bazarr/libs/enzyme/mkv.py

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# -*- coding: utf-8 -*-
from .exceptions import ParserError, MalformedMKVError
from .parsers import ebml
from datetime import timedelta
import logging
__all__ = ['VIDEO_TRACK', 'AUDIO_TRACK', 'SUBTITLE_TRACK', 'MKV', 'Info', 'Track', 'VideoTrack',
'AudioTrack', 'SubtitleTrack', 'Tag', 'SimpleTag', 'Chapter']
logger = logging.getLogger(__name__)
# Track types
VIDEO_TRACK, AUDIO_TRACK, SUBTITLE_TRACK = 0x01, 0x02, 0x11
class MKV(object):
"""Matroska Video file
:param stream: seekable file-like object
"""
def __init__(self, stream, recurse_seek_head=False):
# default attributes
self.info = None
self.video_tracks = []
self.audio_tracks = []
self.subtitle_tracks = []
self.chapters = []
self.tags = []
# keep track of the elements parsed
self.recurse_seek_head = recurse_seek_head
self._parsed_positions = set()
try:
# get the Segment element
logger.info('Reading Segment element')
specs = ebml.get_matroska_specs()
segments = ebml.parse(stream, specs, ignore_element_names=['EBML'], max_level=0)
if not segments:
raise MalformedMKVError('No Segment found')
if len(segments) > 1:
logger.warning('%d segments found, using the first one', len(segments))
segment = segments[0]
# get and recursively parse the SeekHead element
logger.info('Reading SeekHead element')
stream.seek(segment.position)
seek_head = ebml.parse_element(stream, specs)
if seek_head.name != 'SeekHead':
raise MalformedMKVError('No SeekHead found')
seek_head.load(stream, specs, ignore_element_names=['Void', 'CRC-32'])
self._parse_seekhead(seek_head, segment, stream, specs)
except ParserError as e:
raise MalformedMKVError('Parsing error: %s' % e)
def _parse_seekhead(self, seek_head, segment, stream, specs):
for seek in seek_head:
element_id = ebml.read_element_id(seek['SeekID'].data)
element_name = specs[element_id][1]
element_position = seek['SeekPosition'].data + segment.position
if element_position in self._parsed_positions:
logger.warning('Skipping already parsed %s element at position %d', element_name, element_position)
continue
if element_name == 'Info':
logger.info('Processing element %s from SeekHead at position %d', element_name, element_position)
stream.seek(element_position)
self.info = Info.fromelement(ebml.parse_element(stream, specs, True, ignore_element_names=['Void', 'CRC-32']))
elif element_name == 'Tracks':
logger.info('Processing element %s from SeekHead at position %d', element_name, element_position)
stream.seek(element_position)
tracks = ebml.parse_element(stream, specs, True, ignore_element_names=['Void', 'CRC-32'])
self.video_tracks.extend([VideoTrack.fromelement(t) for t in tracks if t['TrackType'].data == VIDEO_TRACK])
self.audio_tracks.extend([AudioTrack.fromelement(t) for t in tracks if t['TrackType'].data == AUDIO_TRACK])
self.subtitle_tracks.extend([SubtitleTrack.fromelement(t) for t in tracks if t['TrackType'].data == SUBTITLE_TRACK])
elif element_name == 'Chapters':
logger.info('Processing element %s from SeekHead at position %d', element_name, element_position)
stream.seek(element_position)
self.chapters.extend([Chapter.fromelement(c) for c in ebml.parse_element(stream, specs, True, ignore_element_names=['Void', 'CRC-32'])[0] if c.name == 'ChapterAtom'])
elif element_name == 'Tags':
logger.info('Processing element %s from SeekHead at position %d', element_name, element_position)
stream.seek(element_position)
self.tags.extend([Tag.fromelement(t) for t in ebml.parse_element(stream, specs, True, ignore_element_names=['Void', 'CRC-32'])])
elif element_name == 'SeekHead' and self.recurse_seek_head:
logger.info('Processing element %s from SeekHead at position %d', element_name, element_position)
stream.seek(element_position)
self._parse_seekhead(ebml.parse_element(stream, specs, True, ignore_element_names=['Void', 'CRC-32']), segment, stream, specs)
else:
logger.debug('Element %s ignored', element_name)
self._parsed_positions.add(element_position)
def to_dict(self):
return {'info': self.info.__dict__, 'video_tracks': [t.__dict__ for t in self.video_tracks],
'audio_tracks': [t.__dict__ for t in self.audio_tracks], 'subtitle_tracks': [t.__dict__ for t in self.subtitle_tracks],
'chapters': [c.__dict__ for c in self.chapters], 'tags': [t.__dict__ for t in self.tags]}
def __repr__(self):
return '<%s [%r, %r, %r, %r]>' % (self.__class__.__name__, self.info, self.video_tracks, self.audio_tracks, self.subtitle_tracks)
class Info(object):
"""Object for the Info EBML element"""
def __init__(self, title=None, duration=None, date_utc=None, timecode_scale=None, muxing_app=None, writing_app=None):
self.title = title
self.duration = timedelta(microseconds=duration * (timecode_scale or 1000000) // 1000) if duration else None
self.date_utc = date_utc
self.muxing_app = muxing_app
self.writing_app = writing_app
@classmethod
def fromelement(cls, element):
"""Load the :class:`Info` from an :class:`~enzyme.parsers.ebml.Element`
:param element: the Info element
:type element: :class:`~enzyme.parsers.ebml.Element`
"""
title = element.get('Title')
duration = element.get('Duration')
date_utc = element.get('DateUTC')
timecode_scale = element.get('TimecodeScale')
muxing_app = element.get('MuxingApp')
writing_app = element.get('WritingApp')
return cls(title, duration, date_utc, timecode_scale, muxing_app, writing_app)
def __repr__(self):
return '<%s [title=%r, duration=%s, date=%s]>' % (self.__class__.__name__, self.title, self.duration, self.date_utc)
def __str__(self):
return repr(self.__dict__)
class Track(object):
"""Base object for the Tracks EBML element"""
def __init__(self, type=None, number=None, name=None, language=None, enabled=None, default=None, forced=None, lacing=None, # @ReservedAssignment
codec_id=None, codec_name=None):
self.type = type
self.number = number
self.name = name
self.language = language
self.enabled = enabled
self.default = default
self.forced = forced
self.lacing = lacing
self.codec_id = codec_id
self.codec_name = codec_name
@classmethod
def fromelement(cls, element):
"""Load the :class:`Track` from an :class:`~enzyme.parsers.ebml.Element`
:param element: the Track element
:type element: :class:`~enzyme.parsers.ebml.Element`
"""
type = element.get('TrackType') # @ReservedAssignment
number = element.get('TrackNumber', 0)
name = element.get('Name')
language = element.get('Language', 'eng')
enabled = bool(element.get('FlagEnabled', 1))
default = bool(element.get('FlagDefault', 1))
forced = bool(element.get('FlagForced', 0))
lacing = bool(element.get('FlagLacing', 1))
codec_id = element.get('CodecID')
codec_name = element.get('CodecName')
return cls(type=type, number=number, name=name, language=language, enabled=enabled, default=default,
forced=forced, lacing=lacing, codec_id=codec_id, codec_name=codec_name)
def __repr__(self):
return '<%s [%d, name=%r, language=%s]>' % (self.__class__.__name__, self.number, self.name, self.language)
def __str__(self):
return str(self.__dict__)
class VideoTrack(Track):
"""Object for the Tracks EBML element with :data:`VIDEO_TRACK` TrackType"""
def __init__(self, width=0, height=0, interlaced=False, stereo_mode=None, crop=None,
display_width=None, display_height=None, display_unit=None, aspect_ratio_type=None, **kwargs):
super(VideoTrack, self).__init__(**kwargs)
self.width = width
self.height = height
self.interlaced = interlaced
self.stereo_mode = stereo_mode
self.crop = crop
self.display_width = display_width
self.display_height = display_height
self.display_unit = display_unit
self.aspect_ratio_type = aspect_ratio_type
@classmethod
def fromelement(cls, element):
"""Load the :class:`VideoTrack` from an :class:`~enzyme.parsers.ebml.Element`
:param element: the Track element with :data:`VIDEO_TRACK` TrackType
:type element: :class:`~enzyme.parsers.ebml.Element`
"""
videotrack = super(VideoTrack, cls).fromelement(element)
videotrack.width = element['Video'].get('PixelWidth', 0)
videotrack.height = element['Video'].get('PixelHeight', 0)
videotrack.interlaced = bool(element['Video'].get('FlagInterlaced', False))
videotrack.stereo_mode = element['Video'].get('StereoMode', 0)
videotrack.crop = {}
if 'PixelCropTop' in element['Video']:
videotrack.crop['top'] = element['Video']['PixelCropTop']
if 'PixelCropBottom' in element['Video']:
videotrack.crop['bottom'] = element['Video']['PixelCropBottom']
if 'PixelCropLeft' in element['Video']:
videotrack.crop['left'] = element['Video']['PixelCropLeft']
if 'PixelCropRight' in element['Video']:
videotrack.crop['right'] = element['Video']['PixelCropRight']
videotrack.display_unit = element['Video'].get('DisplayUnit')
videotrack.display_width = element['Video'].get('DisplayWidth')
videotrack.display_height = element['Video'].get('DisplayHeight')
videotrack.aspect_ratio_type = element['Video'].get('AspectRatioType', 0)
return videotrack
def __repr__(self):
return '<%s [%d, %dx%d, %s, name=%r, language=%s]>' % (self.__class__.__name__, self.number, self.width, self.height,
self.codec_id, self.name, self.language)
def __str__(self):
return str(self.__dict__)
class AudioTrack(Track):
"""Object for the Tracks EBML element with :data:`AUDIO_TRACK` TrackType"""
def __init__(self, sampling_frequency=None, channels=None, output_sampling_frequency=None, bit_depth=None, **kwargs):
super(AudioTrack, self).__init__(**kwargs)
self.sampling_frequency = sampling_frequency
self.channels = channels
self.output_sampling_frequency = output_sampling_frequency
self.bit_depth = bit_depth
@classmethod
def fromelement(cls, element):
"""Load the :class:`AudioTrack` from an :class:`~enzyme.parsers.ebml.Element`
:param element: the Track element with :data:`AUDIO_TRACK` TrackType
:type element: :class:`~enzyme.parsers.ebml.Element`
"""
audiotrack = super(AudioTrack, cls).fromelement(element)
audiotrack.sampling_frequency = element['Audio'].get('SamplingFrequency', 8000.0)
audiotrack.channels = element['Audio'].get('Channels', 1)
audiotrack.output_sampling_frequency = element['Audio'].get('OutputSamplingFrequency', audiotrack.sampling_frequency)
audiotrack.bit_depth = element['Audio'].get('BitDepth')
return audiotrack
def __repr__(self):
return '<%s [%d, %d channel(s), %.0fHz, %s, name=%r, language=%s]>' % (self.__class__.__name__, self.number, self.channels,
self.sampling_frequency, self.codec_id, self.name, self.language)
class SubtitleTrack(Track):
"""Object for the Tracks EBML element with :data:`SUBTITLE_TRACK` TrackType"""
pass
class Tag(object):
"""Object for the Tag EBML element"""
def __init__(self, targets=None, simpletags=None):
self.targets = targets if targets is not None else []
self.simpletags = simpletags if simpletags is not None else []
@classmethod
def fromelement(cls, element):
"""Load the :class:`Tag` from an :class:`~enzyme.parsers.ebml.Element`
:param element: the Tag element
:type element: :class:`~enzyme.parsers.ebml.Element`
"""
targets = element['Targets'] if 'Targets' in element else []
simpletags = [SimpleTag.fromelement(s) for s in element if s.name == 'SimpleTag']
return cls(targets, simpletags)
def __repr__(self):
return '<%s [targets=%r, simpletags=%r]>' % (self.__class__.__name__, self.targets, self.simpletags)
class SimpleTag(object):
"""Object for the SimpleTag EBML element"""
def __init__(self, name, language='und', default=True, string=None, binary=None):
self.name = name
self.language = language
self.default = default
self.string = string
self.binary = binary
@classmethod
def fromelement(cls, element):
"""Load the :class:`SimpleTag` from an :class:`~enzyme.parsers.ebml.Element`
:param element: the SimpleTag element
:type element: :class:`~enzyme.parsers.ebml.Element`
"""
name = element.get('TagName')
language = element.get('TagLanguage', 'und')
default = element.get('TagDefault', True)
string = element.get('TagString')
binary = element.get('TagBinary')
return cls(name, language, default, string, binary)
def __repr__(self):
return '<%s [%s, language=%s, default=%s, string=%s]>' % (self.__class__.__name__, self.name, self.language, self.default, self.string)
class Chapter(object):
"""Object for the ChapterAtom and ChapterDisplay EBML element
.. note::
For the sake of simplicity, it is assumed that the ChapterAtom element
has no more than 1 ChapterDisplay child element and informations it contains
are merged into the :class:`Chapter`
"""
def __init__(self, start, hidden=False, enabled=False, end=None, string=None, language=None):
self.start = start
self.hidden = hidden
self.enabled = enabled
self.end = end
self.string = string
self.language = language
@classmethod
def fromelement(cls, element):
"""Load the :class:`Chapter` from an :class:`~enzyme.parsers.ebml.Element`
:param element: the ChapterAtom element
:type element: :class:`~enzyme.parsers.ebml.Element`
"""
start = timedelta(microseconds=element.get('ChapterTimeStart') // 1000)
hidden = element.get('ChapterFlagHidden', False)
enabled = element.get('ChapterFlagEnabled', True)
end = element.get('ChapterTimeEnd')
chapterdisplays = [c for c in element if c.name == 'ChapterDisplay']
if len(chapterdisplays) > 1:
logger.warning('More than 1 (%d) ChapterDisplay element in the ChapterAtom, using the first one', len(chapterdisplays))
if chapterdisplays:
string = chapterdisplays[0].get('ChapString')
language = chapterdisplays[0].get('ChapLanguage')
return cls(start, hidden, enabled, end, string, language)
return cls(start, hidden, enabled, end)
def __repr__(self):
return '<%s [%s, enabled=%s]>' % (self.__class__.__name__, self.start, self.enabled)