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# Copyright (C) 2001-2006 Python Software Foundation 

# Author: Anthony Baxter 

# Contact: email-sig@python.org 

 

"""Class representing audio/* type MIME documents.""" 

 

__all__ = ['MIMEAudio'] 

 

import sndhdr 

 

from cStringIO import StringIO 

from email import encoders 

from email.mime.nonmultipart import MIMENonMultipart 

 

 

 

_sndhdr_MIMEmap = {'au'  : 'basic', 

                   'wav' :'x-wav', 

                   'aiff':'x-aiff', 

                   'aifc':'x-aiff', 

                   } 

 

# There are others in sndhdr that don't have MIME types. :( 

# Additional ones to be added to sndhdr? midi, mp3, realaudio, wma?? 

def _whatsnd(data): 

    """Try to identify a sound file type. 

 

    sndhdr.what() has a pretty cruddy interface, unfortunately.  This is why 

    we re-do it here.  It would be easier to reverse engineer the Unix 'file' 

    command and use the standard 'magic' file, as shipped with a modern Unix. 

    """ 

    hdr = data[:512] 

    fakefile = StringIO(hdr) 

    for testfn in sndhdr.tests: 

        res = testfn(hdr, fakefile) 

        if res is not None: 

            return _sndhdr_MIMEmap.get(res[0]) 

    return None 

 

 

 

class MIMEAudio(MIMENonMultipart): 

    """Class for generating audio/* MIME documents.""" 

 

    def __init__(self, _audiodata, _subtype=None, 

                 _encoder=encoders.encode_base64, **_params): 

        """Create an audio/* type MIME document. 

 

        _audiodata is a string containing the raw audio data.  If this data 

        can be decoded by the standard Python `sndhdr' module, then the 

        subtype will be automatically included in the Content-Type header. 

        Otherwise, you can specify  the specific audio subtype via the 

        _subtype parameter.  If _subtype is not given, and no subtype can be 

        guessed, a TypeError is raised. 

 

        _encoder is a function which will perform the actual encoding for 

        transport of the image data.  It takes one argument, which is this 

        Image instance.  It should use get_payload() and set_payload() to 

        change the payload to the encoded form.  It should also add any 

        Content-Transfer-Encoding or other headers to the message as 

        necessary.  The default encoding is Base64. 

 

        Any additional keyword arguments are passed to the base class 

        constructor, which turns them into parameters on the Content-Type 

        header. 

        """ 

        if _subtype is None: 

            _subtype = _whatsnd(_audiodata) 

        if _subtype is None: 

            raise TypeError('Could not find audio MIME subtype') 

        MIMENonMultipart.__init__(self, 'audio', _subtype, **_params) 

        self.set_payload(_audiodata) 

        _encoder(self)