113 lines
3.5 KiB
Python
113 lines
3.5 KiB
Python
# -*- Mode: Python; py-indent-offset: 4 -*-
|
|
# vim: tabstop=4 shiftwidth=4 expandtab
|
|
#
|
|
# Copyright (C) 2012 Robert Park <r@robru.ca>
|
|
#
|
|
# This library is free software; you can redistribute it and/or
|
|
# modify it under the terms of the GNU Lesser General Public
|
|
# License as published by the Free Software Foundation; either
|
|
# version 2.1 of the License, or (at your option) any later version.
|
|
#
|
|
# This library 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
|
|
# Lesser General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU Lesser General Public
|
|
# License along with this library; if not, write to the Free Software
|
|
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
|
|
# USA
|
|
|
|
from datetime import datetime
|
|
from fractions import Fraction
|
|
|
|
from gi.repository import GObject
|
|
from ..overrides import override
|
|
from ..module import get_introspection_module
|
|
|
|
GExiv2 = get_introspection_module('GExiv2')
|
|
|
|
__all__ = []
|
|
|
|
DATE_FORMAT = '%Y:%m:%d %H:%M:%S'
|
|
MAX_INT = 2**31 - 1
|
|
|
|
@override
|
|
class Metadata(GExiv2.Metadata):
|
|
def __init__(self, path=None):
|
|
super(Metadata, self).__init__()
|
|
self._path = path
|
|
if path is not None:
|
|
self.open_path(path)
|
|
|
|
def open_path(self, path):
|
|
self._path = path
|
|
super(Metadata, self).open_path(path)
|
|
|
|
def save_file(self, path=None):
|
|
super(Metadata, self).save_file(path or self._path)
|
|
|
|
def get_date_time(self):
|
|
datestring = self['Exif.Photo.DateTimeOriginal']
|
|
if datestring is not None:
|
|
return datetime.strptime(datestring, DATE_FORMAT)
|
|
|
|
def set_date_time(self, value):
|
|
self['Exif.Photo.DateTimeOriginal'] = value.strftime(DATE_FORMAT)
|
|
|
|
def get_exposure_time(self):
|
|
num, denom = super(Metadata, self).get_exposure_time()
|
|
return Fraction(num, denom) if denom else None
|
|
|
|
def get_exif_tag_rational(self, key):
|
|
num, denom = super(Metadata, self).get_exif_tag_rational(key)
|
|
return Fraction(num, denom) if denom else None
|
|
|
|
def set_exif_tag_rational(self, key, fraction):
|
|
limit = MAX_INT
|
|
while True:
|
|
try:
|
|
return super(Metadata, self).set_exif_tag_rational(
|
|
key, fraction.numerator, fraction.denominator)
|
|
except ValueError:
|
|
fraction = fraction.limit_denominator(limit)
|
|
limit = int(limit / 2)
|
|
|
|
def get_tags(self):
|
|
return self.get_exif_tags() + self.get_iptc_tags() + self.get_xmp_tags()
|
|
|
|
def get(self, key, default=None):
|
|
return self.get_tag_string(key) if self.has_tag(key) else default
|
|
|
|
def get_raw(self, key):
|
|
return self.get_tag_raw(key).get_data()
|
|
|
|
def __iter__(self):
|
|
return iter(self.get_tags())
|
|
|
|
def __contains__(self, key):
|
|
return self.has_tag(key)
|
|
|
|
def __len__(self):
|
|
return len(self.get_tags())
|
|
|
|
def __getitem__(self, key):
|
|
if self.has_tag(key):
|
|
return self.get_tag_string(key)
|
|
else:
|
|
raise KeyError('%s: Unknown tag' % key)
|
|
|
|
def __delitem__(self, key):
|
|
if self.has_tag(key):
|
|
self.clear_tag(key)
|
|
else:
|
|
raise KeyError('%s: Unknown tag' % key)
|
|
|
|
__setitem__ = GExiv2.Metadata.set_tag_string
|
|
|
|
__all__.append('Metadata')
|
|
|
|
if not GExiv2.initialize():
|
|
raise RuntimeError("GExiv2 couldn't be initialized")
|
|
|