python (3.12.0)
1 # Copyright (C) 2001-2007 Python Software Foundation
2 # Author: Anthony Baxter
3 # Contact: email-sig@python.org
4
5 """Class representing audio/* type MIME documents."""
6
7 __all__ = ['MIMEAudio']
8
9 from io import BytesIO
10 from email import encoders
11 from email.mime.nonmultipart import MIMENonMultipart
12
13
14 class ESC[4;38;5;81mMIMEAudio(ESC[4;38;5;149mMIMENonMultipart):
15 """Class for generating audio/* MIME documents."""
16
17 def __init__(self, _audiodata, _subtype=None,
18 _encoder=encoders.encode_base64, *, policy=None, **_params):
19 """Create an audio/* type MIME document.
20
21 _audiodata contains the bytes for the raw audio data. If this data
22 can be decoded as au, wav, aiff, or aifc, then the
23 subtype will be automatically included in the Content-Type header.
24 Otherwise, you can specify the specific audio subtype via the
25 _subtype parameter. If _subtype is not given, and no subtype can be
26 guessed, a TypeError is raised.
27
28 _encoder is a function which will perform the actual encoding for
29 transport of the image data. It takes one argument, which is this
30 Image instance. It should use get_payload() and set_payload() to
31 change the payload to the encoded form. It should also add any
32 Content-Transfer-Encoding or other headers to the message as
33 necessary. The default encoding is Base64.
34
35 Any additional keyword arguments are passed to the base class
36 constructor, which turns them into parameters on the Content-Type
37 header.
38 """
39 if _subtype is None:
40 _subtype = _what(_audiodata)
41 if _subtype is None:
42 raise TypeError('Could not find audio MIME subtype')
43 MIMENonMultipart.__init__(self, 'audio', _subtype, policy=policy,
44 **_params)
45 self.set_payload(_audiodata)
46 _encoder(self)
47
48
49 _rules = []
50
51
52 # Originally from the sndhdr module.
53 #
54 # There are others in sndhdr that don't have MIME types. :(
55 # Additional ones to be added to sndhdr? midi, mp3, realaudio, wma??
56 def _what(data):
57 # Try to identify a sound file type.
58 #
59 # sndhdr.what() had a pretty cruddy interface, unfortunately. This is why
60 # we re-do it here. It would be easier to reverse engineer the Unix 'file'
61 # command and use the standard 'magic' file, as shipped with a modern Unix.
62 hdr = data[:512]
63 fakefile = BytesIO(hdr)
64 for testfn in _rules:
65 if res := testfn(hdr, fakefile):
66 return res
67 else:
68 return None
69
70
71 def rule(rulefunc):
72 _rules.append(rulefunc)
73 return rulefunc
74
75
76 @rule
77 def _aiff(h, f):
78 if not h.startswith(b'FORM'):
79 return None
80 if h[8:12] in {b'AIFC', b'AIFF'}:
81 return 'x-aiff'
82 else:
83 return None
84
85
86 @rule
87 def _au(h, f):
88 if h.startswith(b'.snd'):
89 return 'basic'
90 else:
91 return None
92
93
94 @rule
95 def _wav(h, f):
96 # 'RIFF' <len> 'WAVE' 'fmt ' <len>
97 if not h.startswith(b'RIFF') or h[8:12] != b'WAVE' or h[12:16] != b'fmt ':
98 return None
99 else:
100 return "x-wav"
Browse
Usage
Versions