import json
import logging
import re
from decimal import Decimal
from logging import NullHandler, getLogger
from subprocess import check_output
from knowit.core import Property
from knowit.properties import (
AudioCodec,
Basic,
Duration,
Language,
Quantity,
VideoCodec,
VideoDimensions,
YesNo,
)
from knowit.provider import (
MalformedFileError,
Provider,
)
from knowit.rules import (
AudioChannelsRule,
ClosedCaptionRule,
HearingImpairedRule,
LanguageRule,
ResolutionRule,
)
from knowit.serializer import get_json_encoder
from knowit.units import units
from knowit.utils import define_candidate, detect_os
logger = getLogger(__name__)
logger.addHandler(NullHandler())
WARN_MSG = r'''
=========================================================================================
mkvmerge not found on your system or could not be loaded.
Visit https://mkvtoolnix.download to download it.
If you still have problems, please check if the downloaded version matches your system.
To load mkvmerge from a specific location, please define the location as follow:
knowit --mkvmerge /usr/local/mkvmerge/bin <video_path>
knowit --mkvmerge /usr/local/mkvmerge/bin/ffprobe <video_path>
knowit --mkvmerge "C:\Program Files\mkvmerge" <video_path>
knowit --mkvmerge C:\Software\mkvmerge.exe <video_path>
=========================================================================================
'''
class MkvMergeExecutor:
"""Executor that knows how to execute mkvmerge."""
version_re = re.compile(r'\bv(?P<version>[^\b\s]+)')
locations = {
'unix': ('/usr/local/mkvmerge/lib', '/usr/local/mkvmerge/bin', '__PATH__'),
'windows': ('__PATH__', ),
'macos': ('__PATH__', ),
}
def __init__(self, location, version):
"""Initialize the object."""
self.location = location
self.version = version
def extract_info(self, filename):
"""Extract media info."""
json_dump = self._execute(filename)
return json.loads(json_dump)
def _execute(self, filename):
raise NotImplementedError
@classmethod
def _get_version(cls, output):
match = cls.version_re.search(output)
if match:
version = match.groupdict()['version']
return version
@classmethod
def get_executor_instance(cls, suggested_path=None):
"""Return executor instance."""
os_family = detect_os()
logger.debug('Detected os: %s', os_family)
for exec_cls in (MkvMergeCliExecutor, ):
executor = exec_cls.create(os_family, suggested_path)
if executor:
return executor
class MkvMergeCliExecutor(MkvMergeExecutor):
"""Executor that uses mkvmerge cli."""
names = {
'unix': ('mkvmerge', ),
'windows': ('mkvmerge.exe', ),
'macos': ('mkvmerge', ),
}
def _execute(self, filename):
return check_output([self.location, '-i', '-F', 'json', filename]).decode()
@classmethod
def create(cls, os_family=None, suggested_path=None):
"""Create the executor instance."""
for candidate in define_candidate(cls.locations, cls.names, os_family, suggested_path):
try:
output = check_output([candidate, '--version']).decode()
version = cls._get_version(output)
if version:
logger.debug('MkvMerge cli detected: %s v%s', candidate, version)
return MkvMergeCliExecutor(candidate, version.split('.'))
except OSError:
pass
class MkvMergeProvider(Provider):
"""MkvMerge Provider."""
def __init__(self, config, suggested_path=None, *args, **kwargs):
"""Init method."""
super().__init__(config, {
'general': {
'title': Property('title', description='media title'),
'duration': Duration('duration', resolution=Decimal('0.000001'), description='media duration'),
},
'video': {
'id': Basic('number', data_type=int, description='video track number'),
'name': Property('name', description='video track name'),
'language': Language('language_ietf', 'language', description='video language'),
'width': VideoDimensions('display_dimensions', dimension='width'),
'height': VideoDimensions('display_dimensions', dimension='height'),
'scan_type': YesNo('interlaced', yes='Interlaced', no='Progressive', default='Progressive',
config=config, config_key='ScanType',
description='video scan type'),
'resolution': None, # populated with ResolutionRule
# 'bit_depth', Property('bit_depth', Integer('video bit depth')),
'codec': VideoCodec(config, 'codec_id', description='video codec'),
'forced': YesNo('forced_track', hide_value=False, description='video track forced'),
'default': YesNo('default_track', hide_value=False, description='video track default'),
'enabled': YesNo('enabled_track', hide_value=True, description='video track enabled'),
},
'audio': {
'id': Basic('number', data_type=int, description='audio track number'),
'name': Property('name', description='audio track name'),
'language': Language('language_ietf', 'language', description='audio language'),
'codec': AudioCodec(config, 'codec_id', description='audio codec'),
'channels_count': Basic('audio_channels', data_type=int, description='audio channels count'),
'channels': None, # populated with AudioChannelsRule
'sampling_rate': Quantity('audio_sampling_frequency', unit=units.Hz, description='audio sampling rate'),
'forced': YesNo('forced_track', hide_value=False, description='audio track forced'),
'default': YesNo('default_track', hide_value=False, description='audio track default'),
'enabled': YesNo('enabled_track', hide_value=True, description='audio track enabled'),
},
'subtitle': {
'id': Basic('number', data_type=int, description='subtitle track number'),
'name': Property('name', description='subtitle track name'),
'language': Language('language_ietf', 'language', description='subtitle language'),
'hearing_impaired': None, # populated with HearingImpairedRule
'closed_caption': None, # populated with ClosedCaptionRule
'forced': YesNo('forced_track', hide_value=False, description='subtitle track forced'),
'default': YesNo('default_track', hide_value=False, description='subtitle track default'),
'enabled': YesNo('enabled_track', hide_value=True, description='subtitle track enabled'),
},
}, {
'video': {
'language': LanguageRule('video language', override=True),
'resolution': ResolutionRule('video resolution'),
},
'audio': {
'language': LanguageRule('audio language', override=True),
'channels': AudioChannelsRule('audio channels'),
},
'subtitle': {
'language': LanguageRule('subtitle language', override=True),
'hearing_impaired': HearingImpairedRule('subtitle hearing impaired'),
'closed_caption': ClosedCaptionRule('closed caption'),
}
})
self.executor = MkvMergeExecutor.get_executor_instance(suggested_path)
def accepts(self, video_path):
"""Accept Matroska videos when mkvmerge is available."""
if self.executor is None:
logger.warning(WARN_MSG)
self.executor = False
return self.executor and video_path.lower().endswith(('.mkv', '.mka', '.mks'))
@classmethod
def extract_info(cls, video_path):
"""Extract info from the video."""
return json.loads(check_output(['mkvmerge', '-i', '-F', video_path]).decode())
def describe(self, video_path, context):
"""Return video metadata."""
data = self.executor.extract_info(video_path)
def debug_data():
"""Debug data."""
return json.dumps(data, cls=get_json_encoder(context), indent=4, ensure_ascii=False)
context['debug_data'] = debug_data
if logger.isEnabledFor(logging.DEBUG):
logger.debug('Video %r scanned using mkvmerge %r has raw data:\n%s',
video_path, self.executor.location, debug_data())
def merge_properties(target: dict):
"""Merge properties sub properties into the target container."""
return {**{k: v for k, v in target.items() if k != 'properties'}, **target.get('properties', {})}
general_track = merge_properties(data.get('container', {}))
video_tracks = []
audio_tracks = []
subtitle_tracks = []
for track in data.get('tracks'):
track_type = track.get('type')
merged = merge_properties(track)
if track_type == 'video':
video_tracks.append(merged)
elif track_type == 'audio':
audio_tracks.append(merged)
elif track_type == 'subtitles':
subtitle_tracks.append(merged)
result = self._describe_tracks(video_path, general_track, video_tracks, audio_tracks, subtitle_tracks, context)
if not result:
raise MalformedFileError
result['provider'] = {
'name': 'mkvmerge',
'version': self.version
}
return result
@property
def version(self):
"""Return mkvmerge version information."""
if not self.executor:
return {}
version = '.'.join(map(str, self.executor.version))
return {self.executor.location: f'v{version}'}