d82134c339
Subclasses just need to call the method extract_subtitles, which will call _extract_subtitles and _request_automatic_caption
Now the default implementation of _request_automatic_caption returns {}.
92 lines
3.7 KiB
Python
92 lines
3.7 KiB
Python
import socket
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from .common import InfoExtractor
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from ..utils import (
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compat_http_client,
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compat_urllib_error,
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compat_urllib_request,
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compat_str,
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)
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class SubtitlesInfoExtractor(InfoExtractor):
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def _list_available_subtitles(self, video_id):
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""" outputs the available subtitles for the video """
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sub_lang_list = self._get_available_subtitles(video_id)
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sub_lang = ",".join(list(sub_lang_list.keys()))
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self.to_screen(u'%s: Available subtitles for video: %s' %
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(video_id, sub_lang))
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def _extract_subtitles(self, video_id):
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""" returns {sub_lang: sub} or {} if subtitles not found """
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available_subs_list = self._get_available_subtitles(video_id)
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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('writesubtitles', False):
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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 not sub_lang in available_subs_list:
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self._downloader.report_warning(u'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 _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 = compat_urllib_request.urlopen(url).read().decode('utf-8')
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except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
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self._downloader.report_warning(u'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(u'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):
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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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pass
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def _request_automatic_caption(self, video_id, webpage):
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"""
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returns {sub_lang: sub} 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(u'Automatic Captions not supported by this server')
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return {}
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def extract_subtitles(self, video_id, video_webpage=None):
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"""
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Extract the subtitles and/or the automatic captions if requested.
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Returns None or a dictionary in the format {sub_lang: sub}
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"""
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video_subtitles = None
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if self._downloader.params.get('writesubtitles', False) or self._downloader.params.get('allsubtitles', False):
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video_subtitles = self._extract_subtitles(video_id)
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elif self._downloader.params.get('writeautomaticsub', False):
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video_subtitles = self._request_automatic_caption(video_id, video_webpage)
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return video_subtitles
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