mirror of
https://github.com/l1ving/youtube-dl
synced 2024-12-21 21:52:52 +08:00
[internal] Improved subtitle architecture + (update in
youtube/dailymotion) The structure of subtitles was refined, you only need to implement one method that returns a dictionnary of the available subtitles (lang, url) to support all the subtitle options in a website. I updated the subtitle downloaders for youtube/dailymotion to show how it works.
This commit is contained in:
Ismael Mejia
parent
372297e713
commit
8377574c9c
@ -1,6 +1,5 @@
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import re
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import json
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import itertools
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import socket
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from .common import InfoExtractor
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@ -34,16 +33,12 @@ class DailyMotionSubtitlesIE(SubtitlesIE):
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self._downloader.report_warning(u'video doesn\'t have subtitles')
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return {}
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def _get_subtitle_url(self, sub_lang, sub_name, video_id, format):
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sub_lang_list = self._get_available_subtitles(video_id)
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return sub_lang_list[sub_lang]
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def _request_automatic_caption(self, video_id, webpage):
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self._downloader.report_warning(u'Automatic Captions not supported by dailymotion')
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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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class DailymotionIE(DailyMotionSubtitlesIE): #,InfoExtractor):
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class DailymotionIE(DailyMotionSubtitlesIE):
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"""Information Extractor for Dailymotion"""
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_VALID_URL = r'(?i)(?:https?://)?(?:www\.)?dailymotion\.[a-z]{2,3}/video/([^/]+)'
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@ -116,12 +111,6 @@ class DailymotionIE(DailyMotionSubtitlesIE): #,InfoExtractor):
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self._list_available_subtitles(video_id)
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return
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if 'length_seconds' not in info:
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self._downloader.report_warning(u'unable to extract video duration')
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video_duration = ''
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else:
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video_duration = compat_urllib_parse.unquote_plus(video_info['length_seconds'][0])
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return [{
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'id': video_id,
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'url': video_url,
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@ -15,7 +15,8 @@ class SubtitlesIE(InfoExtractor):
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def report_video_subtitles_available(self, video_id, sub_lang_list):
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"""Report available subtitles."""
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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' % (video_id, sub_lang))
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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 _list_available_subtitles(self, video_id):
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sub_lang_list = self._get_available_subtitles(video_id)
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@ -27,9 +28,9 @@ class SubtitlesIE(InfoExtractor):
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couldn't be found
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"""
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sub_lang_list = self._get_available_subtitles(video_id)
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sub_format = self._downloader.params.get('subtitlesformat')
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if not sub_lang_list: #There was some error, it didn't get the available subtitles
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if not sub_lang_list: # error, it didn't get the available subtitles
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return {}
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if self._downloader.params.get('writesubtitles', False):
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if self._downloader.params.get('subtitleslang', False):
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sub_lang = self._downloader.params.get('subtitleslang')
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@ -41,18 +42,15 @@ class SubtitlesIE(InfoExtractor):
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self._downloader.report_warning(u'no closed captions found in the specified language "%s"' % sub_lang)
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return {}
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sub_lang_list = {sub_lang: sub_lang_list[sub_lang]}
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subtitles = {}
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for sub_lang in sub_lang_list:
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subtitle = self._request_subtitle(sub_lang, sub_lang_list[sub_lang].encode('utf-8'), video_id, sub_format)
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for sub_lang, url in sub_lang_list.iteritems():
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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(self, sub_lang, sub_name, video_id, format):
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""" Return the subtitle as a string or None if they are not found """
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# return (u'Did not fetch video subtitles for %s' % sub_lang, None, None)
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self.to_screen(u'%s: Downloading video subtitles for %s.%s' % (video_id, sub_lang, format))
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url = self._get_subtitle_url(sub_lang, sub_name, video_id, format)
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def _request_subtitle_url(self, sub_lang, url):
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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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@ -64,13 +62,8 @@ class SubtitlesIE(InfoExtractor):
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return sub
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def _get_available_subtitles(self, video_id):
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"""Get available subtitles. Redefine in subclasses."""
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"""returns {(lang, url)} """
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# return {}
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pass
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def _get_subtitle_url(self, sub_lang, sub_name, video_id, format):
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"""returns the url for the given subtitle. Redefine in subclasses."""
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"""returns the list of available subtitles like this {lang: url} """
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"""or {} if not available. Must be redefined by the subclasses."""
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pass
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def _request_automatic_caption(self, video_id, webpage):
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@ -7,6 +7,7 @@ import socket
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import itertools
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from .common import InfoExtractor, SearchInfoExtractor
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from .subtitles import SubtitlesIE
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from ..utils import (
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compat_http_client,
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compat_parse_qs,
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@ -24,7 +25,66 @@ from ..utils import (
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)
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class YoutubeIE(InfoExtractor):
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class YoutubeSubtitlesIE(SubtitlesIE):
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def _get_available_subtitles(self, video_id):
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request = compat_urllib_request.Request('http://video.google.com/timedtext?hl=en&type=list&v=%s' % video_id)
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try:
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sub_list = compat_urllib_request.urlopen(request).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: %s' % compat_str(err))
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return {}
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lang_list = re.findall(r'name="([^"]*)"[^>]+lang_code="([\w\-]+)"', sub_list)
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sub_lang_list = {}
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for l in lang_list:
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lang = l[1]
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params = compat_urllib_parse.urlencode({
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'lang': lang,
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'v': video_id,
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'fmt': self._downloader.params.get('subtitlesformat'),
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})
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url = u'http://www.youtube.com/api/timedtext?' + params
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sub_lang_list[lang] = url
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if not sub_lang_list:
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self._downloader.report_warning(u'video doesn\'t have subtitles')
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return {}
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return sub_lang_list
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def _request_automatic_caption(self, video_id, webpage):
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"""We need the webpage for getting the captions url, pass it as an
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argument to speed up the process."""
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sub_lang = self._downloader.params.get('subtitleslang') or 'en'
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sub_format = self._downloader.params.get('subtitlesformat')
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self.to_screen(u'%s: Looking for automatic captions' % video_id)
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mobj = re.search(r';ytplayer.config = ({.*?});', webpage)
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err_msg = u'Couldn\'t find automatic captions for "%s"' % sub_lang
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if mobj is None:
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self._downloader.report_warning(err_msg)
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return {}
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player_config = json.loads(mobj.group(1))
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try:
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args = player_config[u'args']
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caption_url = args[u'ttsurl']
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timestamp = args[u'timestamp']
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params = compat_urllib_parse.urlencode({
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'lang': 'en',
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'tlang': sub_lang,
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'fmt': sub_format,
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'ts': timestamp,
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'kind': 'asr',
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})
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subtitles_url = caption_url + '&' + params
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sub = self._download_webpage(subtitles_url, video_id, u'Downloading automatic captions')
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return {sub_lang: sub}
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# An extractor error can be raise by the download process if there are
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# no automatic captions but there are subtitles
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except (KeyError, ExtractorError):
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self._downloader.report_warning(err_msg)
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return {}
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class YoutubeIE(YoutubeSubtitlesIE):
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IE_DESC = u'YouTube.com'
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_VALID_URL = r"""^
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(
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@ -151,19 +211,6 @@ class YoutubeIE(InfoExtractor):
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"""Report attempt to download video info webpage."""
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self.to_screen(u'%s: Downloading video info webpage' % video_id)
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def report_video_subtitles_download(self, video_id):
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"""Report attempt to download video info webpage."""
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self.to_screen(u'%s: Checking available subtitles' % video_id)
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def report_video_subtitles_request(self, video_id, sub_lang, format):
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"""Report attempt to download video info webpage."""
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self.to_screen(u'%s: Downloading video subtitles for %s.%s' % (video_id, sub_lang, format))
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def report_video_subtitles_available(self, video_id, sub_lang_list):
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"""Report available subtitles."""
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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' % (video_id, sub_lang))
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def report_information_extraction(self, video_id):
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"""Report attempt to extract video information."""
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self.to_screen(u'%s: Extracting video information' % video_id)
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@ -203,106 +250,6 @@ class YoutubeIE(InfoExtractor):
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else:
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raise ExtractorError(u'Unable to decrypt signature, key length %d not supported; retrying might work' % (len(s)))
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def _get_available_subtitles(self, video_id):
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self.report_video_subtitles_download(video_id)
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request = compat_urllib_request.Request('http://video.google.com/timedtext?hl=en&type=list&v=%s' % video_id)
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try:
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sub_list = compat_urllib_request.urlopen(request).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: %s' % compat_str(err))
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return {}
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sub_lang_list = re.findall(r'name="([^"]*)"[^>]+lang_code="([\w\-]+)"', sub_list)
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sub_lang_list = dict((l[1], l[0]) for l in sub_lang_list)
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if not sub_lang_list:
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self._downloader.report_warning(u'video doesn\'t have subtitles')
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return {}
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return sub_lang_list
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def _list_available_subtitles(self, video_id):
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sub_lang_list = self._get_available_subtitles(video_id)
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self.report_video_subtitles_available(video_id, sub_lang_list)
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def _request_subtitle(self, sub_lang, sub_name, video_id, format):
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"""
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Return the subtitle as a string or None if they are not found
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"""
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self.report_video_subtitles_request(video_id, sub_lang, format)
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params = compat_urllib_parse.urlencode({
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'lang': sub_lang,
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'name': sub_name,
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'v': video_id,
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'fmt': format,
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})
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url = 'http://www.youtube.com/api/timedtext?' + params
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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 _request_automatic_caption(self, video_id, webpage):
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"""We need the webpage for getting the captions url, pass it as an
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argument to speed up the process."""
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sub_lang = self._downloader.params.get('subtitleslang') or 'en'
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sub_format = self._downloader.params.get('subtitlesformat')
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self.to_screen(u'%s: Looking for automatic captions' % video_id)
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mobj = re.search(r';ytplayer.config = ({.*?});', webpage)
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err_msg = u'Couldn\'t find automatic captions for "%s"' % sub_lang
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if mobj is None:
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self._downloader.report_warning(err_msg)
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return {}
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player_config = json.loads(mobj.group(1))
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try:
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args = player_config[u'args']
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caption_url = args[u'ttsurl']
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timestamp = args[u'timestamp']
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params = compat_urllib_parse.urlencode({
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'lang': 'en',
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'tlang': sub_lang,
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'fmt': sub_format,
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'ts': timestamp,
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'kind': 'asr',
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})
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subtitles_url = caption_url + '&' + params
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sub = self._download_webpage(subtitles_url, video_id, u'Downloading automatic captions')
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return {sub_lang: sub}
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# An extractor error can be raise by the download process if there are
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# no automatic captions but there are subtitles
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except (KeyError, ExtractorError):
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self._downloader.report_warning(err_msg)
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return {}
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def _extract_subtitles(self, video_id):
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"""
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Return a dictionary: {language: subtitles} or {} if the subtitles
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couldn't be found
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"""
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sub_lang_list = self._get_available_subtitles(video_id)
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sub_format = self._downloader.params.get('subtitlesformat')
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if not sub_lang_list: #There was some error, it didn't get the available subtitles
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return {}
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if self._downloader.params.get('writesubtitles', False):
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if self._downloader.params.get('subtitleslang', False):
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sub_lang = self._downloader.params.get('subtitleslang')
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elif 'en' in sub_lang_list:
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sub_lang = 'en'
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else:
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sub_lang = list(sub_lang_list.keys())[0]
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if not sub_lang in sub_lang_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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return {}
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sub_lang_list = {sub_lang: sub_lang_list[sub_lang]}
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subtitles = {}
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for sub_lang in sub_lang_list:
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subtitle = self._request_subtitle(sub_lang, sub_lang_list[sub_lang].encode('utf-8'), video_id, sub_format)
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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 _print_formats(self, formats):
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print('Available formats:')
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for x in formats:
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