What is a good audio library for validating files in Python?

I'm already checking for content-type, size, and extension (Django (audio) File Validation), but I need a library to read the file and confirm that it is in fact what I hope it is (mp3 and mp4 mostly).

I've been here: http://wiki.python.org/moin/Audio/ but no luck. Been at this one for a while, am a bit lost in the woods. Relying on SO big time for this whole end of things...

Thanks in advance.

EDIT: I'm already (in Django) using UploadedFile.content_type() :

"The content-type header uploaded with the file (e.g. text/plain or application/pdf). Like any data supplied by the user, you shouldn't trust that the uploaded file is actually this type. You'll still need to validate that the 开发者_如何转开发file contains the content that the content-type header claims -- "trust but verify."

So, I'm already reading the header. But how can I validate the actual content of the file?

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If just checking the header isn't good enough, I'd recommend using mutagen to load the file. It should throw an exception if it's not correct.

FYI, I do not think your approach is very scalable. Is it really necessary to read every byte of the file? What is your reason for not trusting the file header?

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You can call a unix sub-shell within python like this:

>>> filename = 'Giant Steps.mp3'
>>> import os
>>> type = os.system('file %s' % filename)
Giant Steps.mp3: ISO Media, MPEG v4 system, iTunes AAC-LC

** See man pages for more details on the 'file' command if you want to go this route.

See this post for other options

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Use sndhdr

It does a little more than content-type. Reads the file and gets it's headers..of course this is still not foolproof..using ffmpeg is probably then the only option.