'Reload the raw data from file or URL.'

def reload(self):

    import mimetypes
    if self.embed:
        super(Audio, self).reload()
    if (self.filename is not None):
        self.mimetype = mimetypes.guess_type(self.filename)[0]
    elif (self.url is not None):
        self.mimetype = mimetypes.guess_type(self.url)[0]
    else:
        self.mimetype = 'audio/wav'
