mirror of
https://github.com/devine-dl/devine.git
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0ba45decc6
This applies the X-TIMESTAMP-MAP data to timestamps as it reads through a concatenated (merged) WebVTT file to correct timestamps on segmented WebVTT streams. It then removes the X-TIMESTAMP-MAP header. The timescale and segment duration information is saved in the Subtitle's data dictionary under the hls/dash key: timescale (dash-only) and segment_durations. Note that this information will only be available post-download. This is done regardless if you are converting to another subtitle or not, since the downloader automatically and forcefully concatenated the segmented subtitle data. We do not support the use of segmented Subtitles for downloading or otherwise, nor do we plan to.
598 lines
25 KiB
Python
598 lines
25 KiB
Python
from __future__ import annotations
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import re
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import subprocess
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from collections import defaultdict
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from enum import Enum
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from functools import partial
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from io import BytesIO
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from pathlib import Path
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from typing import Any, Callable, Iterable, Optional, Union
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import pycaption
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import requests
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from construct import Container
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from pycaption import Caption, CaptionList, CaptionNode, WebVTTReader
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from pycaption.geometry import Layout
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from pymp4.parser import MP4
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from subtitle_filter import Subtitles
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from devine.core import binaries
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from devine.core.tracks.track import Track
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from devine.core.utilities import try_ensure_utf8
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from devine.core.utils.webvtt import merge_segmented_webvtt
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class Subtitle(Track):
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class Codec(str, Enum):
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SubRip = "SRT" # https://wikipedia.org/wiki/SubRip
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SubStationAlpha = "SSA" # https://wikipedia.org/wiki/SubStation_Alpha
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SubStationAlphav4 = "ASS" # https://wikipedia.org/wiki/SubStation_Alpha#Advanced_SubStation_Alpha=
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TimedTextMarkupLang = "TTML" # https://wikipedia.org/wiki/Timed_Text_Markup_Language
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WebVTT = "VTT" # https://wikipedia.org/wiki/WebVTT
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# MPEG-DASH box-encapsulated subtitle formats
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fTTML = "STPP" # https://www.w3.org/TR/2018/REC-ttml-imsc1.0.1-20180424
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fVTT = "WVTT" # https://www.w3.org/TR/webvtt1
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@property
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def extension(self) -> str:
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return self.value.lower()
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@staticmethod
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def from_mime(mime: str) -> Subtitle.Codec:
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mime = mime.lower().strip().split(".")[0]
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if mime == "srt":
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return Subtitle.Codec.SubRip
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elif mime == "ssa":
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return Subtitle.Codec.SubStationAlpha
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elif mime == "ass":
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return Subtitle.Codec.SubStationAlphav4
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elif mime == "ttml":
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return Subtitle.Codec.TimedTextMarkupLang
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elif mime == "vtt":
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return Subtitle.Codec.WebVTT
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elif mime == "stpp":
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return Subtitle.Codec.fTTML
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elif mime == "wvtt":
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return Subtitle.Codec.fVTT
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raise ValueError(f"The MIME '{mime}' is not a supported Subtitle Codec")
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@staticmethod
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def from_codecs(codecs: str) -> Subtitle.Codec:
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for codec in codecs.lower().split(","):
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mime = codec.strip().split(".")[0]
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try:
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return Subtitle.Codec.from_mime(mime)
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except ValueError:
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pass
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raise ValueError(f"No MIME types matched any supported Subtitle Codecs in '{codecs}'")
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@staticmethod
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def from_netflix_profile(profile: str) -> Subtitle.Codec:
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profile = profile.lower().strip()
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if profile.startswith("webvtt"):
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return Subtitle.Codec.WebVTT
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if profile.startswith("dfxp"):
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return Subtitle.Codec.TimedTextMarkupLang
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raise ValueError(f"The Content Profile '{profile}' is not a supported Subtitle Codec")
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def __init__(
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self,
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*args: Any,
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codec: Optional[Subtitle.Codec] = None,
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cc: bool = False,
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sdh: bool = False,
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forced: bool = False,
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**kwargs: Any
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):
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"""
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Create a new Subtitle track object.
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Parameters:
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codec: A Subtitle.Codec enum representing the subtitle format.
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If not specified, MediaInfo will be used to retrieve the format
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once the track has been downloaded.
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cc: Closed Caption.
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- Intended as if you couldn't hear the audio at all.
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- Can have Sound as well as Dialogue, but doesn't have to.
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- Original source would be from an EIA-CC encoded stream. Typically all
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upper-case characters.
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Indicators of it being CC without knowing original source:
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- Extracted with CCExtractor, or
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- >>> (or similar) being used at the start of some or all lines, or
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- All text is uppercase or at least the majority, or
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- Subtitles are Scrolling-text style (one line appears, oldest line
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then disappears).
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Just because you downloaded it as a SRT or VTT or such, doesn't mean it
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isn't from an EIA-CC stream. And I wouldn't take the streaming services
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(CC) as gospel either as they tend to get it wrong too.
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sdh: Deaf or Hard-of-Hearing. Also known as HOH in the UK (EU?).
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- Intended as if you couldn't hear the audio at all.
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- MUST have Sound as well as Dialogue to be considered SDH.
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- It has no "syntax" or "format" but is not transmitted using archaic
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forms like EIA-CC streams, would be intended for transmission via
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SubRip (SRT), WebVTT (VTT), TTML, etc.
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If you can see important audio/sound transcriptions and not just dialogue
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and it doesn't have the indicators of CC, then it's most likely SDH.
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If it doesn't have important audio/sounds transcriptions it might just be
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regular subtitling (you wouldn't mark as CC or SDH). This would be the
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case for most translation subtitles. Like Anime for example.
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forced: Typically used if there's important information at some point in time
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like watching Dubbed content and an important Sign or Letter is shown
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or someone talking in a different language.
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Forced tracks are recommended by the Matroska Spec to be played if
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the player's current playback audio language matches a subtitle
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marked as "forced".
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However, that doesn't mean every player works like this but there is
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no other way to reliably work with Forced subtitles where multiple
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forced subtitles may be in the output file. Just know what to expect
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with "forced" subtitles.
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Note: If codec is not specified some checks may be skipped or assume a value.
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Specifying as much information as possible is highly recommended.
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Information on Subtitle Types:
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https://bit.ly/2Oe4fLC (3PlayMedia Blog on SUB vs CC vs SDH).
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However, I wouldn't pay much attention to the claims about SDH needing to
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be in the original source language. It's logically not true.
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CC == Closed Captions. Source: Basically every site.
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SDH = Subtitles for the Deaf or Hard-of-Hearing. Source: Basically every site.
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HOH = Exact same as SDH. Is a term used in the UK. Source: https://bit.ly/2PGJatz (ICO UK)
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More in-depth information, examples, and stuff to look for can be found in the Parameter
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explanation list above.
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"""
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super().__init__(*args, **kwargs)
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if not isinstance(codec, (Subtitle.Codec, type(None))):
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raise TypeError(f"Expected codec to be a {Subtitle.Codec}, not {codec!r}")
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if not isinstance(cc, (bool, int)) or (isinstance(cc, int) and cc not in (0, 1)):
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raise TypeError(f"Expected cc to be a {bool} or bool-like {int}, not {cc!r}")
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if not isinstance(sdh, (bool, int)) or (isinstance(sdh, int) and sdh not in (0, 1)):
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raise TypeError(f"Expected sdh to be a {bool} or bool-like {int}, not {sdh!r}")
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if not isinstance(forced, (bool, int)) or (isinstance(forced, int) and forced not in (0, 1)):
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raise TypeError(f"Expected forced to be a {bool} or bool-like {int}, not {forced!r}")
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self.codec = codec
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self.cc = bool(cc)
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self.sdh = bool(sdh)
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self.forced = bool(forced)
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if self.cc and self.sdh:
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raise ValueError("A text track cannot be both CC and SDH.")
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if self.forced and (self.cc or self.sdh):
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raise ValueError("A text track cannot be CC/SDH as well as Forced.")
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# TODO: Migrate to new event observer system
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# Called after Track has been converted to another format
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self.OnConverted: Optional[Callable[[Subtitle.Codec], None]] = None
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def __str__(self) -> str:
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return " | ".join(filter(bool, [
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"SUB",
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f"[{self.codec.value}]" if self.codec else None,
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str(self.language),
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self.get_track_name()
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]))
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def get_track_name(self) -> Optional[str]:
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"""Return the base Track Name."""
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track_name = super().get_track_name() or ""
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flag = self.cc and "CC" or self.sdh and "SDH" or self.forced and "Forced"
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if flag:
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if track_name:
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flag = f" ({flag})"
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track_name += flag
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return track_name or None
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def download(
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self,
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session: requests.Session,
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prepare_drm: partial,
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max_workers: Optional[int] = None,
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progress: Optional[partial] = None
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):
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super().download(session, prepare_drm, max_workers, progress)
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if not self.path:
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return
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if self.codec == Subtitle.Codec.fTTML:
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self.convert(Subtitle.Codec.TimedTextMarkupLang)
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elif self.codec == Subtitle.Codec.fVTT:
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self.convert(Subtitle.Codec.WebVTT)
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elif self.codec == Subtitle.Codec.WebVTT:
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text = self.path.read_text("utf8")
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if self.descriptor == Track.Descriptor.DASH:
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text = merge_segmented_webvtt(
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text,
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segment_durations=self.data["dash"]["segment_durations"],
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timescale=self.data["dash"]["timescale"]
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)
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elif self.descriptor == Track.Descriptor.HLS:
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text = merge_segmented_webvtt(
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text,
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segment_durations=self.data["hls"]["segment_durations"],
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timescale=1 # ?
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)
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caption_set = pycaption.WebVTTReader().read(text)
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Subtitle.merge_same_cues(caption_set)
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subtitle_text = pycaption.WebVTTWriter().write(caption_set)
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self.path.write_text(subtitle_text, encoding="utf8")
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def convert(self, codec: Subtitle.Codec) -> Path:
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"""
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Convert this Subtitle to another Format.
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The file path location of the Subtitle data will be kept at the same
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location but the file extension will be changed appropriately.
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Supported formats:
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- SubRip - SubtitleEdit or pycaption.SRTWriter
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- TimedTextMarkupLang - SubtitleEdit or pycaption.DFXPWriter
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- WebVTT - SubtitleEdit or pycaption.WebVTTWriter
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- SubStationAlphav4 - SubtitleEdit
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- fTTML* - custom code using some pycaption functions
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- fVTT* - custom code using some pycaption functions
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*: Can read from format, but cannot convert to format
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Note: It currently prioritizes using SubtitleEdit over PyCaption as
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I have personally noticed more oddities with PyCaption parsing over
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SubtitleEdit. Especially when working with TTML/DFXP where it would
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often have timecodes and stuff mixed in/duplicated.
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Returns the new file path of the Subtitle.
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"""
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if not self.path or not self.path.exists():
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raise ValueError("You must download the subtitle track first.")
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if self.codec == codec:
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return self.path
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output_path = self.path.with_suffix(f".{codec.value.lower()}")
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if binaries.SubtitleEdit and self.codec not in (Subtitle.Codec.fTTML, Subtitle.Codec.fVTT):
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sub_edit_format = {
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Subtitle.Codec.SubStationAlphav4: "AdvancedSubStationAlpha",
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Subtitle.Codec.TimedTextMarkupLang: "TimedText1.0"
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}.get(codec, codec.name)
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sub_edit_args = [
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binaries.SubtitleEdit,
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"/Convert", self.path, sub_edit_format,
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f"/outputfilename:{output_path.name}",
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"/encoding:utf8"
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]
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if codec == Subtitle.Codec.SubRip:
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sub_edit_args.append("/ConvertColorsToDialog")
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subprocess.run(
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sub_edit_args,
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check=True,
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stdout=subprocess.DEVNULL,
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stderr=subprocess.DEVNULL
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)
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else:
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writer = {
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# pycaption generally only supports these subtitle formats
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Subtitle.Codec.SubRip: pycaption.SRTWriter,
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Subtitle.Codec.TimedTextMarkupLang: pycaption.DFXPWriter,
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Subtitle.Codec.WebVTT: pycaption.WebVTTWriter,
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}.get(codec)
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if writer is None:
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raise NotImplementedError(f"Cannot yet convert {self.codec.name} to {codec.name}.")
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caption_set = self.parse(self.path.read_bytes(), self.codec)
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Subtitle.merge_same_cues(caption_set)
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subtitle_text = writer().write(caption_set)
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output_path.write_text(subtitle_text, encoding="utf8")
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self.path = output_path
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self.codec = codec
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if callable(self.OnConverted):
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self.OnConverted(codec)
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return output_path
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@staticmethod
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def parse(data: bytes, codec: Subtitle.Codec) -> pycaption.CaptionSet:
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if not isinstance(data, bytes):
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raise ValueError(f"Subtitle data must be parsed as bytes data, not {type(data).__name__}")
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try:
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if codec == Subtitle.Codec.SubRip:
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text = try_ensure_utf8(data).decode("utf8")
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caption_set = pycaption.SRTReader().read(text)
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elif codec == Subtitle.Codec.fTTML:
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caption_lists: dict[str, pycaption.CaptionList] = defaultdict(pycaption.CaptionList)
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for segment in (
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Subtitle.parse(box.data, Subtitle.Codec.TimedTextMarkupLang)
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for box in MP4.parse_stream(BytesIO(data))
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if box.type == b"mdat"
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):
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for lang in segment.get_languages():
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caption_lists[lang].extend(segment.get_captions(lang))
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caption_set: pycaption.CaptionSet = pycaption.CaptionSet(caption_lists)
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elif codec == Subtitle.Codec.TimedTextMarkupLang:
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text = try_ensure_utf8(data).decode("utf8")
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text = text.replace("tt:", "")
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# negative size values aren't allowed in TTML/DFXP spec, replace with 0
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text = re.sub(r'"(-\d+(\.\d+)?(px|em|%|c|pt))"', '"0"', text)
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caption_set = pycaption.DFXPReader().read(text)
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elif codec == Subtitle.Codec.fVTT:
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caption_lists: dict[str, pycaption.CaptionList] = defaultdict(pycaption.CaptionList)
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caption_list, language = Subtitle.merge_segmented_wvtt(data)
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caption_lists[language] = caption_list
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caption_set: pycaption.CaptionSet = pycaption.CaptionSet(caption_lists)
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elif codec == Subtitle.Codec.WebVTT:
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text = Subtitle.space_webvtt_headers(data)
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caption_set = pycaption.WebVTTReader().read(text)
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else:
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raise ValueError(f"Unknown Subtitle format \"{codec}\"...")
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except pycaption.exceptions.CaptionReadSyntaxError as e:
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raise SyntaxError(f"A syntax error has occurred when reading the \"{codec}\" subtitle: {e}")
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except pycaption.exceptions.CaptionReadNoCaptions:
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return pycaption.CaptionSet({"en": []})
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# remove empty caption lists or some code breaks, especially if it's the first list
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for language in caption_set.get_languages():
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if not caption_set.get_captions(language):
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# noinspection PyProtectedMember
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del caption_set._captions[language]
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return caption_set
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@staticmethod
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def space_webvtt_headers(data: Union[str, bytes]):
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"""
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Space out the WEBVTT Headers from Captions.
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Segmented VTT when merged may have the WEBVTT headers part of the next caption
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as they were not separated far enough from the previous caption and ended up
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being considered as caption text rather than the header for the next segment.
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"""
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if isinstance(data, bytes):
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data = try_ensure_utf8(data).decode("utf8")
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elif not isinstance(data, str):
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raise ValueError(f"Expecting data to be a str, not {data!r}")
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text = data.replace("WEBVTT", "\n\nWEBVTT").\
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replace("\r", "").\
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replace("\n\n\n", "\n \n\n").\
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replace("\n\n<", "\n<")
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return text
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@staticmethod
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def merge_same_cues(caption_set: pycaption.CaptionSet):
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"""Merge captions with the same timecodes and text as one in-place."""
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for lang in caption_set.get_languages():
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captions = caption_set.get_captions(lang)
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last_caption = None
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concurrent_captions = pycaption.CaptionList()
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merged_captions = pycaption.CaptionList()
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for caption in captions:
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if last_caption:
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if (caption.start, caption.end) == (last_caption.start, last_caption.end):
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if caption.get_text() != last_caption.get_text():
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concurrent_captions.append(caption)
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last_caption = caption
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continue
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else:
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merged_captions.append(pycaption.base.merge(concurrent_captions))
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concurrent_captions = [caption]
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last_caption = caption
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if concurrent_captions:
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merged_captions.append(pycaption.base.merge(concurrent_captions))
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if merged_captions:
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caption_set.set_captions(lang, merged_captions)
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@staticmethod
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def merge_segmented_wvtt(data: bytes, period_start: float = 0.) -> tuple[CaptionList, Optional[str]]:
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"""
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Convert Segmented DASH WebVTT cues into a pycaption Caption List.
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Also returns an ISO 639-2 alpha-3 language code if available.
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Code ported originally by xhlove to Python from shaka-player.
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Has since been improved upon by rlaphoenix using pymp4 and
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pycaption functions.
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"""
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captions = CaptionList()
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# init:
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saw_wvtt_box = False
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timescale = None
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language = None
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# media:
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# > tfhd
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default_duration = None
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# > tfdt
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saw_tfdt_box = False
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base_time = 0
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# > trun
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saw_trun_box = False
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samples = []
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def flatten_boxes(box: Container) -> Iterable[Container]:
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for child in box:
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if hasattr(child, "children"):
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yield from flatten_boxes(child.children)
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del child["children"]
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if hasattr(child, "entries"):
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yield from flatten_boxes(child.entries)
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del child["entries"]
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# some boxes (mainly within 'entries') uses format not type
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child["type"] = child.get("type") or child.get("format")
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yield child
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for box in flatten_boxes(MP4.parse_stream(BytesIO(data))):
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# init
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if box.type == b"mdhd":
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timescale = box.timescale
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language = box.language
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if box.type == b"wvtt":
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saw_wvtt_box = True
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# media
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if box.type == b"styp":
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# essentially the start of each segment
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# media var resets
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# > tfhd
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default_duration = None
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# > tfdt
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saw_tfdt_box = False
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base_time = 0
|
|
# > trun
|
|
saw_trun_box = False
|
|
samples = []
|
|
|
|
if box.type == b"tfhd":
|
|
if box.flags.default_sample_duration_present:
|
|
default_duration = box.default_sample_duration
|
|
|
|
if box.type == b"tfdt":
|
|
saw_tfdt_box = True
|
|
base_time = box.baseMediaDecodeTime
|
|
|
|
if box.type == b"trun":
|
|
saw_trun_box = True
|
|
samples = box.sample_info
|
|
|
|
if box.type == b"mdat":
|
|
if not timescale:
|
|
raise ValueError("Timescale was not found in the Segmented WebVTT.")
|
|
if not saw_wvtt_box:
|
|
raise ValueError("The WVTT box was not found in the Segmented WebVTT.")
|
|
if not saw_tfdt_box:
|
|
raise ValueError("The TFDT box was not found in the Segmented WebVTT.")
|
|
if not saw_trun_box:
|
|
raise ValueError("The TRUN box was not found in the Segmented WebVTT.")
|
|
|
|
vttc_boxes = MP4.parse_stream(BytesIO(box.data))
|
|
current_time = base_time + period_start
|
|
|
|
for sample, vttc_box in zip(samples, vttc_boxes):
|
|
duration = sample.sample_duration or default_duration
|
|
if sample.sample_composition_time_offsets:
|
|
current_time += sample.sample_composition_time_offsets
|
|
|
|
start_time = current_time
|
|
end_time = current_time + (duration or 0)
|
|
current_time = end_time
|
|
|
|
if vttc_box.type == b"vtte":
|
|
# vtte is a vttc that's empty, skip
|
|
continue
|
|
|
|
layout: Optional[Layout] = None
|
|
nodes: list[CaptionNode] = []
|
|
|
|
for cue_box in vttc_box.children:
|
|
if cue_box.type == b"vsid":
|
|
# this is a V(?) Source ID box, we don't care
|
|
continue
|
|
if cue_box.type == b"sttg":
|
|
layout = Layout(webvtt_positioning=cue_box.settings)
|
|
elif cue_box.type == b"payl":
|
|
nodes.extend([
|
|
node
|
|
for line in cue_box.cue_text.split("\n")
|
|
for node in [
|
|
CaptionNode.create_text(WebVTTReader()._decode(line)),
|
|
CaptionNode.create_break()
|
|
]
|
|
])
|
|
nodes.pop()
|
|
|
|
if nodes:
|
|
caption = Caption(
|
|
start=start_time * timescale, # as microseconds
|
|
end=end_time * timescale,
|
|
nodes=nodes,
|
|
layout_info=layout
|
|
)
|
|
p_caption = captions[-1] if captions else None
|
|
if p_caption and caption.start == p_caption.end and str(caption.nodes) == str(p_caption.nodes):
|
|
# it's a duplicate, but lets take its end time
|
|
p_caption.end = caption.end
|
|
continue
|
|
captions.append(caption)
|
|
|
|
return captions, language
|
|
|
|
def strip_hearing_impaired(self) -> None:
|
|
"""
|
|
Strip captions for hearing impaired (SDH).
|
|
It uses SubtitleEdit if available, otherwise filter-subs.
|
|
"""
|
|
if not self.path or not self.path.exists():
|
|
raise ValueError("You must download the subtitle track first.")
|
|
|
|
if binaries.SubtitleEdit:
|
|
if self.codec == Subtitle.Codec.SubStationAlphav4:
|
|
output_format = "AdvancedSubStationAlpha"
|
|
elif self.codec == Subtitle.Codec.TimedTextMarkupLang:
|
|
output_format = "TimedText1.0"
|
|
else:
|
|
output_format = self.codec.name
|
|
subprocess.run(
|
|
[
|
|
binaries.SubtitleEdit,
|
|
"/Convert", self.path, output_format,
|
|
"/encoding:utf8",
|
|
"/overwrite",
|
|
"/RemoveTextForHI"
|
|
],
|
|
check=True,
|
|
stdout=subprocess.DEVNULL
|
|
)
|
|
else:
|
|
sub = Subtitles(self.path)
|
|
sub.filter(
|
|
rm_fonts=True,
|
|
rm_ast=True,
|
|
rm_music=True,
|
|
rm_effects=True,
|
|
rm_names=True,
|
|
rm_author=True
|
|
)
|
|
sub.save()
|
|
|
|
def reverse_rtl(self) -> None:
|
|
"""
|
|
Reverse RTL (Right to Left) Start/End on Captions.
|
|
This can be used to fix the positioning of sentence-ending characters.
|
|
"""
|
|
if not self.path or not self.path.exists():
|
|
raise ValueError("You must download the subtitle track first.")
|
|
|
|
if not binaries.SubtitleEdit:
|
|
raise EnvironmentError("SubtitleEdit executable not found...")
|
|
|
|
if self.codec == Subtitle.Codec.SubStationAlphav4:
|
|
output_format = "AdvancedSubStationAlpha"
|
|
elif self.codec == Subtitle.Codec.TimedTextMarkupLang:
|
|
output_format = "TimedText1.0"
|
|
else:
|
|
output_format = self.codec.name
|
|
|
|
subprocess.run(
|
|
[
|
|
binaries.SubtitleEdit,
|
|
"/Convert", self.path, output_format,
|
|
"/ReverseRtlStartEnd",
|
|
"/encoding:utf8",
|
|
"/overwrite"
|
|
],
|
|
check=True,
|
|
stdout=subprocess.DEVNULL
|
|
)
|
|
|
|
|
|
__all__ = ("Subtitle",)
|