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     int_or_none,
  31     PagedList,
  32     RegexNotFoundError,
  33     unescapeHTML,
  34     unified_strdate,
  35     orderedSet,
  36     write_json_file,
  37 )
  38
  39 class YoutubeBaseInfoExtractor(InfoExtractor):
  40     """Provide base functions for Youtube extractors"""
  41     _LOGIN_URL = 'https://accounts.google.com/ServiceLogin'
  42     _LANG_URL = r'https://www.youtube.com/?hl=en&persist_hl=1&gl=US&persist_gl=1&opt_out_ackd=1'
  43     _AGE_URL = 'http://www.youtube.com/verify_age?next_url=/&gl=US&hl=en'
  44     _NETRC_MACHINE = 'youtube'
  45     # If True it will raise an error if no login info is provided
  46     _LOGIN_REQUIRED = False
  47
  48     def _set_language(self):
  49         return bool(self._download_webpage(
  50             self._LANG_URL, None,
  51             note=u'Setting language', errnote='unable to set language',
  52             fatal=False))
  53
  54     def _login(self):
  55         (username, password) = self._get_login_info()
  56         # No authentication to be performed
  57         if username is None:
  58             if self._LOGIN_REQUIRED:
  59                 raise ExtractorError(u'No login info available, needed for using %s.' % self.IE_NAME, expected=True)
  60             return False
  61
  62         login_page = self._download_webpage(
  63             self._LOGIN_URL, None,
  64             note=u'Downloading login page',
  65             errnote=u'unable to fetch login page', fatal=False)
  66         if login_page is False:
  67             return
  68
  69         galx = self._search_regex(r'(?s)<input.+?name="GALX".+?value="(.+?)"',
  70                                   login_page, u'Login GALX parameter')
  71
  72         # Log in
  73         login_form_strs = {
  74                 u'continue': u'https://www.youtube.com/signin?action_handle_signin=true&feature=sign_in_button&hl=en_US&nomobiletemp=1',
  75                 u'Email': username,
  76                 u'GALX': galx,
  77                 u'Passwd': password,
  78                 u'PersistentCookie': u'yes',
  79                 u'_utf8': u'霱',
  80                 u'bgresponse': u'js_disabled',
  81                 u'checkConnection': u'',
  82                 u'checkedDomains': u'youtube',
  83                 u'dnConn': u'',
  84                 u'pstMsg': u'0',
  85                 u'rmShown': u'1',
  86                 u'secTok': u'',
  87                 u'signIn': u'Sign in',
  88                 u'timeStmp': u'',
  89                 u'service': u'youtube',
  90                 u'uilel': u'3',
  91                 u'hl': u'en_US',
  92         }
  93         # Convert to UTF-8 *before* urlencode because Python 2.x's urlencode
  94         # chokes on unicode
  95         login_form = dict((k.encode('utf-8'), v.encode('utf-8')) for k,v in login_form_strs.items())
  96         login_data = compat_urllib_parse.urlencode(login_form).encode('ascii')
  97
  98         req = compat_urllib_request.Request(self._LOGIN_URL, login_data)
  99         login_results = self._download_webpage(
 100             req, None,
 101             note=u'Logging in', errnote=u'unable to log in', fatal=False)
 102         if login_results is False:
 103             return False
 104         if re.search(r'(?i)<form[^>]* id="gaia_loginform"', login_results) is not None:
 105             self._downloader.report_warning(u'unable to log in: bad username or password')
 106             return False
 107         return True
 108
 109     def _confirm_age(self):
 110         age_form = {
 111             'next_url': '/',
 112             'action_confirm': 'Confirm',
 113         }
 114         req = compat_urllib_request.Request(self._AGE_URL, compat_urllib_parse.urlencode(age_form))
 115
 116         self._download_webpage(
 117             req, None,
 118             note=u'Confirming age', errnote=u'Unable to confirm age')
 119         return True
 120
 121     def _real_initialize(self):
 122         if self._downloader is None:
 123             return
 124         if not self._set_language():
 125             return
 126         if not self._login():
 127             return
 128         self._confirm_age()
 129
 130
 131 class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
 132     IE_DESC = u'YouTube.com'
 133     _VALID_URL = r"""(?x)^
 134                      (
 135                          (?:https?://|//)?                                    # http(s):// or protocol-independent URL (optional)
 136                          (?:(?:(?:(?:\w+\.)?[yY][oO][uU][tT][uU][bB][eE](?:-nocookie)?\.com/|
 137                             (?:www\.)?deturl\.com/www\.youtube\.com/|
 138                             (?:www\.)?pwnyoutube\.com|
 139                             tube\.majestyc\.net/|
 140                             youtube\.googleapis\.com/)                        # the various hostnames, with wildcard subdomains
 141                          (?:.*?\#/)?                                          # handle anchor (#/) redirect urls
 142                          (?:                                                  # the various things that can precede the ID:
 143                              (?:(?:v|embed|e)/)                               # v/ or embed/ or e/
 144                              |(?:                                             # or the v= param in all its forms
 145                                  (?:(?:watch|movie)(?:_popup)?(?:\.php)?)?    # preceding watch(_popup|.php) or nothing (like /?v=xxxx)
 146                                  (?:\?|\#!?)                                  # the params delimiter ? or # or #!
 147                                  (?:.*?&)?                                    # any other preceding param (like /?s=tuff&v=xxxx)
 148                                  v=
 149                              )
 150                          ))
 151                          |youtu\.be/                                          # just youtu.be/xxxx
 152                          )
 153                      )?                                                       # all until now is optional -> you can pass the naked ID
 154                      ([0-9A-Za-z_-]{11})                                      # here is it! the YouTube video ID
 155                      (?(1).+)?                                                # if we found the ID, everything can follow
 156                      $"""
 157     _NEXT_URL_RE = r'[\?&]next_url=([^&]+)'
 158     _formats = {
 159         '5': {'ext': 'flv', 'width': 400, 'height': 240},
 160         '6': {'ext': 'flv', 'width': 450, 'height': 270},
 161         '13': {'ext': '3gp'},
 162         '17': {'ext': '3gp', 'width': 176, 'height': 144},
 163         '18': {'ext': 'mp4', 'width': 640, 'height': 360},
 164         '22': {'ext': 'mp4', 'width': 1280, 'height': 720},
 165         '34': {'ext': 'flv', 'width': 640, 'height': 360},
 166         '35': {'ext': 'flv', 'width': 854, 'height': 480},
 167         '36': {'ext': '3gp', 'width': 320, 'height': 240},
 168         '37': {'ext': 'mp4', 'width': 1920, 'height': 1080},
 169         '38': {'ext': 'mp4', 'width': 4096, 'height': 3072},
 170         '43': {'ext': 'webm', 'width': 640, 'height': 360},
 171         '44': {'ext': 'webm', 'width': 854, 'height': 480},
 172         '45': {'ext': 'webm', 'width': 1280, 'height': 720},
 173         '46': {'ext': 'webm', 'width': 1920, 'height': 1080},
 174
 175
 176         # 3d videos
 177         '82': {'ext': 'mp4', 'height': 360, 'resolution': '360p', 'format_note': '3D', 'preference': -20},
 178         '83': {'ext': 'mp4', 'height': 480, 'resolution': '480p', 'format_note': '3D', 'preference': -20},
 179         '84': {'ext': 'mp4', 'height': 720, 'resolution': '720p', 'format_note': '3D', 'preference': -20},
 180         '85': {'ext': 'mp4', 'height': 1080, 'resolution': '1080p', 'format_note': '3D', 'preference': -20},
 181         '100': {'ext': 'webm', 'height': 360, 'resolution': '360p', 'format_note': '3D', 'preference': -20},
 182         '101': {'ext': 'webm', 'height': 480, 'resolution': '480p', 'format_note': '3D', 'preference': -20},
 183         '102': {'ext': 'webm', 'height': 720, 'resolution': '720p', 'format_note': '3D', 'preference': -20},
 184
 185         # Apple HTTP Live Streaming
 186         '92': {'ext': 'mp4', 'height': 240, 'resolution': '240p', 'format_note': 'HLS', 'preference': -10},
 187         '93': {'ext': 'mp4', 'height': 360, 'resolution': '360p', 'format_note': 'HLS', 'preference': -10},
 188         '94': {'ext': 'mp4', 'height': 480, 'resolution': '480p', 'format_note': 'HLS', 'preference': -10},
 189         '95': {'ext': 'mp4', 'height': 720, 'resolution': '720p', 'format_note': 'HLS', 'preference': -10},
 190         '96': {'ext': 'mp4', 'height': 1080, 'resolution': '1080p', 'format_note': 'HLS', 'preference': -10},
 191         '132': {'ext': 'mp4', 'height': 240, 'resolution': '240p', 'format_note': 'HLS', 'preference': -10},
 192         '151': {'ext': 'mp4', 'height': 72, 'resolution': '72p', 'format_note': 'HLS', 'preference': -10},
 193
 194         # DASH mp4 video
 195         '133': {'ext': 'mp4', 'height': 240, 'resolution': '240p', 'format_note': 'DASH video', 'preference': -40},
 196         '134': {'ext': 'mp4', 'height': 360, 'resolution': '360p', 'format_note': 'DASH video', 'preference': -40},
 197         '135': {'ext': 'mp4', 'height': 480, 'resolution': '480p', 'format_note': 'DASH video', 'preference': -40},
 198         '136': {'ext': 'mp4', 'height': 720, 'resolution': '720p', 'format_note': 'DASH video', 'preference': -40},
 199         '137': {'ext': 'mp4', 'height': 1080, 'resolution': '1080p', 'format_note': 'DASH video', 'preference': -40},
 200         '138': {'ext': 'mp4', 'height': 1081, 'resolution': '>1080p', 'format_note': 'DASH video', 'preference': -40},
 201         '160': {'ext': 'mp4', 'height': 192, 'resolution': '192p', 'format_note': 'DASH video', 'preference': -40},
 202         '264': {'ext': 'mp4', 'height': 1080, 'resolution': '1080p', 'format_note': 'DASH video', 'preference': -40},
 203
 204         # Dash mp4 audio
 205         '139': {'ext': 'm4a', 'format_note': 'DASH audio', 'vcodec': 'none', 'abr': 48, 'preference': -50},
 206         '140': {'ext': 'm4a', 'format_note': 'DASH audio', 'vcodec': 'none', 'abr': 128, 'preference': -50},
 207         '141': {'ext': 'm4a', 'format_note': 'DASH audio', 'vcodec': 'none', 'abr': 256, 'preference': -50},
 208
 209         # Dash webm
 210         '242': {'ext': 'webm', 'height': 240, 'resolution': '240p', 'format_note': 'DASH webm', 'preference': -40},
 211         '243': {'ext': 'webm', 'height': 360, 'resolution': '360p', 'format_note': 'DASH webm', 'preference': -40},
 212         '244': {'ext': 'webm', 'height': 480, 'resolution': '480p', 'format_note': 'DASH webm', 'preference': -40},
 213         '245': {'ext': 'webm', 'height': 480, 'resolution': '480p', 'format_note': 'DASH webm', 'preference': -40},
 214         '246': {'ext': 'webm', 'height': 480, 'resolution': '480p', 'format_note': 'DASH webm', 'preference': -40},
 215         '247': {'ext': 'webm', 'height': 720, 'resolution': '720p', 'format_note': 'DASH webm', 'preference': -40},
 216         '248': {'ext': 'webm', 'height': 1080, 'resolution': '1080p', 'format_note': 'DASH webm', 'preference': -40},
 217
 218         # Dash webm audio
 219         '171': {'ext': 'webm', 'vcodec': 'none', 'format_note': 'DASH webm audio', 'abr': 48, 'preference': -50},
 220         '172': {'ext': 'webm', 'vcodec': 'none', 'format_note': 'DASH webm audio', 'abr': 256, 'preference': -50},
 221
 222         # RTMP (unnamed)
 223         '_rtmp': {'protocol': 'rtmp'},
 224     }
 225
 226     IE_NAME = u'youtube'
 227     _TESTS = [
 228         {
 229             u"url":  u"http://www.youtube.com/watch?v=BaW_jenozKc",
 230             u"file":  u"BaW_jenozKc.mp4",
 231             u"info_dict": {
 232                 u"title": u"youtube-dl test video \"'/\\ä↭𝕐",
 233                 u"uploader": u"Philipp Hagemeister",
 234                 u"uploader_id": u"phihag",
 235                 u"upload_date": u"20121002",
 236                 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 ."
 237             }
 238         },
 239         {
 240             u"url":  u"http://www.youtube.com/watch?v=UxxajLWwzqY",
 241             u"file":  u"UxxajLWwzqY.mp4",
 242             u"note": u"Test generic use_cipher_signature video (#897)",
 243             u"info_dict": {
 244                 u"upload_date": u"20120506",
 245                 u"title": u"Icona Pop - I Love It (feat. Charli XCX) [OFFICIAL VIDEO]",
 246                 u"description": u"md5:5b292926389560516e384ac437c0ec07",
 247                 u"uploader": u"Icona Pop",
 248                 u"uploader_id": u"IconaPop"
 249             }
 250         },
 251         {
 252             u"url":  u"https://www.youtube.com/watch?v=07FYdnEawAQ",
 253             u"file":  u"07FYdnEawAQ.mp4",
 254             u"note": u"Test VEVO video with age protection (#956)",
 255             u"info_dict": {
 256                 u"upload_date": u"20130703",
 257                 u"title": u"Justin Timberlake - Tunnel Vision (Explicit)",
 258                 u"description": u"md5:64249768eec3bc4276236606ea996373",
 259                 u"uploader": u"justintimberlakeVEVO",
 260                 u"uploader_id": u"justintimberlakeVEVO"
 261             }
 262         },
 263         {
 264             u"url":  u"//www.YouTube.com/watch?v=yZIXLfi8CZQ",
 265             u"file":  u"yZIXLfi8CZQ.mp4",
 266             u"note": u"Embed-only video (#1746)",
 267             u"info_dict": {
 268                 u"upload_date": u"20120608",
 269                 u"title": u"Principal Sexually Assaults A Teacher - Episode 117 - 8th June 2012",
 270                 u"description": u"md5:09b78bd971f1e3e289601dfba15ca4f7",
 271                 u"uploader": u"SET India",
 272                 u"uploader_id": u"setindia"
 273             }
 274         },
 275         {
 276             u"url": u"http://www.youtube.com/watch?v=a9LDPn-MO4I",
 277             u"file": u"a9LDPn-MO4I.m4a",
 278             u"note": u"256k DASH audio (format 141) via DASH manifest",
 279             u"info_dict": {
 280                 u"upload_date": "20121002",
 281                 u"uploader_id": "8KVIDEO",
 282                 u"description": "No description available.",
 283                 u"uploader": "8KVIDEO",
 284                 u"title": "UHDTV TEST 8K VIDEO.mp4"
 285             },
 286             u"params": {
 287                 u"youtube_include_dash_manifest": True,
 288                 u"format": "141",
 289             },
 290         },
 291     ]
 292
 293
 294     @classmethod
 295     def suitable(cls, url):
 296         """Receives a URL and returns True if suitable for this IE."""
 297         if YoutubePlaylistIE.suitable(url): return False
 298         return re.match(cls._VALID_URL, url) is not None
 299
 300     def __init__(self, *args, **kwargs):
 301         super(YoutubeIE, self).__init__(*args, **kwargs)
 302         self._player_cache = {}
 303
 304     def report_video_info_webpage_download(self, video_id):
 305         """Report attempt to download video info webpage."""
 306         self.to_screen(u'%s: Downloading video info webpage' % video_id)
 307
 308     def report_information_extraction(self, video_id):
 309         """Report attempt to extract video information."""
 310         self.to_screen(u'%s: Extracting video information' % video_id)
 311
 312     def report_unavailable_format(self, video_id, format):
 313         """Report extracted video URL."""
 314         self.to_screen(u'%s: Format %s not available' % (video_id, format))
 315
 316     def report_rtmp_download(self):
 317         """Indicate the download will use the RTMP protocol."""
 318         self.to_screen(u'RTMP download detected')
 319
 320     def _extract_signature_function(self, video_id, player_url, slen):
 321         id_m = re.match(r'.*-(?P<id>[a-zA-Z0-9_-]+)\.(?P<ext>[a-z]+)$',
 322                         player_url)
 323         player_type = id_m.group('ext')
 324         player_id = id_m.group('id')
 325
 326         # Read from filesystem cache
 327         func_id = '%s_%s_%d' % (player_type, player_id, slen)
 328         assert os.path.basename(func_id) == func_id
 329         cache_dir = get_cachedir(self._downloader.params)
 330
 331         cache_enabled = cache_dir is not None
 332         if cache_enabled:
 333             cache_fn = os.path.join(os.path.expanduser(cache_dir),
 334                                     u'youtube-sigfuncs',
 335                                     func_id + '.json')
 336             try:
 337                 with io.open(cache_fn, 'r', encoding='utf-8') as cachef:
 338                     cache_spec = json.load(cachef)
 339                 return lambda s: u''.join(s[i] for i in cache_spec)
 340             except IOError:
 341                 pass  # No cache available
 342
 343         if player_type == 'js':
 344             code = self._download_webpage(
 345                 player_url, video_id,
 346                 note=u'Downloading %s player %s' % (player_type, player_id),
 347                 errnote=u'Download of %s failed' % player_url)
 348             res = self._parse_sig_js(code)
 349         elif player_type == 'swf':
 350             urlh = self._request_webpage(
 351                 player_url, video_id,
 352                 note=u'Downloading %s player %s' % (player_type, player_id),
 353                 errnote=u'Download of %s failed' % player_url)
 354             code = urlh.read()
 355             res = self._parse_sig_swf(code)
 356         else:
 357             assert False, 'Invalid player type %r' % player_type
 358
 359         if cache_enabled:
 360             try:
 361                 test_string = u''.join(map(compat_chr, range(slen)))
 362                 cache_res = res(test_string)
 363                 cache_spec = [ord(c) for c in cache_res]
 364                 try:
 365                     os.makedirs(os.path.dirname(cache_fn))
 366                 except OSError as ose:
 367                     if ose.errno != errno.EEXIST:
 368                         raise
 369                 write_json_file(cache_spec, cache_fn)
 370             except Exception:
 371                 tb = traceback.format_exc()
 372                 self._downloader.report_warning(
 373                     u'Writing cache to %r failed: %s' % (cache_fn, tb))
 374
 375         return res
 376
 377     def _print_sig_code(self, func, slen):
 378         def gen_sig_code(idxs):
 379             def _genslice(start, end, step):
 380                 starts = u'' if start == 0 else str(start)
 381                 ends = (u':%d' % (end+step)) if end + step >= 0 else u':'
 382                 steps = u'' if step == 1 else (u':%d' % step)
 383                 return u's[%s%s%s]' % (starts, ends, steps)
 384
 385             step = None
 386             start = '(Never used)'  # Quelch pyflakes warnings - start will be
 387                                     # set as soon as step is set
 388             for i, prev in zip(idxs[1:], idxs[:-1]):
 389                 if step is not None:
 390                     if i - prev == step:
 391                         continue
 392                     yield _genslice(start, prev, step)
 393                     step = None
 394                     continue
 395                 if i - prev in [-1, 1]:
 396                     step = i - prev
 397                     start = prev
 398                     continue
 399                 else:
 400                     yield u's[%d]' % prev
 401             if step is None:
 402                 yield u's[%d]' % i
 403             else:
 404                 yield _genslice(start, i, step)
 405
 406         test_string = u''.join(map(compat_chr, range(slen)))
 407         cache_res = func(test_string)
 408         cache_spec = [ord(c) for c in cache_res]
 409         expr_code = u' + '.join(gen_sig_code(cache_spec))
 410         code = u'if len(s) == %d:\n    return %s\n' % (slen, expr_code)
 411         self.to_screen(u'Extracted signature function:\n' + code)
 412
 413     def _parse_sig_js(self, jscode):
 414         funcname = self._search_regex(
 415             r'signature=([a-zA-Z]+)', jscode,
 416             u'Initial JS player signature function name')
 417
 418         functions = {}
 419
 420         def argidx(varname):
 421             return string.lowercase.index(varname)
 422
 423         def interpret_statement(stmt, local_vars, allow_recursion=20):
 424             if allow_recursion < 0:
 425                 raise ExtractorError(u'Recursion limit reached')
 426
 427             if stmt.startswith(u'var '):
 428                 stmt = stmt[len(u'var '):]
 429             ass_m = re.match(r'^(?P<out>[a-z]+)(?:\[(?P<index>[^\]]+)\])?' +
 430                              r'=(?P<expr>.*)$', stmt)
 431             if ass_m:
 432                 if ass_m.groupdict().get('index'):
 433                     def assign(val):
 434                         lvar = local_vars[ass_m.group('out')]
 435                         idx = interpret_expression(ass_m.group('index'),
 436                                                    local_vars, allow_recursion)
 437                         assert isinstance(idx, int)
 438                         lvar[idx] = val
 439                         return val
 440                     expr = ass_m.group('expr')
 441                 else:
 442                     def assign(val):
 443                         local_vars[ass_m.group('out')] = val
 444                         return val
 445                     expr = ass_m.group('expr')
 446             elif stmt.startswith(u'return '):
 447                 assign = lambda v: v
 448                 expr = stmt[len(u'return '):]
 449             else:
 450                 raise ExtractorError(
 451                     u'Cannot determine left side of statement in %r' % stmt)
 452
 453             v = interpret_expression(expr, local_vars, allow_recursion)
 454             return assign(v)
 455
 456         def interpret_expression(expr, local_vars, allow_recursion):
 457             if expr.isdigit():
 458                 return int(expr)
 459
 460             if expr.isalpha():
 461                 return local_vars[expr]
 462
 463             m = re.match(r'^(?P<in>[a-z]+)\.(?P<member>.*)$', expr)
 464             if m:
 465                 member = m.group('member')
 466                 val = local_vars[m.group('in')]
 467                 if member == 'split("")':
 468                     return list(val)
 469                 if member == 'join("")':
 470                     return u''.join(val)
 471                 if member == 'length':
 472                     return len(val)
 473                 if member == 'reverse()':
 474                     return val[::-1]
 475                 slice_m = re.match(r'slice\((?P<idx>.*)\)', member)
 476                 if slice_m:
 477                     idx = interpret_expression(
 478                         slice_m.group('idx'), local_vars, allow_recursion-1)
 479                     return val[idx:]
 480
 481             m = re.match(
 482                 r'^(?P<in>[a-z]+)\[(?P<idx>.+)\]$', expr)
 483             if m:
 484                 val = local_vars[m.group('in')]
 485                 idx = interpret_expression(m.group('idx'), local_vars,
 486                                            allow_recursion-1)
 487                 return val[idx]
 488
 489             m = re.match(r'^(?P<a>.+?)(?P<op>[%])(?P<b>.+?)$', expr)
 490             if m:
 491                 a = interpret_expression(m.group('a'),
 492                                          local_vars, allow_recursion)
 493                 b = interpret_expression(m.group('b'),
 494                                          local_vars, allow_recursion)
 495                 return a % b
 496
 497             m = re.match(
 498                 r'^(?P<func>[a-zA-Z]+)\((?P<args>[a-z0-9,]+)\)$', expr)
 499             if m:
 500                 fname = m.group('func')
 501                 if fname not in functions:
 502                     functions[fname] = extract_function(fname)
 503                 argvals = [int(v) if v.isdigit() else local_vars[v]
 504                            for v in m.group('args').split(',')]
 505                 return functions[fname](argvals)
 506             raise ExtractorError(u'Unsupported JS expression %r' % expr)
 507
 508         def extract_function(funcname):
 509             func_m = re.search(
 510                 r'function ' + re.escape(funcname) +
 511                 r'\((?P<args>[a-z,]+)\){(?P<code>[^}]+)}',
 512                 jscode)
 513             argnames = func_m.group('args').split(',')
 514
 515             def resf(args):
 516                 local_vars = dict(zip(argnames, args))
 517                 for stmt in func_m.group('code').split(';'):
 518                     res = interpret_statement(stmt, local_vars)
 519                 return res
 520             return resf
 521
 522         initial_function = extract_function(funcname)
 523         return lambda s: initial_function([s])
 524
 525     def _parse_sig_swf(self, file_contents):
 526         if file_contents[1:3] != b'WS':
 527             raise ExtractorError(
 528                 u'Not an SWF file; header is %r' % file_contents[:3])
 529         if file_contents[:1] == b'C':
 530             content = zlib.decompress(file_contents[8:])
 531         else:
 532             raise NotImplementedError(u'Unsupported compression format %r' %
 533                                       file_contents[:1])
 534
 535         def extract_tags(content):
 536             pos = 0
 537             while pos < len(content):
 538                 header16 = struct.unpack('<H', content[pos:pos+2])[0]
 539                 pos += 2
 540                 tag_code = header16 >> 6
 541                 tag_len = header16 & 0x3f
 542                 if tag_len == 0x3f:
 543                     tag_len = struct.unpack('<I', content[pos:pos+4])[0]
 544                     pos += 4
 545                 assert pos+tag_len <= len(content)
 546                 yield (tag_code, content[pos:pos+tag_len])
 547                 pos += tag_len
 548
 549         code_tag = next(tag
 550                         for tag_code, tag in extract_tags(content)
 551                         if tag_code == 82)
 552         p = code_tag.index(b'\0', 4) + 1
 553         code_reader = io.BytesIO(code_tag[p:])
 554
 555         # Parse ABC (AVM2 ByteCode)
 556         def read_int(reader=None):
 557             if reader is None:
 558                 reader = code_reader
 559             res = 0
 560             shift = 0
 561             for _ in range(5):
 562                 buf = reader.read(1)
 563                 assert len(buf) == 1
 564                 b = struct.unpack('<B', buf)[0]
 565                 res = res | ((b & 0x7f) << shift)
 566                 if b & 0x80 == 0:
 567                     break
 568                 shift += 7
 569             return res
 570
 571         def u30(reader=None):
 572             res = read_int(reader)
 573             assert res & 0xf0000000 == 0
 574             return res
 575         u32 = read_int
 576
 577         def s32(reader=None):
 578             v = read_int(reader)
 579             if v & 0x80000000 != 0:
 580                 v = - ((v ^ 0xffffffff) + 1)
 581             return v
 582
 583         def read_string(reader=None):
 584             if reader is None:
 585                 reader = code_reader
 586             slen = u30(reader)
 587             resb = reader.read(slen)
 588             assert len(resb) == slen
 589             return resb.decode('utf-8')
 590
 591         def read_bytes(count, reader=None):
 592             if reader is None:
 593                 reader = code_reader
 594             resb = reader.read(count)
 595             assert len(resb) == count
 596             return resb
 597
 598         def read_byte(reader=None):
 599             resb = read_bytes(1, reader=reader)
 600             res = struct.unpack('<B', resb)[0]
 601             return res
 602
 603         # minor_version + major_version
 604         read_bytes(2 + 2)
 605
 606         # Constant pool
 607         int_count = u30()
 608         for _c in range(1, int_count):
 609             s32()
 610         uint_count = u30()
 611         for _c in range(1, uint_count):
 612             u32()
 613         double_count = u30()
 614         read_bytes((double_count-1) * 8)
 615         string_count = u30()
 616         constant_strings = [u'']
 617         for _c in range(1, string_count):
 618             s = read_string()
 619             constant_strings.append(s)
 620         namespace_count = u30()
 621         for _c in range(1, namespace_count):
 622             read_bytes(1)  # kind
 623             u30()  # name
 624         ns_set_count = u30()
 625         for _c in range(1, ns_set_count):
 626             count = u30()
 627             for _c2 in range(count):
 628                 u30()
 629         multiname_count = u30()
 630         MULTINAME_SIZES = {
 631             0x07: 2,  # QName
 632             0x0d: 2,  # QNameA
 633             0x0f: 1,  # RTQName
 634             0x10: 1,  # RTQNameA
 635             0x11: 0,  # RTQNameL
 636             0x12: 0,  # RTQNameLA
 637             0x09: 2,  # Multiname
 638             0x0e: 2,  # MultinameA
 639             0x1b: 1,  # MultinameL
 640             0x1c: 1,  # MultinameLA
 641         }
 642         multinames = [u'']
 643         for _c in range(1, multiname_count):
 644             kind = u30()
 645             assert kind in MULTINAME_SIZES, u'Invalid multiname kind %r' % kind
 646             if kind == 0x07:
 647                 u30()  # namespace_idx
 648                 name_idx = u30()
 649                 multinames.append(constant_strings[name_idx])
 650             else:
 651                 multinames.append('[MULTINAME kind: %d]' % kind)
 652                 for _c2 in range(MULTINAME_SIZES[kind]):
 653                     u30()
 654
 655         # Methods
 656         method_count = u30()
 657         MethodInfo = collections.namedtuple(
 658             'MethodInfo',
 659             ['NEED_ARGUMENTS', 'NEED_REST'])
 660         method_infos = []
 661         for method_id in range(method_count):
 662             param_count = u30()
 663             u30()  # return type
 664             for _ in range(param_count):
 665                 u30()  # param type
 666             u30()  # name index (always 0 for youtube)
 667             flags = read_byte()
 668             if flags & 0x08 != 0:
 669                 # Options present
 670                 option_count = u30()
 671                 for c in range(option_count):
 672                     u30()  # val
 673                     read_bytes(1)  # kind
 674             if flags & 0x80 != 0:
 675                 # Param names present
 676                 for _ in range(param_count):
 677                     u30()  # param name
 678             mi = MethodInfo(flags & 0x01 != 0, flags & 0x04 != 0)
 679             method_infos.append(mi)
 680
 681         # Metadata
 682         metadata_count = u30()
 683         for _c in range(metadata_count):
 684             u30()  # name
 685             item_count = u30()
 686             for _c2 in range(item_count):
 687                 u30()  # key
 688                 u30()  # value
 689
 690         def parse_traits_info():
 691             trait_name_idx = u30()
 692             kind_full = read_byte()
 693             kind = kind_full & 0x0f
 694             attrs = kind_full >> 4
 695             methods = {}
 696             if kind in [0x00, 0x06]:  # Slot or Const
 697                 u30()  # Slot id
 698                 u30()  # type_name_idx
 699                 vindex = u30()
 700                 if vindex != 0:
 701                     read_byte()  # vkind
 702             elif kind in [0x01, 0x02, 0x03]:  # Method / Getter / Setter
 703                 u30()  # disp_id
 704                 method_idx = u30()
 705                 methods[multinames[trait_name_idx]] = method_idx
 706             elif kind == 0x04:  # Class
 707                 u30()  # slot_id
 708                 u30()  # classi
 709             elif kind == 0x05:  # Function
 710                 u30()  # slot_id
 711                 function_idx = u30()
 712                 methods[function_idx] = multinames[trait_name_idx]
 713             else:
 714                 raise ExtractorError(u'Unsupported trait kind %d' % kind)
 715
 716             if attrs & 0x4 != 0:  # Metadata present
 717                 metadata_count = u30()
 718                 for _c3 in range(metadata_count):
 719                     u30()  # metadata index
 720
 721             return methods
 722
 723         # Classes
 724         TARGET_CLASSNAME = u'SignatureDecipher'
 725         searched_idx = multinames.index(TARGET_CLASSNAME)
 726         searched_class_id = None
 727         class_count = u30()
 728         for class_id in range(class_count):
 729             name_idx = u30()
 730             if name_idx == searched_idx:
 731                 # We found the class we're looking for!
 732                 searched_class_id = class_id
 733             u30()  # super_name idx
 734             flags = read_byte()
 735             if flags & 0x08 != 0:  # Protected namespace is present
 736                 u30()  # protected_ns_idx
 737             intrf_count = u30()
 738             for _c2 in range(intrf_count):
 739                 u30()
 740             u30()  # iinit
 741             trait_count = u30()
 742             for _c2 in range(trait_count):
 743                 parse_traits_info()
 744
 745         if searched_class_id is None:
 746             raise ExtractorError(u'Target class %r not found' %
 747                                  TARGET_CLASSNAME)
 748
 749         method_names = {}
 750         method_idxs = {}
 751         for class_id in range(class_count):
 752             u30()  # cinit
 753             trait_count = u30()
 754             for _c2 in range(trait_count):
 755                 trait_methods = parse_traits_info()
 756                 if class_id == searched_class_id:
 757                     method_names.update(trait_methods.items())
 758                     method_idxs.update(dict(
 759                         (idx, name)
 760                         for name, idx in trait_methods.items()))
 761
 762         # Scripts
 763         script_count = u30()
 764         for _c in range(script_count):
 765             u30()  # init
 766             trait_count = u30()
 767             for _c2 in range(trait_count):
 768                 parse_traits_info()
 769
 770         # Method bodies
 771         method_body_count = u30()
 772         Method = collections.namedtuple('Method', ['code', 'local_count'])
 773         methods = {}
 774         for _c in range(method_body_count):
 775             method_idx = u30()
 776             u30()  # max_stack
 777             local_count = u30()
 778             u30()  # init_scope_depth
 779             u30()  # max_scope_depth
 780             code_length = u30()
 781             code = read_bytes(code_length)
 782             if method_idx in method_idxs:
 783                 m = Method(code, local_count)
 784                 methods[method_idxs[method_idx]] = m
 785             exception_count = u30()
 786             for _c2 in range(exception_count):
 787                 u30()  # from
 788                 u30()  # to
 789                 u30()  # target
 790                 u30()  # exc_type
 791                 u30()  # var_name
 792             trait_count = u30()
 793             for _c2 in range(trait_count):
 794                 parse_traits_info()
 795
 796         assert p + code_reader.tell() == len(code_tag)
 797         assert len(methods) == len(method_idxs)
 798
 799         method_pyfunctions = {}
 800
 801         def extract_function(func_name):
 802             if func_name in method_pyfunctions:
 803                 return method_pyfunctions[func_name]
 804             if func_name not in methods:
 805                 raise ExtractorError(u'Cannot find function %r' % func_name)
 806             m = methods[func_name]
 807
 808             def resfunc(args):
 809                 registers = ['(this)'] + list(args) + [None] * m.local_count
 810                 stack = []
 811                 coder = io.BytesIO(m.code)
 812                 while True:
 813                     opcode = struct.unpack('!B', coder.read(1))[0]
 814                     if opcode == 36:  # pushbyte
 815                         v = struct.unpack('!B', coder.read(1))[0]
 816                         stack.append(v)
 817                     elif opcode == 44:  # pushstring
 818                         idx = u30(coder)
 819                         stack.append(constant_strings[idx])
 820                     elif opcode == 48:  # pushscope
 821                         # We don't implement the scope register, so we'll just
 822                         # ignore the popped value
 823                         stack.pop()
 824                     elif opcode == 70:  # callproperty
 825                         index = u30(coder)
 826                         mname = multinames[index]
 827                         arg_count = u30(coder)
 828                         args = list(reversed(
 829                             [stack.pop() for _ in range(arg_count)]))
 830                         obj = stack.pop()
 831                         if mname == u'split':
 832                             assert len(args) == 1
 833                             assert isinstance(args[0], compat_str)
 834                             assert isinstance(obj, compat_str)
 835                             if args[0] == u'':
 836                                 res = list(obj)
 837                             else:
 838                                 res = obj.split(args[0])
 839                             stack.append(res)
 840                         elif mname == u'slice':
 841                             assert len(args) == 1
 842                             assert isinstance(args[0], int)
 843                             assert isinstance(obj, list)
 844                             res = obj[args[0]:]
 845                             stack.append(res)
 846                         elif mname == u'join':
 847                             assert len(args) == 1
 848                             assert isinstance(args[0], compat_str)
 849                             assert isinstance(obj, list)
 850                             res = args[0].join(obj)
 851                             stack.append(res)
 852                         elif mname in method_pyfunctions:
 853                             stack.append(method_pyfunctions[mname](args))
 854                         else:
 855                             raise NotImplementedError(
 856                                 u'Unsupported property %r on %r'
 857                                 % (mname, obj))
 858                     elif opcode == 72:  # returnvalue
 859                         res = stack.pop()
 860                         return res
 861                     elif opcode == 79:  # callpropvoid
 862                         index = u30(coder)
 863                         mname = multinames[index]
 864                         arg_count = u30(coder)
 865                         args = list(reversed(
 866                             [stack.pop() for _ in range(arg_count)]))
 867                         obj = stack.pop()
 868                         if mname == u'reverse':
 869                             assert isinstance(obj, list)
 870                             obj.reverse()
 871                         else:
 872                             raise NotImplementedError(
 873                                 u'Unsupported (void) property %r on %r'
 874                                 % (mname, obj))
 875                     elif opcode == 93:  # findpropstrict
 876                         index = u30(coder)
 877                         mname = multinames[index]
 878                         res = extract_function(mname)
 879                         stack.append(res)
 880                     elif opcode == 97:  # setproperty
 881                         index = u30(coder)
 882                         value = stack.pop()
 883                         idx = stack.pop()
 884                         obj = stack.pop()
 885                         assert isinstance(obj, list)
 886                         assert isinstance(idx, int)
 887                         obj[idx] = value
 888                     elif opcode == 98:  # getlocal
 889                         index = u30(coder)
 890                         stack.append(registers[index])
 891                     elif opcode == 99:  # setlocal
 892                         index = u30(coder)
 893                         value = stack.pop()
 894                         registers[index] = value
 895                     elif opcode == 102:  # getproperty
 896                         index = u30(coder)
 897                         pname = multinames[index]
 898                         if pname == u'length':
 899                             obj = stack.pop()
 900                             assert isinstance(obj, list)
 901                             stack.append(len(obj))
 902                         else:  # Assume attribute access
 903                             idx = stack.pop()
 904                             assert isinstance(idx, int)
 905                             obj = stack.pop()
 906                             assert isinstance(obj, list)
 907                             stack.append(obj[idx])
 908                     elif opcode == 128:  # coerce
 909                         u30(coder)
 910                     elif opcode == 133:  # coerce_s
 911                         assert isinstance(stack[-1], (type(None), compat_str))
 912                     elif opcode == 164:  # modulo
 913                         value2 = stack.pop()
 914                         value1 = stack.pop()
 915                         res = value1 % value2
 916                         stack.append(res)
 917                     elif opcode == 208:  # getlocal_0
 918                         stack.append(registers[0])
 919                     elif opcode == 209:  # getlocal_1
 920                         stack.append(registers[1])
 921                     elif opcode == 210:  # getlocal_2
 922                         stack.append(registers[2])
 923                     elif opcode == 211:  # getlocal_3
 924                         stack.append(registers[3])
 925                     elif opcode == 214:  # setlocal_2
 926                         registers[2] = stack.pop()
 927                     elif opcode == 215:  # setlocal_3
 928                         registers[3] = stack.pop()
 929                     else:
 930                         raise NotImplementedError(
 931                             u'Unsupported opcode %d' % opcode)
 932
 933             method_pyfunctions[func_name] = resfunc
 934             return resfunc
 935
 936         initial_function = extract_function(u'decipher')
 937         return lambda s: initial_function([s])
 938
 939     def _decrypt_signature(self, s, video_id, player_url, age_gate=False):
 940         """Turn the encrypted s field into a working signature"""
 941
 942         if player_url is not None:
 943             if player_url.startswith(u'//'):
 944                 player_url = u'https:' + player_url
 945             try:
 946                 player_id = (player_url, len(s))
 947                 if player_id not in self._player_cache:
 948                     func = self._extract_signature_function(
 949                         video_id, player_url, len(s)
 950                     )
 951                     self._player_cache[player_id] = func
 952                 func = self._player_cache[player_id]
 953                 if self._downloader.params.get('youtube_print_sig_code'):
 954                     self._print_sig_code(func, len(s))
 955                 return func(s)
 956             except Exception:
 957                 tb = traceback.format_exc()
 958                 self._downloader.report_warning(
 959                     u'Automatic signature extraction failed: ' + tb)
 960
 961             self._downloader.report_warning(
 962                 u'Warning: Falling back to static signature algorithm')
 963
 964         return self._static_decrypt_signature(
 965             s, video_id, player_url, age_gate)
 966
 967     def _static_decrypt_signature(self, s, video_id, player_url, age_gate):
 968         if age_gate:
 969             # The videos with age protection use another player, so the
 970             # algorithms can be different.
 971             if len(s) == 86:
 972                 return s[2:63] + s[82] + s[64:82] + s[63]
 973
 974         if len(s) == 93:
 975             return s[86:29:-1] + s[88] + s[28:5:-1]
 976         elif len(s) == 92:
 977             return s[25] + s[3:25] + s[0] + s[26:42] + s[79] + s[43:79] + s[91] + s[80:83]
 978         elif len(s) == 91:
 979             return s[84:27:-1] + s[86] + s[26:5:-1]
 980         elif len(s) == 90:
 981             return s[25] + s[3:25] + s[2] + s[26:40] + s[77] + s[41:77] + s[89] + s[78:81]
 982         elif len(s) == 89:
 983             return s[84:78:-1] + s[87] + s[77:60:-1] + s[0] + s[59:3:-1]
 984         elif len(s) == 88:
 985             return s[7:28] + s[87] + s[29:45] + s[55] + s[46:55] + s[2] + s[56:87] + s[28]
 986         elif len(s) == 87:
 987             return s[6:27] + s[4] + s[28:39] + s[27] + s[40:59] + s[2] + s[60:]
 988         elif len(s) == 86:
 989             return s[80:72:-1] + s[16] + s[71:39:-1] + s[72] + s[38:16:-1] + s[82] + s[15::-1]
 990         elif len(s) == 85:
 991             return s[3:11] + s[0] + s[12:55] + s[84] + s[56:84]
 992         elif len(s) == 84:
 993             return s[78:70:-1] + s[14] + s[69:37:-1] + s[70] + s[36:14:-1] + s[80] + s[:14][::-1]
 994         elif len(s) == 83:
 995             return s[80:63:-1] + s[0] + s[62:0:-1] + s[63]
 996         elif len(s) == 82:
 997             return s[80:37:-1] + s[7] + s[36:7:-1] + s[0] + s[6:0:-1] + s[37]
 998         elif len(s) == 81:
 999             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]
1000         elif len(s) == 80:
1001             return s[1:19] + s[0] + s[20:68] + s[19] + s[69:80]
1002         elif len(s) == 79:
1003             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]
1004
1005         else:
1006             raise ExtractorError(u'Unable to decrypt signature, key length %d not supported; retrying might work' % (len(s)))
1007
1008     def _get_available_subtitles(self, video_id, webpage):
1009         try:
1010             sub_list = self._download_webpage(
1011                 'http://video.google.com/timedtext?hl=en&type=list&v=%s' % video_id,
1012                 video_id, note=False)
1013         except ExtractorError as err:
1014             self._downloader.report_warning(u'unable to download video subtitles: %s' % compat_str(err))
1015             return {}
1016         lang_list = re.findall(r'name="([^"]*)"[^>]+lang_code="([\w\-]+)"', sub_list)
1017
1018         sub_lang_list = {}
1019         for l in lang_list:
1020             lang = l[1]
1021             params = compat_urllib_parse.urlencode({
1022                 'lang': lang,
1023                 'v': video_id,
1024                 'fmt': self._downloader.params.get('subtitlesformat', 'srt'),
1025                 'name': unescapeHTML(l[0]).encode('utf-8'),
1026             })
1027             url = u'http://www.youtube.com/api/timedtext?' + params
1028             sub_lang_list[lang] = url
1029         if not sub_lang_list:
1030             self._downloader.report_warning(u'video doesn\'t have subtitles')
1031             return {}
1032         return sub_lang_list
1033
1034     def _get_available_automatic_caption(self, video_id, webpage):
1035         """We need the webpage for getting the captions url, pass it as an
1036            argument to speed up the process."""
1037         sub_format = self._downloader.params.get('subtitlesformat', 'srt')
1038         self.to_screen(u'%s: Looking for automatic captions' % video_id)
1039         mobj = re.search(r';ytplayer.config = ({.*?});', webpage)
1040         err_msg = u'Couldn\'t find automatic captions for %s' % video_id
1041         if mobj is None:
1042             self._downloader.report_warning(err_msg)
1043             return {}
1044         player_config = json.loads(mobj.group(1))
1045         try:
1046             args = player_config[u'args']
1047             caption_url = args[u'ttsurl']
1048             timestamp = args[u'timestamp']
1049             # We get the available subtitles
1050             list_params = compat_urllib_parse.urlencode({
1051                 'type': 'list',
1052                 'tlangs': 1,
1053                 'asrs': 1,
1054             })
1055             list_url = caption_url + '&' + list_params
1056             caption_list = self._download_xml(list_url, video_id)
1057             original_lang_node = caption_list.find('track')
1058             if original_lang_node is None or original_lang_node.attrib.get('kind') != 'asr' :
1059                 self._downloader.report_warning(u'Video doesn\'t have automatic captions')
1060                 return {}
1061             original_lang = original_lang_node.attrib['lang_code']
1062
1063             sub_lang_list = {}
1064             for lang_node in caption_list.findall('target'):
1065                 sub_lang = lang_node.attrib['lang_code']
1066                 params = compat_urllib_parse.urlencode({
1067                     'lang': original_lang,
1068                     'tlang': sub_lang,
1069                     'fmt': sub_format,
1070                     'ts': timestamp,
1071                     'kind': 'asr',
1072                 })
1073                 sub_lang_list[sub_lang] = caption_url + '&' + params
1074             return sub_lang_list
1075         # An extractor error can be raise by the download process if there are
1076         # no automatic captions but there are subtitles
1077         except (KeyError, ExtractorError):
1078             self._downloader.report_warning(err_msg)
1079             return {}
1080
1081     def _extract_id(self, url):
1082         mobj = re.match(self._VALID_URL, url, re.VERBOSE)
1083         if mobj is None:
1084             raise ExtractorError(u'Invalid URL: %s' % url)
1085         video_id = mobj.group(2)
1086         return video_id
1087
1088     def _extract_from_m3u8(self, manifest_url, video_id):
1089         url_map = {}
1090         def _get_urls(_manifest):
1091             lines = _manifest.split('\n')
1092             urls = filter(lambda l: l and not l.startswith('#'),
1093                             lines)
1094             return urls
1095         manifest = self._download_webpage(manifest_url, video_id, u'Downloading formats manifest')
1096         formats_urls = _get_urls(manifest)
1097         for format_url in formats_urls:
1098             itag = self._search_regex(r'itag/(\d+?)/', format_url, 'itag')
1099             url_map[itag] = format_url
1100         return url_map
1101
1102     def _extract_annotations(self, video_id):
1103         url = 'https://www.youtube.com/annotations_invideo?features=1&legacy=1&video_id=%s' % video_id
1104         return self._download_webpage(url, video_id, note=u'Searching for annotations.', errnote=u'Unable to download video annotations.')
1105
1106     def _real_extract(self, url):
1107         # Extract original video URL from URL with redirection, like age verification, using next_url parameter
1108         mobj = re.search(self._NEXT_URL_RE, url)
1109         if mobj:
1110             url = 'https://www.youtube.com/' + compat_urllib_parse.unquote(mobj.group(1)).lstrip('/')
1111         video_id = self._extract_id(url)
1112
1113         # Get video webpage
1114         url = 'https://www.youtube.com/watch?v=%s&gl=US&hl=en&has_verified=1' % video_id
1115         video_webpage = self._download_webpage(url, video_id)
1116
1117         # Attempt to extract SWF player URL
1118         mobj = re.search(r'swfConfig.*?"(https?:\\/\\/.*?watch.*?-.*?\.swf)"', video_webpage)
1119         if mobj is not None:
1120             player_url = re.sub(r'\\(.)', r'\1', mobj.group(1))
1121         else:
1122             player_url = None
1123
1124         # Get video info
1125         self.report_video_info_webpage_download(video_id)
1126         if re.search(r'player-age-gate-content">', video_webpage) is not None:
1127             self.report_age_confirmation()
1128             age_gate = True
1129             # We simulate the access to the video from www.youtube.com/v/{video_id}
1130             # this can be viewed without login into Youtube
1131             data = compat_urllib_parse.urlencode({'video_id': video_id,
1132                                                   'el': 'player_embedded',
1133                                                   'gl': 'US',
1134                                                   'hl': 'en',
1135                                                   'eurl': 'https://youtube.googleapis.com/v/' + video_id,
1136                                                   'asv': 3,
1137                                                   'sts':'1588',
1138                                                   })
1139             video_info_url = 'https://www.youtube.com/get_video_info?' + data
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         else:
1145             age_gate = False
1146             for el_type in ['&el=embedded', '&el=detailpage', '&el=vevo', '']:
1147                 video_info_url = ('https://www.youtube.com/get_video_info?&video_id=%s%s&ps=default&eurl=&gl=US&hl=en'
1148                         % (video_id, el_type))
1149                 video_info_webpage = self._download_webpage(video_info_url, video_id,
1150                                         note=False,
1151                                         errnote='unable to download video info webpage')
1152                 video_info = compat_parse_qs(video_info_webpage)
1153                 if 'token' in video_info:
1154                     break
1155         if 'token' not in video_info:
1156             if 'reason' in video_info:
1157                 raise ExtractorError(u'YouTube said: %s' % video_info['reason'][0], expected=True)
1158             else:
1159                 raise ExtractorError(u'"token" parameter not in video info for unknown reason')
1160
1161         if 'view_count' in video_info:
1162             view_count = int(video_info['view_count'][0])
1163         else:
1164             view_count = None
1165
1166         # Check for "rental" videos
1167         if 'ypc_video_rental_bar_text' in video_info and 'author' not in video_info:
1168             raise ExtractorError(u'"rental" videos not supported')
1169
1170         # Start extracting information
1171         self.report_information_extraction(video_id)
1172
1173         # uploader
1174         if 'author' not in video_info:
1175             raise ExtractorError(u'Unable to extract uploader name')
1176         video_uploader = compat_urllib_parse.unquote_plus(video_info['author'][0])
1177
1178         # uploader_id
1179         video_uploader_id = None
1180         mobj = re.search(r'<link itemprop="url" href="http://www.youtube.com/(?:user|channel)/([^"]+)">', video_webpage)
1181         if mobj is not None:
1182             video_uploader_id = mobj.group(1)
1183         else:
1184             self._downloader.report_warning(u'unable to extract uploader nickname')
1185
1186         # title
1187         if 'title' in video_info:
1188             video_title = compat_urllib_parse.unquote_plus(video_info['title'][0])
1189         else:
1190             self._downloader.report_warning(u'Unable to extract video title')
1191             video_title = u'_'
1192
1193         # thumbnail image
1194         # We try first to get a high quality image:
1195         m_thumb = re.search(r'<span itemprop="thumbnail".*?href="(.*?)">',
1196                             video_webpage, re.DOTALL)
1197         if m_thumb is not None:
1198             video_thumbnail = m_thumb.group(1)
1199         elif 'thumbnail_url' not in video_info:
1200             self._downloader.report_warning(u'unable to extract video thumbnail')
1201             video_thumbnail = None
1202         else:   # don't panic if we can't find it
1203             video_thumbnail = compat_urllib_parse.unquote_plus(video_info['thumbnail_url'][0])
1204
1205         # upload date
1206         upload_date = None
1207         mobj = re.search(r'id="eow-date.*?>(.*?)</span>', video_webpage, re.DOTALL)
1208         if mobj is not None:
1209             upload_date = ' '.join(re.sub(r'[/,-]', r' ', mobj.group(1)).split())
1210             upload_date = unified_strdate(upload_date)
1211
1212         # description
1213         video_description = get_element_by_id("eow-description", video_webpage)
1214         if video_description:
1215             video_description = re.sub(r'''(?x)
1216                 <a\s+
1217                     (?:[a-zA-Z-]+="[^"]+"\s+)*?
1218                     title="([^"]+)"\s+
1219                     (?:[a-zA-Z-]+="[^"]+"\s+)*?
1220                     class="yt-uix-redirect-link"\s*>
1221                 [^<]+
1222                 </a>
1223             ''', r'\1', video_description)
1224             video_description = clean_html(video_description)
1225         else:
1226             fd_mobj = re.search(r'<meta name="description" content="([^"]+)"', video_webpage)
1227             if fd_mobj:
1228                 video_description = unescapeHTML(fd_mobj.group(1))
1229             else:
1230                 video_description = u''
1231
1232         def _extract_count(klass):
1233             count = self._search_regex(
1234                 r'class="%s">([\d,]+)</span>' % re.escape(klass),
1235                 video_webpage, klass, default=None)
1236             if count is not None:
1237                 return int(count.replace(',', ''))
1238             return None
1239         like_count = _extract_count(u'likes-count')
1240         dislike_count = _extract_count(u'dislikes-count')
1241
1242         # subtitles
1243         video_subtitles = self.extract_subtitles(video_id, video_webpage)
1244
1245         if self._downloader.params.get('listsubtitles', False):
1246             self._list_available_subtitles(video_id, video_webpage)
1247             return
1248
1249         if 'length_seconds' not in video_info:
1250             self._downloader.report_warning(u'unable to extract video duration')
1251             video_duration = None
1252         else:
1253             video_duration = int(compat_urllib_parse.unquote_plus(video_info['length_seconds'][0]))
1254
1255         # annotations
1256         video_annotations = None
1257         if self._downloader.params.get('writeannotations', False):
1258                 video_annotations = self._extract_annotations(video_id)
1259
1260         # Decide which formats to download
1261         try:
1262             mobj = re.search(r';ytplayer.config = ({.*?});', video_webpage)
1263             if not mobj:
1264                 raise ValueError('Could not find vevo ID')
1265             info = json.loads(mobj.group(1))
1266             args = info['args']
1267             # Easy way to know if the 's' value is in url_encoded_fmt_stream_map
1268             # this signatures are encrypted
1269             if 'url_encoded_fmt_stream_map' not in args:
1270                 raise ValueError(u'No stream_map present')  # caught below
1271             re_signature = re.compile(r'[&,]s=')
1272             m_s = re_signature.search(args['url_encoded_fmt_stream_map'])
1273             if m_s is not None:
1274                 self.to_screen(u'%s: Encrypted signatures detected.' % video_id)
1275                 video_info['url_encoded_fmt_stream_map'] = [args['url_encoded_fmt_stream_map']]
1276             m_s = re_signature.search(args.get('adaptive_fmts', u''))
1277             if m_s is not None:
1278                 if 'adaptive_fmts' in video_info:
1279                     video_info['adaptive_fmts'][0] += ',' + args['adaptive_fmts']
1280                 else:
1281                     video_info['adaptive_fmts'] = [args['adaptive_fmts']]
1282         except ValueError:
1283             pass
1284
1285         def _map_to_format_list(urlmap):
1286             formats = []
1287             for itag, video_real_url in urlmap.items():
1288                 dct = {
1289                     'format_id': itag,
1290                     'url': video_real_url,
1291                     'player_url': player_url,
1292                 }
1293                 if itag in self._formats:
1294                     dct.update(self._formats[itag])
1295                 formats.append(dct)
1296             return formats
1297
1298         if 'conn' in video_info and video_info['conn'][0].startswith('rtmp'):
1299             self.report_rtmp_download()
1300             formats = [{
1301                 'format_id': '_rtmp',
1302                 'protocol': 'rtmp',
1303                 'url': video_info['conn'][0],
1304                 'player_url': player_url,
1305             }]
1306         elif len(video_info.get('url_encoded_fmt_stream_map', [])) >= 1 or len(video_info.get('adaptive_fmts', [])) >= 1:
1307             encoded_url_map = video_info.get('url_encoded_fmt_stream_map', [''])[0] + ',' + video_info.get('adaptive_fmts',[''])[0]
1308             if 'rtmpe%3Dyes' in encoded_url_map:
1309                 raise ExtractorError('rtmpe downloads are not supported, see https://github.com/rg3/youtube-dl/issues/343 for more information.', expected=True)
1310             url_map = {}
1311             for url_data_str in encoded_url_map.split(','):
1312                 url_data = compat_parse_qs(url_data_str)
1313                 if 'itag' in url_data and 'url' in url_data:
1314                     url = url_data['url'][0]
1315                     if 'sig' in url_data:
1316                         url += '&signature=' + url_data['sig'][0]
1317                     elif 's' in url_data:
1318                         encrypted_sig = url_data['s'][0]
1319                         if self._downloader.params.get('verbose'):
1320                             if age_gate:
1321                                 if player_url is None:
1322                                     player_version = 'unknown'
1323                                 else:
1324                                     player_version = self._search_regex(
1325                                         r'-(.+)\.swf$', player_url,
1326                                         u'flash player', fatal=False)
1327                                 player_desc = 'flash player %s' % player_version
1328                             else:
1329                                 player_version = self._search_regex(
1330                                     r'html5player-(.+?)\.js', video_webpage,
1331                                     'html5 player', fatal=False)
1332                                 player_desc = u'html5 player %s' % player_version
1333
1334                             parts_sizes = u'.'.join(compat_str(len(part)) for part in encrypted_sig.split('.'))
1335                             self.to_screen(u'encrypted signature length %d (%s), itag %s, %s' %
1336                                 (len(encrypted_sig), parts_sizes, url_data['itag'][0], player_desc))
1337
1338                         if not age_gate:
1339                             jsplayer_url_json = self._search_regex(
1340                                 r'"assets":.+?"js":\s*("[^"]+")',
1341                                 video_webpage, u'JS player URL')
1342                             player_url = json.loads(jsplayer_url_json)
1343
1344                         signature = self._decrypt_signature(
1345                             encrypted_sig, video_id, player_url, age_gate)
1346                         url += '&signature=' + signature
1347                     if 'ratebypass' not in url:
1348                         url += '&ratebypass=yes'
1349                     url_map[url_data['itag'][0]] = url
1350             formats = _map_to_format_list(url_map)
1351         elif video_info.get('hlsvp'):
1352             manifest_url = video_info['hlsvp'][0]
1353             url_map = self._extract_from_m3u8(manifest_url, video_id)
1354             formats = _map_to_format_list(url_map)
1355         else:
1356             raise ExtractorError(u'no conn, hlsvp or url_encoded_fmt_stream_map information found in video info')
1357
1358         # Look for the DASH manifest
1359         dash_manifest_url_lst = video_info.get('dashmpd')
1360         if (dash_manifest_url_lst and dash_manifest_url_lst[0] and
1361                 self._downloader.params.get('youtube_include_dash_manifest', False)):
1362             try:
1363                 dash_doc = self._download_xml(
1364                     dash_manifest_url_lst[0], video_id,
1365                     note=u'Downloading DASH manifest',
1366                     errnote=u'Could not download DASH manifest')
1367                 for r in dash_doc.findall(u'.//{urn:mpeg:DASH:schema:MPD:2011}Representation'):
1368                     url_el = r.find('{urn:mpeg:DASH:schema:MPD:2011}BaseURL')
1369                     if url_el is None:
1370                         continue
1371                     format_id = r.attrib['id']
1372                     video_url = url_el.text
1373                     filesize = int_or_none(url_el.attrib.get('{http://youtube.com/yt/2012/10/10}contentLength'))
1374                     f = {
1375                         'format_id': format_id,
1376                         'url': video_url,
1377                         'width': int_or_none(r.attrib.get('width')),
1378                         'tbr': int_or_none(r.attrib.get('bandwidth'), 1000),
1379                         'asr': int_or_none(r.attrib.get('audioSamplingRate')),
1380                         'filesize': filesize,
1381                     }
1382                     try:
1383                         existing_format = next(
1384                             fo for fo in formats
1385                             if fo['format_id'] == format_id)
1386                     except StopIteration:
1387                         f.update(self._formats.get(format_id, {}))
1388                         formats.append(f)
1389                     else:
1390                         existing_format.update(f)
1391
1392             except (ExtractorError, KeyError) as e:
1393                 self.report_warning(u'Skipping DASH manifest: %s' % e, video_id)
1394
1395         self._sort_formats(formats)
1396
1397         return {
1398             'id':           video_id,
1399             'uploader':     video_uploader,
1400             'uploader_id':  video_uploader_id,
1401             'upload_date':  upload_date,
1402             'title':        video_title,
1403             'thumbnail':    video_thumbnail,
1404             'description':  video_description,
1405             'subtitles':    video_subtitles,
1406             'duration':     video_duration,
1407             'age_limit':    18 if age_gate else 0,
1408             'annotations':  video_annotations,
1409             'webpage_url': 'https://www.youtube.com/watch?v=%s' % video_id,
1410             'view_count':   view_count,
1411             'like_count': like_count,
1412             'dislike_count': dislike_count,
1413             'formats':      formats,
1414         }
1415
1416 class YoutubePlaylistIE(YoutubeBaseInfoExtractor):
1417     IE_DESC = u'YouTube.com playlists'
1418     _VALID_URL = r"""(?:
1419                         (?:https?://)?
1420                         (?:\w+\.)?
1421                         youtube\.com/
1422                         (?:
1423                            (?:course|view_play_list|my_playlists|artist|playlist|watch)
1424                            \? (?:.*?&)*? (?:p|a|list)=
1425                         |  p/
1426                         )
1427                         ((?:PL|EC|UU|FL|RD)?[0-9A-Za-z-_]{10,})
1428                         .*
1429                      |
1430                         ((?:PL|EC|UU|FL|RD)[0-9A-Za-z-_]{10,})
1431                      )"""
1432     _TEMPLATE_URL = 'https://www.youtube.com/playlist?list=%s&page=%s'
1433     _MORE_PAGES_INDICATOR = r'data-link-type="next"'
1434     _VIDEO_RE = r'href="/watch\?v=(?P<id>[0-9A-Za-z_-]{11})&amp;[^"]*?index=(?P<index>\d+)'
1435     IE_NAME = u'youtube:playlist'
1436
1437     @classmethod
1438     def suitable(cls, url):
1439         """Receives a URL and returns True if suitable for this IE."""
1440         return re.match(cls._VALID_URL, url, re.VERBOSE) is not None
1441
1442     def _real_initialize(self):
1443         self._login()
1444
1445     def _ids_to_results(self, ids):
1446         return [self.url_result(vid_id, 'Youtube', video_id=vid_id)
1447                        for vid_id in ids]
1448
1449     def _extract_mix(self, playlist_id):
1450         # The mixes are generated from a a single video
1451         # the id of the playlist is just 'RD' + video_id
1452         url = 'https://youtube.com/watch?v=%s&list=%s' % (playlist_id[-11:], playlist_id)
1453         webpage = self._download_webpage(url, playlist_id, u'Downloading Youtube mix')
1454         title_span = (get_element_by_attribute('class', 'title long-title', webpage) or
1455             get_element_by_attribute('class', 'title ', webpage))
1456         title = clean_html(title_span)
1457         video_re = r'data-index="\d+".*?href="/watch\?v=([0-9A-Za-z_-]{11})&amp;[^"]*?list=%s' % re.escape(playlist_id)
1458         ids = orderedSet(re.findall(video_re, webpage))
1459         url_results = self._ids_to_results(ids)
1460
1461         return self.playlist_result(url_results, playlist_id, title)
1462
1463     def _real_extract(self, url):
1464         # Extract playlist id
1465         mobj = re.match(self._VALID_URL, url, re.VERBOSE)
1466         if mobj is None:
1467             raise ExtractorError(u'Invalid URL: %s' % url)
1468         playlist_id = mobj.group(1) or mobj.group(2)
1469
1470         # Check if it's a video-specific URL
1471         query_dict = compat_urlparse.parse_qs(compat_urlparse.urlparse(url).query)
1472         if 'v' in query_dict:
1473             video_id = query_dict['v'][0]
1474             if self._downloader.params.get('noplaylist'):
1475                 self.to_screen(u'Downloading just video %s because of --no-playlist' % video_id)
1476                 return self.url_result(video_id, 'Youtube', video_id=video_id)
1477             else:
1478                 self.to_screen(u'Downloading playlist PL%s - add --no-playlist to just download video %s' % (playlist_id, video_id))
1479
1480         if playlist_id.startswith('RD'):
1481             # Mixes require a custom extraction process
1482             return self._extract_mix(playlist_id)
1483         if playlist_id.startswith('TL'):
1484             raise ExtractorError(u'For downloading YouTube.com top lists, use '
1485                 u'the "yttoplist" keyword, for example "youtube-dl \'yttoplist:music:Top Tracks\'"', expected=True)
1486
1487         # Extract the video ids from the playlist pages
1488         ids = []
1489
1490         for page_num in itertools.count(1):
1491             url = self._TEMPLATE_URL % (playlist_id, page_num)
1492             page = self._download_webpage(url, playlist_id, u'Downloading page #%s' % page_num)
1493             matches = re.finditer(self._VIDEO_RE, page)
1494             # We remove the duplicates and the link with index 0
1495             # (it's not the first video of the playlist)
1496             new_ids = orderedSet(m.group('id') for m in matches if m.group('index') != '0')
1497             ids.extend(new_ids)
1498
1499             if re.search(self._MORE_PAGES_INDICATOR, page) is None:
1500                 break
1501
1502         try:
1503             playlist_title = self._og_search_title(page)
1504         except RegexNotFoundError:
1505             self.report_warning(
1506                 u'Playlist page is missing OpenGraph title, falling back ...',
1507                 playlist_id)
1508             playlist_title = self._html_search_regex(
1509                 r'<h1 class="pl-header-title">(.*?)</h1>', page, u'title')
1510
1511         url_results = self._ids_to_results(ids)
1512         return self.playlist_result(url_results, playlist_id, playlist_title)
1513
1514
1515 class YoutubeTopListIE(YoutubePlaylistIE):
1516     IE_NAME = u'youtube:toplist'
1517     IE_DESC = (u'YouTube.com top lists, "yttoplist:{channel}:{list title}"'
1518         u' (Example: "yttoplist:music:Top Tracks")')
1519     _VALID_URL = r'yttoplist:(?P<chann>.*?):(?P<title>.*?)$'
1520
1521     def _real_extract(self, url):
1522         mobj = re.match(self._VALID_URL, url)
1523         channel = mobj.group('chann')
1524         title = mobj.group('title')
1525         query = compat_urllib_parse.urlencode({'title': title})
1526         playlist_re = 'href="([^"]+?%s[^"]+?)"' % re.escape(query)
1527         channel_page = self._download_webpage('https://www.youtube.com/%s' % channel, title)
1528         link = self._html_search_regex(playlist_re, channel_page, u'list')
1529         url = compat_urlparse.urljoin('https://www.youtube.com/', link)
1530
1531         video_re = r'data-index="\d+".*?data-video-id="([0-9A-Za-z_-]{11})"'
1532         ids = []
1533         # sometimes the webpage doesn't contain the videos
1534         # retry until we get them
1535         for i in itertools.count(0):
1536             msg = u'Downloading Youtube mix'
1537             if i > 0:
1538                 msg += ', retry #%d' % i
1539             webpage = self._download_webpage(url, title, msg)
1540             ids = orderedSet(re.findall(video_re, webpage))
1541             if ids:
1542                 break
1543         url_results = self._ids_to_results(ids)
1544         return self.playlist_result(url_results, playlist_title=title)
1545
1546
1547 class YoutubeChannelIE(InfoExtractor):
1548     IE_DESC = u'YouTube.com channels'
1549     _VALID_URL = r"^(?:https?://)?(?:youtu\.be|(?:\w+\.)?youtube(?:-nocookie)?\.com)/channel/([0-9A-Za-z_-]+)"
1550     _MORE_PAGES_INDICATOR = 'yt-uix-load-more'
1551     _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'
1552     IE_NAME = u'youtube:channel'
1553
1554     def extract_videos_from_page(self, page):
1555         ids_in_page = []
1556         for mobj in re.finditer(r'href="/watch\?v=([0-9A-Za-z_-]+)&?', page):
1557             if mobj.group(1) not in ids_in_page:
1558                 ids_in_page.append(mobj.group(1))
1559         return ids_in_page
1560
1561     def _real_extract(self, url):
1562         # Extract channel id
1563         mobj = re.match(self._VALID_URL, url)
1564         if mobj is None:
1565             raise ExtractorError(u'Invalid URL: %s' % url)
1566
1567         # Download channel page
1568         channel_id = mobj.group(1)
1569         video_ids = []
1570         url = 'https://www.youtube.com/channel/%s/videos' % channel_id
1571         channel_page = self._download_webpage(url, channel_id)
1572         autogenerated = re.search(r'''(?x)
1573                 class="[^"]*?(?:
1574                     channel-header-autogenerated-label|
1575                     yt-channel-title-autogenerated
1576                 )[^"]*"''', channel_page) is not None
1577
1578         if autogenerated:
1579             # The videos are contained in a single page
1580             # the ajax pages can't be used, they are empty
1581             video_ids = self.extract_videos_from_page(channel_page)
1582         else:
1583             # Download all channel pages using the json-based channel_ajax query
1584             for pagenum in itertools.count(1):
1585                 url = self._MORE_PAGES_URL % (pagenum, channel_id)
1586                 page = self._download_webpage(url, channel_id,
1587                                               u'Downloading page #%s' % pagenum)
1588
1589                 page = json.loads(page)
1590
1591                 ids_in_page = self.extract_videos_from_page(page['content_html'])
1592                 video_ids.extend(ids_in_page)
1593
1594                 if self._MORE_PAGES_INDICATOR not in page['load_more_widget_html']:
1595                     break
1596
1597         self._downloader.to_screen(u'[youtube] Channel %s: Found %i videos' % (channel_id, len(video_ids)))
1598
1599         url_entries = [self.url_result(video_id, 'Youtube', video_id=video_id)
1600                        for video_id in video_ids]
1601         return self.playlist_result(url_entries, channel_id)
1602
1603
1604 class YoutubeUserIE(InfoExtractor):
1605     IE_DESC = u'YouTube.com user videos (URL or "ytuser" keyword)'
1606     _VALID_URL = r'(?:(?:(?:https?://)?(?:\w+\.)?youtube\.com/(?:user/)?(?!(?:attribution_link|watch)(?:$|[^a-z_A-Z0-9-])))|ytuser:)(?!feed/)([A-Za-z0-9_-]+)'
1607     _TEMPLATE_URL = 'http://gdata.youtube.com/feeds/api/users/%s'
1608     _GDATA_PAGE_SIZE = 50
1609     _GDATA_URL = 'http://gdata.youtube.com/feeds/api/users/%s/uploads?max-results=%d&start-index=%d&alt=json'
1610     IE_NAME = u'youtube:user'
1611
1612     @classmethod
1613     def suitable(cls, url):
1614         # Don't return True if the url can be extracted with other youtube
1615         # extractor, the regex would is too permissive and it would match.
1616         other_ies = iter(klass for (name, klass) in globals().items() if name.endswith('IE') and klass is not cls)
1617         if any(ie.suitable(url) for ie in other_ies): return False
1618         else: return super(YoutubeUserIE, cls).suitable(url)
1619
1620     def _real_extract(self, url):
1621         # Extract username
1622         mobj = re.match(self._VALID_URL, url)
1623         if mobj is None:
1624             raise ExtractorError(u'Invalid URL: %s' % url)
1625
1626         username = mobj.group(1)
1627
1628         # Download video ids using YouTube Data API. Result size per
1629         # query is limited (currently to 50 videos) so we need to query
1630         # page by page until there are no video ids - it means we got
1631         # all of them.
1632
1633         def download_page(pagenum):
1634             start_index = pagenum * self._GDATA_PAGE_SIZE + 1
1635
1636             gdata_url = self._GDATA_URL % (username, self._GDATA_PAGE_SIZE, start_index)
1637             page = self._download_webpage(
1638                 gdata_url, username,
1639                 u'Downloading video ids from %d to %d' % (
1640                     start_index, start_index + self._GDATA_PAGE_SIZE))
1641
1642             try:
1643                 response = json.loads(page)
1644             except ValueError as err:
1645                 raise ExtractorError(u'Invalid JSON in API response: ' + compat_str(err))
1646             if 'entry' not in response['feed']:
1647                 return
1648
1649             # Extract video identifiers
1650             entries = response['feed']['entry']
1651             for entry in entries:
1652                 title = entry['title']['$t']
1653                 video_id = entry['id']['$t'].split('/')[-1]
1654                 yield {
1655                     '_type': 'url',
1656                     'url': video_id,
1657                     'ie_key': 'Youtube',
1658                     'id': 'video_id',
1659                     'title': title,
1660                 }
1661         url_results = PagedList(download_page, self._GDATA_PAGE_SIZE)
1662
1663         return self.playlist_result(url_results, playlist_title=username)
1664
1665
1666 class YoutubeSearchIE(SearchInfoExtractor):
1667     IE_DESC = u'YouTube.com searches'
1668     _API_URL = 'https://gdata.youtube.com/feeds/api/videos?q=%s&start-index=%i&max-results=50&v=2&alt=jsonc'
1669     _MAX_RESULTS = 1000
1670     IE_NAME = u'youtube:search'
1671     _SEARCH_KEY = 'ytsearch'
1672
1673     def _get_n_results(self, query, n):
1674         """Get a specified number of results for a query"""
1675
1676         video_ids = []
1677         pagenum = 0
1678         limit = n
1679
1680         while (50 * pagenum) < limit:
1681             result_url = self._API_URL % (compat_urllib_parse.quote_plus(query), (50*pagenum)+1)
1682             data_json = self._download_webpage(
1683                 result_url, video_id=u'query "%s"' % query,
1684                 note=u'Downloading page %s' % (pagenum + 1),
1685                 errnote=u'Unable to download API page')
1686             data = json.loads(data_json)
1687             api_response = data['data']
1688
1689             if 'items' not in api_response:
1690                 raise ExtractorError(u'[youtube] No video results')
1691
1692             new_ids = list(video['id'] for video in api_response['items'])
1693             video_ids += new_ids
1694
1695             limit = min(n, api_response['totalItems'])
1696             pagenum += 1
1697
1698         if len(video_ids) > n:
1699             video_ids = video_ids[:n]
1700         videos = [self.url_result(video_id, 'Youtube', video_id=video_id)
1701                   for video_id in video_ids]
1702         return self.playlist_result(videos, query)
1703
1704 class YoutubeSearchDateIE(YoutubeSearchIE):
1705     IE_NAME = YoutubeSearchIE.IE_NAME + ':date'
1706     _API_URL = 'https://gdata.youtube.com/feeds/api/videos?q=%s&start-index=%i&max-results=50&v=2&alt=jsonc&orderby=published'
1707     _SEARCH_KEY = 'ytsearchdate'
1708     IE_DESC = u'YouTube.com searches, newest videos first'
1709
1710 class YoutubeShowIE(InfoExtractor):
1711     IE_DESC = u'YouTube.com (multi-season) shows'
1712     _VALID_URL = r'https?://www\.youtube\.com/show/(.*)'
1713     IE_NAME = u'youtube:show'
1714
1715     def _real_extract(self, url):
1716         mobj = re.match(self._VALID_URL, url)
1717         show_name = mobj.group(1)
1718         webpage = self._download_webpage(url, show_name, u'Downloading show webpage')
1719         # There's one playlist for each season of the show
1720         m_seasons = list(re.finditer(r'href="(/playlist\?list=.*?)"', webpage))
1721         self.to_screen(u'%s: Found %s seasons' % (show_name, len(m_seasons)))
1722         return [self.url_result('https://www.youtube.com' + season.group(1), 'YoutubePlaylist') for season in m_seasons]
1723
1724
1725 class YoutubeFeedsInfoExtractor(YoutubeBaseInfoExtractor):
1726     """
1727     Base class for extractors that fetch info from
1728     http://www.youtube.com/feed_ajax
1729     Subclasses must define the _FEED_NAME and _PLAYLIST_TITLE properties.
1730     """
1731     _LOGIN_REQUIRED = True
1732     # use action_load_personal_feed instead of action_load_system_feed
1733     _PERSONAL_FEED = False
1734
1735     @property
1736     def _FEED_TEMPLATE(self):
1737         action = 'action_load_system_feed'
1738         if self._PERSONAL_FEED:
1739             action = 'action_load_personal_feed'
1740         return 'http://www.youtube.com/feed_ajax?%s=1&feed_name=%s&paging=%%s' % (action, self._FEED_NAME)
1741
1742     @property
1743     def IE_NAME(self):
1744         return u'youtube:%s' % self._FEED_NAME
1745
1746     def _real_initialize(self):
1747         self._login()
1748
1749     def _real_extract(self, url):
1750         feed_entries = []
1751         paging = 0
1752         for i in itertools.count(1):
1753             info = self._download_webpage(self._FEED_TEMPLATE % paging,
1754                                           u'%s feed' % self._FEED_NAME,
1755                                           u'Downloading page %s' % i)
1756             info = json.loads(info)
1757             feed_html = info['feed_html']
1758             m_ids = re.finditer(r'"/watch\?v=(.*?)["&]', feed_html)
1759             ids = orderedSet(m.group(1) for m in m_ids)
1760             feed_entries.extend(
1761                 self.url_result(video_id, 'Youtube', video_id=video_id)
1762                 for video_id in ids)
1763             if info['paging'] is None:
1764                 break
1765             paging = info['paging']
1766         return self.playlist_result(feed_entries, playlist_title=self._PLAYLIST_TITLE)
1767
1768 class YoutubeSubscriptionsIE(YoutubeFeedsInfoExtractor):
1769     IE_DESC = u'YouTube.com subscriptions feed, "ytsubs" keyword(requires authentication)'
1770     _VALID_URL = r'https?://www\.youtube\.com/feed/subscriptions|:ytsubs(?:criptions)?'
1771     _FEED_NAME = 'subscriptions'
1772     _PLAYLIST_TITLE = u'Youtube Subscriptions'
1773
1774 class YoutubeRecommendedIE(YoutubeFeedsInfoExtractor):
1775     IE_DESC = u'YouTube.com recommended videos, "ytrec" keyword (requires authentication)'
1776     _VALID_URL = r'https?://www\.youtube\.com/feed/recommended|:ytrec(?:ommended)?'
1777     _FEED_NAME = 'recommended'
1778     _PLAYLIST_TITLE = u'Youtube Recommended videos'
1779
1780 class YoutubeWatchLaterIE(YoutubeFeedsInfoExtractor):
1781     IE_DESC = u'Youtube watch later list, "ytwatchlater" keyword (requires authentication)'
1782     _VALID_URL = r'https?://www\.youtube\.com/feed/watch_later|:ytwatchlater'
1783     _FEED_NAME = 'watch_later'
1784     _PLAYLIST_TITLE = u'Youtube Watch Later'
1785     _PERSONAL_FEED = True
1786
1787 class YoutubeHistoryIE(YoutubeFeedsInfoExtractor):
1788     IE_DESC = u'Youtube watch history, "ythistory" keyword (requires authentication)'
1789     _VALID_URL = u'https?://www\.youtube\.com/feed/history|:ythistory'
1790     _FEED_NAME = 'history'
1791     _PERSONAL_FEED = True
1792     _PLAYLIST_TITLE = u'Youtube Watch History'
1793
1794 class YoutubeFavouritesIE(YoutubeBaseInfoExtractor):
1795     IE_NAME = u'youtube:favorites'
1796     IE_DESC = u'YouTube.com favourite videos, "ytfav" keyword (requires authentication)'
1797     _VALID_URL = r'https?://www\.youtube\.com/my_favorites|:ytfav(?:ou?rites)?'
1798     _LOGIN_REQUIRED = True
1799
1800     def _real_extract(self, url):
1801         webpage = self._download_webpage('https://www.youtube.com/my_favorites', 'Youtube Favourites videos')
1802         playlist_id = self._search_regex(r'list=(.+?)["&]', webpage, u'favourites playlist id')
1803         return self.url_result(playlist_id, 'YoutubePlaylist')
1804
1805
1806 class YoutubeTruncatedURLIE(InfoExtractor):
1807     IE_NAME = 'youtube:truncated_url'
1808     IE_DESC = False  # Do not list
1809     _VALID_URL = r'''(?x)
1810         (?:https?://)?[^/]+/watch\?feature=[a-z_]+$|
1811         (?:https?://)?(?:www\.)?youtube\.com/attribution_link\?a=[^&]+$
1812     '''
1813
1814     def _real_extract(self, url):
1815         raise ExtractorError(
1816             u'Did you forget to quote the URL? Remember that & is a meta '
1817             u'character in most shells, so you want to put the URL in quotes, '
1818             u'like  youtube-dl '
1819             u'"http://www.youtube.com/watch?feature=foo&v=BaW_jenozKc" '
1820             u' or simply  youtube-dl BaW_jenozKc  .',
1821             expected=True)