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# Copyright (C) 2001-2006 Python Software Foundation
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# Author: Anthony Baxter
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# Contact: email-sig@python.org
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"""Class representing audio/* type MIME documents."""
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__all__ = ['MIMEAudio']
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import sndhdr
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from cStringIO import StringIO
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from email import encoders
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from email.mime.nonmultipart import MIMENonMultipart
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_sndhdr_MIMEmap = {'au' : 'basic',
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'wav' :'x-wav',
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'aiff':'x-aiff',
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'aifc':'x-aiff',
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}
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# There are others in sndhdr that don't have MIME types. :(
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# Additional ones to be added to sndhdr? midi, mp3, realaudio, wma??
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def _whatsnd(data):
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"""Try to identify a sound file type.
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sndhdr.what() has a pretty cruddy interface, unfortunately. This is why
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we re-do it here. It would be easier to reverse engineer the Unix 'file'
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command and use the standard 'magic' file, as shipped with a modern Unix.
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"""
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hdr = data[:512]
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fakefile = StringIO(hdr)
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for testfn in sndhdr.tests:
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res = testfn(hdr, fakefile)
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if res is not None:
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return _sndhdr_MIMEmap.get(res[0])
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return None
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class MIMEAudio(MIMENonMultipart):
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"""Class for generating audio/* MIME documents."""
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def __init__(self, _audiodata, _subtype=None,
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_encoder=encoders.encode_base64, **_params):
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"""Create an audio/* type MIME document.
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_audiodata is a string containing the raw audio data. If this data
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can be decoded by the standard Python `sndhdr' module, then the
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subtype will be automatically included in the Content-Type header.
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Otherwise, you can specify the specific audio subtype via the
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_subtype parameter. If _subtype is not given, and no subtype can be
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guessed, a TypeError is raised.
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_encoder is a function which will perform the actual encoding for
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transport of the image data. It takes one argument, which is this
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Image instance. It should use get_payload() and set_payload() to
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change the payload to the encoded form. It should also add any
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Content-Transfer-Encoding or other headers to the message as
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necessary. The default encoding is Base64.
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Any additional keyword arguments are passed to the base class
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constructor, which turns them into parameters on the Content-Type
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header.
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"""
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if _subtype is None:
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_subtype = _whatsnd(_audiodata)
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if _subtype is None:
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raise TypeError('Could not find audio MIME subtype')
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MIMENonMultipart.__init__(self, 'audio', _subtype, **_params)
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self.set_payload(_audiodata)
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_encoder(self)
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