mirror of
https://github.com/l1ving/youtube-dl
synced 2024-11-30 14:52:53 +08:00
100 lines
4.1 KiB
Python
100 lines
4.1 KiB
Python
from __future__ import unicode_literals
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from .common import InfoExtractor
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from ..compat import compat_str
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from ..utils import (
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ExtractorError,
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)
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class SubtitlesInfoExtractor(InfoExtractor):
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@property
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def _have_to_download_any_subtitles(self):
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return any([self._downloader.params.get('writesubtitles', False),
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self._downloader.params.get('writeautomaticsub')])
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def _list_available_subtitles(self, video_id, webpage):
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""" outputs the available subtitles for the video """
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sub_lang_list = self._get_available_subtitles(video_id, webpage)
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auto_captions_list = self._get_available_automatic_caption(video_id, webpage)
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sub_lang = ",".join(list(sub_lang_list.keys()))
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self.to_screen('%s: Available subtitles for video: %s' %
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(video_id, sub_lang))
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auto_lang = ",".join(auto_captions_list.keys())
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self.to_screen('%s: Available automatic captions for video: %s' %
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(video_id, auto_lang))
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def extract_subtitles(self, video_id, webpage):
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"""
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returns {sub_lang: sub} ,{} if subtitles not found or None if the
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subtitles aren't requested.
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"""
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if not self._have_to_download_any_subtitles:
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return None
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available_subs_list = {}
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if self._downloader.params.get('writeautomaticsub', False):
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available_subs_list.update(self._get_available_automatic_caption(video_id, webpage))
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if self._downloader.params.get('writesubtitles', False):
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available_subs_list.update(self._get_available_subtitles(video_id, webpage))
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if not available_subs_list: # error, it didn't get the available subtitles
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return {}
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if self._downloader.params.get('allsubtitles', False):
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sub_lang_list = available_subs_list
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else:
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if self._downloader.params.get('subtitleslangs', False):
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requested_langs = self._downloader.params.get('subtitleslangs')
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elif 'en' in available_subs_list:
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requested_langs = ['en']
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else:
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requested_langs = [list(available_subs_list.keys())[0]]
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sub_lang_list = {}
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for sub_lang in requested_langs:
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if sub_lang not in available_subs_list:
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self._downloader.report_warning('no closed captions found in the specified language "%s"' % sub_lang)
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continue
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sub_lang_list[sub_lang] = available_subs_list[sub_lang]
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subtitles = {}
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for sub_lang, url in sub_lang_list.items():
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subtitle = self._request_subtitle_url(sub_lang, url)
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if subtitle:
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subtitles[sub_lang] = subtitle
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return subtitles
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def _download_subtitle_url(self, sub_lang, url):
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return self._download_webpage(url, None, note=False)
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def _request_subtitle_url(self, sub_lang, url):
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""" makes the http request for the subtitle """
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try:
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sub = self._download_subtitle_url(sub_lang, url)
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except ExtractorError as err:
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self._downloader.report_warning('unable to download video subtitles for %s: %s' % (sub_lang, compat_str(err)))
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return
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if not sub:
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self._downloader.report_warning('Did not fetch video subtitles')
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return
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return sub
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def _get_available_subtitles(self, video_id, webpage):
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"""
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returns {sub_lang: url} or {} if not available
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Must be redefined by the subclasses
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"""
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# By default, allow implementations to simply pass in the result
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assert isinstance(webpage, dict), \
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'_get_available_subtitles not implemented'
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return webpage
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def _get_available_automatic_caption(self, video_id, webpage):
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"""
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returns {sub_lang: url} or {} if not available
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Must be redefined by the subclasses that support automatic captions,
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otherwise it will return {}
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"""
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self._downloader.report_warning('Automatic Captions not supported by this server')
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return {}
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