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#!/usr/bin/python
# -*- coding: latin1 -*-
### Copyright (C) 2011-2012 Damon Lynch <damonlynch@gmail.com>
### This program 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.
### This program 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 this program; if not, write to the Free Software
### Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
### USA
import subprocess
import json
import datetime, time
import string
import multiprocessing
import logging
logger = multiprocessing.get_logger()
def version_info():
"""returns the version of exiftool being used"""
try:
# unfortunately subprocess.check_output does not exist on python 2.6
proc = subprocess.Popen(['exiftool', '-ver'], stdout=subprocess.PIPE)
v = proc.communicate()[0].strip()
except OSError:
v = None
return v
EXIFTOOL_VERSION = version_info()
class ExifToolMetaData:
"""
Class to use when a python based metadata parser fails to correctly load
necessary metadata. Calls exiftool as a subprocess. It is therefore slow,
but in contrast to exiv2 or kaa metadata, exiftool somtimes gives better
output.
"""
def __init__(self, filename):
self.filename = filename
self.metadata = None
self.metadata_string_format = None
self.exiftool_error = "Error encountered using exiftool with file %s"
self.exiftool_output = "Unexpected output from exiftool with file %s"
def _get(self, key, missing):
if key == "VideoStreamType" or "FileNumber":
# special case: want exiftool's string formatting
if self.metadata_string_format is None:
try:
proc = subprocess.Popen(['exiftool', '-j', self.filename], stdout=subprocess.PIPE)
s = proc.communicate()[0]
except:
logger.error(self.exiftool_error, self.filename)
return missing
try:
self.metadata_string_format = json.loads(s)
except:
logger.error(self.exiftool_output, self.filename)
return missing
try:
v = self.metadata_string_format[0][key]
except:
return missing
return v
elif self.metadata is None:
# note: exiftool's string formatting is OFF (-n switch)
try:
proc = subprocess.Popen(['exiftool', '-j', '-n', self.filename], stdout=subprocess.PIPE)
s = proc.communicate()[0]
except:
logger.error(self.exiftool_error, self.filename)
return missing
try:
self.metadata = json.loads(s)
except:
logger.error(self.exiftool_output, self.filename)
return missing
try:
v = self.metadata[0][key]
except:
return missing
return v
def date_time(self, missing=''):
"""
Returns in python datetime format the date and time the image was
recorded.
Trys to get value from key "DateTimeOriginal"
If that fails, tries "CreateDate"
Returns missing either metadata value is not present.
"""
d = self._get('DateTimeOriginal', None)
if d is None:
d = self._get('CreateDate', None)
if d is None:
d = self._get('FileModifyDate', None)
if d is not None:
try:
# returned value may or may not have a time offset
# strip it if need be
dt = d[:19]
dt = datetime.datetime.strptime(dt, "%Y:%m:%d %H:%M:%S")
except:
logger.error("Error reading date metadata with file %s", self.filename)
return missing
return dt
else:
return missing
def time_stamp(self, missing=''):
"""
Returns a float value representing the time stamp, if it exists
"""
dt = self.date_time(missing=None)
if dt:
# convert it to a time stamp (not optimal, but better than nothing!)
v = time.mktime(dt.timetuple())
else:
v = missing
return v
def file_number(self, missing=''):
v = self._get("FileNumber", None)
if v is not None:
return str(v)
else:
return missing
def width(self, missing=''):
v = self._get('ImageWidth', None)
if v is not None:
return str(v)
else:
return missing
def height(self, missing=''):
v = self._get('ImageHeight', None)
if v is not None:
return str(v)
else:
return missing
def length(self, missing=''):
"""
return the duration (length) of the video, rounded to the nearest second, in string format
"""
v = self._get("Duration", None)
if v is not None:
try:
v = float(v)
v = "%0.f" % v
except:
return missing
return v
else:
return missing
def frames_per_second(self, stream=0, missing=''):
"""
value stream is ignored (kept for compatibilty with code calling kaa)
"""
v = self._get("FrameRate", None)
if v is None:
v = self._get("VideoFrameRate", None)
if v is None:
return missing
try:
v = '%.0f' % v
except:
return missing
return v
def codec(self, stream=0, missing=''):
"""
value stream is ignored (kept for compatibilty with code calling kaa)
"""
v = self._get("VideoStreamType", None)
if v is None:
v = self._get("VideoCodec", None)
if v is not None:
return v
else:
return missing
def fourcc(self, stream=0, missing=''):
"""
value stream is ignored (kept for compatibilty with code calling kaa)
"""
return self._get("CompressorID", missing)
if __name__ == '__main__':
import sys
if (len(sys.argv) != 2):
print 'Usage: ' + sys.argv[0] + ' path/to/video/containing/metadata'
sys.exit(0)
else:
m = ExifToolMetaData(sys.argv[1])
dt = m.date_time()
print dt
print "%sx%s" % (m.width(), m.height())
print m.length()
print m.frames_per_second()
print m.codec()
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