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media.py
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"""Objects related to images, audio, and video."""
from __future__ import annotations
import base64
import hashlib
import os
from typing import IO
from pptx.opc.constants import CONTENT_TYPE as CT
from pptx.util import lazyproperty
class Video(object):
"""Immutable value object representing a video such as MP4."""
def __init__(self, blob: bytes, mime_type: str | None, filename: str | None):
super(Video, self).__init__()
self._blob = blob
self._mime_type = mime_type
self._filename = filename
@classmethod
def from_blob(cls, blob: bytes, mime_type: str | None, filename: str | None = None):
"""Return a new |Video| object loaded from image binary in *blob*."""
return cls(blob, mime_type, filename)
@classmethod
def from_path_or_file_like(cls, movie_file: str | IO[bytes], mime_type: str | None) -> Video:
"""Return a new |Video| object containing video in *movie_file*.
*movie_file* can be either a path (string) or a file-like
(e.g. StringIO) object.
"""
if isinstance(movie_file, str):
# treat movie_file as a path
with open(movie_file, "rb") as f:
blob = f.read()
filename = os.path.basename(movie_file)
else:
# assume movie_file is a file-like object
blob = movie_file.read()
filename = None
return cls.from_blob(blob, mime_type, filename)
@property
def blob(self):
"""The bytestream of the media "file"."""
return self._blob
@property
def content_type(self):
"""MIME-type of this media, e.g. `'video/mp4'`."""
return self._mime_type
@property
def ext(self):
"""Return the file extension for this video, e.g. 'mp4'.
The extension is that from the actual filename if known. Otherwise
it is the lowercase canonical extension for the video's MIME type.
'vid' is used if the MIME type is 'video/unknown'.
"""
if self._filename:
return os.path.splitext(self._filename)[1].lstrip(".")
return {
CT.ASF: "asf",
CT.AVI: "avi",
CT.MOV: "mov",
CT.MP4: "mp4",
CT.MPG: "mpg",
CT.MS_VIDEO: "avi",
CT.SWF: "swf",
CT.WMV: "wmv",
CT.X_MS_VIDEO: "avi",
}.get(self._mime_type, "vid")
@property
def filename(self) -> str:
"""Return a filename.ext string appropriate to this video.
The base filename from the original path is used if this image was
loaded from the filesystem. If no filename is available, such as when
the video object is created from an in-memory stream, the string
'movie.{ext}' is used where 'ext' is suitable to the video format,
such as 'mp4'.
"""
if self._filename is not None:
return self._filename
return "movie.%s" % self.ext
@lazyproperty
def sha1(self):
"""The SHA1 hash digest for the binary "file" of this video.
Example: `'1be010ea47803b00e140b852765cdf84f491da47'`
"""
return hashlib.sha1(self._blob).hexdigest()
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