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