ordigi/elodie/media/video.py

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"""
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The video module contains the :class:`Video` class, which represents video
objects (AVI, MOV, etc.).
.. moduleauthor:: Jaisen Mathai <jaisen@jmathai.com>
"""
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# load modules
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from distutils.spawn import find_executable
import tempfile
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from datetime import datetime
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import os
import re
import shutil
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import subprocess
import time
from elodie import constants
from elodie import plist_parser
from elodie.dependencies import get_exiftool
from media import Media
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class Video(Media):
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"""A video object.
:param str source: The fully qualified path to the video file.
"""
__name__ = 'Video'
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#: Valid extensions for video files.
extensions = ('avi', 'm4v', 'mov', 'mp4', '3gp')
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def __init__(self, source=None):
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super(Video, self).__init__(source)
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def get_avmetareadwrite(self):
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"""Get path to executable avmetareadwrite binary.
We wrap this since we call it in a few places and we do a fallback.
:returns: None or string
"""
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avmetareadwrite = find_executable('avmetareadwrite')
if(avmetareadwrite is None):
avmetareadwrite = '/usr/bin/avmetareadwrite'
if(not os.path.isfile(avmetareadwrite) or not os.access(avmetareadwrite, os.X_OK)): # noqa
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return None
return avmetareadwrite
def get_coordinate(self, type='latitude'):
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"""Get latitude or longitude of photo from EXIF.
:returns: time object or None for non-video files or 0 timestamp
"""
exif_data = self.get_exif()
if(exif_data is None):
return None
coords = re.findall('(GPS %s +: .+)' % type.capitalize(), exif_data)
if(coords is None or len(coords) == 0):
return None
coord_string = coords[0]
coordinate = re.findall('([0-9.]+)', coord_string)
direction = re.search('[NSEW]$', coord_string)
if(coordinate is None or direction is None):
return None
direction = direction.group(0)
decimal_degrees = float(coordinate[0]) + float(coordinate[1])/60 + float(coordinate[2])/3600 # noqa
if(direction == 'S' or direction == 'W'):
decimal_degrees = decimal_degrees * -1
return decimal_degrees
def get_date_taken(self):
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"""Get the date which the video was taken.
The date value returned is defined by the min() of mtime and ctime.
:returns: time object or None for non-video files or 0 timestamp
"""
if(not self.is_valid()):
return None
source = self.source
# We need to parse a string from EXIF into a timestamp.
# We use date.strptime -> .timetuple -> time.mktime to do the
# conversion in the local timezone
# If the time is not found in EXIF we update EXIF
seconds_since_epoch = min(os.path.getmtime(source), os.path.getctime(source)) # noqa
exif_data = self.get_exif()
for key in ['Creation Date', 'Media Create Date']:
date = re.search('%s +: +([0-9: ]+)' % key, exif_data)
if(date is not None):
date_string = date.group(1)
try:
exif_seconds_since_epoch = time.mktime(
datetime.strptime(
date_string,
'%Y:%m:%d %H:%M:%S'
).timetuple()
)
if(exif_seconds_since_epoch < seconds_since_epoch):
seconds_since_epoch = exif_seconds_since_epoch
break
except:
pass
if(seconds_since_epoch == 0):
return None
return time.gmtime(seconds_since_epoch)
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def get_duration(self):
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"""Get the duration of a video in seconds.
This uses ffmpeg/ffprobe.
:returns: str or None for a non-video file
"""
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if(not self.is_valid()):
return None
source = self.source
result = subprocess.Popen(
['ffprobe', source],
stdout=subprocess.PIPE,
stderr=subprocess.STDOUT
)
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for key in result.stdout.readlines():
if 'Duration' in key:
return re.search(
'(\d{2}:\d{2}.\d{2})',
key
).group(1).replace('.', ':')
return None
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def get_exif(self):
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"""Get exif data from video file.
Not all video files have exif and this currently relies on the CLI
exiftool program.
:returns: str or None if exiftool is not found
"""
exiftool = get_exiftool()
if(exiftool is None):
return None
source = self.source
process_output = subprocess.Popen(
['%s "%s"' % (exiftool, source)],
stdout=subprocess.PIPE,
shell=True
)
return process_output.stdout.read()
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.
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:returns: bool
"""
source = self.source
return os.path.splitext(source)[1][1:].lower() in self.extensions
def set_date_taken(self, date_taken_as_datetime):
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"""
Set the date/time a photo was taken
:param datetime date_taken_as_datetime: datetime object of when the
video was recorded.
:returns: bool
"""
if(time is None):
return False
source = self.source
result = self.__update_using_plist(time=date_taken_as_datetime)
if(result is True):
os.utime(
source,
(
int(time.time()),
time.mktime(date_taken_as_datetime.timetuple())
)
)
return result
def set_location(self, latitude, longitude):
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"""
Set latitude and longitude for a video.
:param float latitude: Latitude of the file
:param float longitude: Longitude of the file
:returns: bool
"""
if(latitude is None or longitude is None):
return False
result = self.__update_using_plist(latitude=latitude, longitude=longitude) # noqa
return result
def set_title(self, title):
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"""Set title for a video.
:param str title: Title for the file
:returns: bool
"""
if(title is None):
return False
result = self.__update_using_plist(title=title)
return result
def __update_using_plist(self, **kwargs):
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"""Updates video metadata using avmetareadwrite.
This method does a lot more than it should. The general steps are...
1. Check if avmetareadwrite is installed
2. Export a plist file to a temporary location from the source file
3. Regex replace values in the plist file
4. Update the source file using the updated plist and save it to a
temporary location
5. Validate that the metadata in the updated temorary movie is valid
6. Copystat permission and time bits from the source file to the
temporary movie
7. Move the temporary file to overwrite the source file
:param float latitude: Latitude of the file
:param float longitude: Longitude of the file
:returns: bool
"""
if(
'latitude' not in kwargs and
'longitude' not in kwargs and
'time' not in kwargs and
'title' not in kwargs
):
if(constants.debug is True):
print 'No lat/lon passed into __create_plist'
return False
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avmetareadwrite = self.get_avmetareadwrite()
if(avmetareadwrite is None):
if(constants.debug is True):
print 'Could not find avmetareadwrite'
return False
source = self.source
# First we need to write the plist for an existing file
# to a temporary location
with tempfile.NamedTemporaryFile() as plist_temp:
# We need to write the plist file in a child process
# but also block for it to be complete.
# http://stackoverflow.com/a/5631819/1318758
avmetareadwrite_generate_plist_command = '%s -p "%s" "%s"' % (
avmetareadwrite,
plist_temp.name,
source
)
write_process = subprocess.Popen(
[avmetareadwrite_generate_plist_command],
stdout=subprocess.PIPE,
shell=True
)
write_process.communicate()
if(write_process.returncode != 0):
if(constants.debug is True):
print 'Failed to generate plist file'
return False
plist = plist_parser.Plist(plist_temp.name)
# Depending on the kwargs that were passed in we regex
# the plist_text before we write it back.
plist_should_be_written = False
if('latitude' in kwargs and 'longitude' in kwargs):
latitude = str(abs(kwargs['latitude'])).lstrip('0')
longitude = kwargs['longitude']
# Add a literal '+' to the lat/lon if it is positive.
# Do this first because we convert longitude to a string below.
lat_sign = '+' if latitude > 0 else '-'
# We need to zeropad the longitude.
# No clue why - ask Apple.
# We set the sign to + or - and then we take the absolute value
# and fill it.
lon_sign = '+' if longitude > 0 else '-'
longitude_str = '{:9.5f}'.format(abs(longitude)).replace(' ', '0') # noqa
lat_lon_str = '%s%s%s%s' % (
lat_sign,
latitude,
lon_sign,
longitude_str
)
plist.update_key('common/location', lat_lon_str)
plist_should_be_written = True
if('time' in kwargs):
# The time formats can be YYYY-mm-dd or YYYY-mm-dd hh:ii:ss
time_parts = str(kwargs['time']).split(' ')
ymd, hms = [None, None]
if(len(time_parts) >= 1):
ymd = [int(x) for x in time_parts[0].split('-')]
if(len(time_parts) == 2):
hms = [int(x) for x in time_parts[1].split(':')]
if(hms is not None):
d = datetime(ymd[0], ymd[1], ymd[2], hms[0], hms[1], hms[2]) # noqa
else:
d = datetime(ymd[0], ymd[1], ymd[2], 12, 00, 00)
offset = time.strftime("%z", time.gmtime(time.time()))
time_string = d.strftime('%Y-%m-%dT%H:%M:%S{}'.format(offset)) # noqa
plist.update_key('common/creationDate', time_string)
plist_should_be_written = True
if('title' in kwargs):
if(len(kwargs['title']) > 0):
plist.update_key('common/title', kwargs['title'])
plist_should_be_written = True
if(plist_should_be_written is True):
plist_final = plist_temp.name
plist.write_file(plist_final)
else:
if(constants.debug is True):
print 'Nothing to update, plist unchanged'
return False
# We create a temporary file to save the modified file to.
# If the modification is successful we will update the
# existing file.
# We can't call self.get_metadata else we will run into
# infinite loops
# metadata = self.get_metadata()
temp_movie = None
with tempfile.NamedTemporaryFile() as temp_file:
temp_movie = '%s.%s' % (temp_file.name, self.get_extension())
# We need to block until the child process completes.
# http://stackoverflow.com/a/5631819/1318758
avmetareadwrite_command = '%s -a %s "%s" "%s"' % (
avmetareadwrite,
plist_final,
source,
temp_movie
)
update_process = subprocess.Popen(
[avmetareadwrite_command],
stdout=subprocess.PIPE,
shell=True
)
update_process.communicate()
if(update_process.returncode != 0):
if(constants.debug is True):
print '%s did not complete successfully' % avmetareadwrite_command # noqa
return False
# Before we do anything destructive we confirm that the
# file is in tact.
check_media = Media.get_class_by_file(temp_movie, [self.__class__])
check_metadata = check_media.get_metadata()
if(
(
'latitude' in kwargs and
'longitude' in kwargs and
check_metadata['latitude'] is None and
check_metadata['longitude'] is None
) or (
'time' in kwargs and
check_metadata['date_taken'] is None
)
):
if(constants.debug is True):
print 'Something went wrong updating video metadata'
return False
# Copy file information from original source to temporary file
# before copying back over
shutil.copystat(source, temp_movie)
stat = os.stat(source)
shutil.move(temp_movie, source)
os.utime(source, (stat.st_atime, stat.st_mtime))
return True
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class Transcode(object):
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"""Constructor takes a video object as its parameter.
:param Video video: Video object.
"""
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def __init__(self, video=None):
self.video = video