terom@34: #
terom@34: # dexif.py - simple EXIF processing for Degal
terom@34: # Copyright (C) 2008, Santtu Pajukanta <santtu@pajukanta.fi>
terom@34: #
terom@34: # This program is free software; you can redistribute it and/or modify
terom@34: # it under the terms of the GNU General Public License as published by
terom@34: # the Free Software Foundation; either version 2 of the License, or
terom@34: # (at your option) any later version.
terom@34: #
terom@34: # This program is distributed in the hope that it will be useful,
terom@34: # but WITHOUT ANY WARRANTY; without even the implied warranty of
terom@34: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
terom@34: # GNU General Public License for more details.
terom@34: #
terom@34: # You should have received a copy of the GNU General Public License
terom@34: # along with this program; if not, write to the
terom@34: # Free Software Foundation, Inc.,
terom@34: # 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
terom@34: #
terom@34: 
terom@34: from subprocess import Popen, PIPE
terom@34: 
terom@34: # TODO This should be user configurable
terom@34: EXIFTOOL="/usr/bin/exiftool"
terom@34: 
terom@34: outputTags = [
terom@34: # TODO Create date is in a useless format, needs some strptime love
terom@34:     ("CreateDate", "Create date"),
terom@34:     ("Model", "Camera model"),
terom@34:     ("Aperture", "Aperture"),
terom@34:     ("ExposureMode", "Exposure mode"),
terom@34:     ("ExposureCompensation", "Exposure compensation"),
terom@34:     ("ExposureTime", "Exposure time"),
terom@34:     ("Flash", "Flash mode"),
terom@34:     ("ISO", "ISO"),
terom@34:     ("ShootingMode", "Shooting mode"),
terom@34:     ("LensType", "Lens type"),
terom@34:     ("FocalLength", "Focal length")
terom@34: ]
terom@34: 
terom@34: 
terom@34: class ExifError(Exception):
terom@34:     pass
terom@34: 
terom@34: def parse_exif(filepath):
terom@34:     """parse_exif(filepath :: String) -> [(String, String)]
terom@34: 
terom@34:     Parse EXIF tags from an image file and return them in a dict.
terom@34:     """
terom@34: 
terom@34:     args = [EXIFTOOL, "-s", "-t", filepath]
terom@34:     etproc = Popen(args, stdout = PIPE)
terom@34: 
terom@34:     output, errors = etproc.communicate()
terom@34:     
terom@34:     if etproc.returncode < 0:
terom@34:         raise ExifError, "exiftool terminated by signal %d" % (-etproc.returnco)
terom@34:     elif etproc.returncode > 0:
terom@34:         raise ExifError, "exiftool failed with return code %d" % etproc.returncode
terom@34:     
terom@34:     tags = dict(line.split("\t", 1) for line in output.split("\n") if line)
terom@34:     result = [(descr, tags[key]) for (key, descr) in outputTags if tags.has_key(key)]
terom@34:     return result