1# Copyright (C) 2001-2006 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 9import sndhdr 10 11from cStringIO import StringIO 12from email import encoders 13from email.mime.nonmultipart import MIMENonMultipart 14 15 16 17_sndhdr_MIMEmap = {'au' : 'basic', 18 'wav' :'x-wav', 19 'aiff':'x-aiff', 20 'aifc':'x-aiff', 21 } 22 23# There are others in sndhdr that don't have MIME types. :( 24# Additional ones to be added to sndhdr? midi, mp3, realaudio, wma?? 25def _whatsnd(data): 26 """Try to identify a sound file type. 27 28 sndhdr.what() has a pretty cruddy interface, unfortunately. This is why 29 we re-do it here. It would be easier to reverse engineer the Unix 'file' 30 command and use the standard 'magic' file, as shipped with a modern Unix. 31 """ 32 hdr = data[:512] 33 fakefile = StringIO(hdr) 34 for testfn in sndhdr.tests: 35 res = testfn(hdr, fakefile) 36 if res is not None: 37 return _sndhdr_MIMEmap.get(res[0]) 38 return None 39 40 41 42class MIMEAudio(MIMENonMultipart): 43 """Class for generating audio/* MIME documents.""" 44 45 def __init__(self, _audiodata, _subtype=None, 46 _encoder=encoders.encode_base64, **_params): 47 """Create an audio/* type MIME document. 48 49 _audiodata is a string containing the raw audio data. If this data 50 can be decoded by the standard Python `sndhdr' module, then the 51 subtype will be automatically included in the Content-Type header. 52 Otherwise, you can specify the specific audio subtype via the 53 _subtype parameter. If _subtype is not given, and no subtype can be 54 guessed, a TypeError is raised. 55 56 _encoder is a function which will perform the actual encoding for 57 transport of the image data. It takes one argument, which is this 58 Image instance. It should use get_payload() and set_payload() to 59 change the payload to the encoded form. It should also add any 60 Content-Transfer-Encoding or other headers to the message as 61 necessary. The default encoding is Base64. 62 63 Any additional keyword arguments are passed to the base class 64 constructor, which turns them into parameters on the Content-Type 65 header. 66 """ 67 if _subtype is None: 68 _subtype = _whatsnd(_audiodata) 69 if _subtype is None: 70 raise TypeError('Could not find audio MIME subtype') 71 MIMENonMultipart.__init__(self, 'audio', _subtype, **_params) 72 self.set_payload(_audiodata) 73 _encoder(self) 74