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bfe_video_platform_sources.py
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Fri, Jun 28, 12:41

bfe_video_platform_sources.py
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# -*- coding: utf-8 -*-
##
## This file is part of Invenio.
## Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 CERN.
##
## Invenio is free software; you can redistribute it and/or
## modify it under the terms of the GNU General Public License as
## published by the Free Software Foundation; either version 2 of the
## License, or (at your option) any later version.
##
## Invenio is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Invenio; if not, write to the Free Software Foundation, Inc.,
## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
"""BibFormat element
* Part of the video platform prototype
* Creates a <select> element with <option> elements
containing various information about video sources. The options are later
evaluated by javascript and the video source is dynamically injected in the
HTML5 video element.
* Based on bfe_video_selector.py
"""
from invenio.bibdocfile import BibRecDocs
def format_element(bfo):
""" Format element function to create the select and option elements
with HTML5 data attributes that store all the necesarry metadata to
construct video sources with JavaScript."""
videos = {
'360p': {'width': 640, 'height': 360, 'poster': None, 'mp4': None, 'webm': None, 'ogv': None},
'480p': {'width': 854,'height': 480, 'poster': None, 'mp4': None, 'webm': None, 'ogv': None,},
'720p': {'width': 1280, 'height': 720, 'poster': None, 'mp4': None, 'webm': None, 'ogv': None},
'1080p': {'width': 1920, 'height': 1080, 'poster': None, 'mp4': None, 'webm': None, 'ogv': None}
}
recdoc = BibRecDocs(bfo.recID)
bibdocs = recdoc.list_bibdocs()
## Go through all the BibDocs and search for video related signatures
for bibdoc in bibdocs:
bibdocfiles = bibdoc.list_all_files()
for bibdocfile in bibdocfiles:
## When a video signature is found, add the url to the videos dictionary
if bibdocfile.get_superformat() in ('.mp4', '.webm', '.ogv') and bibdocfile.get_subformat() in ('360p', '480p', '720p', '1080p'):
src = bibdocfile.get_url()
codec = bibdocfile.get_superformat()[1:]
size = bibdocfile.get_subformat()
videos[size][codec] = src
## When a poster signature is found, add the url to the videos dictionary
elif bibdocfile.get_comment() in ('SUGGESTIONTUMB', 'BIGTHUMB', 'POSTER', 'SMALLTHUMB') and bibdocfile.get_subformat() in ('360p', '480p', '720p', '1080p'):
src = bibdocfile.get_url()
size = bibdocfile.get_subformat()
videos[size]['poster'] = src
## Build video select options for every video size format that was found
select_options = []
for key, options in videos.iteritems():
## If we have at least one url, the format is available
if options['mp4'] or options['webm'] or options['ogv']:
## create am option element
option_element = create_option_element(url_webm=options['webm'], url_ogv=options['ogv'], url_mp4=options['mp4'],
url_poster=options['poster'], width=options['width'], height=options['height'],
subformat=key)
select_options.append(option_element)
select_element = create_select_element(select_options)
return select_element
def create_select_element(options):
""" Creates the HTML select element that carries the video format options
"""
text = """<select id="mejs-resolution">
%s
</select>
""" % '\n'.join(options)
return text
def create_option_element(width, height, subformat, url_webm=None, url_ogv=None, url_mp4=None, url_poster=None,):
""" Creates an HTML option element that carries all video information
"""
if url_webm:
webm = """data-src-webm="%s" data-type-webm='video/webm; codecs="vp8, vorbis"'""" % url_webm
else:
webm = ""
if url_ogv:
ogv = """data-src-ogg="%s" data-type-ogv='video/ogv; codecs="theora, vorbis"'""" % url_ogv
else:
ogv = ""
if url_mp4:
mp4 = """data-src-mp4="%s" data-type-mp4='video/mp4; codecs="avc1.42E01E, mp4a.40.2"'""" % url_mp4
else:
mp4 = ""
text = """<option %(webm)s %(ogv)s %(mp4)s data-poster="%(url_poster)s" data-video-width="%(width)spx" data-video-height="%(height)spx">%(subformat)s</option>""" % {
'webm': webm,
'ogv': ogv,
'mp4': mp4,
'url_poster': url_poster,
'width': width,
'height': height,
'subformat': subformat
}
return text
def escape_values(bfo):
"""
Called by BibFormat in order to check if output of this element
should be escaped.
"""
return 0

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