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[channel9] Initial implementation (#1885)
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351
youtube_dl/extractor/channel9.py
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351
youtube_dl/extractor/channel9.py
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# encoding: utf-8
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import re
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from .common import InfoExtractor
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from ..utils import (
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format_bytes,
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ExtractorError,
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)
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class Channel9IE(InfoExtractor):
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'''
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Common extractor for channel9.msdn.com.
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The type of provided URL (video or playlist) is determined according to
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meta Search.PageType from web page HTML rather than URL itself, as it is
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not always possible to do.
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'''
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IE_DESC = u'Channel 9'
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IE_NAME = u'channel9'
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_VALID_URL = r'^https?://(?:www\.)?channel9\.msdn\.com/(?P<contentpath>.+)/?'
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_TESTS = [
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{
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u'url': u'http://channel9.msdn.com/Events/TechEd/Australia/2013/KOS002',
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u'file': u'Events_TechEd_Australia_2013_KOS002.mp4',
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u'md5': u'bbd75296ba47916b754e73c3a4bbdf10',
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u'info_dict': {
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u'title': u'Developer Kick-Off Session: Stuff We Love',
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u'description': u'md5:c08d72240b7c87fcecafe2692f80e35f',
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u'duration': 4576,
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u'thumbnail': u'http://media.ch9.ms/ch9/9d51/03902f2d-fc97-4d3c-b195-0bfe15a19d51/KOS002_220.jpg',
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u'session_code': u'KOS002',
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u'session_day': u'Day 1',
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u'session_room': u'Arena 1A',
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u'session_speakers': [ u'Ed Blankenship', u'Andrew Coates', u'Brady Gaster', u'Patrick Klug', u'Mads Kristensen' ],
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},
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},
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{
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u'url': u'http://channel9.msdn.com/posts/Self-service-BI-with-Power-BI-nuclear-testing',
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u'file': u'posts_Self-service-BI-with-Power-BI-nuclear-testing.mp4',
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u'md5': u'b43ee4529d111bc37ba7ee4f34813e68',
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u'info_dict': {
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u'title': u'Self-service BI with Power BI - nuclear testing',
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u'description': u'md5:a6d5cfd9ee46d1851cf6e40ea61cfc10',
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u'duration': 1540,
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u'thumbnail': u'http://media.ch9.ms/ch9/87e1/0300391f-a455-4c72-bec3-4422f19287e1/selfservicenuk_512.jpg',
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u'authors': [ u'Mike Wilmot' ],
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},
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}
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]
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_RSS_URL = 'http://channel9.msdn.com/%s/RSS'
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_EXTRACT_ENTRY_ITEMS_FROM_RSS = False
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# Sorted by quality
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_known_formats = ['MP3', 'MP4', 'Mid Quality WMV', 'Mid Quality MP4', 'High Quality WMV', 'High Quality MP4']
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def _restore_bytes(self, formatted_size):
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if not formatted_size:
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return 0
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m = re.match(r'^(?P<size>\d+(?:\.\d+)?)\s+(?P<units>[a-zA-Z]+)', formatted_size)
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if not m:
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return 0
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units = m.group('units')
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try:
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exponent = [u'B', u'KB', u'MB', u'GB', u'TB', u'PB', u'EB', u'ZB', u'YB'].index(units.upper())
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except ValueError:
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return 0
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size = float(m.group('size'))
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return int(size * (1024 ** exponent))
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def _formats_from_html(self, html):
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FORMAT_REGEX = r'''
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(?x)
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<a\s+href="(?P<url>[^"]+)">(?P<quality>[^<]+)</a>\s*
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<span\s+class="usage">\((?P<note>[^\)]+)\)</span>\s*
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(?:<div\s+class="popup\s+rounded">\s*
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<h3>File\s+size</h3>\s*(?P<filesize>.*?)\s*
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</div>)? # File size part may be missing
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'''
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# Extract known formats
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formats = [{'url': x.group('url'),
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'format_id': x.group('quality'),
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'format_note': x.group('note'),
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'format': '%s (%s)' % (x.group('quality'), x.group('note')),
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'filesize': self._restore_bytes(x.group('filesize')), # File size is approximate
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} for x in list(re.finditer(FORMAT_REGEX, html)) if x.group('quality') in self._known_formats]
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# Sort according to known formats list
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formats.sort(key=lambda fmt: self._known_formats.index(fmt['format_id']))
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return formats
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def _formats_from_rss_item(self, item):
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def process_formats(elem):
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formats = []
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for media_content in elem.findall('./{http://search.yahoo.com/mrss/}content'):
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url = media_content.attrib['url']
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# Ignore unrelated media
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if url.endswith('.ism/manifest'):
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continue
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format_note = media_content.attrib['type']
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filesize = int(media_content.attrib['fileSize'])
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formats.append({'url': url,
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'format_note': format_note,
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'format': '%s %s' % (format_note, format_bytes(filesize)),
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'filesize': filesize,
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})
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return formats
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formats = []
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for media_group in item.findall('./{http://search.yahoo.com/mrss/}group'):
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formats.extend(process_formats(media_group))
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# Sometimes there are no media:groups in item, but there is media:content
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# right in item (usually when there is the only media source)
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formats.extend(process_formats(item))
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# Sort by file size
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formats.sort(key=lambda fmt: fmt['filesize'])
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return formats
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def _extract_title(self, html):
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title = self._html_search_meta(u'title', html, u'title')
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if title is None:
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title = self._og_search_title(html)
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TITLE_SUFFIX = u' (Channel 9)'
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if title is not None and title.endswith(TITLE_SUFFIX):
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title = title[:-len(TITLE_SUFFIX)]
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return title
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def _extract_description(self, html):
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DESCRIPTION_REGEX = r'''(?sx)
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<div\s+class="entry-content">\s*
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<div\s+id="entry-body">\s*
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(?P<description>.+?)\s*
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</div>\s*
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</div>
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'''
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m = re.search(DESCRIPTION_REGEX, html)
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if m is not None:
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return m.group('description')
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return self._html_search_meta(u'description', html, u'description')
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def _extract_duration(self, html):
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m = re.search(r'data-video_duration="(?P<hours>\d{2}):(?P<minutes>\d{2}):(?P<seconds>\d{2})"', html)
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return ((int(m.group('hours')) * 60 * 60) + (int(m.group('minutes')) * 60) + int(m.group('seconds'))) if m else None
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def _extract_slides(self, html):
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m = re.search(r'<a href="(?P<slidesurl>[^"]+)" class="slides">Slides</a>', html)
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return m.group('slidesurl') if m is not None else None
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def _extract_zip(self, html):
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m = re.search(r'<a href="(?P<zipurl>[^"]+)" class="zip">Zip</a>', html)
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return m.group('zipurl') if m is not None else None
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def _extract_avg_rating(self, html):
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m = re.search(r'<p class="avg-rating">Avg Rating: <span>(?P<avgrating>[^<]+)</span></p>', html)
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return float(m.group('avgrating')) if m is not None else 0
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def _extract_rating_count(self, html):
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m = re.search(r'<div class="rating-count">\((?P<ratingcount>[^<]+)\)</div>', html)
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return int(self._fix_count(m.group('ratingcount'))) if m is not None else 0
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def _extract_view_count(self, html):
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m = re.search(r'<li class="views">\s*<span class="count">(?P<viewcount>[^<]+)</span> Views\s*</li>', html)
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return int(self._fix_count(m.group('viewcount'))) if m is not None else 0
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def _extract_comment_count(self, html):
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m = re.search(r'<li class="comments">\s*<a href="#comments">\s*<span class="count">(?P<commentcount>[^<]+)</span> Comments\s*</a>\s*</li>', html)
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return int(self._fix_count(m.group('commentcount'))) if m is not None else 0
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def _fix_count(self, count):
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return int(str(count).replace(',', '')) if count is not None else None
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def _extract_authors(self, html):
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m = re.search(r'(?s)<li class="author">(.*?)</li>', html)
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if m is None:
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return None
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return re.findall(r'<a href="/Niners/[^"]+">([^<]+)</a>', m.group(1))
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def _extract_session_code(self, html):
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m = re.search(r'<li class="code">\s*(?P<code>.+?)\s*</li>', html)
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return m.group('code') if m is not None else None
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def _extract_session_day(self, html):
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m = re.search(r'<li class="day">\s*<a href="/Events/[^"]+">(?P<day>[^<]+)</a>\s*</li>', html)
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return m.group('day') if m is not None else None
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def _extract_session_room(self, html):
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m = re.search(r'<li class="room">\s*(?P<room>.+?)\s*</li>', html)
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return m.group('room') if m is not None else None
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def _extract_session_speakers(self, html):
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return re.findall(r'<a href="/Events/Speakers/[^"]+">([^<]+)</a>', html)
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def _extract_content(self, html, content_path):
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# Look for downloadable content
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formats = self._formats_from_html(html)
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slides = self._extract_slides(html)
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zip_ = self._extract_zip(html)
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# Nothing to download
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if len(formats) == 0 and slides is None and zip_ is None:
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self._downloader.report_warning(u'None of recording, slides or zip are available for %s' % content_path)
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return
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# Extract meta
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title = self._extract_title(html)
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description = self._extract_description(html)
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thumbnail = self._og_search_thumbnail(html)
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duration = self._extract_duration(html)
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avg_rating = self._extract_avg_rating(html)
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rating_count = self._extract_rating_count(html)
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view_count = self._extract_view_count(html)
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comment_count = self._extract_comment_count(html)
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common = {'_type': 'video',
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'id': content_path,
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'description': description,
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'thumbnail': thumbnail,
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'duration': duration,
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'avg_rating': avg_rating,
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'rating_count': rating_count,
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'view_count': view_count,
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'comment_count': comment_count,
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}
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result = []
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if slides is not None:
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d = common.copy()
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d.update({ 'title': title + '-Slides', 'url': slides })
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result.append(d)
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if zip_ is not None:
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d = common.copy()
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d.update({ 'title': title + '-Zip', 'url': zip_ })
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result.append(d)
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if len(formats) > 0:
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d = common.copy()
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d.update({ 'title': title, 'formats': formats })
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result.append(d)
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return result
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def _extract_entry_item(self, html, content_path):
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contents = self._extract_content(html, content_path)
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if contents is None:
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return contents
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authors = self._extract_authors(html)
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for content in contents:
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content['authors'] = authors
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return contents
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def _extract_session(self, html, content_path):
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contents = self._extract_content(html, content_path)
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if contents is None:
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return contents
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session_meta = {'session_code': self._extract_session_code(html),
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'session_day': self._extract_session_day(html),
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'session_room': self._extract_session_room(html),
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'session_speakers': self._extract_session_speakers(html),
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}
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for content in contents:
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content.update(session_meta)
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return contents
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def _extract_content_rss(self, rss):
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'''
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Extracts links to entry items right out of RSS feed.
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This approach is faster than extracting from web pages
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one by one, but suffers from some problems.
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Pros:
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- no need to download additional pages
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- provides more media links
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- accurate file size
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Cons:
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- fewer meta data provided
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- links to media files have no appropriate data that may be used as format_id
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- RSS does not contain links to presentation materials (slides, zip)
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'''
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entries = []
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for item in rss.findall('./channel/item'):
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url = item.find('./link').text
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video_id = url.split('/')[-1]
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formats = self._formats_from_rss_item(item)
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if len(formats) == 0:
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self._downloader.report_warning(u'The recording for session %s is not yet available' % video_id)
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continue
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title = item.find('./title').text
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description = item.find('./description').text
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thumbnail = item.find('./{http://search.yahoo.com/mrss/}thumbnail').text
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duration_e = item.find('./{http://www.itunes.com/dtds/podcast-1.0.dtd}duration')
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duration = duration_e.text if duration_e is not None else 0
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speakers_e = item.find('./{http://purl.org/dc/elements/1.1/}creator')
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speakers = speakers_e.text.split(', ') if speakers_e is not None and speakers_e.text else []
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entries.append({'_type': 'video',
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'id': video_id,
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'formats': formats,
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'title': title,
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'description': description,
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'thumbnail': thumbnail,
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'duration': duration,
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'session_speakers': speakers,
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})
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return entries
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def _extract_list(self, content_path):
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rss = self._download_xml(self._RSS_URL % content_path, content_path, u'Downloading RSS')
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if self._EXTRACT_ENTRY_ITEMS_FROM_RSS:
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return self._extract_content_rss(rss)
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else:
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entries = [self.url_result(session_url.text, 'Channel9')
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for session_url in rss.findall('./channel/item/link')]
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title_text = rss.find('./channel/title').text
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return self.playlist_result(entries, content_path, title_text)
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def _real_extract(self, url):
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mobj = re.match(self._VALID_URL, url)
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content_path = mobj.group('contentpath')
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webpage = self._download_webpage(url, content_path, u'Downloading web page')
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page_type_m = re.search(r'<meta name="Search.PageType" content="(?P<pagetype>[^"]+)"/>', webpage)
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if page_type_m is None:
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raise ExtractorError(u'Search.PageType not found, don\'t know how to process this page', expected=True)
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page_type = page_type_m.group('pagetype')
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if page_type == 'List': # List page, may contain list of 'item'-like objects
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return self._extract_list(content_path)
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elif page_type == 'Entry.Item': # Any 'item'-like page, may contain downloadable content
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return self._extract_entry_item(webpage, content_path)
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elif page_type == 'Session': # Event session page, may contain downloadable content
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return self._extract_session(webpage, content_path)
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else:
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raise ExtractorError(u'Unexpected Search.PageType %s' % page_type, expected=True)
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