Computing a hash code on for an Audio CD

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Philip Niznik - 25 Oct 2007 19:07 GMT

Hi All,
This may be a framework question rather than specific to c#, but does
anyone know the best approach to computing a hashcode for an audio CD
(so I can check if the content of one cd is equal or different to
another) ?
I guess the first thing I need to be able to do is get access to the
CD audio data so that I can get a inputstream for hashing? At the
moment I can't see any classes that understand how to access audio
CD's?
Thanks,
Phill

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Chris Shepherd - 25 Oct 2007 19:42 GMT

> Hi All,
> This may be a framework question rather than specific to c#, but does
[quoted text clipped - 5 lines]
> moment I can't see any classes that understand how to access audio
> CD's?

You mean, like for CDDB queries?
http://www.codeproject.com/cs/media/freedb.asp

Chris.

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Philip Niznik - 27 Oct 2007 12:04 GMT

> You mean, like for CDDB queries?http://www.codeproject.com/cs/media/freedb.asp
>
> Chris.

Thanks Chris, interesting. On first looks it appears to look at the
meta data from the cda files rather than the actual content. I need
something that looks to see if the actual content is the same. Will dl
and have a good look over this though just in case.

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Philip Niznik - 27 Oct 2007 12:20 GMT

> > You mean, like for CDDB queries?http://www.codeproject.com/cs/media/freedb.asp
>
[quoted text clipped - 4 lines]
> something that looks to see if the actual content is the same. Will dl
> and have a good look over this though just in case.

some interesting use of win32 calls, but from what I can see does read
the track content only (I am sure could be adapted, but being lazy, I
don't really want to have to understand cd audio format if at all
possible)

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Peter Bromberg [C# MVP] - 25 Oct 2007 19:45 GMT

First, I think you may be referring to a CRC32 computation rather than a
"hash code". CRC32 is used to verify such data.
You would have to use one of the supplied DirectXAudio or other classes
that are available in the DirectX SDK.
-- Peter
Recursion: see Recursion
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> Hi All,
> This may be a framework question rather than specific to c#, but does
[quoted text clipped - 7 lines]
> Thanks,
> Phill

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Philip Niznik - 27 Oct 2007 11:57 GMT

On Oct 25, 7:45 pm, Peter Bromberg [C# MVP]
<pbromb...@yahoo.yohohhoandabottleofrum.com> wrote:

> First, I think you may be referring to a CRC32 computation rather than a
> "hash code". CRC32 is used to verify such data.
> You would have to use one of the supplied DirectXAudio or other classes
> that are available in the DirectX SDK.

Thanks Peter, yes really I mean CRC32. Thanks for the pointer -
DirectX it is then.

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Computing a hash code on for an Audio CD

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