[ python-Bugs-1611944 ] sndhdr.what() does not recognize wav file

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Bugs item #1611944, was opened at 2006-12-09 02:37
Message generated for change (Comment added) made by gbrandl
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Category: Python Library
Group: Python 2.5
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Floris van Manen (klankschap)
Assigned to: Nobody/Anonymous (nobody)
Summary: sndhdr.what() does not recognize wav file

Initial Comment:
using 2.5 on osx 10.4
the sndhdr.what() function fails to recognize some wav headers.
however these wav files are recognized correctly by other 'standard' applications like quicktime and itunes.



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>Comment By: Georg Brandl (gbrandl)
Date: 2006-12-09 10:26

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I see. The problem is, as the "bext" chunk can be arbitrarily long, the
test function would need more than 512 bytes to read the "fmt " chunk, or
it could return that it cannot read the format details.

Would you like to work on a patch?

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Comment By: Floris van Manen (klankschap)
Date: 2006-12-09 10:02

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Apparently the sndhdr.what() function does not skip the embedded comment
chunk at the start.


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Comment By: Floris van Manen (klankschap)
Date: 2006-12-09 09:56

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Attached you find (in a rar file) a 260kb wav file, 2 tracks, 24 bit,
44.1kHz
You can play it, ask either OSX or XP to show the properties.
Yet sndhdr.what() returns None


File Added: Audio01.rar

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Comment By: Georg Brandl (gbrandl)
Date: 2006-12-09 08:55

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We'd need some more information about these specific wave files in order
to improve sndhdr.what().

Can you try to find out why they aren't recognized correctly, or what
their header (sndhdr reads the first 512 bytes) looks like?

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