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from .common import InfoExtractor
from ..utils import (
compat_str,
ExtractorError,
)
class SubtitlesInfoExtractor(InfoExtractor):
def _list_available_subtitles(self, video_id):
""" outputs the available subtitles for the video """
sub_lang_list = self._get_available_subtitles(video_id)
sub_lang = ",".join(list(sub_lang_list.keys()))
self.to_screen(u'%s: Available subtitles for video: %s' %
(video_id, sub_lang))
def extract_subtitles(self, video_id, video_webpage=None):
""" returns {sub_lang: sub} or {} if subtitles not found """
if self._downloader.params.get('writesubtitles', False) or self._downloader.params.get('allsubtitles', False):
available_subs_list = self._get_available_subtitles(video_id)
elif self._downloader.params.get('writeautomaticsub', False):
available_subs_list = self._get_available_automatic_caption(video_id, video_webpage)
else:
return None
if not available_subs_list: # error, it didn't get the available subtitles
return {}
if self._downloader.params.get('allsubtitles', False):
sub_lang_list = available_subs_list
else:
if self._downloader.params.get('subtitleslangs', False):
requested_langs = self._downloader.params.get('subtitleslangs')
elif 'en' in available_subs_list:
requested_langs = ['en']
else:
requested_langs = [list(available_subs_list.keys())[0]]
sub_lang_list = {}
for sub_lang in requested_langs:
if not sub_lang in available_subs_list:
self._downloader.report_warning(u'no closed captions found in the specified language "%s"' % sub_lang)
continue
sub_lang_list[sub_lang] = available_subs_list[sub_lang]
subtitles = {}
for sub_lang, url in sub_lang_list.items():
subtitle = self._request_subtitle_url(sub_lang, url)
if subtitle:
subtitles[sub_lang] = subtitle
return subtitles
def _request_subtitle_url(self, sub_lang, url):
""" makes the http request for the subtitle """
try:
sub = self._download_webpage(url, None, note=False)
except ExtractorError as err:
self._downloader.report_warning(u'unable to download video subtitles for %s: %s' % (sub_lang, compat_str(err)))
return
if not sub:
self._downloader.report_warning(u'Did not fetch video subtitles')
return
return sub
def _get_available_subtitles(self, video_id):
"""
returns {sub_lang: url} or {} if not available
Must be redefined by the subclasses
"""
pass
def _get_available_automatic_caption(self, video_id, webpage):
"""
returns {sub_lang: url} or {} if not available
Must be redefined by the subclasses that support automatic captions,
otherwise it will return {}
"""
self._downloader.report_warning(u'Automatic Captions not supported by this server')
return {}
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