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bbb.py
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bbb.py
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#!/usr/bin/env python3
# coding: utf-8
# This file originally contributed by Olivier Berger <olivier.berger@telecom-sudparis.eu> for youtube-dl, and adapted for our needs
# BigBlueButton records multiple videos :
# - webcams feed : sound & webcam views : useful for extracting sound
# - deskshare captures : screensharing, but not the slides
# For slides, annotations, polls and other stuff displayed to the
# audience the playback app typically renders them on the fly upon
# playback (SVG) so it may not be easy to capture that with youtube-dl
from __future__ import unicode_literals
import sys
import re
import urllib
import urllib.request
import xml.etree.ElementTree as ET
from pprint import pprint
import time
from datetime import datetime, timedelta, timezone
# import pytz
# from .common import InfoExtractor
# from ..utils import (
# xpath_text,
# xpath_with_ns,
# )
def xpath_with_ns(path, ns_map):
components = [c.split(':') for c in path.split('/')]
replaced = []
for c in components:
if len(c) == 1:
replaced.append(c[0])
else:
ns, tag = c
replaced.append('{%s}%s' % (ns_map[ns], tag))
return '/'.join(replaced)
_s = lambda p: xpath_with_ns(p, {'svg': 'http://www.w3.org/2000/svg'})
_x = lambda p: xpath_with_ns(p, {'xlink': 'http://www.w3.org/1999/xlink'})
class BigBlueButtonExtractor:
_VALID_URL = r'(?P<website>https?://[^/]+)/playback/presentation/(?P<version>[0-9.]+)/playback.html\?meetingId=(?P<id>[0-9a-f\-]+)'
_VALID_URL2 = r'(?P<website>https?://[^/]+)/playback/presentation/(?P<version>[0-9.]+)/(?P<id>[0-9a-f\-]+).*'
_TIMESTAMP_UNIT = 30000
def _real_extract(self, url):
self._VALID_URL_RE = re.compile(self._VALID_URL)
m = self._VALID_URL_RE.match(url)
if m is None:
self._VALID_URL_RE = re.compile(self._VALID_URL2)
m = self._VALID_URL_RE.match(url)
if m is None:
sys.stderr.write(url + " is not a BBB video\n")
sys.exit(1);
self.website = m.group('website')
video_id = m.group('id')
# Extract basic metadata (more available in metadata.xml)
self.metadata_url = self.website + '/presentation/' + video_id + '/metadata.xml'
metadata = urllib.request.urlopen(self.metadata_url).read().decode()
root = ET.fromstring(metadata)
# id = xpath_text(metadata, 'id')
self.id = root.find('id').text
meta = root.find('./meta')
self.meeting_name = meta.find('meetingName').text
self.start_time = int(root.find('start_time').text)
self.end_time = int(root.find('end_time').text)
playback = root.find('./playback')
if not playback is None:
# The duration (in ms) is specified in the playback section of the metadata
duration = int(playback.find('duration').text)
self.duration = int(duration/1000)
else:
# If duration is not found, we need to compute it based on the start/end date.
# It is probably not accurate (esp. if the recording is paused), but that's better
# than nothing
self.duration = int(float(self.end_time-self.start_time)/self._TIMESTAMP_UNIT)
# This code unused : have to grasp what to do with thumbnails
self.thumbnails = []
images = root.find('./playback/extensions/preview/images')
if not images is None:
for image in images:
self.thumbnails.append({
'url': image.text.strip(),
'width': image.get('width'),
'height': image.get('height')
})
# This code mostly useless unless one know how to process slides
shapes_url = self.website + '/presentation/' + video_id + '/shapes.svg'
#print(shapes_url)
shapes_text = urllib.request.urlopen(shapes_url).read().decode()
shapes = ET.fromstring(shapes_text)
images = shapes.findall(_s("./svg:image[@class='slide']"))
self.slides = []
for image in images:
self.slides.append(image.get(_x('xlink:href')))
# We produce 2 formats :
# - the 'webcams.webm' one, for webcams (can be used for merging its audio)
# - the 'deskshare.webm' one, for screen sharing (can be used
# for merging its video) - it lacks the slides, unfortunately
self.formats = []
sources = {
'webcams': '/video/webcams.webm',
'deskshare': '/deskshare/deskshare.webm'
}
for format_id, source in sources.items():
video_url = self.website + '/presentation/' + video_id + source
self.formats.append({
'url': video_url,
'format_id': format_id
})
if __name__ == '__main__' :
if len(sys.argv) == 2 :
url=sys.argv[1]
else:
url=sys.argv[2]
extractor = BigBlueButtonExtractor()
extractor._real_extract(url)
if len(sys.argv) == 2 :
pprint(extractor.__dict__)
else:
attrval = getattr(extractor, sys.argv[1])
print(attrval)