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bfe_video_platform_downloads.py
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Thu, Jun 27, 05:29

bfe_video_platform_downloads.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
* Generates a list of links to download videos directly
* The list includes the codec/container, subformat/resolution and file size
"""
from invenio.bibdocfile import BibRecDocs
html_skeleton_popup = """<!-- DOWNLOAD POPUP -->
<div id="video_download_popup_box">
%(elements)s
</div>
"""
html_skeleton_element = """<!-- DOWNLOAD POPUP ELEMENT -->
<div class="video_download_popup_element">
<a href="%(video_url)s">
<div class="video_download_popup_element_codec">
%(video_codec)s
</div>
<div class="video_download_popup_element_filesize">
%(video_size)s
</div>
<div class="video_download_popup_element_resolution">
%(video_resolution)s
</div>
</a>
</div>
"""
def format_element(bfo):
"""Format Element Function"""
return create_download_popup(bfo)
def create_download_popup(bfo):
"""Create the complete download popup"""
elements = []
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 it as an element
if bibdocfile.get_superformat() in ('.mp4', '.webm', '.ogv',
'.mov', '.wmv', '.avi',
'.mpeg', '.flv', '.mkv'):
url = bibdocfile.get_url()
codec = bibdocfile.get_superformat()[1:]
resolution = bibdocfile.get_subformat()
size = bibdocfile.get_size()
elements.append(create_download_element(url, codec,
size, resolution))
if elements:
return html_skeleton_popup % {
'elements': "\n".join(elements)
}
else:
return ""
def create_download_element(url, codec, size, resolution):
"""Creates an HTML element based on the element skeleton"""
return html_skeleton_element % {
'video_url': url + "&download=1",
'video_codec': codec.upper(),
'video_size': human_size(size),
'video_resolution': resolution
}
def human_size(byte_size):
for x in ['bytes','KB','MB','GB','TB']:
if byte_size < 1024.0:
return "%3.1f %s" % (byte_size, x)
byte_size /= 1024.0
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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