1 #

     2 # dexif.py - simple EXIF processing for Degal

     3 # Copyright (C) 2008, Santtu Pajukanta <santtu@pajukanta.fi>

     4 #

     5 # This program is free software; you can redistribute it and/or modify

     6 # it under the terms of the GNU General Public License as published by

     7 # the Free Software Foundation; either version 2 of the License, or

     8 # (at your option) any later version.

     9 #

    10 # This program is distributed in the hope that it will be useful,

    11 # but WITHOUT ANY WARRANTY; without even the implied warranty of

    12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    13 # GNU General Public License for more details.

    14 #

    15 # You should have received a copy of the GNU General Public License

    16 # along with this program; if not, write to the

    17 # Free Software Foundation, Inc.,

    18 # 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

    19 #

    20 

    21 from subprocess import Popen, PIPE

    22 

    23 # TODO This should be user configurable

    24 EXIFTOOL="/usr/bin/exiftool"

    25 

    26 outputTags = [

    27 # TODO Create date is in a useless format, needs some strptime love

    28     ("CreateDate", "Create date"),

    29     ("Model", "Camera model"),

    30     ("Aperture", "Aperture"),

    31     ("ExposureMode", "Exposure mode"),

    32     ("ExposureCompensation", "Exposure compensation"),

    33     ("ExposureTime", "Exposure time"),

    34     ("Flash", "Flash mode"),

    35     ("ISO", "ISO"),

    36     ("ShootingMode", "Shooting mode"),

    37     ("LensType", "Lens type"),

    38     ("FocalLength", "Focal length")

    39 ]

    40 

    41 

    42 class ExifError(Exception):

    43     pass

    44 

    45 def parse_exif(filepath):

    46     """parse_exif(filepath :: String) -> [(String, String)]

    47 

    48     Parse EXIF tags from an image file and return them in a dict.

    49     """

    50 

    51     args = [EXIFTOOL, "-s", "-t", filepath]

    52     etproc = Popen(args, stdout = PIPE)

    53 

    54     output, errors = etproc.communicate()

    55     

    56     if etproc.returncode < 0:

    57         raise ExifError, "exiftool terminated by signal %d" % (-etproc.returnco)

    58     elif etproc.returncode > 0:

    59         raise ExifError, "exiftool failed with return code %d" % etproc.returncode

    60     

    61     tags = dict(line.split("\t", 1) for line in output.split("\n") if line)

    62     result = [(descr, tags[key]) for (key, descr) in outputTags if tags.has_key(key)]

    63     return result