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Code Issues Releases Wiki Activity

[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 2013-08-08 08:54:10 +02:00
parent 372297e713
commit 8377574c9c
3 changed files with 73 additions and 144 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
youtube_dl/extractor/dailymotion.py
View File

@ -1,6 +1,5 @@
import re
import json
import itertools
import socket
from .common import InfoExtractor
@ -34,16 +33,12 @@ class DailyMotionSubtitlesIE(SubtitlesIE):
self._downloader.report_warning(u'video doesn\'t have subtitles')
return {}
def _get_subtitle_url(self, sub_lang, sub_name, video_id, format):
sub_lang_list = self._get_available_subtitles(video_id)
return sub_lang_list[sub_lang]
def _request_automatic_caption(self, video_id, webpage):
self._downloader.report_warning(u'Automatic Captions not supported by dailymotion')
self._downloader.report_warning(u'Automatic Captions not supported by this server')
return {}
class DailymotionIE(DailyMotionSubtitlesIE): #,InfoExtractor):
class DailymotionIE(DailyMotionSubtitlesIE):
"""Information Extractor for Dailymotion"""
_VALID_URL = r'(?i)(?:https?://)?(?:www\.)?dailymotion\.[a-z]{2,3}/video/([^/]+)'
@ -116,12 +111,6 @@ class DailymotionIE(DailyMotionSubtitlesIE): #,InfoExtractor):
self._list_available_subtitles(video_id)
return
if 'length_seconds' not in info:
self._downloader.report_warning(u'unable to extract video duration')
video_duration = ''
else:
video_duration = compat_urllib_parse.unquote_plus(video_info['length_seconds'][0])
return [{
'id': video_id,
'url': video_url,

27
youtube_dl/extractor/subtitles.py
View File

@ -15,7 +15,8 @@ class SubtitlesIE(InfoExtractor):
def report_video_subtitles_available(self, video_id, sub_lang_list):
"""Report available subtitles."""
sub_lang = ",".join(list(sub_lang_list.keys()))
self.to_screen(u'%s: Available subtitles for video: %s' % (video_id, sub_lang))
self.to_screen(u'%s: Available subtitles for video: %s' %
(video_id, sub_lang))
def _list_available_subtitles(self, video_id):
sub_lang_list = self._get_available_subtitles(video_id)
@ -27,9 +28,9 @@ class SubtitlesIE(InfoExtractor):
couldn't be found
"""
sub_lang_list = self._get_available_subtitles(video_id)
sub_format = self._downloader.params.get('subtitlesformat')
if not sub_lang_list: #There was some error, it didn't get the available subtitles
if not sub_lang_list: # error, it didn't get the available subtitles
return {}
if self._downloader.params.get('writesubtitles', False):
if self._downloader.params.get('subtitleslang', False):
sub_lang = self._downloader.params.get('subtitleslang')
@ -41,18 +42,15 @@ class SubtitlesIE(InfoExtractor):
self._downloader.report_warning(u'no closed captions found in the specified language "%s"' % sub_lang)
return {}
sub_lang_list = {sub_lang: sub_lang_list[sub_lang]}
subtitles = {}
for sub_lang in sub_lang_list:
subtitle = self._request_subtitle(sub_lang, sub_lang_list[sub_lang].encode('utf-8'), video_id, sub_format)
for sub_lang, url in sub_lang_list.iteritems():
subtitle = self._request_subtitle_url(sub_lang, url)
if subtitle:
subtitles[sub_lang] = subtitle
return subtitles
def _request_subtitle(self, sub_lang, sub_name, video_id, format):
""" Return the subtitle as a string or None if they are not found """
# return (u'Did not fetch video subtitles for %s' % sub_lang, None, None)
self.to_screen(u'%s: Downloading video subtitles for %s.%s' % (video_id, sub_lang, format))
url = self._get_subtitle_url(sub_lang, sub_name, video_id, format)
def _request_subtitle_url(self, sub_lang, url):
try:
sub = compat_urllib_request.urlopen(url).read().decode('utf-8')
except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
@ -64,13 +62,8 @@ class SubtitlesIE(InfoExtractor):
return sub
def _get_available_subtitles(self, video_id):
"""Get available subtitles. Redefine in subclasses."""
"""returns {(lang, url)} """
# return {}
pass
def _get_subtitle_url(self, sub_lang, sub_name, video_id, format):
"""returns the url for the given subtitle. Redefine in subclasses."""
"""returns the list of available subtitles like this {lang: url} """
"""or {} if not available. Must be redefined by the subclasses."""
pass
def _request_automatic_caption(self, video_id, webpage):

175
youtube_dl/extractor/youtube.py
View File

@ -7,6 +7,7 @@ import socket
import itertools
from .common import InfoExtractor, SearchInfoExtractor
from .subtitles import SubtitlesIE
from ..utils import (
compat_http_client,
compat_parse_qs,
@ -24,7 +25,66 @@ from ..utils import (
)
class YoutubeIE(InfoExtractor):
class YoutubeSubtitlesIE(SubtitlesIE):
def _get_available_subtitles(self, video_id):
request = compat_urllib_request.Request('http://video.google.com/timedtext?hl=en&type=list&v=%s' % video_id)
try:
sub_list = compat_urllib_request.urlopen(request).read().decode('utf-8')
except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
self._downloader.report_warning(u'unable to download video subtitles: %s' % compat_str(err))
return {}
lang_list = re.findall(r'name="([^"]*)"[^>]+lang_code="([\w\-]+)"', sub_list)
sub_lang_list = {}
for l in lang_list:
lang = l[1]
params = compat_urllib_parse.urlencode({
'lang': lang,
'v': video_id,
'fmt': self._downloader.params.get('subtitlesformat'),
})
url = u'http://www.youtube.com/api/timedtext?' + params
sub_lang_list[lang] = url
if not sub_lang_list:
self._downloader.report_warning(u'video doesn\'t have subtitles')
return {}
return sub_lang_list
def _request_automatic_caption(self, video_id, webpage):
"""We need the webpage for getting the captions url, pass it as an
argument to speed up the process."""
sub_lang = self._downloader.params.get('subtitleslang') or 'en'
sub_format = self._downloader.params.get('subtitlesformat')
self.to_screen(u'%s: Looking for automatic captions' % video_id)
mobj = re.search(r';ytplayer.config = ({.*?});', webpage)
err_msg = u'Couldn\'t find automatic captions for "%s"' % sub_lang
if mobj is None:
self._downloader.report_warning(err_msg)
return {}
player_config = json.loads(mobj.group(1))
try:
args = player_config[u'args']
caption_url = args[u'ttsurl']
timestamp = args[u'timestamp']
params = compat_urllib_parse.urlencode({
'lang': 'en',
'tlang': sub_lang,
'fmt': sub_format,
'ts': timestamp,
'kind': 'asr',
})
subtitles_url = caption_url + '&' + params
sub = self._download_webpage(subtitles_url, video_id, u'Downloading automatic captions')
return {sub_lang: sub}
# An extractor error can be raise by the download process if there are
# no automatic captions but there are subtitles
except (KeyError, ExtractorError):
self._downloader.report_warning(err_msg)
return {}
class YoutubeIE(YoutubeSubtitlesIE):
IE_DESC = u'YouTube.com'
_VALID_URL = r"""^
(
@ -151,19 +211,6 @@ class YoutubeIE(InfoExtractor):
"""Report attempt to download video info webpage."""
self.to_screen(u'%s: Downloading video info webpage' % video_id)
def report_video_subtitles_download(self, video_id):
"""Report attempt to download video info webpage."""
self.to_screen(u'%s: Checking available subtitles' % video_id)
def report_video_subtitles_request(self, video_id, sub_lang, format):
"""Report attempt to download video info webpage."""
self.to_screen(u'%s: Downloading video subtitles for %s.%s' % (video_id, sub_lang, format))
def report_video_subtitles_available(self, video_id, sub_lang_list):
"""Report available subtitles."""
sub_lang = ",".join(list(sub_lang_list.keys()))
self.to_screen(u'%s: Available subtitles for video: %s' % (video_id, sub_lang))
def report_information_extraction(self, video_id):
"""Report attempt to extract video information."""
self.to_screen(u'%s: Extracting video information' % video_id)
@ -203,106 +250,6 @@ class YoutubeIE(InfoExtractor):
else:
raise ExtractorError(u'Unable to decrypt signature, key length %d not supported; retrying might work' % (len(s)))
def _get_available_subtitles(self, video_id):
self.report_video_subtitles_download(video_id)
request = compat_urllib_request.Request('http://video.google.com/timedtext?hl=en&type=list&v=%s' % video_id)
try:
sub_list = compat_urllib_request.urlopen(request).read().decode('utf-8')
except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
self._downloader.report_warning(u'unable to download video subtitles: %s' % compat_str(err))
return {}
sub_lang_list = re.findall(r'name="([^"]*)"[^>]+lang_code="([\w\-]+)"', sub_list)
sub_lang_list = dict((l[1], l[0]) for l in sub_lang_list)
if not sub_lang_list:
self._downloader.report_warning(u'video doesn\'t have subtitles')
return {}
return sub_lang_list
def _list_available_subtitles(self, video_id):
sub_lang_list = self._get_available_subtitles(video_id)
self.report_video_subtitles_available(video_id, sub_lang_list)
def _request_subtitle(self, sub_lang, sub_name, video_id, format):
"""
Return the subtitle as a string or None if they are not found
"""
self.report_video_subtitles_request(video_id, sub_lang, format)
params = compat_urllib_parse.urlencode({
'lang': sub_lang,
'name': sub_name,
'v': video_id,
'fmt': format,
})
url = 'http://www.youtube.com/api/timedtext?' + params
try:
sub = compat_urllib_request.urlopen(url).read().decode('utf-8')
except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) 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 _request_automatic_caption(self, video_id, webpage):
"""We need the webpage for getting the captions url, pass it as an
argument to speed up the process."""
sub_lang = self._downloader.params.get('subtitleslang') or 'en'
sub_format = self._downloader.params.get('subtitlesformat')
self.to_screen(u'%s: Looking for automatic captions' % video_id)
mobj = re.search(r';ytplayer.config = ({.*?});', webpage)
err_msg = u'Couldn\'t find automatic captions for "%s"' % sub_lang
if mobj is None:
self._downloader.report_warning(err_msg)
return {}
player_config = json.loads(mobj.group(1))
try:
args = player_config[u'args']
caption_url = args[u'ttsurl']
timestamp = args[u'timestamp']
params = compat_urllib_parse.urlencode({
'lang': 'en',
'tlang': sub_lang,
'fmt': sub_format,
'ts': timestamp,
'kind': 'asr',
})
subtitles_url = caption_url + '&' + params
sub = self._download_webpage(subtitles_url, video_id, u'Downloading automatic captions')
return {sub_lang: sub}
# An extractor error can be raise by the download process if there are
# no automatic captions but there are subtitles
except (KeyError, ExtractorError):
self._downloader.report_warning(err_msg)
return {}
def _extract_subtitles(self, video_id):
"""
Return a dictionary: {language: subtitles} or {} if the subtitles
couldn't be found
"""
sub_lang_list = self._get_available_subtitles(video_id)
sub_format = self._downloader.params.get('subtitlesformat')
if not sub_lang_list: #There was some error, it didn't get the available subtitles
return {}
if self._downloader.params.get('writesubtitles', False):
if self._downloader.params.get('subtitleslang', False):
sub_lang = self._downloader.params.get('subtitleslang')
elif 'en' in sub_lang_list:
sub_lang = 'en'
else:
sub_lang = list(sub_lang_list.keys())[0]
if not sub_lang in sub_lang_list:
self._downloader.report_warning(u'no closed captions found in the specified language "%s"' % sub_lang)
return {}
sub_lang_list = {sub_lang: sub_lang_list[sub_lang]}
subtitles = {}
for sub_lang in sub_lang_list:
subtitle = self._request_subtitle(sub_lang, sub_lang_list[sub_lang].encode('utf-8'), video_id, sub_format)
if subtitle:
subtitles[sub_lang] = subtitle
return subtitles
def _print_formats(self, formats):
print('Available formats:')
for x in formats: