mirror of
https://github.com/morpheus65535/bazarr.git
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427 lines
16 KiB
Python
427 lines
16 KiB
Python
from __future__ import print_function, unicode_literals, division
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from collections import MutableSequence, OrderedDict
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import io
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from io import open
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from itertools import starmap, chain
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import os.path
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import logging
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from .formats import autodetect_format, get_format_class, get_format_identifier
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from .substation import is_valid_field_content
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from .ssaevent import SSAEvent
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from .ssastyle import SSAStyle
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from .time import make_time, ms_to_str
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from .common import PY3
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class SSAFile(MutableSequence):
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"""
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Subtitle file in SubStation Alpha format.
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This class has a list-like interface which exposes :attr:`SSAFile.events`,
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list of subtitles in the file::
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subs = SSAFile.load("subtitles.srt")
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for line in subs:
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print(line.text)
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subs.insert(0, SSAEvent(start=0, end=make_time(s=2.5), text="New first subtitle"))
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del subs[0]
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"""
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DEFAULT_INFO = OrderedDict([
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("WrapStyle", "0"),
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("ScaledBorderAndShadow", "yes"),
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("Collisions", "Normal")])
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def __init__(self):
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self.events = [] #: List of :class:`SSAEvent` instances, ie. individual subtitles.
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self.styles = OrderedDict([("Default", SSAStyle.DEFAULT_STYLE.copy())]) #: Dict of :class:`SSAStyle` instances.
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self.info = self.DEFAULT_INFO.copy() #: Dict with script metadata, ie. ``[Script Info]``.
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self.aegisub_project = OrderedDict() #: Dict with Aegisub project, ie. ``[Aegisub Project Garbage]``.
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self.fps = None #: Framerate used when reading the file, if applicable.
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self.format = None #: Format of source subtitle file, if applicable, eg. ``"srt"``.
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# ------------------------------------------------------------------------
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# I/O methods
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# ------------------------------------------------------------------------
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@classmethod
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def load(cls, path, encoding="utf-8", format_=None, fps=None, **kwargs):
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"""
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Load subtitle file from given path.
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Arguments:
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path (str): Path to subtitle file.
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encoding (str): Character encoding of input file.
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Defaults to UTF-8, you may need to change this.
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format_ (str): Optional, forces use of specific parser
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(eg. `"srt"`, `"ass"`). Otherwise, format is detected
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automatically from file contents. This argument should
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be rarely needed.
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fps (float): Framerate for frame-based formats (MicroDVD),
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for other formats this argument is ignored. Framerate might
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be detected from the file, in which case you don't need
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to specify it here (when given, this argument overrides
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autodetection).
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keep_unknown_html_tags (bool): This affects SubRip only (SRT),
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for other formats this argument is ignored.
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By default, HTML tags are converted to equivalent SubStation tags
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(eg. ``<i>`` to ``{\\i1}`` and any remaining tags are removed
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to keep the text clean. Set this parameter to ``True``
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if you want to pass through these tags (eg. ``<sub>``).
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This is useful if your output format is SRT and your player
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supports these tags.
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Returns:
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SSAFile
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Raises:
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IOError
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UnicodeDecodeError
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pysubs2.exceptions.UnknownFPSError
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pysubs2.exceptions.UnknownFormatIdentifierError
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pysubs2.exceptions.FormatAutodetectionError
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Note:
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pysubs2 may autodetect subtitle format and/or framerate. These
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values are set as :attr:`SSAFile.format` and :attr:`SSAFile.fps`
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attributes.
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Example:
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>>> subs1 = pysubs2.load("subrip-subtitles.srt")
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>>> subs2 = pysubs2.load("microdvd-subtitles.sub", fps=23.976)
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>>> subs3 = pysubs2.load("subrip-subtitles-with-fancy-tags.srt", keep_unknown_html_tags=True)
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"""
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with open(path, encoding=encoding) as fp:
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return cls.from_file(fp, format_, fps=fps, **kwargs)
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@classmethod
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def from_string(cls, string, format_=None, fps=None, **kwargs):
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"""
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Load subtitle file from string.
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See :meth:`SSAFile.load()` for full description.
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Arguments:
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string (str): Subtitle file in a string. Note that the string
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must be Unicode (in Python 2).
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Returns:
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SSAFile
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Example:
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>>> text = '''
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... 1
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... 00:00:00,000 --> 00:00:05,000
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... An example SubRip file.
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... '''
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>>> subs = SSAFile.from_string(text)
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"""
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fp = io.StringIO(string)
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return cls.from_file(fp, format_, fps=fps, **kwargs)
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@classmethod
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def from_file(cls, fp, format_=None, fps=None, **kwargs):
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"""
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Read subtitle file from file object.
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See :meth:`SSAFile.load()` for full description.
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Note:
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This is a low-level method. Usually, one of :meth:`SSAFile.load()`
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or :meth:`SSAFile.from_string()` is preferable.
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Arguments:
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fp (file object): A file object, ie. :class:`io.TextIOBase` instance.
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Note that the file must be opened in text mode (as opposed to binary).
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Returns:
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SSAFile
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"""
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if format_ is None:
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# Autodetect subtitle format, then read again using correct parser.
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# The file might be a pipe and we need to read it twice,
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# so just buffer everything.
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text = fp.read()
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fragment = text[:10000]
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format_ = autodetect_format(fragment)
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fp = io.StringIO(text)
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impl = get_format_class(format_)
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subs = cls() # an empty subtitle file
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subs.format = format_
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subs.fps = fps
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impl.from_file(subs, fp, format_, fps=fps, **kwargs)
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return subs
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def save(self, path, encoding="utf-8", format_=None, fps=None, **kwargs):
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"""
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Save subtitle file to given path.
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Arguments:
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path (str): Path to subtitle file.
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encoding (str): Character encoding of output file.
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Defaults to UTF-8, which should be fine for most purposes.
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format_ (str): Optional, specifies desired subtitle format
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(eg. `"srt"`, `"ass"`). Otherwise, format is detected
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automatically from file extension. Thus, this argument
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is rarely needed.
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fps (float): Framerate for frame-based formats (MicroDVD),
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for other formats this argument is ignored. When omitted,
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:attr:`SSAFile.fps` value is used (ie. the framerate used
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for loading the file, if any). When the :class:`SSAFile`
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wasn't loaded from MicroDVD, or if you wish save it with
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different framerate, use this argument. See also
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:meth:`SSAFile.transform_framerate()` for fixing bad
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frame-based to time-based conversions.
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kwargs: Extra options for the writer.
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Raises:
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IOError
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UnicodeEncodeError
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pysubs2.exceptions.UnknownFPSError
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pysubs2.exceptions.UnknownFormatIdentifierError
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pysubs2.exceptions.UnknownFileExtensionError
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"""
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if format_ is None:
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ext = os.path.splitext(path)[1].lower()
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format_ = get_format_identifier(ext)
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with open(path, "w", encoding=encoding) as fp:
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self.to_file(fp, format_, fps=fps, **kwargs)
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def to_string(self, format_, fps=None, **kwargs):
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"""
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Get subtitle file as a string.
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See :meth:`SSAFile.save()` for full description.
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Returns:
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str
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"""
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fp = io.StringIO()
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self.to_file(fp, format_, fps=fps, **kwargs)
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return fp.getvalue()
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def to_file(self, fp, format_, fps=None, **kwargs):
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"""
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Write subtitle file to file object.
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See :meth:`SSAFile.save()` for full description.
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Note:
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This is a low-level method. Usually, one of :meth:`SSAFile.save()`
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or :meth:`SSAFile.to_string()` is preferable.
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Arguments:
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fp (file object): A file object, ie. :class:`io.TextIOBase` instance.
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Note that the file must be opened in text mode (as opposed to binary).
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"""
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impl = get_format_class(format_)
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impl.to_file(self, fp, format_, fps=fps, **kwargs)
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# ------------------------------------------------------------------------
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# Retiming subtitles
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# ------------------------------------------------------------------------
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def shift(self, h=0, m=0, s=0, ms=0, frames=None, fps=None):
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"""
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Shift all subtitles by constant time amount.
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Shift may be time-based (the default) or frame-based. In the latter
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case, specify both frames and fps. h, m, s, ms will be ignored.
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Arguments:
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h, m, s, ms: Integer or float values, may be positive or negative.
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frames (int): When specified, must be an integer number of frames.
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May be positive or negative. fps must be also specified.
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fps (float): When specified, must be a positive number.
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Raises:
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ValueError: Invalid fps or missing number of frames.
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"""
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delta = make_time(h=h, m=m, s=s, ms=ms, frames=frames, fps=fps)
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for line in self:
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line.start += delta
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line.end += delta
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def transform_framerate(self, in_fps, out_fps):
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"""
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Rescale all timestamps by ratio of in_fps/out_fps.
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Can be used to fix files converted from frame-based to time-based
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with wrongly assumed framerate.
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Arguments:
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in_fps (float)
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out_fps (float)
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Raises:
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ValueError: Non-positive framerate given.
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"""
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if in_fps <= 0 or out_fps <= 0:
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raise ValueError("Framerates must be positive, cannot transform %f -> %f" % (in_fps, out_fps))
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ratio = in_fps / out_fps
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for line in self:
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line.start = int(round(line.start * ratio))
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line.end = int(round(line.end * ratio))
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# ------------------------------------------------------------------------
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# Working with styles
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# ------------------------------------------------------------------------
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def rename_style(self, old_name, new_name):
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"""
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Rename a style, including references to it.
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Arguments:
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old_name (str): Style to be renamed.
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new_name (str): New name for the style (must be unused).
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Raises:
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KeyError: No style named old_name.
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ValueError: new_name is not a legal name (cannot use commas)
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or new_name is taken.
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"""
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if old_name not in self.styles:
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raise KeyError("Style %r not found" % old_name)
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if new_name in self.styles:
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raise ValueError("There is already a style called %r" % new_name)
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if not is_valid_field_content(new_name):
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raise ValueError("%r is not a valid name" % new_name)
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self.styles[new_name] = self.styles[old_name]
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del self.styles[old_name]
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for line in self:
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# XXX also handle \r override tag
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if line.style == old_name:
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line.style = new_name
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def import_styles(self, subs, overwrite=True):
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"""
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Merge in styles from other SSAFile.
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Arguments:
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subs (SSAFile): Subtitle file imported from.
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overwrite (bool): On name conflict, use style from the other file
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(default: True).
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"""
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if not isinstance(subs, SSAFile):
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raise TypeError("Must supply an SSAFile.")
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for name, style in subs.styles.items():
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if name not in self.styles or overwrite:
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self.styles[name] = style
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# ------------------------------------------------------------------------
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# Helper methods
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# ------------------------------------------------------------------------
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def equals(self, other):
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"""
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Equality of two SSAFiles.
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Compares :attr:`SSAFile.info`, :attr:`SSAFile.styles` and :attr:`SSAFile.events`.
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Order of entries in OrderedDicts does not matter. "ScriptType" key in info is
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considered an implementation detail and thus ignored.
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Useful mostly in unit tests. Differences are logged at DEBUG level.
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"""
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if isinstance(other, SSAFile):
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for key in set(chain(self.info.keys(), other.info.keys())) - {"ScriptType"}:
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sv, ov = self.info.get(key), other.info.get(key)
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if sv is None:
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logging.debug("%r missing in self.info", key)
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return False
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elif ov is None:
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logging.debug("%r missing in other.info", key)
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return False
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elif sv != ov:
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logging.debug("info %r differs (self=%r, other=%r)", key, sv, ov)
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return False
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for key in set(chain(self.styles.keys(), other.styles.keys())):
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sv, ov = self.styles.get(key), other.styles.get(key)
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if sv is None:
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logging.debug("%r missing in self.styles", key)
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return False
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elif ov is None:
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logging.debug("%r missing in other.styles", key)
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return False
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elif sv != ov:
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for k in sv.FIELDS:
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if getattr(sv, k) != getattr(ov, k): logging.debug("difference in field %r", k)
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logging.debug("style %r differs (self=%r, other=%r)", key, sv.as_dict(), ov.as_dict())
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return False
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if len(self) != len(other):
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logging.debug("different # of subtitles (self=%d, other=%d)", len(self), len(other))
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return False
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for i, (se, oe) in enumerate(zip(self.events, other.events)):
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if not se.equals(oe):
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for k in se.FIELDS:
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if getattr(se, k) != getattr(oe, k): logging.debug("difference in field %r", k)
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logging.debug("event %d differs (self=%r, other=%r)", i, se.as_dict(), oe.as_dict())
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return False
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return True
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else:
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raise TypeError("Cannot compare to non-SSAFile object")
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def __repr__(self):
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if self.events:
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max_time = max(ev.end for ev in self)
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s = "<SSAFile with %d events and %d styles, last timestamp %s>" % \
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(len(self), len(self.styles), ms_to_str(max_time))
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else:
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s = "<SSAFile with 0 events and %d styles>" % len(self.styles)
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if not PY3: s = s.encode("utf-8")
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return s
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# ------------------------------------------------------------------------
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# MutableSequence implementation + sort()
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# ------------------------------------------------------------------------
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def sort(self):
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"""Sort subtitles time-wise, in-place."""
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self.events.sort()
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def __getitem__(self, item):
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return self.events[item]
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def __setitem__(self, key, value):
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if isinstance(value, SSAEvent):
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self.events[key] = value
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else:
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raise TypeError("SSAFile.events must contain only SSAEvent objects")
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def __delitem__(self, key):
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del self.events[key]
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def __len__(self):
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return len(self.events)
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def insert(self, index, value):
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if isinstance(value, SSAEvent):
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self.events.insert(index, value)
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else:
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raise TypeError("SSAFile.events must contain only SSAEvent objects")
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