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# Copyright (C) 2016 Damon Lynch <damonlynch@gmail.com>
# This file is part of Rapid Photo Downloader.
#
# Rapid Photo Downloader 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 3 of the License, or
# (at your option) any later version.
#
# Rapid Photo Downloader 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 Rapid Photo Downloader. If not,
# see <http://www.gnu.org/licenses/>.
"""
Collects attributes about varieties of video formats, including how much of the file
has to be read in order to extract metadata information or generate a thumbnail.
"""
__author__ = 'Damon Lynch'
__copyright__ = "Copyright 2016, Damon Lynch"
from tempfile import NamedTemporaryFile, TemporaryDirectory
import os
import datetime
from typing import Dict, Union
from raphodo.photoattributes import vmtouch_output
import raphodo.exiftool as exiftool
from raphodo.metadatavideo import MetaData
from raphodo.utilities import format_size_for_user, datetime_roughly_equal
from raphodo.thumbnailextractor import get_video_frame
class VideoAttributes:
def __init__(self, full_file_name: str, ext: str, et_process: exiftool.ExifTool) -> None:
self.datetime = None # type: datetime.datetime
self.file_name = full_file_name
self.ext = ext
self.et_process = et_process
self.minimum_read_size_in_bytes_datetime = None # type: int
self.minimum_read_size_in_bytes_thumbnail = None # type: int
self.minimum_metadata_read_size_in_bytes_all = None # type: int
self.thumbnail_offset = 0.0
self.all_metadata_values = dict() # type: Dict[str, Union[int, str, float, datetime.datetime]]
stat = os.stat(full_file_name)
self.fs_datetime = datetime.datetime.fromtimestamp(stat.st_mtime)
self.file_size = stat.st_size
self.assign_video_attributes(et_process)
# Before doing further processing, understand what has already
# been cached after simply reading the datetime metadata
self.bytes_cached, self.total, self.in_memory = vmtouch_output(full_file_name)
self.thumbnail = get_video_frame(full_file_name, self.thumbnail_offset)
if self.datetime is not None:
self.minimum_extract_for_tag(self.datetime_extract)
if self.thumbnail:
self.minimum_extract_for_thumbnail()
self.minimum_extract_for_all_tags()
def assign_video_attributes(self, et_process: exiftool.ExifTool) -> None:
m = MetaData(self.file_name, et_process)
self.datetime = m.date_time(missing=None)
def datetime_extract(self, metadata: MetaData, size_in_bytes):
if metadata.date_time() == self.datetime:
self.minimum_read_size_in_bytes_datetime = min(size_in_bytes, self.file_size)
return True
return False
def minimum_extract_for_thumbnail(self):
name = os.path.split(self.file_name)[1]
with TemporaryDirectory(dir='/tmp') as tmpdirname:
with open(self.file_name, 'rb') as video:
tempname = os.path.join(tmpdirname, name)
for size_in_bytes in thumbnail_scan_range(self.file_size):
video.seek(0)
video_extract = video.read(size_in_bytes)
with open(tempname, 'wb') as f:
f.write(video_extract)
try:
if get_video_frame(tempname, self.thumbnail_offset) == self.thumbnail:
self.minimum_read_size_in_bytes_thumbnail = min(size_in_bytes,
self.file_size)
break
except AssertionError:
pass
def minimum_extract_for_tag(self, check_extract):
with open(self.file_name, 'rb') as video:
for size_in_bytes in video_metadata_scan_range(self.file_size):
video.seek(0)
video_extract = video.read(size_in_bytes)
with NamedTemporaryFile('w+b', delete=False) as f:
f.write(video_extract)
name = f.name
metadata = MetaData(name, self.et_process)
if check_extract(metadata, size_in_bytes):
os.remove(name)
break
os.remove(name)
def minimum_extract_for_all_tags(self):
funcs = 'date_time timestamp file_number width height length frames_per_second codec ' \
'fourcc rotation'.split()
metadata = MetaData(self.file_name, self.et_process)
for f in funcs:
v = getattr(metadata, f)()
if v:
self.all_metadata_values[f] = v
found = set()
with open(self.file_name, 'rb') as video:
for size_in_bytes in video_metadata_scan_range(self.file_size):
video.seek(0)
video_extract = video.read(size_in_bytes)
with NamedTemporaryFile('w+b', delete=False) as f:
f.write(video_extract)
name = f.name
metadata_extract = MetaData(name, self.et_process)
for tag in self.all_metadata_values:
if (tag not in found and
getattr(metadata_extract, tag)() == self.all_metadata_values[tag]):
found.add(tag)
if len(found) == len(self.all_metadata_values):
self.minimum_metadata_read_size_in_bytes_all = size_in_bytes
os.remove(name)
return
os.remove(name)
def __repr__(self):
if self.file_name:
s = os.path.split(self.file_name)[1]
else:
s = self.ext
if self.datetime:
s += ' {}'.format(self.datetime)
if self.minimum_read_size_in_bytes_datetime:
s += ' {} (datetime)'.format(self.minimum_read_size_in_bytes_datetime)
if self.minimum_read_size_in_bytes_thumbnail:
s += ' {} (thumb)'.format(self.minimum_read_size_in_bytes_thumbnail)
if self.minimum_metadata_read_size_in_bytes_all:
s += ' {} (variety)'.format(self.minimum_metadata_read_size_in_bytes_all)
return s
def __str__(self):
if self.file_name is not None:
s = '{}\n'.format(os.path.split(self.file_name)[1])
else:
s = self.ext
if self.datetime: # type: datetime.datetime
s += 'Datetime in metadata: {}\n'.format(self.datetime.strftime('%c'))
if not datetime_roughly_equal(self.datetime, self.fs_datetime):
s += 'Differs from datetime on file system: {}\n'.format(
self.fs_datetime.strftime('%c'))
else:
s += 'Datetime on file system: {}\n'.format(self.fs_datetime.strftime('%c'))
s += 'Disk cache after metadata read:\n[{}]\n'.format(self.in_memory)
if self.minimum_read_size_in_bytes_datetime is not None:
s += 'Minimum read size to extract datetime: {} of {}\n'.format(
format_size_for_user(self.minimum_read_size_in_bytes_datetime),
format_size_for_user(self.file_size))
if self.minimum_read_size_in_bytes_thumbnail:
s += 'Minimum read size to extract thumbnail: {} of {}\n'.format(
format_size_for_user(self.minimum_read_size_in_bytes_thumbnail),
format_size_for_user(self.file_size))
if self.minimum_metadata_read_size_in_bytes_all is not None:
s += 'Minimum read size to extract variety of tags: {}\n'.format(
format_size_for_user(self.minimum_metadata_read_size_in_bytes_all))
else:
s += 'Could not extract variety of tags with minimal read\n'
return s
def video_metadata_scan_range(size: int) -> iter:
stop = 20
for iterations, step in ((108, 1), (97, 4), (16, 32), (16, 256), (16, 512), (8, 1024),
(8, 2048 * 4), (32, 2048 * 16), (128, 2048 * 32)):
start = stop
stop = start + step * iterations
for b in range(start, stop, step):
yield b
yield size
def thumbnail_scan_range(size: int) -> iter:
stop = 100 * 1024
for iterations, step in ((10, 100 * 1024), (64, 1024 * 1024),):
start = stop
stop = start + step * iterations
for b in range(start, stop, step):
yield b
yield size
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