youtube_dl/extractor/youtube.py

   1 # coding: utf-8
   2
   3 import collections
   4 import errno
   5 import io
   6 import itertools
   7 import json
   8 import os.path
   9 import re
  10 import string
  11 import struct
  12 import traceback
  13 import zlib
  14
  15 from .common import InfoExtractor, SearchInfoExtractor
  16 from .subtitles import SubtitlesInfoExtractor
  17 from ..utils import (
  18     compat_chr,
  19     compat_parse_qs,
  20     compat_urllib_parse,
  21     compat_urllib_request,
  22     compat_urlparse,
  23     compat_str,
  24
  25     clean_html,
  26     get_cachedir,
  27     get_element_by_id,
  28     get_element_by_attribute,
  29     ExtractorError,
  30     unescapeHTML,
  31     unified_strdate,
  32     orderedSet,
  33     write_json_file,
  34 )
  35
  36 class YoutubeBaseInfoExtractor(InfoExtractor):
  37     """Provide base functions for Youtube extractors"""
  38     _LOGIN_URL = 'https://accounts.google.com/ServiceLogin'
  39     _LANG_URL = r'https://www.youtube.com/?hl=en&persist_hl=1&gl=US&persist_gl=1&opt_out_ackd=1'
  40     _AGE_URL = 'http://www.youtube.com/verify_age?next_url=/&gl=US&hl=en'
  41     _NETRC_MACHINE = 'youtube'
  42     # If True it will raise an error if no login info is provided
  43     _LOGIN_REQUIRED = False
  44
  45     def _set_language(self):
  46         return bool(self._download_webpage(
  47             self._LANG_URL, None,
  48             note=u'Setting language', errnote='unable to set language',
  49             fatal=False))
  50
  51     def _login(self):
  52         (username, password) = self._get_login_info()
  53         # No authentication to be performed
  54         if username is None:
  55             if self._LOGIN_REQUIRED:
  56                 raise ExtractorError(u'No login info available, needed for using %s.' % self.IE_NAME, expected=True)
  57             return False
  58
  59         login_page = self._download_webpage(
  60             self._LOGIN_URL, None,
  61             note=u'Downloading login page',
  62             errnote=u'unable to fetch login page', fatal=False)
  63         if login_page is False:
  64             return
  65
  66         galx = self._search_regex(r'(?s)<input.+?name="GALX".+?value="(.+?)"',
  67                                   login_page, u'Login GALX parameter')
  68
  69         # Log in
  70         login_form_strs = {
  71                 u'continue': u'https://www.youtube.com/signin?action_handle_signin=true&feature=sign_in_button&hl=en_US&nomobiletemp=1',
  72                 u'Email': username,
  73                 u'GALX': galx,
  74                 u'Passwd': password,
  75                 u'PersistentCookie': u'yes',
  76                 u'_utf8': u'霱',
  77                 u'bgresponse': u'js_disabled',
  78                 u'checkConnection': u'',
  79                 u'checkedDomains': u'youtube',
  80                 u'dnConn': u'',
  81                 u'pstMsg': u'0',
  82                 u'rmShown': u'1',
  83                 u'secTok': u'',
  84                 u'signIn': u'Sign in',
  85                 u'timeStmp': u'',
  86                 u'service': u'youtube',
  87                 u'uilel': u'3',
  88                 u'hl': u'en_US',
  89         }
  90         # Convert to UTF-8 *before* urlencode because Python 2.x's urlencode
  91         # chokes on unicode
  92         login_form = dict((k.encode('utf-8'), v.encode('utf-8')) for k,v in login_form_strs.items())
  93         login_data = compat_urllib_parse.urlencode(login_form).encode('ascii')
  94
  95         req = compat_urllib_request.Request(self._LOGIN_URL, login_data)
  96         login_results = self._download_webpage(
  97             req, None,
  98             note=u'Logging in', errnote=u'unable to log in', fatal=False)
  99         if login_results is False:
 100             return False
 101         if re.search(r'(?i)<form[^>]* id="gaia_loginform"', login_results) is not None:
 102             self._downloader.report_warning(u'unable to log in: bad username or password')
 103             return False
 104         return True
 105
 106     def _confirm_age(self):
 107         age_form = {
 108             'next_url': '/',
 109             'action_confirm': 'Confirm',
 110         }
 111         req = compat_urllib_request.Request(self._AGE_URL, compat_urllib_parse.urlencode(age_form))
 112
 113         self._download_webpage(
 114             req, None,
 115             note=u'Confirming age', errnote=u'Unable to confirm age')
 116         return True
 117
 118     def _real_initialize(self):
 119         if self._downloader is None:
 120             return
 121         if not self._set_language():
 122             return
 123         if not self._login():
 124             return
 125         self._confirm_age()
 126
 127
 128 class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
 129     IE_DESC = u'YouTube.com'
 130     _VALID_URL = r"""(?x)^
 131                      (
 132                          (?:https?://|//)?                                    # http(s):// or protocol-independent URL (optional)
 133                          (?:(?:(?:(?:\w+\.)?[yY][oO][uU][tT][uU][bB][eE](?:-nocookie)?\.com/|
 134                             (?:www\.)?deturl\.com/www\.youtube\.com/|
 135                             (?:www\.)?pwnyoutube\.com|
 136                             tube\.majestyc\.net/|
 137                             youtube\.googleapis\.com/)                        # the various hostnames, with wildcard subdomains
 138                          (?:.*?\#/)?                                          # handle anchor (#/) redirect urls
 139                          (?:                                                  # the various things that can precede the ID:
 140                              (?:(?:v|embed|e)/)                               # v/ or embed/ or e/
 141                              |(?:                                             # or the v= param in all its forms
 142                                  (?:(?:watch|movie)(?:_popup)?(?:\.php)?)?    # preceding watch(_popup|.php) or nothing (like /?v=xxxx)
 143                                  (?:\?|\#!?)                                  # the params delimiter ? or # or #!
 144                                  (?:.*?&)?                                    # any other preceding param (like /?s=tuff&v=xxxx)
 145                                  v=
 146                              )
 147                          ))
 148                          |youtu\.be/                                          # just youtu.be/xxxx
 149                          )
 150                      )?                                                       # all until now is optional -> you can pass the naked ID
 151                      ([0-9A-Za-z_-]{11})                                      # here is it! the YouTube video ID
 152                      (?(1).+)?                                                # if we found the ID, everything can follow
 153                      $"""
 154     _NEXT_URL_RE = r'[\?&]next_url=([^&]+)'
 155     _formats = {
 156         '5': {'ext': 'flv', 'width': 400, 'height': 240},
 157         '6': {'ext': 'flv', 'width': 450, 'height': 270},
 158         '13': {'ext': '3gp'},
 159         '17': {'ext': '3gp', 'width': 176, 'height': 144},
 160         '18': {'ext': 'mp4', 'width': 640, 'height': 360},
 161         '22': {'ext': 'mp4', 'width': 1280, 'height': 720},
 162         '34': {'ext': 'flv', 'width': 640, 'height': 360},
 163         '35': {'ext': 'flv', 'width': 854, 'height': 480},
 164         '36': {'ext': '3gp', 'width': 320, 'height': 240},
 165         '37': {'ext': 'mp4', 'width': 1920, 'height': 1080},
 166         '38': {'ext': 'mp4', 'width': 4096, 'height': 3072},
 167         '43': {'ext': 'webm', 'width': 640, 'height': 360},
 168         '44': {'ext': 'webm', 'width': 854, 'height': 480},
 169         '45': {'ext': 'webm', 'width': 1280, 'height': 720},
 170         '46': {'ext': 'webm', 'width': 1920, 'height': 1080},
 171
 172
 173         # 3d videos
 174         '82': {'ext': 'mp4', 'height': 360, 'resolution': '360p', 'format_note': '3D', 'preference': -20},
 175         '83': {'ext': 'mp4', 'height': 480, 'resolution': '480p', 'format_note': '3D', 'preference': -20},
 176         '84': {'ext': 'mp4', 'height': 720, 'resolution': '720p', 'format_note': '3D', 'preference': -20},
 177         '85': {'ext': 'mp4', 'height': 1080, 'resolution': '1080p', 'format_note': '3D', 'preference': -20},
 178         '100': {'ext': 'webm', 'height': 360, 'resolution': '360p', 'format_note': '3D', 'preference': -20},
 179         '101': {'ext': 'webm', 'height': 480, 'resolution': '480p', 'format_note': '3D', 'preference': -20},
 180         '102': {'ext': 'webm', 'height': 720, 'resolution': '720p', 'format_note': '3D', 'preference': -20},
 181
 182         # Apple HTTP Live Streaming
 183         '92': {'ext': 'mp4', 'height': 240, 'resolution': '240p', 'format_note': 'HLS', 'preference': -10},
 184         '93': {'ext': 'mp4', 'height': 360, 'resolution': '360p', 'format_note': 'HLS', 'preference': -10},
 185         '94': {'ext': 'mp4', 'height': 480, 'resolution': '480p', 'format_note': 'HLS', 'preference': -10},
 186         '95': {'ext': 'mp4', 'height': 720, 'resolution': '720p', 'format_note': 'HLS', 'preference': -10},
 187         '96': {'ext': 'mp4', 'height': 1080, 'resolution': '1080p', 'format_note': 'HLS', 'preference': -10},
 188         '132': {'ext': 'mp4', 'height': 240, 'resolution': '240p', 'format_note': 'HLS', 'preference': -10},
 189         '151': {'ext': 'mp4', 'height': 72, 'resolution': '72p', 'format_note': 'HLS', 'preference': -10},
 190
 191         # DASH mp4 video
 192         '133': {'ext': 'mp4', 'height': 240, 'resolution': '240p', 'format_note': 'DASH video', 'preference': -40},
 193         '134': {'ext': 'mp4', 'height': 360, 'resolution': '360p', 'format_note': 'DASH video', 'preference': -40},
 194         '135': {'ext': 'mp4', 'height': 480, 'resolution': '480p', 'format_note': 'DASH video', 'preference': -40},
 195         '136': {'ext': 'mp4', 'height': 720, 'resolution': '720p', 'format_note': 'DASH video', 'preference': -40},
 196         '137': {'ext': 'mp4', 'height': 1080, 'resolution': '1080p', 'format_note': 'DASH video', 'preference': -40},
 197         '138': {'ext': 'mp4', 'height': 1081, 'resolution': '>1080p', 'format_note': 'DASH video', 'preference': -40},
 198         '160': {'ext': 'mp4', 'height': 192, 'resolution': '192p', 'format_note': 'DASH video', 'preference': -40},
 199         '264': {'ext': 'mp4', 'height': 1080, 'resolution': '1080p', 'format_note': 'DASH video', 'preference': -40},
 200
 201         # Dash mp4 audio
 202         '139': {'ext': 'm4a', 'format_note': 'DASH audio', 'vcodec': 'none', 'abr': 48, 'preference': -50},
 203         '140': {'ext': 'm4a', 'format_note': 'DASH audio', 'vcodec': 'none', 'abr': 128, 'preference': -50},
 204         '141': {'ext': 'm4a', 'format_note': 'DASH audio', 'vcodec': 'none', 'abr': 256, 'preference': -50},
 205
 206         # Dash webm
 207         '242': {'ext': 'webm', 'height': 240, 'resolution': '240p', 'format_note': 'DASH webm', 'preference': -40},
 208         '243': {'ext': 'webm', 'height': 360, 'resolution': '360p', 'format_note': 'DASH webm', 'preference': -40},
 209         '244': {'ext': 'webm', 'height': 480, 'resolution': '480p', 'format_note': 'DASH webm', 'preference': -40},
 210         '245': {'ext': 'webm', 'height': 480, 'resolution': '480p', 'format_note': 'DASH webm', 'preference': -40},
 211         '246': {'ext': 'webm', 'height': 480, 'resolution': '480p', 'format_note': 'DASH webm', 'preference': -40},
 212         '247': {'ext': 'webm', 'height': 720, 'resolution': '720p', 'format_note': 'DASH webm', 'preference': -40},
 213         '248': {'ext': 'webm', 'height': 1080, 'resolution': '1080p', 'format_note': 'DASH webm', 'preference': -40},
 214
 215         # Dash webm audio
 216         '171': {'ext': 'webm', 'vcodec': 'none', 'format_note': 'DASH webm audio', 'abr': 48, 'preference': -50},
 217         '172': {'ext': 'webm', 'vcodec': 'none', 'format_note': 'DASH webm audio', 'abr': 256, 'preference': -50},
 218
 219         # RTMP (unnamed)
 220         '_rtmp': {'protocol': 'rtmp'},
 221     }
 222
 223     IE_NAME = u'youtube'
 224     _TESTS = [
 225         {
 226             u"url":  u"http://www.youtube.com/watch?v=BaW_jenozKc",
 227             u"file":  u"BaW_jenozKc.mp4",
 228             u"info_dict": {
 229                 u"title": u"youtube-dl test video \"'/\\ä↭𝕐",
 230                 u"uploader": u"Philipp Hagemeister",
 231                 u"uploader_id": u"phihag",
 232                 u"upload_date": u"20121002",
 233                 u"description": u"test chars:  \"'/\\ä↭𝕐\ntest URL: https://github.com/rg3/youtube-dl/issues/1892\n\nThis is a test video for youtube-dl.\n\nFor more information, contact phihag@phihag.de ."
 234             }
 235         },
 236         {
 237             u"url":  u"http://www.youtube.com/watch?v=UxxajLWwzqY",
 238             u"file":  u"UxxajLWwzqY.mp4",
 239             u"note": u"Test generic use_cipher_signature video (#897)",
 240             u"info_dict": {
 241                 u"upload_date": u"20120506",
 242                 u"title": u"Icona Pop - I Love It (feat. Charli XCX) [OFFICIAL VIDEO]",
 243                 u"description": u"md5:5b292926389560516e384ac437c0ec07",
 244                 u"uploader": u"Icona Pop",
 245                 u"uploader_id": u"IconaPop"
 246             }
 247         },
 248         {
 249             u"url":  u"https://www.youtube.com/watch?v=07FYdnEawAQ",
 250             u"file":  u"07FYdnEawAQ.mp4",
 251             u"note": u"Test VEVO video with age protection (#956)",
 252             u"info_dict": {
 253                 u"upload_date": u"20130703",
 254                 u"title": u"Justin Timberlake - Tunnel Vision (Explicit)",
 255                 u"description": u"md5:64249768eec3bc4276236606ea996373",
 256                 u"uploader": u"justintimberlakeVEVO",
 257                 u"uploader_id": u"justintimberlakeVEVO"
 258             }
 259         },
 260         {
 261             u"url":  u"//www.YouTube.com/watch?v=yZIXLfi8CZQ",
 262             u"file":  u"yZIXLfi8CZQ.mp4",
 263             u"note": u"Embed-only video (#1746)",
 264             u"info_dict": {
 265                 u"upload_date": u"20120608",
 266                 u"title": u"Principal Sexually Assaults A Teacher - Episode 117 - 8th June 2012",
 267                 u"description": u"md5:09b78bd971f1e3e289601dfba15ca4f7",
 268                 u"uploader": u"SET India",
 269                 u"uploader_id": u"setindia"
 270             }
 271         },
 272     ]
 273
 274
 275     @classmethod
 276     def suitable(cls, url):
 277         """Receives a URL and returns True if suitable for this IE."""
 278         if YoutubePlaylistIE.suitable(url): return False
 279         return re.match(cls._VALID_URL, url) is not None
 280
 281     def __init__(self, *args, **kwargs):
 282         super(YoutubeIE, self).__init__(*args, **kwargs)
 283         self._player_cache = {}
 284
 285     def report_video_info_webpage_download(self, video_id):
 286         """Report attempt to download video info webpage."""
 287         self.to_screen(u'%s: Downloading video info webpage' % video_id)
 288
 289     def report_information_extraction(self, video_id):
 290         """Report attempt to extract video information."""
 291         self.to_screen(u'%s: Extracting video information' % video_id)
 292
 293     def report_unavailable_format(self, video_id, format):
 294         """Report extracted video URL."""
 295         self.to_screen(u'%s: Format %s not available' % (video_id, format))
 296
 297     def report_rtmp_download(self):
 298         """Indicate the download will use the RTMP protocol."""
 299         self.to_screen(u'RTMP download detected')
 300
 301     def _extract_signature_function(self, video_id, player_url, slen):
 302         id_m = re.match(r'.*-(?P<id>[a-zA-Z0-9_-]+)\.(?P<ext>[a-z]+)$',
 303                         player_url)
 304         player_type = id_m.group('ext')
 305         player_id = id_m.group('id')
 306
 307         # Read from filesystem cache
 308         func_id = '%s_%s_%d' % (player_type, player_id, slen)
 309         assert os.path.basename(func_id) == func_id
 310         cache_dir = get_cachedir(self._downloader.params)
 311
 312         cache_enabled = cache_dir is not None
 313         if cache_enabled:
 314             cache_fn = os.path.join(os.path.expanduser(cache_dir),
 315                                     u'youtube-sigfuncs',
 316                                     func_id + '.json')
 317             try:
 318                 with io.open(cache_fn, 'r', encoding='utf-8') as cachef:
 319                     cache_spec = json.load(cachef)
 320                 return lambda s: u''.join(s[i] for i in cache_spec)
 321             except IOError:
 322                 pass  # No cache available
 323
 324         if player_type == 'js':
 325             code = self._download_webpage(
 326                 player_url, video_id,
 327                 note=u'Downloading %s player %s' % (player_type, player_id),
 328                 errnote=u'Download of %s failed' % player_url)
 329             res = self._parse_sig_js(code)
 330         elif player_type == 'swf':
 331             urlh = self._request_webpage(
 332                 player_url, video_id,
 333                 note=u'Downloading %s player %s' % (player_type, player_id),
 334                 errnote=u'Download of %s failed' % player_url)
 335             code = urlh.read()
 336             res = self._parse_sig_swf(code)
 337         else:
 338             assert False, 'Invalid player type %r' % player_type
 339
 340         if cache_enabled:
 341             try:
 342                 test_string = u''.join(map(compat_chr, range(slen)))
 343                 cache_res = res(test_string)
 344                 cache_spec = [ord(c) for c in cache_res]
 345                 try:
 346                     os.makedirs(os.path.dirname(cache_fn))
 347                 except OSError as ose:
 348                     if ose.errno != errno.EEXIST:
 349                         raise
 350                 write_json_file(cache_spec, cache_fn)
 351             except Exception:
 352                 tb = traceback.format_exc()
 353                 self._downloader.report_warning(
 354                     u'Writing cache to %r failed: %s' % (cache_fn, tb))
 355
 356         return res
 357
 358     def _print_sig_code(self, func, slen):
 359         def gen_sig_code(idxs):
 360             def _genslice(start, end, step):
 361                 starts = u'' if start == 0 else str(start)
 362                 ends = (u':%d' % (end+step)) if end + step >= 0 else u':'
 363                 steps = u'' if step == 1 else (u':%d' % step)
 364                 return u's[%s%s%s]' % (starts, ends, steps)
 365
 366             step = None
 367             start = '(Never used)'  # Quelch pyflakes warnings - start will be
 368                                     # set as soon as step is set
 369             for i, prev in zip(idxs[1:], idxs[:-1]):
 370                 if step is not None:
 371                     if i - prev == step:
 372                         continue
 373                     yield _genslice(start, prev, step)
 374                     step = None
 375                     continue
 376                 if i - prev in [-1, 1]:
 377                     step = i - prev
 378                     start = prev
 379                     continue
 380                 else:
 381                     yield u's[%d]' % prev
 382             if step is None:
 383                 yield u's[%d]' % i
 384             else:
 385                 yield _genslice(start, i, step)
 386
 387         test_string = u''.join(map(compat_chr, range(slen)))
 388         cache_res = func(test_string)
 389         cache_spec = [ord(c) for c in cache_res]
 390         expr_code = u' + '.join(gen_sig_code(cache_spec))
 391         code = u'if len(s) == %d:\n    return %s\n' % (slen, expr_code)
 392         self.to_screen(u'Extracted signature function:\n' + code)
 393
 394     def _parse_sig_js(self, jscode):
 395         funcname = self._search_regex(
 396             r'signature=([a-zA-Z]+)', jscode,
 397             u'Initial JS player signature function name')
 398
 399         functions = {}
 400
 401         def argidx(varname):
 402             return string.lowercase.index(varname)
 403
 404         def interpret_statement(stmt, local_vars, allow_recursion=20):
 405             if allow_recursion < 0:
 406                 raise ExtractorError(u'Recursion limit reached')
 407
 408             if stmt.startswith(u'var '):
 409                 stmt = stmt[len(u'var '):]
 410             ass_m = re.match(r'^(?P<out>[a-z]+)(?:\[(?P<index>[^\]]+)\])?' +
 411                              r'=(?P<expr>.*)$', stmt)
 412             if ass_m:
 413                 if ass_m.groupdict().get('index'):
 414                     def assign(val):
 415                         lvar = local_vars[ass_m.group('out')]
 416                         idx = interpret_expression(ass_m.group('index'),
 417                                                    local_vars, allow_recursion)
 418                         assert isinstance(idx, int)
 419                         lvar[idx] = val
 420                         return val
 421                     expr = ass_m.group('expr')
 422                 else:
 423                     def assign(val):
 424                         local_vars[ass_m.group('out')] = val
 425                         return val
 426                     expr = ass_m.group('expr')
 427             elif stmt.startswith(u'return '):
 428                 assign = lambda v: v
 429                 expr = stmt[len(u'return '):]
 430             else:
 431                 raise ExtractorError(
 432                     u'Cannot determine left side of statement in %r' % stmt)
 433
 434             v = interpret_expression(expr, local_vars, allow_recursion)
 435             return assign(v)
 436
 437         def interpret_expression(expr, local_vars, allow_recursion):
 438             if expr.isdigit():
 439                 return int(expr)
 440
 441             if expr.isalpha():
 442                 return local_vars[expr]
 443
 444             m = re.match(r'^(?P<in>[a-z]+)\.(?P<member>.*)$', expr)
 445             if m:
 446                 member = m.group('member')
 447                 val = local_vars[m.group('in')]
 448                 if member == 'split("")':
 449                     return list(val)
 450                 if member == 'join("")':
 451                     return u''.join(val)
 452                 if member == 'length':
 453                     return len(val)
 454                 if member == 'reverse()':
 455                     return val[::-1]
 456                 slice_m = re.match(r'slice\((?P<idx>.*)\)', member)
 457                 if slice_m:
 458                     idx = interpret_expression(
 459                         slice_m.group('idx'), local_vars, allow_recursion-1)
 460                     return val[idx:]
 461
 462             m = re.match(
 463                 r'^(?P<in>[a-z]+)\[(?P<idx>.+)\]$', expr)
 464             if m:
 465                 val = local_vars[m.group('in')]
 466                 idx = interpret_expression(m.group('idx'), local_vars,
 467                                            allow_recursion-1)
 468                 return val[idx]
 469
 470             m = re.match(r'^(?P<a>.+?)(?P<op>[%])(?P<b>.+?)$', expr)
 471             if m:
 472                 a = interpret_expression(m.group('a'),
 473                                          local_vars, allow_recursion)
 474                 b = interpret_expression(m.group('b'),
 475                                          local_vars, allow_recursion)
 476                 return a % b
 477
 478             m = re.match(
 479                 r'^(?P<func>[a-zA-Z]+)\((?P<args>[a-z0-9,]+)\)$', expr)
 480             if m:
 481                 fname = m.group('func')
 482                 if fname not in functions:
 483                     functions[fname] = extract_function(fname)
 484                 argvals = [int(v) if v.isdigit() else local_vars[v]
 485                            for v in m.group('args').split(',')]
 486                 return functions[fname](argvals)
 487             raise ExtractorError(u'Unsupported JS expression %r' % expr)
 488
 489         def extract_function(funcname):
 490             func_m = re.search(
 491                 r'function ' + re.escape(funcname) +
 492                 r'\((?P<args>[a-z,]+)\){(?P<code>[^}]+)}',
 493                 jscode)
 494             argnames = func_m.group('args').split(',')
 495
 496             def resf(args):
 497                 local_vars = dict(zip(argnames, args))
 498                 for stmt in func_m.group('code').split(';'):
 499                     res = interpret_statement(stmt, local_vars)
 500                 return res
 501             return resf
 502
 503         initial_function = extract_function(funcname)
 504         return lambda s: initial_function([s])
 505
 506     def _parse_sig_swf(self, file_contents):
 507         if file_contents[1:3] != b'WS':
 508             raise ExtractorError(
 509                 u'Not an SWF file; header is %r' % file_contents[:3])
 510         if file_contents[:1] == b'C':
 511             content = zlib.decompress(file_contents[8:])
 512         else:
 513             raise NotImplementedError(u'Unsupported compression format %r' %
 514                                       file_contents[:1])
 515
 516         def extract_tags(content):
 517             pos = 0
 518             while pos < len(content):
 519                 header16 = struct.unpack('<H', content[pos:pos+2])[0]
 520                 pos += 2
 521                 tag_code = header16 >> 6
 522                 tag_len = header16 & 0x3f
 523                 if tag_len == 0x3f:
 524                     tag_len = struct.unpack('<I', content[pos:pos+4])[0]
 525                     pos += 4
 526                 assert pos+tag_len <= len(content)
 527                 yield (tag_code, content[pos:pos+tag_len])
 528                 pos += tag_len
 529
 530         code_tag = next(tag
 531                         for tag_code, tag in extract_tags(content)
 532                         if tag_code == 82)
 533         p = code_tag.index(b'\0', 4) + 1
 534         code_reader = io.BytesIO(code_tag[p:])
 535
 536         # Parse ABC (AVM2 ByteCode)
 537         def read_int(reader=None):
 538             if reader is None:
 539                 reader = code_reader
 540             res = 0
 541             shift = 0
 542             for _ in range(5):
 543                 buf = reader.read(1)
 544                 assert len(buf) == 1
 545                 b = struct.unpack('<B', buf)[0]
 546                 res = res | ((b & 0x7f) << shift)
 547                 if b & 0x80 == 0:
 548                     break
 549                 shift += 7
 550             return res
 551
 552         def u30(reader=None):
 553             res = read_int(reader)
 554             assert res & 0xf0000000 == 0
 555             return res
 556         u32 = read_int
 557
 558         def s32(reader=None):
 559             v = read_int(reader)
 560             if v & 0x80000000 != 0:
 561                 v = - ((v ^ 0xffffffff) + 1)
 562             return v
 563
 564         def read_string(reader=None):
 565             if reader is None:
 566                 reader = code_reader
 567             slen = u30(reader)
 568             resb = reader.read(slen)
 569             assert len(resb) == slen
 570             return resb.decode('utf-8')
 571
 572         def read_bytes(count, reader=None):
 573             if reader is None:
 574                 reader = code_reader
 575             resb = reader.read(count)
 576             assert len(resb) == count
 577             return resb
 578
 579         def read_byte(reader=None):
 580             resb = read_bytes(1, reader=reader)
 581             res = struct.unpack('<B', resb)[0]
 582             return res
 583
 584         # minor_version + major_version
 585         read_bytes(2 + 2)
 586
 587         # Constant pool
 588         int_count = u30()
 589         for _c in range(1, int_count):
 590             s32()
 591         uint_count = u30()
 592         for _c in range(1, uint_count):
 593             u32()
 594         double_count = u30()
 595         read_bytes((double_count-1) * 8)
 596         string_count = u30()
 597         constant_strings = [u'']
 598         for _c in range(1, string_count):
 599             s = read_string()
 600             constant_strings.append(s)
 601         namespace_count = u30()
 602         for _c in range(1, namespace_count):
 603             read_bytes(1)  # kind
 604             u30()  # name
 605         ns_set_count = u30()
 606         for _c in range(1, ns_set_count):
 607             count = u30()
 608             for _c2 in range(count):
 609                 u30()
 610         multiname_count = u30()
 611         MULTINAME_SIZES = {
 612             0x07: 2,  # QName
 613             0x0d: 2,  # QNameA
 614             0x0f: 1,  # RTQName
 615             0x10: 1,  # RTQNameA
 616             0x11: 0,  # RTQNameL
 617             0x12: 0,  # RTQNameLA
 618             0x09: 2,  # Multiname
 619             0x0e: 2,  # MultinameA
 620             0x1b: 1,  # MultinameL
 621             0x1c: 1,  # MultinameLA
 622         }
 623         multinames = [u'']
 624         for _c in range(1, multiname_count):
 625             kind = u30()
 626             assert kind in MULTINAME_SIZES, u'Invalid multiname kind %r' % kind
 627             if kind == 0x07:
 628                 u30()  # namespace_idx
 629                 name_idx = u30()
 630                 multinames.append(constant_strings[name_idx])
 631             else:
 632                 multinames.append('[MULTINAME kind: %d]' % kind)
 633                 for _c2 in range(MULTINAME_SIZES[kind]):
 634                     u30()
 635
 636         # Methods
 637         method_count = u30()
 638         MethodInfo = collections.namedtuple(
 639             'MethodInfo',
 640             ['NEED_ARGUMENTS', 'NEED_REST'])
 641         method_infos = []
 642         for method_id in range(method_count):
 643             param_count = u30()
 644             u30()  # return type
 645             for _ in range(param_count):
 646                 u30()  # param type
 647             u30()  # name index (always 0 for youtube)
 648             flags = read_byte()
 649             if flags & 0x08 != 0:
 650                 # Options present
 651                 option_count = u30()
 652                 for c in range(option_count):
 653                     u30()  # val
 654                     read_bytes(1)  # kind
 655             if flags & 0x80 != 0:
 656                 # Param names present
 657                 for _ in range(param_count):
 658                     u30()  # param name
 659             mi = MethodInfo(flags & 0x01 != 0, flags & 0x04 != 0)
 660             method_infos.append(mi)
 661
 662         # Metadata
 663         metadata_count = u30()
 664         for _c in range(metadata_count):
 665             u30()  # name
 666             item_count = u30()
 667             for _c2 in range(item_count):
 668                 u30()  # key
 669                 u30()  # value
 670
 671         def parse_traits_info():
 672             trait_name_idx = u30()
 673             kind_full = read_byte()
 674             kind = kind_full & 0x0f
 675             attrs = kind_full >> 4
 676             methods = {}
 677             if kind in [0x00, 0x06]:  # Slot or Const
 678                 u30()  # Slot id
 679                 u30()  # type_name_idx
 680                 vindex = u30()
 681                 if vindex != 0:
 682                     read_byte()  # vkind
 683             elif kind in [0x01, 0x02, 0x03]:  # Method / Getter / Setter
 684                 u30()  # disp_id
 685                 method_idx = u30()
 686                 methods[multinames[trait_name_idx]] = method_idx
 687             elif kind == 0x04:  # Class
 688                 u30()  # slot_id
 689                 u30()  # classi
 690             elif kind == 0x05:  # Function
 691                 u30()  # slot_id
 692                 function_idx = u30()
 693                 methods[function_idx] = multinames[trait_name_idx]
 694             else:
 695                 raise ExtractorError(u'Unsupported trait kind %d' % kind)
 696
 697             if attrs & 0x4 != 0:  # Metadata present
 698                 metadata_count = u30()
 699                 for _c3 in range(metadata_count):
 700                     u30()  # metadata index
 701
 702             return methods
 703
 704         # Classes
 705         TARGET_CLASSNAME = u'SignatureDecipher'
 706         searched_idx = multinames.index(TARGET_CLASSNAME)
 707         searched_class_id = None
 708         class_count = u30()
 709         for class_id in range(class_count):
 710             name_idx = u30()
 711             if name_idx == searched_idx:
 712                 # We found the class we're looking for!
 713                 searched_class_id = class_id
 714             u30()  # super_name idx
 715             flags = read_byte()
 716             if flags & 0x08 != 0:  # Protected namespace is present
 717                 u30()  # protected_ns_idx
 718             intrf_count = u30()
 719             for _c2 in range(intrf_count):
 720                 u30()
 721             u30()  # iinit
 722             trait_count = u30()
 723             for _c2 in range(trait_count):
 724                 parse_traits_info()
 725
 726         if searched_class_id is None:
 727             raise ExtractorError(u'Target class %r not found' %
 728                                  TARGET_CLASSNAME)
 729
 730         method_names = {}
 731         method_idxs = {}
 732         for class_id in range(class_count):
 733             u30()  # cinit
 734             trait_count = u30()
 735             for _c2 in range(trait_count):
 736                 trait_methods = parse_traits_info()
 737                 if class_id == searched_class_id:
 738                     method_names.update(trait_methods.items())
 739                     method_idxs.update(dict(
 740                         (idx, name)
 741                         for name, idx in trait_methods.items()))
 742
 743         # Scripts
 744         script_count = u30()
 745         for _c in range(script_count):
 746             u30()  # init
 747             trait_count = u30()
 748             for _c2 in range(trait_count):
 749                 parse_traits_info()
 750
 751         # Method bodies
 752         method_body_count = u30()
 753         Method = collections.namedtuple('Method', ['code', 'local_count'])
 754         methods = {}
 755         for _c in range(method_body_count):
 756             method_idx = u30()
 757             u30()  # max_stack
 758             local_count = u30()
 759             u30()  # init_scope_depth
 760             u30()  # max_scope_depth
 761             code_length = u30()
 762             code = read_bytes(code_length)
 763             if method_idx in method_idxs:
 764                 m = Method(code, local_count)
 765                 methods[method_idxs[method_idx]] = m
 766             exception_count = u30()
 767             for _c2 in range(exception_count):
 768                 u30()  # from
 769                 u30()  # to
 770                 u30()  # target
 771                 u30()  # exc_type
 772                 u30()  # var_name
 773             trait_count = u30()
 774             for _c2 in range(trait_count):
 775                 parse_traits_info()
 776
 777         assert p + code_reader.tell() == len(code_tag)
 778         assert len(methods) == len(method_idxs)
 779
 780         method_pyfunctions = {}
 781
 782         def extract_function(func_name):
 783             if func_name in method_pyfunctions:
 784                 return method_pyfunctions[func_name]
 785             if func_name not in methods:
 786                 raise ExtractorError(u'Cannot find function %r' % func_name)
 787             m = methods[func_name]
 788
 789             def resfunc(args):
 790                 registers = ['(this)'] + list(args) + [None] * m.local_count
 791                 stack = []
 792                 coder = io.BytesIO(m.code)
 793                 while True:
 794                     opcode = struct.unpack('!B', coder.read(1))[0]
 795                     if opcode == 36:  # pushbyte
 796                         v = struct.unpack('!B', coder.read(1))[0]
 797                         stack.append(v)
 798                     elif opcode == 44:  # pushstring
 799                         idx = u30(coder)
 800                         stack.append(constant_strings[idx])
 801                     elif opcode == 48:  # pushscope
 802                         # We don't implement the scope register, so we'll just
 803                         # ignore the popped value
 804                         stack.pop()
 805                     elif opcode == 70:  # callproperty
 806                         index = u30(coder)
 807                         mname = multinames[index]
 808                         arg_count = u30(coder)
 809                         args = list(reversed(
 810                             [stack.pop() for _ in range(arg_count)]))
 811                         obj = stack.pop()
 812                         if mname == u'split':
 813                             assert len(args) == 1
 814                             assert isinstance(args[0], compat_str)
 815                             assert isinstance(obj, compat_str)
 816                             if args[0] == u'':
 817                                 res = list(obj)
 818                             else:
 819                                 res = obj.split(args[0])
 820                             stack.append(res)
 821                         elif mname == u'slice':
 822                             assert len(args) == 1
 823                             assert isinstance(args[0], int)
 824                             assert isinstance(obj, list)
 825                             res = obj[args[0]:]
 826                             stack.append(res)
 827                         elif mname == u'join':
 828                             assert len(args) == 1
 829                             assert isinstance(args[0], compat_str)
 830                             assert isinstance(obj, list)
 831                             res = args[0].join(obj)
 832                             stack.append(res)
 833                         elif mname in method_pyfunctions:
 834                             stack.append(method_pyfunctions[mname](args))
 835                         else:
 836                             raise NotImplementedError(
 837                                 u'Unsupported property %r on %r'
 838                                 % (mname, obj))
 839                     elif opcode == 72:  # returnvalue
 840                         res = stack.pop()
 841                         return res
 842                     elif opcode == 79:  # callpropvoid
 843                         index = u30(coder)
 844                         mname = multinames[index]
 845                         arg_count = u30(coder)
 846                         args = list(reversed(
 847                             [stack.pop() for _ in range(arg_count)]))
 848                         obj = stack.pop()
 849                         if mname == u'reverse':
 850                             assert isinstance(obj, list)
 851                             obj.reverse()
 852                         else:
 853                             raise NotImplementedError(
 854                                 u'Unsupported (void) property %r on %r'
 855                                 % (mname, obj))
 856                     elif opcode == 93:  # findpropstrict
 857                         index = u30(coder)
 858                         mname = multinames[index]
 859                         res = extract_function(mname)
 860                         stack.append(res)
 861                     elif opcode == 97:  # setproperty
 862                         index = u30(coder)
 863                         value = stack.pop()
 864                         idx = stack.pop()
 865                         obj = stack.pop()
 866                         assert isinstance(obj, list)
 867                         assert isinstance(idx, int)
 868                         obj[idx] = value
 869                     elif opcode == 98:  # getlocal
 870                         index = u30(coder)
 871                         stack.append(registers[index])
 872                     elif opcode == 99:  # setlocal
 873                         index = u30(coder)
 874                         value = stack.pop()
 875                         registers[index] = value
 876                     elif opcode == 102:  # getproperty
 877                         index = u30(coder)
 878                         pname = multinames[index]
 879                         if pname == u'length':
 880                             obj = stack.pop()
 881                             assert isinstance(obj, list)
 882                             stack.append(len(obj))
 883                         else:  # Assume attribute access
 884                             idx = stack.pop()
 885                             assert isinstance(idx, int)
 886                             obj = stack.pop()
 887                             assert isinstance(obj, list)
 888                             stack.append(obj[idx])
 889                     elif opcode == 128:  # coerce
 890                         u30(coder)
 891                     elif opcode == 133:  # coerce_s
 892                         assert isinstance(stack[-1], (type(None), compat_str))
 893                     elif opcode == 164:  # modulo
 894                         value2 = stack.pop()
 895                         value1 = stack.pop()
 896                         res = value1 % value2
 897                         stack.append(res)
 898                     elif opcode == 208:  # getlocal_0
 899                         stack.append(registers[0])
 900                     elif opcode == 209:  # getlocal_1
 901                         stack.append(registers[1])
 902                     elif opcode == 210:  # getlocal_2
 903                         stack.append(registers[2])
 904                     elif opcode == 211:  # getlocal_3
 905                         stack.append(registers[3])
 906                     elif opcode == 214:  # setlocal_2
 907                         registers[2] = stack.pop()
 908                     elif opcode == 215:  # setlocal_3
 909                         registers[3] = stack.pop()
 910                     else:
 911                         raise NotImplementedError(
 912                             u'Unsupported opcode %d' % opcode)
 913
 914             method_pyfunctions[func_name] = resfunc
 915             return resfunc
 916
 917         initial_function = extract_function(u'decipher')
 918         return lambda s: initial_function([s])
 919
 920     def _decrypt_signature(self, s, video_id, player_url, age_gate=False):
 921         """Turn the encrypted s field into a working signature"""
 922
 923         if player_url is not None:
 924             if player_url.startswith(u'//'):
 925                 player_url = u'https:' + player_url
 926             try:
 927                 player_id = (player_url, len(s))
 928                 if player_id not in self._player_cache:
 929                     func = self._extract_signature_function(
 930                         video_id, player_url, len(s)
 931                     )
 932                     self._player_cache[player_id] = func
 933                 func = self._player_cache[player_id]
 934                 if self._downloader.params.get('youtube_print_sig_code'):
 935                     self._print_sig_code(func, len(s))
 936                 return func(s)
 937             except Exception:
 938                 tb = traceback.format_exc()
 939                 self._downloader.report_warning(
 940                     u'Automatic signature extraction failed: ' + tb)
 941
 942             self._downloader.report_warning(
 943                 u'Warning: Falling back to static signature algorithm')
 944
 945         return self._static_decrypt_signature(
 946             s, video_id, player_url, age_gate)
 947
 948     def _static_decrypt_signature(self, s, video_id, player_url, age_gate):
 949         if age_gate:
 950             # The videos with age protection use another player, so the
 951             # algorithms can be different.
 952             if len(s) == 86:
 953                 return s[2:63] + s[82] + s[64:82] + s[63]
 954
 955         if len(s) == 93:
 956             return s[86:29:-1] + s[88] + s[28:5:-1]
 957         elif len(s) == 92:
 958             return s[25] + s[3:25] + s[0] + s[26:42] + s[79] + s[43:79] + s[91] + s[80:83]
 959         elif len(s) == 91:
 960             return s[84:27:-1] + s[86] + s[26:5:-1]
 961         elif len(s) == 90:
 962             return s[25] + s[3:25] + s[2] + s[26:40] + s[77] + s[41:77] + s[89] + s[78:81]
 963         elif len(s) == 89:
 964             return s[84:78:-1] + s[87] + s[77:60:-1] + s[0] + s[59:3:-1]
 965         elif len(s) == 88:
 966             return s[7:28] + s[87] + s[29:45] + s[55] + s[46:55] + s[2] + s[56:87] + s[28]
 967         elif len(s) == 87:
 968             return s[6:27] + s[4] + s[28:39] + s[27] + s[40:59] + s[2] + s[60:]
 969         elif len(s) == 86:
 970             return s[80:72:-1] + s[16] + s[71:39:-1] + s[72] + s[38:16:-1] + s[82] + s[15::-1]
 971         elif len(s) == 85:
 972             return s[3:11] + s[0] + s[12:55] + s[84] + s[56:84]
 973         elif len(s) == 84:
 974             return s[78:70:-1] + s[14] + s[69:37:-1] + s[70] + s[36:14:-1] + s[80] + s[:14][::-1]
 975         elif len(s) == 83:
 976             return s[80:63:-1] + s[0] + s[62:0:-1] + s[63]
 977         elif len(s) == 82:
 978             return s[80:37:-1] + s[7] + s[36:7:-1] + s[0] + s[6:0:-1] + s[37]
 979         elif len(s) == 81:
 980             return s[56] + s[79:56:-1] + s[41] + s[55:41:-1] + s[80] + s[40:34:-1] + s[0] + s[33:29:-1] + s[34] + s[28:9:-1] + s[29] + s[8:0:-1] + s[9]
 981         elif len(s) == 80:
 982             return s[1:19] + s[0] + s[20:68] + s[19] + s[69:80]
 983         elif len(s) == 79:
 984             return s[54] + s[77:54:-1] + s[39] + s[53:39:-1] + s[78] + s[38:34:-1] + s[0] + s[33:29:-1] + s[34] + s[28:9:-1] + s[29] + s[8:0:-1] + s[9]
 985
 986         else:
 987             raise ExtractorError(u'Unable to decrypt signature, key length %d not supported; retrying might work' % (len(s)))
 988
 989     def _get_available_subtitles(self, video_id, webpage):
 990         try:
 991             sub_list = self._download_webpage(
 992                 'http://video.google.com/timedtext?hl=en&type=list&v=%s' % video_id,
 993                 video_id, note=False)
 994         except ExtractorError as err:
 995             self._downloader.report_warning(u'unable to download video subtitles: %s' % compat_str(err))
 996             return {}
 997         lang_list = re.findall(r'name="([^"]*)"[^>]+lang_code="([\w\-]+)"', sub_list)
 998
 999         sub_lang_list = {}
1000         for l in lang_list:
1001             lang = l[1]
1002             params = compat_urllib_parse.urlencode({
1003                 'lang': lang,
1004                 'v': video_id,
1005                 'fmt': self._downloader.params.get('subtitlesformat', 'srt'),
1006                 'name': unescapeHTML(l[0]).encode('utf-8'),
1007             })
1008             url = u'http://www.youtube.com/api/timedtext?' + params
1009             sub_lang_list[lang] = url
1010         if not sub_lang_list:
1011             self._downloader.report_warning(u'video doesn\'t have subtitles')
1012             return {}
1013         return sub_lang_list
1014
1015     def _get_available_automatic_caption(self, video_id, webpage):
1016         """We need the webpage for getting the captions url, pass it as an
1017            argument to speed up the process."""
1018         sub_format = self._downloader.params.get('subtitlesformat', 'srt')
1019         self.to_screen(u'%s: Looking for automatic captions' % video_id)
1020         mobj = re.search(r';ytplayer.config = ({.*?});', webpage)
1021         err_msg = u'Couldn\'t find automatic captions for %s' % video_id
1022         if mobj is None:
1023             self._downloader.report_warning(err_msg)
1024             return {}
1025         player_config = json.loads(mobj.group(1))
1026         try:
1027             args = player_config[u'args']
1028             caption_url = args[u'ttsurl']
1029             timestamp = args[u'timestamp']
1030             # We get the available subtitles
1031             list_params = compat_urllib_parse.urlencode({
1032                 'type': 'list',
1033                 'tlangs': 1,
1034                 'asrs': 1,
1035             })
1036             list_url = caption_url + '&' + list_params
1037             caption_list = self._download_xml(list_url, video_id)
1038             original_lang_node = caption_list.find('track')
1039             if original_lang_node is None or original_lang_node.attrib.get('kind') != 'asr' :
1040                 self._downloader.report_warning(u'Video doesn\'t have automatic captions')
1041                 return {}
1042             original_lang = original_lang_node.attrib['lang_code']
1043
1044             sub_lang_list = {}
1045             for lang_node in caption_list.findall('target'):
1046                 sub_lang = lang_node.attrib['lang_code']
1047                 params = compat_urllib_parse.urlencode({
1048                     'lang': original_lang,
1049                     'tlang': sub_lang,
1050                     'fmt': sub_format,
1051                     'ts': timestamp,
1052                     'kind': 'asr',
1053                 })
1054                 sub_lang_list[sub_lang] = caption_url + '&' + params
1055             return sub_lang_list
1056         # An extractor error can be raise by the download process if there are
1057         # no automatic captions but there are subtitles
1058         except (KeyError, ExtractorError):
1059             self._downloader.report_warning(err_msg)
1060             return {}
1061
1062     def _extract_id(self, url):
1063         mobj = re.match(self._VALID_URL, url, re.VERBOSE)
1064         if mobj is None:
1065             raise ExtractorError(u'Invalid URL: %s' % url)
1066         video_id = mobj.group(2)
1067         return video_id
1068
1069     def _get_video_url_list(self, url_map):
1070         """
1071         Transform a dictionary in the format {itag:url} to a list of (itag, url)
1072         with the requested formats.
1073         """
1074         existing_formats = [x for x in self._formats if x in url_map]
1075         if len(existing_formats) == 0:
1076             raise ExtractorError(u'no known formats available for video')
1077         video_url_list = [(f, url_map[f]) for f in existing_formats] # All formats
1078         video_url_list.reverse() # order worst to best
1079         return video_url_list
1080
1081     def _extract_from_m3u8(self, manifest_url, video_id):
1082         url_map = {}
1083         def _get_urls(_manifest):
1084             lines = _manifest.split('\n')
1085             urls = filter(lambda l: l and not l.startswith('#'),
1086                             lines)
1087             return urls
1088         manifest = self._download_webpage(manifest_url, video_id, u'Downloading formats manifest')
1089         formats_urls = _get_urls(manifest)
1090         for format_url in formats_urls:
1091             itag = self._search_regex(r'itag/(\d+?)/', format_url, 'itag')
1092             url_map[itag] = format_url
1093         return url_map
1094
1095     def _extract_annotations(self, video_id):
1096         url = 'https://www.youtube.com/annotations_invideo?features=1&legacy=1&video_id=%s' % video_id
1097         return self._download_webpage(url, video_id, note=u'Searching for annotations.', errnote=u'Unable to download video annotations.')
1098
1099     def _real_extract(self, url):
1100         # Extract original video URL from URL with redirection, like age verification, using next_url parameter
1101         mobj = re.search(self._NEXT_URL_RE, url)
1102         if mobj:
1103             url = 'https://www.youtube.com/' + compat_urllib_parse.unquote(mobj.group(1)).lstrip('/')
1104         video_id = self._extract_id(url)
1105
1106         # Get video webpage
1107         url = 'https://www.youtube.com/watch?v=%s&gl=US&hl=en&has_verified=1' % video_id
1108         video_webpage = self._download_webpage(url, video_id)
1109
1110         # Attempt to extract SWF player URL
1111         mobj = re.search(r'swfConfig.*?"(https?:\\/\\/.*?watch.*?-.*?\.swf)"', video_webpage)
1112         if mobj is not None:
1113             player_url = re.sub(r'\\(.)', r'\1', mobj.group(1))
1114         else:
1115             player_url = None
1116
1117         # Get video info
1118         self.report_video_info_webpage_download(video_id)
1119         if re.search(r'player-age-gate-content">', video_webpage) is not None:
1120             self.report_age_confirmation()
1121             age_gate = True
1122             # We simulate the access to the video from www.youtube.com/v/{video_id}
1123             # this can be viewed without login into Youtube
1124             data = compat_urllib_parse.urlencode({'video_id': video_id,
1125                                                   'el': 'player_embedded',
1126                                                   'gl': 'US',
1127                                                   'hl': 'en',
1128                                                   'eurl': 'https://youtube.googleapis.com/v/' + video_id,
1129                                                   'asv': 3,
1130                                                   'sts':'1588',
1131                                                   })
1132             video_info_url = 'https://www.youtube.com/get_video_info?' + data
1133             video_info_webpage = self._download_webpage(video_info_url, video_id,
1134                                     note=False,
1135                                     errnote='unable to download video info webpage')
1136             video_info = compat_parse_qs(video_info_webpage)
1137         else:
1138             age_gate = False
1139             for el_type in ['&el=embedded', '&el=detailpage', '&el=vevo', '']:
1140                 video_info_url = ('https://www.youtube.com/get_video_info?&video_id=%s%s&ps=default&eurl=&gl=US&hl=en'
1141                         % (video_id, el_type))
1142                 video_info_webpage = self._download_webpage(video_info_url, video_id,
1143                                         note=False,
1144                                         errnote='unable to download video info webpage')
1145                 video_info = compat_parse_qs(video_info_webpage)
1146                 if 'token' in video_info:
1147                     break
1148         if 'token' not in video_info:
1149             if 'reason' in video_info:
1150                 raise ExtractorError(u'YouTube said: %s' % video_info['reason'][0], expected=True)
1151             else:
1152                 raise ExtractorError(u'"token" parameter not in video info for unknown reason')
1153
1154         if 'view_count' in video_info:
1155             view_count = int(video_info['view_count'][0])
1156         else:
1157             view_count = None
1158
1159         # Check for "rental" videos
1160         if 'ypc_video_rental_bar_text' in video_info and 'author' not in video_info:
1161             raise ExtractorError(u'"rental" videos not supported')
1162
1163         # Start extracting information
1164         self.report_information_extraction(video_id)
1165
1166         # uploader
1167         if 'author' not in video_info:
1168             raise ExtractorError(u'Unable to extract uploader name')
1169         video_uploader = compat_urllib_parse.unquote_plus(video_info['author'][0])
1170
1171         # uploader_id
1172         video_uploader_id = None
1173         mobj = re.search(r'<link itemprop="url" href="http://www.youtube.com/(?:user|channel)/([^"]+)">', video_webpage)
1174         if mobj is not None:
1175             video_uploader_id = mobj.group(1)
1176         else:
1177             self._downloader.report_warning(u'unable to extract uploader nickname')
1178
1179         # title
1180         if 'title' in video_info:
1181             video_title = compat_urllib_parse.unquote_plus(video_info['title'][0])
1182         else:
1183             self._downloader.report_warning(u'Unable to extract video title')
1184             video_title = u'_'
1185
1186         # thumbnail image
1187         # We try first to get a high quality image:
1188         m_thumb = re.search(r'<span itemprop="thumbnail".*?href="(.*?)">',
1189                             video_webpage, re.DOTALL)
1190         if m_thumb is not None:
1191             video_thumbnail = m_thumb.group(1)
1192         elif 'thumbnail_url' not in video_info:
1193             self._downloader.report_warning(u'unable to extract video thumbnail')
1194             video_thumbnail = None
1195         else:   # don't panic if we can't find it
1196             video_thumbnail = compat_urllib_parse.unquote_plus(video_info['thumbnail_url'][0])
1197
1198         # upload date
1199         upload_date = None
1200         mobj = re.search(r'id="eow-date.*?>(.*?)</span>', video_webpage, re.DOTALL)
1201         if mobj is not None:
1202             upload_date = ' '.join(re.sub(r'[/,-]', r' ', mobj.group(1)).split())
1203             upload_date = unified_strdate(upload_date)
1204
1205         # description
1206         video_description = get_element_by_id("eow-description", video_webpage)
1207         if video_description:
1208             video_description = re.sub(r'''(?x)
1209                 <a\s+
1210                     (?:[a-zA-Z-]+="[^"]+"\s+)*?
1211                     title="([^"]+)"\s+
1212                     (?:[a-zA-Z-]+="[^"]+"\s+)*?
1213                     class="yt-uix-redirect-link"\s*>
1214                 [^<]+
1215                 </a>
1216             ''', r'\1', video_description)
1217             video_description = clean_html(video_description)
1218         else:
1219             fd_mobj = re.search(r'<meta name="description" content="([^"]+)"', video_webpage)
1220             if fd_mobj:
1221                 video_description = unescapeHTML(fd_mobj.group(1))
1222             else:
1223                 video_description = u''
1224
1225         def _extract_count(klass):
1226             count = self._search_regex(
1227                 r'class="%s">([\d,]+)</span>' % re.escape(klass),
1228                 video_webpage, klass, default=None)
1229             if count is not None:
1230                 return int(count.replace(',', ''))
1231             return None
1232         like_count = _extract_count(u'likes-count')
1233         dislike_count = _extract_count(u'dislikes-count')
1234
1235         # subtitles
1236         video_subtitles = self.extract_subtitles(video_id, video_webpage)
1237
1238         if self._downloader.params.get('listsubtitles', False):
1239             self._list_available_subtitles(video_id, video_webpage)
1240             return
1241
1242         if 'length_seconds' not in video_info:
1243             self._downloader.report_warning(u'unable to extract video duration')
1244             video_duration = None
1245         else:
1246             video_duration = int(compat_urllib_parse.unquote_plus(video_info['length_seconds'][0]))
1247
1248         # annotations
1249         video_annotations = None
1250         if self._downloader.params.get('writeannotations', False):
1251                 video_annotations = self._extract_annotations(video_id)
1252
1253         # Decide which formats to download
1254
1255         try:
1256             mobj = re.search(r';ytplayer.config = ({.*?});', video_webpage)
1257             if not mobj:
1258                 raise ValueError('Could not find vevo ID')
1259             info = json.loads(mobj.group(1))
1260             args = info['args']
1261             # Easy way to know if the 's' value is in url_encoded_fmt_stream_map
1262             # this signatures are encrypted
1263             if 'url_encoded_fmt_stream_map' not in args:
1264                 raise ValueError(u'No stream_map present')  # caught below
1265             re_signature = re.compile(r'[&,]s=')
1266             m_s = re_signature.search(args['url_encoded_fmt_stream_map'])
1267             if m_s is not None:
1268                 self.to_screen(u'%s: Encrypted signatures detected.' % video_id)
1269                 video_info['url_encoded_fmt_stream_map'] = [args['url_encoded_fmt_stream_map']]
1270             m_s = re_signature.search(args.get('adaptive_fmts', u''))
1271             if m_s is not None:
1272                 if 'adaptive_fmts' in video_info:
1273                     video_info['adaptive_fmts'][0] += ',' + args['adaptive_fmts']
1274                 else:
1275                     video_info['adaptive_fmts'] = [args['adaptive_fmts']]
1276         except ValueError:
1277             pass
1278
1279         if 'conn' in video_info and video_info['conn'][0].startswith('rtmp'):
1280             self.report_rtmp_download()
1281             video_url_list = [('_rtmp', video_info['conn'][0])]
1282         elif len(video_info.get('url_encoded_fmt_stream_map', [])) >= 1 or len(video_info.get('adaptive_fmts', [])) >= 1:
1283             encoded_url_map = video_info.get('url_encoded_fmt_stream_map', [''])[0] + ',' + video_info.get('adaptive_fmts',[''])[0]
1284             if 'rtmpe%3Dyes' in encoded_url_map:
1285                 raise ExtractorError('rtmpe downloads are not supported, see https://github.com/rg3/youtube-dl/issues/343 for more information.', expected=True)
1286             url_map = {}
1287             for url_data_str in encoded_url_map.split(','):
1288                 url_data = compat_parse_qs(url_data_str)
1289                 if 'itag' in url_data and 'url' in url_data:
1290                     url = url_data['url'][0]
1291                     if 'sig' in url_data:
1292                         url += '&signature=' + url_data['sig'][0]
1293                     elif 's' in url_data:
1294                         encrypted_sig = url_data['s'][0]
1295                         if self._downloader.params.get('verbose'):
1296                             if age_gate:
1297                                 if player_url is None:
1298                                     player_version = 'unknown'
1299                                 else:
1300                                     player_version = self._search_regex(
1301                                         r'-(.+)\.swf$', player_url,
1302                                         u'flash player', fatal=False)
1303                                 player_desc = 'flash player %s' % player_version
1304                             else:
1305                                 player_version = self._search_regex(
1306                                     r'html5player-(.+?)\.js', video_webpage,
1307                                     'html5 player', fatal=False)
1308                                 player_desc = u'html5 player %s' % player_version
1309
1310                             parts_sizes = u'.'.join(compat_str(len(part)) for part in encrypted_sig.split('.'))
1311                             self.to_screen(u'encrypted signature length %d (%s), itag %s, %s' %
1312                                 (len(encrypted_sig), parts_sizes, url_data['itag'][0], player_desc))
1313
1314                         if not age_gate:
1315                             jsplayer_url_json = self._search_regex(
1316                                 r'"assets":.+?"js":\s*("[^"]+")',
1317                                 video_webpage, u'JS player URL')
1318                             player_url = json.loads(jsplayer_url_json)
1319
1320                         signature = self._decrypt_signature(
1321                             encrypted_sig, video_id, player_url, age_gate)
1322                         url += '&signature=' + signature
1323                     if 'ratebypass' not in url:
1324                         url += '&ratebypass=yes'
1325                     url_map[url_data['itag'][0]] = url
1326             video_url_list = self._get_video_url_list(url_map)
1327         elif video_info.get('hlsvp'):
1328             manifest_url = video_info['hlsvp'][0]
1329             url_map = self._extract_from_m3u8(manifest_url, video_id)
1330             video_url_list = self._get_video_url_list(url_map)
1331         else:
1332             raise ExtractorError(u'no conn, hlsvp or url_encoded_fmt_stream_map information found in video info')
1333
1334         formats = []
1335         for itag, video_real_url in video_url_list:
1336             dct = {
1337                 'format_id': itag,
1338                 'url': video_real_url,
1339                 'player_url': player_url,
1340             }
1341             dct.update(self._formats[itag])
1342             formats.append(dct)
1343
1344         self._sort_formats(formats)
1345
1346         return {
1347             'id':           video_id,
1348             'uploader':     video_uploader,
1349             'uploader_id':  video_uploader_id,
1350             'upload_date':  upload_date,
1351             'title':        video_title,
1352             'thumbnail':    video_thumbnail,
1353             'description':  video_description,
1354             'subtitles':    video_subtitles,
1355             'duration':     video_duration,
1356             'age_limit':    18 if age_gate else 0,
1357             'annotations':  video_annotations,
1358             'webpage_url': 'https://www.youtube.com/watch?v=%s' % video_id,
1359             'view_count':   view_count,
1360             'like_count': like_count,
1361             'dislike_count': dislike_count,
1362             'formats':      formats,
1363         }
1364
1365 class YoutubePlaylistIE(YoutubeBaseInfoExtractor):
1366     IE_DESC = u'YouTube.com playlists'
1367     _VALID_URL = r"""(?:
1368                         (?:https?://)?
1369                         (?:\w+\.)?
1370                         youtube\.com/
1371                         (?:
1372                            (?:course|view_play_list|my_playlists|artist|playlist|watch)
1373                            \? (?:.*?&)*? (?:p|a|list)=
1374                         |  p/
1375                         )
1376                         ((?:PL|EC|UU|FL|RD)?[0-9A-Za-z-_]{10,})
1377                         .*
1378                      |
1379                         ((?:PL|EC|UU|FL|RD)[0-9A-Za-z-_]{10,})
1380                      )"""
1381     _TEMPLATE_URL = 'https://www.youtube.com/playlist?list=%s&page=%s'
1382     _MORE_PAGES_INDICATOR = r'data-link-type="next"'
1383     _VIDEO_RE = r'href="/watch\?v=(?P<id>[0-9A-Za-z_-]{11})&amp;[^"]*?index=(?P<index>\d+)'
1384     IE_NAME = u'youtube:playlist'
1385
1386     @classmethod
1387     def suitable(cls, url):
1388         """Receives a URL and returns True if suitable for this IE."""
1389         return re.match(cls._VALID_URL, url, re.VERBOSE) is not None
1390
1391     def _real_initialize(self):
1392         self._login()
1393
1394     def _ids_to_results(self, ids):
1395         return [self.url_result(vid_id, 'Youtube', video_id=vid_id)
1396                        for vid_id in ids]
1397
1398     def _extract_mix(self, playlist_id):
1399         # The mixes are generated from a a single video
1400         # the id of the playlist is just 'RD' + video_id
1401         url = 'https://youtube.com/watch?v=%s&list=%s' % (playlist_id[-11:], playlist_id)
1402         webpage = self._download_webpage(url, playlist_id, u'Downloading Youtube mix')
1403         title_span = (get_element_by_attribute('class', 'title long-title', webpage) or
1404             get_element_by_attribute('class', 'title ', webpage))
1405         title = clean_html(title_span)
1406         video_re = r'data-index="\d+".*?href="/watch\?v=([0-9A-Za-z_-]{11})&amp;[^"]*?list=%s' % re.escape(playlist_id)
1407         ids = orderedSet(re.findall(video_re, webpage))
1408         url_results = self._ids_to_results(ids)
1409
1410         return self.playlist_result(url_results, playlist_id, title)
1411
1412     def _real_extract(self, url):
1413         # Extract playlist id
1414         mobj = re.match(self._VALID_URL, url, re.VERBOSE)
1415         if mobj is None:
1416             raise ExtractorError(u'Invalid URL: %s' % url)
1417         playlist_id = mobj.group(1) or mobj.group(2)
1418
1419         # Check if it's a video-specific URL
1420         query_dict = compat_urlparse.parse_qs(compat_urlparse.urlparse(url).query)
1421         if 'v' in query_dict:
1422             video_id = query_dict['v'][0]
1423             if self._downloader.params.get('noplaylist'):
1424                 self.to_screen(u'Downloading just video %s because of --no-playlist' % video_id)
1425                 return self.url_result(video_id, 'Youtube', video_id=video_id)
1426             else:
1427                 self.to_screen(u'Downloading playlist PL%s - add --no-playlist to just download video %s' % (playlist_id, video_id))
1428
1429         if playlist_id.startswith('RD'):
1430             # Mixes require a custom extraction process
1431             return self._extract_mix(playlist_id)
1432         if playlist_id.startswith('TL'):
1433             raise ExtractorError(u'For downloading YouTube.com top lists, use '
1434                 u'the "yttoplist" keyword, for example "youtube-dl \'yttoplist:music:Top Tracks\'"', expected=True)
1435
1436         # Extract the video ids from the playlist pages
1437         ids = []
1438
1439         for page_num in itertools.count(1):
1440             url = self._TEMPLATE_URL % (playlist_id, page_num)
1441             page = self._download_webpage(url, playlist_id, u'Downloading page #%s' % page_num)
1442             matches = re.finditer(self._VIDEO_RE, page)
1443             # We remove the duplicates and the link with index 0
1444             # (it's not the first video of the playlist)
1445             new_ids = orderedSet(m.group('id') for m in matches if m.group('index') != '0')
1446             ids.extend(new_ids)
1447
1448             if re.search(self._MORE_PAGES_INDICATOR, page) is None:
1449                 break
1450
1451         playlist_title = self._og_search_title(page)
1452
1453         url_results = self._ids_to_results(ids)
1454         return self.playlist_result(url_results, playlist_id, playlist_title)
1455
1456
1457 class YoutubeTopListIE(YoutubePlaylistIE):
1458     IE_NAME = u'youtube:toplist'
1459     IE_DESC = (u'YouTube.com top lists, "yttoplist:{channel}:{list title}"'
1460         u' (Example: "yttoplist:music:Top Tracks")')
1461     _VALID_URL = r'yttoplist:(?P<chann>.*?):(?P<title>.*?)$'
1462
1463     def _real_extract(self, url):
1464         mobj = re.match(self._VALID_URL, url)
1465         channel = mobj.group('chann')
1466         title = mobj.group('title')
1467         query = compat_urllib_parse.urlencode({'title': title})
1468         playlist_re = 'href="([^"]+?%s[^"]+?)"' % re.escape(query)
1469         channel_page = self._download_webpage('https://www.youtube.com/%s' % channel, title)
1470         link = self._html_search_regex(playlist_re, channel_page, u'list')
1471         url = compat_urlparse.urljoin('https://www.youtube.com/', link)
1472
1473         video_re = r'data-index="\d+".*?data-video-id="([0-9A-Za-z_-]{11})"'
1474         ids = []
1475         # sometimes the webpage doesn't contain the videos
1476         # retry until we get them
1477         for i in itertools.count(0):
1478             msg = u'Downloading Youtube mix'
1479             if i > 0:
1480                 msg += ', retry #%d' % i
1481             webpage = self._download_webpage(url, title, msg)
1482             ids = orderedSet(re.findall(video_re, webpage))
1483             if ids:
1484                 break
1485         url_results = self._ids_to_results(ids)
1486         return self.playlist_result(url_results, playlist_title=title)
1487
1488
1489 class YoutubeChannelIE(InfoExtractor):
1490     IE_DESC = u'YouTube.com channels'
1491     _VALID_URL = r"^(?:https?://)?(?:youtu\.be|(?:\w+\.)?youtube(?:-nocookie)?\.com)/channel/([0-9A-Za-z_-]+)"
1492     _MORE_PAGES_INDICATOR = 'yt-uix-load-more'
1493     _MORE_PAGES_URL = 'http://www.youtube.com/c4_browse_ajax?action_load_more_videos=1&flow=list&paging=%s&view=0&sort=da&channel_id=%s'
1494     IE_NAME = u'youtube:channel'
1495
1496     def extract_videos_from_page(self, page):
1497         ids_in_page = []
1498         for mobj in re.finditer(r'href="/watch\?v=([0-9A-Za-z_-]+)&?', page):
1499             if mobj.group(1) not in ids_in_page:
1500                 ids_in_page.append(mobj.group(1))
1501         return ids_in_page
1502
1503     def _real_extract(self, url):
1504         # Extract channel id
1505         mobj = re.match(self._VALID_URL, url)
1506         if mobj is None:
1507             raise ExtractorError(u'Invalid URL: %s' % url)
1508
1509         # Download channel page
1510         channel_id = mobj.group(1)
1511         video_ids = []
1512         url = 'https://www.youtube.com/channel/%s/videos' % channel_id
1513         channel_page = self._download_webpage(url, channel_id)
1514         autogenerated = re.search(r'''(?x)
1515                 class="[^"]*?(?:
1516                     channel-header-autogenerated-label|
1517                     yt-channel-title-autogenerated
1518                 )[^"]*"''', channel_page) is not None
1519
1520         if autogenerated:
1521             # The videos are contained in a single page
1522             # the ajax pages can't be used, they are empty
1523             video_ids = self.extract_videos_from_page(channel_page)
1524         else:
1525             # Download all channel pages using the json-based channel_ajax query
1526             for pagenum in itertools.count(1):
1527                 url = self._MORE_PAGES_URL % (pagenum, channel_id)
1528                 page = self._download_webpage(url, channel_id,
1529                                               u'Downloading page #%s' % pagenum)
1530
1531                 page = json.loads(page)
1532
1533                 ids_in_page = self.extract_videos_from_page(page['content_html'])
1534                 video_ids.extend(ids_in_page)
1535
1536                 if self._MORE_PAGES_INDICATOR not in page['load_more_widget_html']:
1537                     break
1538
1539         self._downloader.to_screen(u'[youtube] Channel %s: Found %i videos' % (channel_id, len(video_ids)))
1540
1541         url_entries = [self.url_result(video_id, 'Youtube', video_id=video_id)
1542                        for video_id in video_ids]
1543         return self.playlist_result(url_entries, channel_id)
1544
1545
1546 class YoutubeUserIE(InfoExtractor):
1547     IE_DESC = u'YouTube.com user videos (URL or "ytuser" keyword)'
1548     _VALID_URL = r'(?:(?:(?:https?://)?(?:\w+\.)?youtube\.com/(?:user/)?(?!(?:attribution_link|watch)(?:$|[^a-z_A-Z0-9-])))|ytuser:)(?!feed/)([A-Za-z0-9_-]+)'
1549     _TEMPLATE_URL = 'http://gdata.youtube.com/feeds/api/users/%s'
1550     _GDATA_PAGE_SIZE = 50
1551     _GDATA_URL = 'http://gdata.youtube.com/feeds/api/users/%s/uploads?max-results=%d&start-index=%d&alt=json'
1552     IE_NAME = u'youtube:user'
1553
1554     @classmethod
1555     def suitable(cls, url):
1556         # Don't return True if the url can be extracted with other youtube
1557         # extractor, the regex would is too permissive and it would match.
1558         other_ies = iter(klass for (name, klass) in globals().items() if name.endswith('IE') and klass is not cls)
1559         if any(ie.suitable(url) for ie in other_ies): return False
1560         else: return super(YoutubeUserIE, cls).suitable(url)
1561
1562     def _real_extract(self, url):
1563         # Extract username
1564         mobj = re.match(self._VALID_URL, url)
1565         if mobj is None:
1566             raise ExtractorError(u'Invalid URL: %s' % url)
1567
1568         username = mobj.group(1)
1569
1570         # Download video ids using YouTube Data API. Result size per
1571         # query is limited (currently to 50 videos) so we need to query
1572         # page by page until there are no video ids - it means we got
1573         # all of them.
1574
1575         url_results = []
1576
1577         for pagenum in itertools.count(0):
1578             start_index = pagenum * self._GDATA_PAGE_SIZE + 1
1579
1580             gdata_url = self._GDATA_URL % (username, self._GDATA_PAGE_SIZE, start_index)
1581             page = self._download_webpage(gdata_url, username,
1582                                           u'Downloading video ids from %d to %d' % (start_index, start_index + self._GDATA_PAGE_SIZE))
1583
1584             try:
1585                 response = json.loads(page)
1586             except ValueError as err:
1587                 raise ExtractorError(u'Invalid JSON in API response: ' + compat_str(err))
1588             if 'entry' not in response['feed']:
1589                 # Number of videos is a multiple of self._MAX_RESULTS
1590                 break
1591
1592             # Extract video identifiers
1593             entries = response['feed']['entry']
1594             for entry in entries:
1595                 title = entry['title']['$t']
1596                 video_id = entry['id']['$t'].split('/')[-1]
1597                 url_results.append({
1598                     '_type': 'url',
1599                     'url': video_id,
1600                     'ie_key': 'Youtube',
1601                     'id': 'video_id',
1602                     'title': title,
1603                 })
1604
1605             # A little optimization - if current page is not
1606             # "full", ie. does not contain PAGE_SIZE video ids then
1607             # we can assume that this page is the last one - there
1608             # are no more ids on further pages - no need to query
1609             # again.
1610
1611             if len(entries) < self._GDATA_PAGE_SIZE:
1612                 break
1613
1614         return self.playlist_result(url_results, playlist_title=username)
1615
1616
1617 class YoutubeSearchIE(SearchInfoExtractor):
1618     IE_DESC = u'YouTube.com searches'
1619     _API_URL = 'https://gdata.youtube.com/feeds/api/videos?q=%s&start-index=%i&max-results=50&v=2&alt=jsonc'
1620     _MAX_RESULTS = 1000
1621     IE_NAME = u'youtube:search'
1622     _SEARCH_KEY = 'ytsearch'
1623
1624     def _get_n_results(self, query, n):
1625         """Get a specified number of results for a query"""
1626
1627         video_ids = []
1628         pagenum = 0
1629         limit = n
1630
1631         while (50 * pagenum) < limit:
1632             result_url = self._API_URL % (compat_urllib_parse.quote_plus(query), (50*pagenum)+1)
1633             data_json = self._download_webpage(
1634                 result_url, video_id=u'query "%s"' % query,
1635                 note=u'Downloading page %s' % (pagenum + 1),
1636                 errnote=u'Unable to download API page')
1637             data = json.loads(data_json)
1638             api_response = data['data']
1639
1640             if 'items' not in api_response:
1641                 raise ExtractorError(u'[youtube] No video results')
1642
1643             new_ids = list(video['id'] for video in api_response['items'])
1644             video_ids += new_ids
1645
1646             limit = min(n, api_response['totalItems'])
1647             pagenum += 1
1648
1649         if len(video_ids) > n:
1650             video_ids = video_ids[:n]
1651         videos = [self.url_result(video_id, 'Youtube', video_id=video_id)
1652                   for video_id in video_ids]
1653         return self.playlist_result(videos, query)
1654
1655 class YoutubeSearchDateIE(YoutubeSearchIE):
1656     IE_NAME = YoutubeSearchIE.IE_NAME + ':date'
1657     _API_URL = 'https://gdata.youtube.com/feeds/api/videos?q=%s&start-index=%i&max-results=50&v=2&alt=jsonc&orderby=published'
1658     _SEARCH_KEY = 'ytsearchdate'
1659     IE_DESC = u'YouTube.com searches, newest videos first'
1660
1661 class YoutubeShowIE(InfoExtractor):
1662     IE_DESC = u'YouTube.com (multi-season) shows'
1663     _VALID_URL = r'https?://www\.youtube\.com/show/(.*)'
1664     IE_NAME = u'youtube:show'
1665
1666     def _real_extract(self, url):
1667         mobj = re.match(self._VALID_URL, url)
1668         show_name = mobj.group(1)
1669         webpage = self._download_webpage(url, show_name, u'Downloading show webpage')
1670         # There's one playlist for each season of the show
1671         m_seasons = list(re.finditer(r'href="(/playlist\?list=.*?)"', webpage))
1672         self.to_screen(u'%s: Found %s seasons' % (show_name, len(m_seasons)))
1673         return [self.url_result('https://www.youtube.com' + season.group(1), 'YoutubePlaylist') for season in m_seasons]
1674
1675
1676 class YoutubeFeedsInfoExtractor(YoutubeBaseInfoExtractor):
1677     """
1678     Base class for extractors that fetch info from
1679     http://www.youtube.com/feed_ajax
1680     Subclasses must define the _FEED_NAME and _PLAYLIST_TITLE properties.
1681     """
1682     _LOGIN_REQUIRED = True
1683     # use action_load_personal_feed instead of action_load_system_feed
1684     _PERSONAL_FEED = False
1685
1686     @property
1687     def _FEED_TEMPLATE(self):
1688         action = 'action_load_system_feed'
1689         if self._PERSONAL_FEED:
1690             action = 'action_load_personal_feed'
1691         return 'http://www.youtube.com/feed_ajax?%s=1&feed_name=%s&paging=%%s' % (action, self._FEED_NAME)
1692
1693     @property
1694     def IE_NAME(self):
1695         return u'youtube:%s' % self._FEED_NAME
1696
1697     def _real_initialize(self):
1698         self._login()
1699
1700     def _real_extract(self, url):
1701         feed_entries = []
1702         paging = 0
1703         for i in itertools.count(1):
1704             info = self._download_webpage(self._FEED_TEMPLATE % paging,
1705                                           u'%s feed' % self._FEED_NAME,
1706                                           u'Downloading page %s' % i)
1707             info = json.loads(info)
1708             feed_html = info['feed_html']
1709             m_ids = re.finditer(r'"/watch\?v=(.*?)["&]', feed_html)
1710             ids = orderedSet(m.group(1) for m in m_ids)
1711             feed_entries.extend(
1712                 self.url_result(video_id, 'Youtube', video_id=video_id)
1713                 for video_id in ids)
1714             if info['paging'] is None:
1715                 break
1716             paging = info['paging']
1717         return self.playlist_result(feed_entries, playlist_title=self._PLAYLIST_TITLE)
1718
1719 class YoutubeSubscriptionsIE(YoutubeFeedsInfoExtractor):
1720     IE_DESC = u'YouTube.com subscriptions feed, "ytsubs" keyword(requires authentication)'
1721     _VALID_URL = r'https?://www\.youtube\.com/feed/subscriptions|:ytsubs(?:criptions)?'
1722     _FEED_NAME = 'subscriptions'
1723     _PLAYLIST_TITLE = u'Youtube Subscriptions'
1724
1725 class YoutubeRecommendedIE(YoutubeFeedsInfoExtractor):
1726     IE_DESC = u'YouTube.com recommended videos, "ytrec" keyword (requires authentication)'
1727     _VALID_URL = r'https?://www\.youtube\.com/feed/recommended|:ytrec(?:ommended)?'
1728     _FEED_NAME = 'recommended'
1729     _PLAYLIST_TITLE = u'Youtube Recommended videos'
1730
1731 class YoutubeWatchLaterIE(YoutubeFeedsInfoExtractor):
1732     IE_DESC = u'Youtube watch later list, "ytwatchlater" keyword (requires authentication)'
1733     _VALID_URL = r'https?://www\.youtube\.com/feed/watch_later|:ytwatchlater'
1734     _FEED_NAME = 'watch_later'
1735     _PLAYLIST_TITLE = u'Youtube Watch Later'
1736     _PERSONAL_FEED = True
1737
1738 class YoutubeHistoryIE(YoutubeFeedsInfoExtractor):
1739     IE_DESC = u'Youtube watch history, "ythistory" keyword (requires authentication)'
1740     _VALID_URL = u'https?://www\.youtube\.com/feed/history|:ythistory'
1741     _FEED_NAME = 'history'
1742     _PERSONAL_FEED = True
1743     _PLAYLIST_TITLE = u'Youtube Watch History'
1744
1745 class YoutubeFavouritesIE(YoutubeBaseInfoExtractor):
1746     IE_NAME = u'youtube:favorites'
1747     IE_DESC = u'YouTube.com favourite videos, "ytfav" keyword (requires authentication)'
1748     _VALID_URL = r'https?://www\.youtube\.com/my_favorites|:ytfav(?:ou?rites)?'
1749     _LOGIN_REQUIRED = True
1750
1751     def _real_extract(self, url):
1752         webpage = self._download_webpage('https://www.youtube.com/my_favorites', 'Youtube Favourites videos')
1753         playlist_id = self._search_regex(r'list=(.+?)["&]', webpage, u'favourites playlist id')
1754         return self.url_result(playlist_id, 'YoutubePlaylist')
1755
1756
1757 class YoutubeTruncatedURLIE(InfoExtractor):
1758     IE_NAME = 'youtube:truncated_url'
1759     IE_DESC = False  # Do not list
1760     _VALID_URL = r'(?:https?://)?[^/]+/watch\?feature=[a-z_]+$'
1761
1762     def _real_extract(self, url):
1763         raise ExtractorError(
1764             u'Did you forget to quote the URL? Remember that & is a meta '
1765             u'character in most shells, so you want to put the URL in quotes, '
1766             u'like  youtube-dl '
1767             u'"http://www.youtube.com/watch?feature=foo&v=BaW_jenozKc" '
1768             u' or simply  youtube-dl BaW_jenozKc  .',
1769             expected=True)