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bfe_duration.py
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Wed, Jul 10, 13:19

bfe_duration.py
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# -*- coding: utf-8 -*-
##
## This file is part of Invenio.
## Copyright (C) 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 - Display the duration of a media file
"""
__revision__ = "$Id$"
import re
re_duration = re.compile('(\s|\A)(((?P<hours>\d{1,2}):)?(?P<minutes>\d{1,2}):(?P<seconds>\d\d))(\s|\Z)')
def format_element(bfo, input_units="m", output_format="%(H)02i:%(M)02i:%(S)02i"):
"""
Display the duration of a media file (300__a).
@param input_units: if field 300__a is digit, expect it to be:
- s: seconds
- m: minutes
- h: hours
If field 300__a is not digit, expect it to contain some variant of HH:MM:SS
@param output_format: how to display the duration. A basic Pythonic string replacement is
done on the input string. You can use the following keys:
- H: The number of hours
- M: The number of minutes
- S: The number of seconds
- H: The total number of hours
- M: The total number of minutes
- S: The total number of seconds
"""
# Get the duration
duration_in_seconds = None
duration = bfo.field('300__a')
try:
int_duration = int(float(duration))
if input_units == 's':
duration_in_seconds = int_duration
elif input_units == 'm':
duration_in_seconds = int_duration * 60
elif input_units == 'h':
duration_in_seconds = int_duration * 3600
except Exception as e:
pass
if duration_in_seconds is None:
# Try to find something like HH:MM:SS
match_obj = re_duration.match(duration)
if match_obj:
seconds = int(match_obj.group('seconds'))
minutes = int(match_obj.group('minutes'))
hours = match_obj.group('hours')
if not hours:
hours = 0
else:
hours = int(hours)
duration_in_seconds = seconds + (60 * minutes) + (360 * hours)
# Output the duration
if duration_in_seconds:
return output_format % {'H': duration_in_seconds / 3600,
'M': (duration_in_seconds / 60) % 60,
'S': duration_in_seconds % 60,
'h': duration_in_seconds / 3600.0, # Absolute nb of hours
'm': duration_in_seconds / 60.0, # Absolute nb of minutes
's': duration_in_seconds #Absolute nb of seconds
}

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