122 lines
3.7 KiB
Python
122 lines
3.7 KiB
Python
"""
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The photo module contains the :class:`Photo` class, which is used to track
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image objects (JPG, DNG, etc.).
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.. moduleauthor:: Jaisen Mathai <jaisen@jmathai.com>
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"""
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import imghdr
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import os
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import re
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import subprocess
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import time
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from datetime import datetime
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from re import compile
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from elodie import constants
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from media import Media
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class Photo(Media):
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"""A photo object.
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:param str source: The fully qualified path to the photo file
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"""
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__name__ = 'Photo'
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#: Valid extensions for photo files.
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extensions = ('arw', 'dng', 'gif', 'jpeg', 'jpg', 'nef', 'rw2')
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def __init__(self, source=None):
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super(Photo, self).__init__(source)
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# We only want to parse EXIF once so we store it here
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self.exif = None
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def get_duration(self):
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"""Get the duration of a photo in seconds. Uses ffmpeg/ffprobe.
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:returns: str or None for a non-photo file
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"""
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if(not self.is_valid()):
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return None
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source = self.source
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result = subprocess.Popen(
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['ffprobe', source],
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stdout=subprocess.PIPE,
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stderr=subprocess.STDOUT
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)
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for key in result.stdout.readlines():
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if 'Duration' in key:
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return re.search(
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'(\d{2}:\d{2}.\d{2})',
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key
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).group(1).replace('.', ':')
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return None
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def get_date_taken(self):
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"""Get the date which the photo was taken.
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The date value returned is defined by the min() of mtime and ctime.
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:returns: time object or None for non-photo files or 0 timestamp
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"""
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if(not self.is_valid()):
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return None
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source = self.source
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seconds_since_epoch = min(os.path.getmtime(source), os.path.getctime(source)) # noqa
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exif = self.get_exiftool_attributes()
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if not exif:
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return seconds_since_epoch
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# We need to parse a string from EXIF into a timestamp.
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# EXIF DateTimeOriginal and EXIF DateTime are both stored
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# in %Y:%m:%d %H:%M:%S format
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# we split on a space and then r':|-' -> convert to int -> .timetuple()
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# the conversion in the local timezone
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# EXIF DateTime is already stored as a timestamp
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# Sourced from https://github.com/photo/frontend/blob/master/src/libraries/models/Photo.php#L500 # noqa
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for key in self.exif_map['date_taken']:
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try:
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if(key in exif):
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if(re.match('\d{4}(-|:)\d{2}(-|:)\d{2}', exif[key]) is not None): # noqa
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dt, tm = exif[key].split(' ')
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dt_list = compile(r'-|:').split(dt)
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dt_list = dt_list + compile(r'-|:').split(tm)
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dt_list = map(int, dt_list)
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time_tuple = datetime(*dt_list).timetuple()
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seconds_since_epoch = time.mktime(time_tuple)
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break
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except BaseException as e:
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if(constants.debug is True):
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print e
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pass
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if(seconds_since_epoch == 0):
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return None
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return time.gmtime(seconds_since_epoch)
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def is_valid(self):
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"""Check the file extension against valid file extensions.
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The list of valid file extensions come from self.extensions. This
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also checks whether the file is an image.
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:returns: bool
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"""
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source = self.source
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# gh-4 This checks if the source file is an image.
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# It doesn't validate against the list of supported types.
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if(imghdr.what(source) is None):
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return False
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return os.path.splitext(source)[1][1:].lower() in self.extensions
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