# -*- coding: utf-8 -*-
from __future__ import absolute_import
import codecs
import logging
import os
import chardet
import pysrt
from .score import get_equivalent_release_groups
from .video import Episode, Movie
from .utils import sanitize, sanitize_release_group
logger = logging.getLogger(__name__)
#: Subtitle extensions
SUBTITLE_EXTENSIONS = ('.srt', '.sub', '.smi', '.txt', '.ssa', '.ass', '.mpl')
class Subtitle(object):
"""Base class for subtitle.
:param language: language of the subtitle.
:type language: :class:`~babelfish.language.Language`
:param bool hearing_impaired: whether or not the subtitle is hearing impaired.
:param page_link: URL of the web page from which the subtitle can be downloaded.
:type page_link: str
:param encoding: Text encoding of the subtitle.
:type encoding: str
"""
#: Name of the provider that returns that class of subtitle
provider_name = ''
def __init__(self, language, hearing_impaired=False, page_link=None, encoding=None):
#: Language of the subtitle
self.language = language
#: Whether or not the subtitle is hearing impaired
self.hearing_impaired = hearing_impaired
#: URL of the web page from which the subtitle can be downloaded
self.page_link = page_link
#: Content as bytes
self.content = None
#: Encoding to decode with when accessing :attr:`text`
self.encoding = None
# validate the encoding
if encoding:
try:
self.encoding = codecs.lookup(encoding).name
except (TypeError, LookupError):
logger.debug('Unsupported encoding %s', encoding)
@property
def id(self):
"""Unique identifier of the subtitle"""
raise NotImplementedError
@property
def text(self):
"""Content as string
If :attr:`encoding` is None, the encoding is guessed with :meth:`guess_encoding`
"""
if not self.content:
return
if self.encoding:
return self.content.decode(self.encoding, errors='replace')
return self.content.decode(self.guess_encoding(), errors='replace')
def is_valid(self):
"""Check if a :attr:`text` is a valid SubRip format.
:return: whether or not the subtitle is valid.
:rtype: bool
"""
if not self.text:
return False
try:
pysrt.from_string(self.text, error_handling=pysrt.ERROR_RAISE)
except pysrt.Error as e:
if e.args[0] < 80:
return False
return True
def guess_encoding(self):
"""Guess encoding using the language, falling back on chardet.
:return: the guessed encoding.
:rtype: str
"""
logger.info('Guessing encoding for language %s', self.language)
# always try utf-8 first
encodings = ['utf-8']
# add language-specific encodings
if self.language.alpha3 == 'zho':
encodings.extend(['gb18030', 'big5'])
elif self.language.alpha3 == 'jpn':
encodings.append('shift-jis')
elif self.language.alpha3 == 'ara':
encodings.append('windows-1256')
elif self.language.alpha3 == 'heb':
encodings.append('windows-1255')
elif self.language.alpha3 == 'tur':
encodings.extend(['iso-8859-9', 'windows-1254'])
elif self.language.alpha3 == 'pol':
# Eastern European Group 1
encodings.extend(['windows-1250'])
elif self.language.alpha3 == 'bul':
# Eastern European Group 2
encodings.extend(['windows-1251'])
else:
# Western European (windows-1252)
encodings.append('latin-1')
# try to decode
logger.debug('Trying encodings %r', encodings)
for encoding in encodings:
try:
self.content.decode(encoding)
except UnicodeDecodeError:
pass
else:
logger.info('Guessed encoding %s', encoding)
return encoding
logger.warning('Could not guess encoding from language')
# fallback on chardet
encoding = chardet.detect(self.content)['encoding']
logger.info('Chardet found encoding %s', encoding)
return encoding
def get_matches(self, video):
"""Get the matches against the `video`.
:param video: the video to get the matches with.
:type video: :class:`~subliminal.video.Video`
:return: matches of the subtitle.
:rtype: set
"""
raise NotImplementedError
def __hash__(self):
return hash(self.provider_name + '-' + self.id)
def __repr__(self):
return '<%s %r [%s]>' % (self.__class__.__name__, self.id, self.language)
def get_subtitle_path(video_path, language=None, extension='.srt'):
"""Get the subtitle path using the `video_path` and `language`.
:param str video_path: path to the video.
:param language: language of the subtitle to put in the path.
:type language: :class:`~babelfish.language.Language`
:param str extension: extension of the subtitle.
:return: path of the subtitle.
:rtype: str
"""
subtitle_root = os.path.splitext(video_path)[0]
if language:
subtitle_root += '.' + str(language)
return subtitle_root + extension
def guess_matches(video, guess, partial=False):
"""Get matches between a `video` and a `guess`.
If a guess is `partial`, the absence information won't be counted as a match.
:param video: the video.
:type video: :class:`~subliminal.video.Video`
:param guess: the guess.
:type guess: dict
:param bool partial: whether or not the guess is partial.
:return: matches between the `video` and the `guess`.
:rtype: set
"""
matches = set()
if isinstance(video, Episode):
# series
if video.series and 'title' in guess and sanitize(guess['title']) == sanitize(video.series):
matches.add('series')
# title
if video.title and 'episode_title' in guess and sanitize(guess['episode_title']) == sanitize(video.title):
matches.add('title')
# season
if video.season and 'season' in guess and guess['season'] == video.season:
matches.add('season')
# episode
# Currently we only have single-ep support (guessit returns a multi-ep as a list with int values)
# Most providers only support single-ep, so make sure it contains only 1 episode
# In case of multi-ep, take the lowest episode (subtitles will normally be available on lowest episode number)
if video.episode and 'episode' in guess:
episode_guess = guess['episode']
episode = min(episode_guess) if episode_guess and isinstance(episode_guess, list) else episode_guess
if episode == video.episode:
matches.add('episode')
# year
if video.year and 'year' in guess and guess['year'] == video.year:
matches.add('year')
# count "no year" as an information
if not partial and video.original_series and 'year' not in guess:
matches.add('year')
elif isinstance(video, Movie):
# year
if video.year and 'year' in guess and guess['year'] == video.year:
matches.add('year')
# title
if video.title and 'title' in guess and sanitize(guess['title']) == sanitize(video.title):
matches.add('title')
# release_group
if (video.release_group and 'release_group' in guess and
sanitize_release_group(guess['release_group']) in
get_equivalent_release_groups(sanitize_release_group(video.release_group))):
matches.add('release_group')
# resolution
if video.resolution and 'screen_size' in guess and guess['screen_size'] == video.resolution:
matches.add('resolution')
# format
if video.format and 'format' in guess and guess['format'].lower() == video.format.lower():
matches.add('format')
# video_codec
if video.video_codec and 'video_codec' in guess and guess['video_codec'] == video.video_codec:
matches.add('video_codec')
# audio_codec
if video.audio_codec and 'audio_codec' in guess and guess['audio_codec'] == video.audio_codec:
matches.add('audio_codec')
return matches
def fix_line_ending(content):
"""Fix line ending of `content` by changing it to \n.
:param bytes content: content of the subtitle.
:return: the content with fixed line endings.
:rtype: bytes
"""
return content.replace(b'\r\n', b'\n')