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bazarr/libs/subliminal_patch/providers/embeddedsubtitles.py

348 lines
11 KiB

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