1 # Copyright (C) 2001-2006 Python Software Foundation 2 # Author: Anthony Baxter 3 # Contact: email-sig (at] python.org 4 5 """Class representing audio/* type MIME documents.""" 6 7 __all__ = ['MIMEAudio'] 8 9 import sndhdr 10 11 from cStringIO import StringIO 12 from email import encoders 13 from email.mime.nonmultipart import MIMENonMultipart 14 15 16 18 _sndhdr_MIMEmap = {'au' : 'basic', 19 'wav' :'x-wav', 20 'aiff':'x-aiff', 21 'aifc':'x-aiff', 22 } 23 24 # There are others in sndhdr that don't have MIME types. :( 25 # Additional ones to be added to sndhdr? midi, mp3, realaudio, wma?? 26 def _whatsnd(data): 27 """Try to identify a sound file type. 28 29 sndhdr.what() has a pretty cruddy interface, unfortunately. This is why 30 we re-do it here. It would be easier to reverse engineer the Unix 'file' 31 command and use the standard 'magic' file, as shipped with a modern Unix. 32 """ 33 hdr = data[:512] 34 fakefile = StringIO(hdr) 35 for testfn in sndhdr.tests: 36 res = testfn(hdr, fakefile) 37 if res is not None: 38 return _sndhdr_MIMEmap.get(res[0]) 39 return None 40 41 42 44 class MIMEAudio(MIMENonMultipart): 45 """Class for generating audio/* MIME documents.""" 46 47 def __init__(self, _audiodata, _subtype=None, 48 _encoder=encoders.encode_base64, **_params): 49 """Create an audio/* type MIME document. 50 51 _audiodata is a string containing the raw audio data. If this data 52 can be decoded by the standard Python `sndhdr' module, then the 53 subtype will be automatically included in the Content-Type header. 54 Otherwise, you can specify the specific audio subtype via the 55 _subtype parameter. If _subtype is not given, and no subtype can be 56 guessed, a TypeError is raised. 57 58 _encoder is a function which will perform the actual encoding for 59 transport of the image data. It takes one argument, which is this 60 Image instance. It should use get_payload() and set_payload() to 61 change the payload to the encoded form. It should also add any 62 Content-Transfer-Encoding or other headers to the message as 63 necessary. The default encoding is Base64. 64 65 Any additional keyword arguments are passed to the base class 66 constructor, which turns them into parameters on the Content-Type 67 header. 68 """ 69 if _subtype is None: 70 _subtype = _whatsnd(_audiodata) 71 if _subtype is None: 72 raise TypeError('Could not find audio MIME subtype') 73 MIMENonMultipart.__init__(self, 'audio', _subtype, **_params) 74 self.set_payload(_audiodata) 75 _encoder(self) 76
