text: from __future__ import unicode_literals
  
  import re
  
  from .common import InfoExtractor
  from ..compat import compat_HTMLParseError
  from ..utils import (
      determine_ext,
      ExtractorError,
      extract_attributes,
      find_xpath_attr,
      get_element_by_attribute,
      get_element_by_class,
      int_or_none,
      join_nonempty,
      js_to_json,
      merge_dicts,
      parse_iso8601,
      parse_qs,
      smuggle_url,
      str_to_int,
      unescapeHTML,
  )
  from .senategov import SenateISVPIE
  from .ustream import UstreamIE
  
  
  class CSpanIE(InfoExtractor):
      _VALID_URL = r'https?://(?:www\.)?c-span\.org/video/\?(?P<id>[0-9a-f]+)'
      IE_DESC = 'C-SPAN'
      _TESTS = [{
          'url': 'http://www.c-span.org/video/?313572-1/HolderonV',
          'md5': '94b29a4f131ff03d23471dd6f60b6a1d',
          'info_dict': {
              'id': '315139',
              'title': 'Attorney General Eric Holder on Voting Rights Act Decision',
          },
          'playlist_mincount': 2,
          'skip': 'Regularly fails on travis, for unknown reasons',
      }, {
          'url': 'http://www.c-span.org/video/?c4486943/cspan-international-health-care-models',
          # md5 is unstable
          'info_dict': {
              'id': 'c4486943',
              'ext': 'mp4',
              'title': 'CSPAN - International Health Care Models',
              'description': 'md5:7a985a2d595dba00af3d9c9f0783c967',
          }
      }, {
          'url': 'http://www.c-span.org/video/?318608-1/gm-ignition-switch-recall',
          'info_dict': {
              'id': '342759',
              'title': 'General Motors Ignition Switch Recall',
          },
          'playlist_mincount': 6,
      }, {
          # Video from senate.gov
          'url': 'http://www.c-span.org/video/?104517-1/immigration-reforms-needed-protect-skilled-american-workers',
          'info_dict': {
              'id': 'judiciary031715',
              'ext': 'mp4',
              'title': 'Immigration Reforms Needed to Protect Skilled American Workers',
          },
          'params': {
              'skip_download': True,  # m3u8 downloads
          }
      }, {
          # Ustream embedded video
          'url': 'https://www.c-span.org/video/?114917-1/armed-services',
          'info_dict': {
              'id': '58428542',
              'ext': 'flv',
              'title': 'USHR07 Armed Services Committee',
              'description': 'hsas00-2118-20150204-1000et-07\n\n\nUSHR07 Armed Services Committee',
              'timestamp': 1423060374,
              'upload_date': '20150204',
              'uploader': 'HouseCommittee',
              'uploader_id': '12987475',
          },
      }, {
          # Audio Only
          'url': 'https://www.c-span.org/video/?437336-1/judiciary-antitrust-competition-policy-consumer-rights',
          'only_matching': True,
      }]
      BRIGHTCOVE_URL_TEMPLATE = 'http://players.brightcove.net/%s/%s_%s/index.html?videoId=%s'
  
      def _real_extract(self, url):
          video_id = self._match_id(url)
          video_type = None
          webpage = self._download_webpage(url, video_id)
  
          ustream_url = UstreamIE._extract_url(webpage)
          if ustream_url:
              return self.url_result(ustream_url, UstreamIE.ie_key())
  
          if '&vod' not in url:
              bc = self._search_regex(
                  r"(<[^>]+id='brightcove-player-embed'[^>]+>)",
                  webpage, 'brightcove embed', default=None)
              if bc:
                  bc_attr = extract_attributes(bc)
                  bc_url = self.BRIGHTCOVE_URL_TEMPLATE % (
                      bc_attr.get('data-bcaccountid', '3162030207001'),
                      bc_attr.get('data-noprebcplayerid', 'SyGGpuJy3g'),
                      bc_attr.get('data-newbcplayerid', 'default'),
                      bc_attr['data-bcid'])
                  return self.url_result(smuggle_url(bc_url, {'source_url': url}))
  
          def add_referer(formats):
              for f in formats:
                  f.setdefault('http_headers', {})['Referer'] = url
  
          # As of 01.12.2020 this path looks to cover all cases making the rest
          # of the code unnecessary
          jwsetup = self._parse_json(
              self._search_regex(
                  r'(?s)jwsetup\s*=\s*({.+?})\s*;', webpage, 'jwsetup',
                  default='{}'),
              video_id, transform_source=js_to_json, fatal=False)
          if jwsetup:
              info = self._parse_jwplayer_data(
                  jwsetup, video_id, require_title=False, m3u8_id='hls',
                  base_url=url)
              add_referer(info['formats'])
              for subtitles in info['subtitles'].values():
                  for subtitle in subtitles:
                      ext = determine_ext(subtitle['url'])
                      if ext == 'php':
                          ext = 'vtt'
                      subtitle['ext'] = ext
              ld_info = self._search_json_ld(webpage, video_id, default={})
              try:
                  title = get_element_by_class('video-page-title', webpage)
              except compat_HTMLParseError:
                  title = None
              if title is None:
                  title = self._og_search_title(webpage)
              description = get_element_by_attribute('itemprop', 'description', webpage) or \
                  self._html_search_meta(['og:description', 'description'], webpage)
              return merge_dicts(info, ld_info, {
                  'title': title,
                  'thumbnail': get_element_by_attribute('itemprop', 'thumbnailUrl', webpage),
                  'description': description,
                  'timestamp': parse_iso8601(get_element_by_attribute('itemprop', 'uploadDate', webpage)),
                  'location': get_element_by_attribute('itemprop', 'contentLocation', webpage),
                  'duration': int_or_none(self._search_regex(
                      r'jwsetup\.seclength\s*=\s*(\d+);',
                      webpage, 'duration', fatal=False)),
                  'view_count': str_to_int(self._search_regex(
                      r"<span[^>]+class='views'[^>]*>([\d,]+)\s+Views</span>",
                      webpage, 'views', fatal=False)),
              })
  
          # Obsolete
          # We first look for clipid, because clipprog always appears before
          patterns = [r'id=\'clip(%s)\'\s*value=\'([0-9]+)\'' % t for t in ('id', 'prog')]
          results = list(filter(None, (re.search(p, webpage) for p in patterns)))
          if results:
              matches = results[0]
              video_type, video_id = matches.groups()
              video_type = 'clip' if video_type == 'id' else 'program'
          else:
              m = re.search(r'data-(?P<type>clip|prog)id=["\'](?P<id>\d+)', webpage)
              if m:
                  video_id = m.group('id')
                  video_type = 'program' if m.group('type') == 'prog' else 'clip'
              else:
                  senate_isvp_url = SenateISVPIE._search_iframe_url(webpage)
                  if senate_isvp_url:
                      title = self._og_search_title(webpage)
                      surl = smuggle_url(senate_isvp_url, {'force_title': title})
                      return self.url_result(surl, 'SenateISVP', video_id, title)
                  video_id = self._search_regex(
                      r'jwsetup\.clipprog\s*=\s*(\d+);',
                      webpage, 'jwsetup program id', default=None)
                  if video_id:
                      video_type = 'program'
          if video_type is None or video_id is None:
              error_message = get_element_by_class('VLplayer-error-message', webpage)
              if error_message:
                  raise ExtractorError(error_message)
              raise ExtractorError('unable to find video id and type')
  
          def get_text_attr(d, attr):
              return d.get(attr, {}).get('#text')
  
          data = self._download_json(
              'http://www.c-span.org/assets/player/ajax-player.php?os=android&html5=%s&id=%s' % (video_type, video_id),
              video_id)['video']
          if data['@status'] != 'Success':
              raise ExtractorError('%s said: %s' % (self.IE_NAME, get_text_attr(data, 'error')), expected=True)
  
          doc = self._download_xml(
              'http://www.c-span.org/common/services/flashXml.php?%sid=%s' % (video_type, video_id),
              video_id)
  
          description = self._html_search_meta('description', webpage)
  
          title = find_xpath_attr(doc, './/string', 'name', 'title').text
          thumbnail = find_xpath_attr(doc, './/string', 'name', 'poster').text
  
          files = data['files']
          capfile = get_text_attr(data, 'capfile')
  
          entries = []
          for partnum, f in enumerate(files):
              formats = []
              for quality in f.get('qualities', []):
                  formats.append({
                      'format_id': '%s-%sp' % (get_text_attr(quality, 'bitrate'), get_text_attr(quality, 'height')),
                      'url': unescapeHTML(get_text_attr(quality, 'file')),
                      'height': int_or_none(get_text_attr(quality, 'height')),
                      'tbr': int_or_none(get_text_attr(quality, 'bitrate')),
                  })
              if not formats:
                  path = unescapeHTML(get_text_attr(f, 'path'))
                  if not path:
                      continue
                  formats = self._extract_m3u8_formats(
                      path, video_id, 'mp4', entry_protocol='m3u8_native',
                      m3u8_id='hls') if determine_ext(path) == 'm3u8' else [{'url': path, }]
              add_referer(formats)
              self._sort_formats(formats)
              entries.append({
                  'id': '%s_%d' % (video_id, partnum + 1),
                  'title': (
                      title if len(files) == 1 else
                      '%s part %d' % (title, partnum + 1)),
                  'formats': formats,
                  'description': description,
                  'thumbnail': thumbnail,
                  'duration': int_or_none(get_text_attr(f, 'length')),
                  'subtitles': {
                      'en': [{
                          'url': capfile,
                          'ext': determine_ext(capfile, 'dfxp')
                      }],
                  } if capfile else None,
              })
  
          if len(entries) == 1:
              entry = dict(entries[0])
              entry['id'] = 'c' + video_id if video_type == 'clip' else video_id
              return entry
          else:
              return {
                  '_type': 'playlist',
                  'entries': entries,
                  'title': title,
                  'id': 'c' + video_id if video_type == 'clip' else video_id,
              }
  
  
  class CSpanCongressIE(InfoExtractor):
      _VALID_URL = r'https?://(?:www\.)?c-span\.org/congress/'
      _TESTS = [{
          'url': 'https://www.c-span.org/congress/?chamber=house&date=2017-12-13&t=1513208380',
          'info_dict': {
              'id': 'house_2017-12-13',
              'title': 'Congressional Chronicle - Members of Congress, Hearings and More',
              'description': 'md5:54c264b7a8f219937987610243305a84',
              'thumbnail': r're:https://ximage.c-spanvideo.org/.+',
              'ext': 'mp4'
          }
      }]
  
      def _real_extract(self, url):
          query = parse_qs(url)
          video_date = query.get('date', [None])[0]
          video_id = join_nonempty(query.get('chamber', ['senate'])[0], video_date, delim='_')
          webpage = self._download_webpage(url, video_id)
          if not video_date:
              jwp_date = re.search(r'jwsetup.clipprogdate = \'(?P<date>\d{4}-\d{2}-\d{2})\';', webpage)
              if jwp_date:
                  video_id = f'{video_id}_{jwp_date.group("date")}'
          jwplayer_data = self._parse_json(
              self._search_regex(r'jwsetup\s*=\s*({(?:.|\n)[^;]+});', webpage, 'player config'),
              video_id, transform_source=js_to_json)
  
          title = (self._og_search_title(webpage, default=None)
                   or self._html_search_regex(r'(?s)<title>(.*?)</title>', webpage, 'video title'))
          description = (self._og_search_description(webpage, default=None)
                         or self._html_search_meta('description', webpage, 'description', default=None))
  
          return {
              **self._parse_jwplayer_data(jwplayer_data, video_id, False),
              'title': re.sub(r'\s+', ' ', title.split('|')[0]).strip(),
              'description': description,
              'http_headers': {'Referer': 'https://www.c-span.org/'},
          }
  