/usr/lib/python3/dist-packages/raphodo/videoattributes.py is in rapid-photo-downloader 0.9.9-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 | # 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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