaeten/formitaet')
          quality = qualities(['veryhigh', 'high', 'med', 'low'])
  
          def get_quality(elem):
              return quality(xpath_text(elem, 'quality'))
          format_nodes.sort(key=get_quality)
          format_ids = []
          formats = []
          for fnode in format_nodes:
              video_url = fnode.find('url').text
              is_available = 'http://www.metafilegenerator' not in video_url
              if not is_available:
                  continue
              format_id = fnode.attrib['basetype']
              quality = xpath_text(fnode, './quality', 'quality')
              format_m = re.match(r'''(?x)
                  (?P<vcodec>[^_]+)_(?P<acodec>[^_]+)_(?P<container>[^_]+)_
                  (?P<proto>[^_]+)_(?P<index>[^_]+)_(?P<indexproto>[^_]+)
              ''', format_id)
  
              ext = determine_ext(video_url, None) or format_m.group('container')
              if ext not in ('smil', 'f4m', 'm3u8'):
                  format_id = format_id + '-' + quality
              if format_id in format_ids:
                  continue
  
              if ext == 'meta':
                  continue
              elif ext == 'smil':
                  formats.extend(self._extract_smil_formats(
                      video_url, video_id, fatal=False))
              elif ext == 'm3u8':
                  # the certificates are misconfigured (see
                  # https://github.com/rg3/youtube-dl/issues/8665)
                  if video_url.startswith('https://'):
                      continue
                  formats.extend(self._extract_m3u8_formats(
                      video_url, video_id, 'mp4', m3u8_id=format_id, fatal=False))
              elif ext == 'f4m':
                  formats.extend(self._extract_f4m_formats(
                      video_url, video_id, f4m_id=format_id, fatal=False))
              else:
                  proto = format_m.group('proto').lower()
  
                  abr = int_or_none(xpath_text(fnode, './audioBitrate', 'abr'), 1000)
                  vbr = int_or_none(xpath_text(fnode, './videoBitrate', 'vbr'), 1000)
  
                  width = int_or_none(xpath_text(fnode, './width', 'width'))
                  height = int_or_none(xpath_text(fnode, './height', 'height'))
  
                  filesize = int_or_none(xpath_text(fnode, './filesize', 'filesize'))
  
                  format_note = ''
                  if not format_note:
                      format_note = None
  
                  formats.append({
                      'format_id': format_id,
                      'url': video_url,
                      'ext': ext,
                      'acodec': format_m.group('acodec'),
                      'vcodec': format_m.group('vcodec'),
                      'abr': abr,
                      'vbr': vbr,
                      'width': width,
                      'height': height,
                      'filesize': filesize,
                      'format_note': format_note,
                      'protocol': proto,
                      '_available': is_available,
                  })
              format_ids.append(format_id)
  
          self._sort_formats(formats)
  
          return {
              'id': video_id,
              'title': title,
              'description': description,
              'duration': duration,
              'thumbnails': thumbnails,
              'uploader': uploader,
              'uploader_id': uploader_id,
              'upload_date': upload_date,
              'formats': formats,
              'subtitles': subtitles,
          }
  
      def _real_extract(self, url):
          video_id = self._match_id(url)
          xml_url = 'http://www.zdf.de/ZDFmediathek/xmlservice/web/beitragsDetails?ak=web&id=%s' % video_id
          return self.extract_from_xml_url(video_id, xml_url)
  
  
  class ZDFChannelIE(InfoExtractor):
      _VALID_URL = r'(?:zdf:topic:|https?://www\.zdf\.de/ZDFmediathek(?:#)?/.*kanaluebersicht/(?:[^/]+/)?)(?P<id>[0-9]+)'
      _TESTS = [{
          'url': 'http://www.zdf.de/ZDFmediathek#/kanaluebersicht/1586442/sendung/Titanic',
          'info_dict': {
              'id': '1586442',
          },
          'playlist_count': 3,
      }, {
          'url': 'http://www.zdf.de/ZDFmediathek/kanaluebersicht/aktuellste/332',
          'only_matching': True,
      }, {
          'url': 'http://www.zdf.de/ZDFmediathek/kanaluebersicht/meist-gesehen/332',
          'only_matching': True,
      }, {
          'url': 'http://www.zdf.de/ZDFmediathek/kanaluebersicht/_/1798716?bc=nrt;nrm?flash=off',
          'only_matching': True,
      }]
      _PAGE_SIZE = 50
  
      def _fetch_page(self, channel_id, page):
          offset = page * self._PAGE_SIZE
          xml_url = (
              'http://www.zdf.de/ZDFmediathek/xmlservice/web/aktuellste?ak=web&offset=%d&maxLength=%d&id=%s'
              % (offset, self._PAGE_SIZE, channel_id))
          doc = self._download_xml(
              xml_url, channel_id,
              note='Downloading channel info',
              errnote='Failed to download channel info')
  
          title = doc.find('.//information/title').text
          description = doc.find('.//information/detail').text
          for asset in doc.findall('.//teasers/teaser'):
              a_type = asset.find('./type').text
              a_id = asset.find('./details/assetId').text
              if a_type not in ('video', 'topic'):
                  continue
              yield {
                  '_type': 'url',
                  'playlist_title': title,
                  'playlist_description': description,
                  'url': 'zdf:%s:%s' % (a_type, a_id),
              }
  
      def _real_extract(self, url):
          channel_id = self._match_id(url)
          entries = OnDemandPagedList(
              functools.partial(self._fetch_page, channel_id), self._PAGE_SIZE)
  
          return {
              '_type': 'playlist',
              'id': channel_id,
              'entries': entries,
          }
  