680 lines
24 KiB
Python
680 lines
24 KiB
Python
"""
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Utility functions for transcripts.
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++++++++++++++++++++++++++++++++++
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"""
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import os
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import copy
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import json
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import requests
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import logging
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from pysrt import SubRipTime, SubRipItem, SubRipFile
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from lxml import etree
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from HTMLParser import HTMLParser
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from xmodule.exceptions import NotFoundError
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from xmodule.contentstore.content import StaticContent
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from xmodule.contentstore.django import contentstore
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from .bumper_utils import get_bumper_settings
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log = logging.getLogger(__name__)
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class TranscriptException(Exception): # pylint: disable=missing-docstring
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pass
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class TranscriptsGenerationException(Exception): # pylint: disable=missing-docstring
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pass
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class GetTranscriptsFromYouTubeException(Exception): # pylint: disable=missing-docstring
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pass
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class TranscriptsRequestValidationException(Exception): # pylint: disable=missing-docstring
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pass
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def generate_subs(speed, source_speed, source_subs):
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"""
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Generate transcripts from one speed to another speed.
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Args:
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`speed`: float, for this speed subtitles will be generated,
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`source_speed`: float, speed of source_subs
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`source_subs`: dict, existing subtitles for speed `source_speed`.
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Returns:
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`subs`: dict, actual subtitles.
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"""
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if speed == source_speed:
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return source_subs
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coefficient = 1.0 * speed / source_speed
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subs = {
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'start': [
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int(round(timestamp * coefficient)) for
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timestamp in source_subs['start']
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],
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'end': [
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int(round(timestamp * coefficient)) for
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timestamp in source_subs['end']
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],
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'text': source_subs['text']}
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return subs
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def save_to_store(content, name, mime_type, location):
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"""
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Save named content to store by location.
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Returns location of saved content.
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"""
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content_location = Transcript.asset_location(location, name)
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content = StaticContent(content_location, name, mime_type, content)
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contentstore().save(content)
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return content_location
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def save_subs_to_store(subs, subs_id, item, language='en'):
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"""
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Save transcripts into `StaticContent`.
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Args:
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`subs_id`: str, subtitles id
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`item`: video module instance
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`language`: two chars str ('uk'), language of translation of transcripts
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Returns: location of saved subtitles.
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"""
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filedata = json.dumps(subs, indent=2)
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filename = subs_filename(subs_id, language)
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return save_to_store(filedata, filename, 'application/json', item.location)
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def youtube_video_transcript_name(youtube_text_api):
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"""
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Get the transcript name from available transcripts of video
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with respect to language from youtube server
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"""
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utf8_parser = etree.XMLParser(encoding='utf-8')
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transcripts_param = {'type': 'list', 'v': youtube_text_api['params']['v']}
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lang = youtube_text_api['params']['lang']
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# get list of transcripts of specific video
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# url-form
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# http://video.google.com/timedtext?type=list&v={VideoId}
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youtube_response = requests.get('http://' + youtube_text_api['url'], params=transcripts_param)
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if youtube_response.status_code == 200 and youtube_response.text:
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youtube_data = etree.fromstring(youtube_response.content, parser=utf8_parser)
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# iterate all transcripts information from youtube server
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for element in youtube_data:
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# search specific language code such as 'en' in transcripts info list
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if element.tag == 'track' and element.get('lang_code', '') == lang:
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return element.get('name')
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return None
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def get_transcripts_from_youtube(youtube_id, settings, i18n, youtube_transcript_name=''):
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"""
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Gets transcripts from youtube for youtube_id.
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Parses only utf-8 encoded transcripts.
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Other encodings are not supported at the moment.
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Returns (status, transcripts): bool, dict.
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"""
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_ = i18n.ugettext
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utf8_parser = etree.XMLParser(encoding='utf-8')
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youtube_text_api = copy.deepcopy(settings.YOUTUBE['TEXT_API'])
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youtube_text_api['params']['v'] = youtube_id
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# if the transcript name is not empty on youtube server we have to pass
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# name param in url in order to get transcript
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# example http://video.google.com/timedtext?lang=en&v={VideoId}&name={transcript_name}
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youtube_transcript_name = youtube_video_transcript_name(youtube_text_api)
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if youtube_transcript_name:
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youtube_text_api['params']['name'] = youtube_transcript_name
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data = requests.get('http://' + youtube_text_api['url'], params=youtube_text_api['params'])
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if data.status_code != 200 or not data.text:
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msg = _("Can't receive transcripts from Youtube for {youtube_id}. Status code: {status_code}.").format(
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youtube_id=youtube_id,
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status_code=data.status_code
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)
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raise GetTranscriptsFromYouTubeException(msg)
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sub_starts, sub_ends, sub_texts = [], [], []
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xmltree = etree.fromstring(data.content, parser=utf8_parser)
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for element in xmltree:
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if element.tag == "text":
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start = float(element.get("start"))
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duration = float(element.get("dur", 0)) # dur is not mandatory
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text = element.text
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end = start + duration
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if text:
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# Start and end should be ints representing the millisecond timestamp.
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sub_starts.append(int(start * 1000))
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sub_ends.append(int((end + 0.0001) * 1000))
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sub_texts.append(text.replace('\n', ' '))
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return {'start': sub_starts, 'end': sub_ends, 'text': sub_texts}
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def download_youtube_subs(youtube_id, video_descriptor, settings):
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"""
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Download transcripts from Youtube and save them to assets.
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Args:
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youtube_id: str, actual youtube_id of the video.
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video_descriptor: video descriptor instance.
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We save transcripts for 1.0 speed, as for other speed conversion is done on front-end.
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Returns:
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None, if transcripts were successfully downloaded and saved.
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Raises:
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GetTranscriptsFromYouTubeException, if fails.
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"""
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i18n = video_descriptor.runtime.service(video_descriptor, "i18n")
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_ = i18n.ugettext
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subs = get_transcripts_from_youtube(youtube_id, settings, i18n)
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save_subs_to_store(subs, youtube_id, video_descriptor)
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log.info("Transcripts for youtube_id %s for 1.0 speed are downloaded and saved.", youtube_id)
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def remove_subs_from_store(subs_id, item, lang='en'):
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"""
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Remove from store, if transcripts content exists.
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"""
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filename = subs_filename(subs_id, lang)
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Transcript.delete_asset(item.location, filename)
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def generate_subs_from_source(speed_subs, subs_type, subs_filedata, item, language='en'):
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"""Generate transcripts from source files (like SubRip format, etc.)
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and save them to assets for `item` module.
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We expect, that speed of source subs equal to 1
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:param speed_subs: dictionary {speed: sub_id, ...}
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:param subs_type: type of source subs: "srt", ...
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:param subs_filedata:unicode, content of source subs.
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:param item: module object.
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:param language: str, language of translation of transcripts
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:returns: True, if all subs are generated and saved successfully.
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"""
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_ = item.runtime.service(item, "i18n").ugettext
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if subs_type.lower() != 'srt':
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raise TranscriptsGenerationException(_("We support only SubRip (*.srt) transcripts format."))
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try:
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srt_subs_obj = SubRipFile.from_string(subs_filedata)
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except Exception as ex:
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msg = _("Something wrong with SubRip transcripts file during parsing. Inner message is {error_message}").format(
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error_message=ex.message
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)
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raise TranscriptsGenerationException(msg)
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if not srt_subs_obj:
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raise TranscriptsGenerationException(_("Something wrong with SubRip transcripts file during parsing."))
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sub_starts = []
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sub_ends = []
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sub_texts = []
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for sub in srt_subs_obj:
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sub_starts.append(sub.start.ordinal)
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sub_ends.append(sub.end.ordinal)
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sub_texts.append(sub.text.replace('\n', ' '))
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subs = {
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'start': sub_starts,
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'end': sub_ends,
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'text': sub_texts}
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for speed, subs_id in speed_subs.iteritems():
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save_subs_to_store(
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generate_subs(speed, 1, subs),
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subs_id,
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item,
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language
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)
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return subs
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def generate_srt_from_sjson(sjson_subs, speed):
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"""Generate transcripts with speed = 1.0 from sjson to SubRip (*.srt).
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:param sjson_subs: "sjson" subs.
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:param speed: speed of `sjson_subs`.
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:returns: "srt" subs.
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"""
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output = ''
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equal_len = len(sjson_subs['start']) == len(sjson_subs['end']) == len(sjson_subs['text'])
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if not equal_len:
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return output
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sjson_speed_1 = generate_subs(speed, 1, sjson_subs)
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for i in range(len(sjson_speed_1['start'])):
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item = SubRipItem(
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index=i,
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start=SubRipTime(milliseconds=sjson_speed_1['start'][i]),
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end=SubRipTime(milliseconds=sjson_speed_1['end'][i]),
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text=sjson_speed_1['text'][i]
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)
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output += (unicode(item))
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output += '\n'
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return output
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def copy_or_rename_transcript(new_name, old_name, item, delete_old=False, user=None):
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"""
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Renames `old_name` transcript file in storage to `new_name`.
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If `old_name` is not found in storage, raises `NotFoundError`.
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If `delete_old` is True, removes `old_name` files from storage.
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"""
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filename = 'subs_{0}.srt.sjson'.format(old_name)
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content_location = StaticContent.compute_location(item.location.course_key, filename)
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transcripts = contentstore().find(content_location).data
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save_subs_to_store(json.loads(transcripts), new_name, item)
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item.sub = new_name
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item.save_with_metadata(user)
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if delete_old:
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remove_subs_from_store(old_name, item)
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def get_html5_ids(html5_sources):
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"""
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Helper method to parse out an HTML5 source into the ideas
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NOTE: This assumes that '/' are not in the filename
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"""
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html5_ids = [x.split('/')[-1].rsplit('.', 1)[0] for x in html5_sources]
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return html5_ids
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def manage_video_subtitles_save(item, user, old_metadata=None, generate_translation=False):
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"""
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Does some specific things, that can be done only on save.
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Video player item has some video fields: HTML5 ones and Youtube one.
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If value of `sub` field of `new_item` is cleared, transcripts should be removed.
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`item` is video module instance with updated values of fields,
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but actually have not been saved to store yet.
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`old_metadata` contains old values of XFields.
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# 1.
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If value of `sub` field of `new_item` is different from values of video fields of `new_item`,
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and `new_item.sub` file is present, then code in this function creates copies of
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`new_item.sub` file with new names. That names are equal to values of video fields of `new_item`
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After that `sub` field of `new_item` is changed to one of values of video fields.
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This whole action ensures that after user changes video fields, proper `sub` files, corresponding
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to new values of video fields, will be presented in system.
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# 2 convert /static/filename.srt to filename.srt in self.transcripts.
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(it is done to allow user to enter both /static/filename.srt and filename.srt)
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# 3. Generate transcripts translation only when user clicks `save` button, not while switching tabs.
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a) delete sjson translation for those languages, which were removed from `item.transcripts`.
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Note: we are not deleting old SRT files to give user more flexibility.
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b) For all SRT files in`item.transcripts` regenerate new SJSON files.
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(To avoid confusing situation if you attempt to correct a translation by uploading
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a new version of the SRT file with same name).
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"""
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_ = item.runtime.service(item, "i18n").ugettext
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# 1.
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html5_ids = get_html5_ids(item.html5_sources)
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possible_video_id_list = [item.youtube_id_1_0] + html5_ids
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sub_name = item.sub
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for video_id in possible_video_id_list:
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if not video_id:
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continue
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if not sub_name:
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remove_subs_from_store(video_id, item)
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continue
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# copy_or_rename_transcript changes item.sub of module
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try:
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# updates item.sub with `video_id`, if it is successful.
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copy_or_rename_transcript(video_id, sub_name, item, user=user)
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except NotFoundError:
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# subtitles file `sub_name` is not presented in the system. Nothing to copy or rename.
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log.debug(
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"Copying %s file content to %s name is failed, "
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"original file does not exist.",
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sub_name, video_id
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)
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# 2.
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if generate_translation:
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for lang, filename in item.transcripts.items():
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item.transcripts[lang] = os.path.split(filename)[-1]
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# 3.
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if generate_translation:
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old_langs = set(old_metadata.get('transcripts', {})) if old_metadata else set()
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new_langs = set(item.transcripts)
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for lang in old_langs.difference(new_langs): # 3a
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for video_id in possible_video_id_list:
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if video_id:
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remove_subs_from_store(video_id, item, lang)
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reraised_message = ''
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for lang in new_langs: # 3b
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try:
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generate_sjson_for_all_speeds(
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item,
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item.transcripts[lang],
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{speed: subs_id for subs_id, speed in youtube_speed_dict(item).iteritems()},
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lang,
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)
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except TranscriptException as ex:
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item.transcripts.pop(lang) # remove key from transcripts because proper srt file does not exist in assets.
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reraised_message += ' ' + ex.message
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if reraised_message:
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item.save_with_metadata(user)
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raise TranscriptException(reraised_message)
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def youtube_speed_dict(item):
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"""
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Returns {speed: youtube_ids, ...} dict for existing youtube_ids
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"""
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yt_ids = [item.youtube_id_0_75, item.youtube_id_1_0, item.youtube_id_1_25, item.youtube_id_1_5]
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yt_speeds = [0.75, 1.00, 1.25, 1.50]
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youtube_ids = {p[0]: p[1] for p in zip(yt_ids, yt_speeds) if p[0]}
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return youtube_ids
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def subs_filename(subs_id, lang='en'):
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"""
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Generate proper filename for storage.
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"""
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if lang == 'en':
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return u'subs_{0}.srt.sjson'.format(subs_id)
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else:
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return u'{0}_subs_{1}.srt.sjson'.format(lang, subs_id)
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def generate_sjson_for_all_speeds(item, user_filename, result_subs_dict, lang):
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"""
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Generates sjson from srt for given lang.
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`item` is module object.
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"""
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_ = item.runtime.service(item, "i18n").ugettext
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try:
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srt_transcripts = contentstore().find(Transcript.asset_location(item.location, user_filename))
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except NotFoundError as ex:
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raise TranscriptException(_("{exception_message}: Can't find uploaded transcripts: {user_filename}").format(
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exception_message=ex.message,
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user_filename=user_filename
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))
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if not lang:
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lang = item.transcript_language
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# Used utf-8-sig encoding type instead of utf-8 to remove BOM(Byte Order Mark), e.g. U+FEFF
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generate_subs_from_source(
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result_subs_dict,
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os.path.splitext(user_filename)[1][1:],
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srt_transcripts.data.decode('utf-8-sig'),
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item,
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lang
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)
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def get_or_create_sjson(item, transcripts):
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"""
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Get sjson if already exists, otherwise generate it.
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Generate sjson with subs_id name, from user uploaded srt.
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Subs_id is extracted from srt filename, which was set by user.
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Args:
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transcipts (dict): dictionary of (language: file) pairs.
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Raises:
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TranscriptException: when srt subtitles do not exist,
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and exceptions from generate_subs_from_source.
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`item` is module object.
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"""
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user_filename = transcripts[item.transcript_language]
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user_subs_id = os.path.splitext(user_filename)[0]
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source_subs_id, result_subs_dict = user_subs_id, {1.0: user_subs_id}
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try:
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sjson_transcript = Transcript.asset(item.location, source_subs_id, item.transcript_language).data
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except NotFoundError: # generating sjson from srt
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generate_sjson_for_all_speeds(item, user_filename, result_subs_dict, item.transcript_language)
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sjson_transcript = Transcript.asset(item.location, source_subs_id, item.transcript_language).data
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return sjson_transcript
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class Transcript(object):
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"""
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Container for transcript methods.
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"""
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mime_types = {
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'srt': 'application/x-subrip; charset=utf-8',
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'txt': 'text/plain; charset=utf-8',
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'sjson': 'application/json',
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}
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@staticmethod
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def convert(content, input_format, output_format):
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"""
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Convert transcript `content` from `input_format` to `output_format`.
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Accepted input formats: sjson, srt.
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Accepted output format: srt, txt.
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"""
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assert input_format in ('srt', 'sjson')
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assert output_format in ('txt', 'srt', 'sjson')
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if input_format == output_format:
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return content
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if input_format == 'srt':
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if output_format == 'txt':
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text = SubRipFile.from_string(content.decode('utf8')).text
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return HTMLParser().unescape(text)
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elif output_format == 'sjson':
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raise NotImplementedError
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|
if input_format == 'sjson':
|
|
|
|
if output_format == 'txt':
|
|
text = json.loads(content)['text']
|
|
return HTMLParser().unescape("\n".join(text))
|
|
|
|
elif output_format == 'srt':
|
|
return generate_srt_from_sjson(json.loads(content), speed=1.0)
|
|
|
|
@staticmethod
|
|
def asset(location, subs_id, lang='en', filename=None):
|
|
"""
|
|
Get asset from contentstore, asset location is built from subs_id and lang.
|
|
|
|
`location` is module location.
|
|
"""
|
|
asset_filename = subs_filename(subs_id, lang) if not filename else filename
|
|
return Transcript.get_asset(location, asset_filename)
|
|
|
|
@staticmethod
|
|
def get_asset(location, filename):
|
|
"""
|
|
Return asset by location and filename.
|
|
"""
|
|
return contentstore().find(Transcript.asset_location(location, filename))
|
|
|
|
@staticmethod
|
|
def asset_location(location, filename):
|
|
"""
|
|
Return asset location. `location` is module location.
|
|
"""
|
|
return StaticContent.compute_location(location.course_key, filename)
|
|
|
|
@staticmethod
|
|
def delete_asset(location, filename):
|
|
"""
|
|
Delete asset by location and filename.
|
|
"""
|
|
try:
|
|
contentstore().delete(Transcript.asset_location(location, filename))
|
|
log.info("Transcript asset %s was removed from store.", filename)
|
|
except NotFoundError:
|
|
pass
|
|
return StaticContent.compute_location(location.course_key, filename)
|
|
|
|
|
|
class VideoTranscriptsMixin(object):
|
|
"""Mixin class for transcript functionality.
|
|
|
|
This is necessary for both VideoModule and VideoDescriptor.
|
|
"""
|
|
|
|
def available_translations(self, transcripts, verify_assets=True):
|
|
"""Return a list of language codes for which we have transcripts.
|
|
|
|
Args:
|
|
verify_assets (boolean): If True, checks to ensure that the transcripts
|
|
really exist in the contentstore. If False, we just look at the
|
|
VideoDescriptor fields and do not query the contentstore. One reason
|
|
we might do this is to avoid slamming contentstore() with queries
|
|
when trying to make a listing of videos and their languages.
|
|
|
|
Defaults to True.
|
|
|
|
transcripts (dict): A dict with all transcripts and a sub.
|
|
|
|
Defaults to False
|
|
"""
|
|
translations = []
|
|
sub, other_lang = transcripts["sub"], transcripts["transcripts"]
|
|
|
|
# If we're not verifying the assets, we just trust our field values
|
|
if not verify_assets:
|
|
translations = list(other_lang)
|
|
if not translations or sub:
|
|
translations += ['en']
|
|
return set(translations)
|
|
|
|
# If we've gotten this far, we're going to verify that the transcripts
|
|
# being referenced are actually in the contentstore.
|
|
if sub: # check if sjson exists for 'en'.
|
|
try:
|
|
Transcript.asset(self.location, sub, 'en')
|
|
except NotFoundError:
|
|
try:
|
|
Transcript.asset(self.location, None, None, sub)
|
|
except NotFoundError:
|
|
pass
|
|
else:
|
|
translations = ['en']
|
|
else:
|
|
translations = ['en']
|
|
|
|
for lang in other_lang:
|
|
try:
|
|
Transcript.asset(self.location, None, None, other_lang[lang])
|
|
except NotFoundError:
|
|
continue
|
|
translations.append(lang)
|
|
|
|
return translations
|
|
|
|
def get_transcript(self, transcripts, transcript_format='srt', lang=None):
|
|
"""
|
|
Returns transcript, filename and MIME type.
|
|
|
|
transcripts (dict): A dict with all transcripts and a sub.
|
|
|
|
Raises:
|
|
- NotFoundError if cannot find transcript file in storage.
|
|
- ValueError if transcript file is empty or incorrect JSON.
|
|
- KeyError if transcript file has incorrect format.
|
|
|
|
If language is 'en', self.sub should be correct subtitles name.
|
|
If language is 'en', but if self.sub is not defined, this means that we
|
|
should search for video name in order to get proper transcript (old style courses).
|
|
If language is not 'en', give back transcript in proper language and format.
|
|
"""
|
|
if not lang:
|
|
lang = self.get_default_transcript_language(transcripts)
|
|
|
|
sub, other_lang = transcripts["sub"], transcripts["transcripts"]
|
|
if lang == 'en':
|
|
if sub: # HTML5 case and (Youtube case for new style videos)
|
|
transcript_name = sub
|
|
elif self.youtube_id_1_0: # old courses
|
|
transcript_name = self.youtube_id_1_0
|
|
else:
|
|
log.debug("No subtitles for 'en' language")
|
|
raise ValueError
|
|
|
|
data = Transcript.asset(self.location, transcript_name, lang).data
|
|
filename = u'{}.{}'.format(transcript_name, transcript_format)
|
|
content = Transcript.convert(data, 'sjson', transcript_format)
|
|
else:
|
|
data = Transcript.asset(self.location, None, None, other_lang[lang]).data
|
|
filename = u'{}.{}'.format(os.path.splitext(other_lang[lang])[0], transcript_format)
|
|
content = Transcript.convert(data, 'srt', transcript_format)
|
|
|
|
if not content:
|
|
log.debug('no subtitles produced in get_transcript')
|
|
raise ValueError
|
|
|
|
return content, filename, Transcript.mime_types[transcript_format]
|
|
|
|
def get_default_transcript_language(self, transcripts):
|
|
"""
|
|
Returns the default transcript language for this video module.
|
|
|
|
Args:
|
|
transcripts (dict): A dict with all transcripts and a sub.
|
|
"""
|
|
sub, other_lang = transcripts["sub"], transcripts["transcripts"]
|
|
if self.transcript_language in other_lang:
|
|
transcript_language = self.transcript_language
|
|
elif sub:
|
|
transcript_language = u'en'
|
|
elif len(other_lang) > 0:
|
|
transcript_language = sorted(other_lang)[0]
|
|
else:
|
|
transcript_language = u'en'
|
|
return transcript_language
|
|
|
|
def get_transcripts_info(self, is_bumper=False):
|
|
"""
|
|
Returns a transcript dictionary for the video.
|
|
"""
|
|
if is_bumper:
|
|
transcripts = copy.deepcopy(get_bumper_settings(self).get('transcripts', {}))
|
|
return {
|
|
"sub": transcripts.pop("en", ""),
|
|
"transcripts": transcripts,
|
|
}
|
|
else:
|
|
return {
|
|
"sub": self.sub,
|
|
"transcripts": self.transcripts,
|
|
}
|