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358 lines
11 KiB
358 lines
11 KiB
# -*- coding: utf-8 -*-
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import functools
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import logging
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import os
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import re
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import shutil
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import tempfile
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from typing import List
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from babelfish import language_converters
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from fese import container
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from fese import FFprobeSubtitleStream
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from fese import FFprobeVideoContainer
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from fese import tags
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from fese.exceptions import InvalidSource
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from subliminal.subtitle import fix_line_ending
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from subliminal_patch.core import Episode
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from subliminal_patch.core import Movie
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from subliminal_patch.providers import Provider
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from subliminal_patch.subtitle import Subtitle
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from subzero.language import Language
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logger = logging.getLogger(__name__)
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# Replace Babelfish's Language with Subzero's Language
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tags.Language = Language
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class EmbeddedSubtitle(Subtitle):
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provider_name = "embeddedsubtitles"
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hash_verifiable = False
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def __init__(self, stream, container, matches, media_type):
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super().__init__(stream.language, stream.disposition.hearing_impaired)
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if stream.disposition.forced:
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self.language = Language.rebuild(stream.language, forced=True)
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self.stream: FFprobeSubtitleStream = stream
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self.container: FFprobeVideoContainer = container
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self.forced = stream.disposition.forced
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self.page_link = self.container.path
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self.release_info = _get_pretty_release_name(stream, container)
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self.media_type = media_type
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self._matches: set = matches
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def get_matches(self, video):
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if self.hearing_impaired:
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self._matches.add("hearing_impaired")
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self._matches.add("hash")
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return self._matches
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@property
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def id(self):
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return f"{self.container.path}_{self.stream.index}"
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_ALLOWED_CODECS = ("ass", "subrip", "webvtt", "mov_text")
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class EmbeddedSubtitlesProvider(Provider):
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provider_name = "embeddedsubtitles"
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languages = {Language("por", "BR"), Language("spa", "MX")} | {
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Language.fromalpha2(l) for l in language_converters["alpha2"].codes
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}
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languages.update(set(Language.rebuild(lang, hi=True) for lang in languages))
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languages.update(set(Language.rebuild(lang, forced=True) for lang in languages))
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video_types = (Episode, Movie)
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subtitle_class = EmbeddedSubtitle
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_blacklist = set()
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def __init__(
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self,
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included_codecs=None,
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cache_dir=None,
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ffprobe_path=None,
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ffmpeg_path=None,
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hi_fallback=False,
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timeout=600,
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unknown_as_english=False,
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):
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self._included_codecs = set(included_codecs or _ALLOWED_CODECS)
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for codec in self._included_codecs:
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if codec not in _ALLOWED_CODECS:
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logger.warning("Unallowed codec: %s", codec)
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self._cache_dir = os.path.join(
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cache_dir or tempfile.gettempdir(), self.__class__.__name__.lower()
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)
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self._hi_fallback = hi_fallback
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self._unknown_as_english = unknown_as_english
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self._cached_paths = {}
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self._timeout = int(timeout)
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container.FFPROBE_PATH = ffprobe_path or container.FFPROBE_PATH
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container.FFMPEG_PATH = ffmpeg_path or container.FFMPEG_PATH
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if logger.getEffectiveLevel() == logging.DEBUG:
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container.FF_LOG_LEVEL = "warning"
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else:
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# Default is True
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container.FFMPEG_STATS = False
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tags.LANGUAGE_FALLBACK = "en" if self._unknown_as_english else None
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logger.debug("Language fallback set: %s", tags.LANGUAGE_FALLBACK)
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def initialize(self):
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os.makedirs(self._cache_dir, exist_ok=True)
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def terminate(self):
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# Remove leftovers
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shutil.rmtree(self._cache_dir, ignore_errors=True)
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def query(self, path: str, languages, media_type):
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video = _get_memoized_video_container(path)
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try:
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streams = list(_filter_subtitles(video.get_subtitles()))
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except InvalidSource as error:
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logger.error("Error trying to get subtitles for %s: %s", video, error)
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self._blacklist.add(path)
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streams = []
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streams = _discard_possible_incomplete_subtitles(streams)
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if not streams:
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logger.debug("No subtitles found for container: %s", video)
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only_forced = all(lang.forced for lang in languages)
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also_forced = any(lang.forced for lang in languages)
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allowed_streams = []
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for stream in streams:
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if stream.codec_name not in self._included_codecs:
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logger.debug(
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"Ignoring %s (codec not included in %s)",
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stream,
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self._included_codecs,
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)
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continue
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if stream.language not in languages:
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continue
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disposition = stream.disposition
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if only_forced and not disposition.forced:
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continue
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if (
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disposition.generic
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or disposition.hearing_impaired
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or (disposition.forced and also_forced)
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):
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logger.debug("Appending subtitle: %s", stream)
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allowed_streams.append(stream)
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else:
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logger.debug("Ignoring unwanted subtitle: %s", stream)
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if self._hi_fallback:
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_check_hi_fallback(allowed_streams, languages)
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logger.debug("Cache info: %s", _get_memoized_video_container.cache_info())
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return [
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EmbeddedSubtitle(stream, video, {"hash"}, media_type)
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for stream in allowed_streams
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]
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def list_subtitles(self, video, languages):
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if not self._is_path_valid(video.original_path):
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logger.debug("Ignoring video: %s", video)
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return []
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return self.query(
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video.original_path,
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languages,
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"series" if isinstance(video, Episode) else "movie",
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)
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def download_subtitle(self, subtitle: EmbeddedSubtitle):
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path = self._get_subtitle_path(subtitle)
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modifiers = _type_modifiers.get(subtitle.stream.codec_name)
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logger.debug(
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"Found modifiers for %s type: %s", subtitle.stream.codec_name, modifiers
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)
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if modifiers is not None:
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for mod in modifiers:
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logger.debug("Running %s modifier for %s", mod, path)
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mod(path, path)
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with open(path, "rb") as sub:
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content = sub.read()
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subtitle.content = fix_line_ending(content)
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def _get_subtitle_path(self, subtitle: EmbeddedSubtitle):
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container = subtitle.container
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# Check if the container is not already in the instance
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if container.path not in self._cached_paths:
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# Extract all subittle streams to avoid reading the entire
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# container over and over
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subs = list(_filter_subtitles(container.get_subtitles()))
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extracted = container.copy_subtitles(
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subs,
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self._cache_dir,
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timeout=self._timeout,
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fallback_to_convert=True,
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)
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# Add the extracted paths to the containter path key
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self._cached_paths[container.path] = extracted
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cached_path = self._cached_paths[container.path]
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# Get the subtitle file by index
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return cached_path[subtitle.stream.index]
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def _is_path_valid(self, path):
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if path in self._blacklist:
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logger.debug("Blacklisted path: %s", path)
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return False
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if not os.path.isfile(path):
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logger.debug("Inexistent file: %s", path)
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return False
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return True
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class _MemoizedFFprobeVideoContainer(FFprobeVideoContainer):
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# 128 is the default value for maxsize since Python 3.8. We ste it here for previous versions.
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@functools.lru_cache(maxsize=128)
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def get_subtitles(self, *args, **kwargs):
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return super().get_subtitles(*args, **kwargs)
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@functools.lru_cache(maxsize=8096)
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def _get_memoized_video_container(path: str):
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return _MemoizedFFprobeVideoContainer(path)
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def _filter_subtitles(subtitles: List[FFprobeSubtitleStream]):
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for subtitle in subtitles:
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if subtitle.codec_name not in _ALLOWED_CODECS:
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logger.debug("Unallowed codec: %s", subtitle)
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continue
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if subtitle.tags.language_fallback is True and any(
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(subtitle.language == sub.language) and (subtitle.index != sub.index)
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for sub in subtitles
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):
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logger.debug("Not using language fallback. Language already found")
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continue
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yield subtitle
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def _check_hi_fallback(streams, languages):
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for language in languages:
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logger.debug("Checking HI fallback for '%s' language", language)
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streams_ = [stream for stream in streams if stream.language == language]
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if len(streams_) == 1 and streams_[0].disposition.hearing_impaired:
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logger.debug(
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"HI fallback: updating %s HI to False (only subtitle found is HI)",
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streams_[0],
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)
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streams_[0].disposition.hearing_impaired = False
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streams_[0].disposition.generic = True
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elif all(stream.disposition.hearing_impaired for stream in streams_):
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for stream in streams_:
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logger.debug(
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"HI fallback: updating %s HI to False (all subtitles are HI)",
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stream,
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)
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stream.disposition.hearing_impaired = False
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stream.disposition.generic = True
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else:
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logger.debug("HI fallback not needed: %s", streams_)
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def _discard_possible_incomplete_subtitles(streams):
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"""Check frame properties from subtitle streams in order to find
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supposedly incomplete subtitles"""
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try:
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max_frames = max(stream.tags.frames for stream in streams)
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except ValueError:
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return []
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# Blatantly assume there's nothing to discard as some ffprobe streams don't
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# have number_of_frames tags
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if not max_frames:
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return streams
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logger.debug("Checking possible incomplete subtitles (max frames: %d)", max_frames)
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valid_streams = []
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for stream in streams:
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# Make sure to update stream's language to reflect disposition
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stream.language = Language.rebuild(
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stream.language, **stream.disposition.language_kwargs()
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)
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# 500 < 1200
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if not stream.language.forced and stream.tags.frames < max_frames // 2:
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logger.debug(
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"Possible bad subtitle found: %s (%s frames - %s frames)",
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stream,
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stream.tags.frames,
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max_frames,
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)
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continue
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valid_streams.append(stream)
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return valid_streams
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def _get_pretty_release_name(stream, container):
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bname = os.path.basename(container.path)
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return f"{os.path.splitext(bname)[0]}.{stream.suffix}"
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# TODO: improve this
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_SIGNS_LINE_RE = re.compile(r",([\w|_]{,15}(sign|fx|karaoke))", flags=re.IGNORECASE)
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def _clean_ass_subtitles(path, output_path):
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"""An attempt to ignore extraneous lines from ASS anime subtitles. Experimental."""
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clean_lines = []
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with open(path, "r") as f:
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lines = f.readlines()
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for line in lines:
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if _SIGNS_LINE_RE.search(line) is None:
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clean_lines.append(line)
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logger.debug("Cleaned lines: %d", abs(len(lines) - len(clean_lines)))
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with open(output_path, "w") as f:
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f.writelines(clean_lines)
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logger.debug("Lines written to output path: %s", output_path)
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_type_modifiers = {"ass": {_clean_ass_subtitles}}
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