Standard GUID for Audio types

Hi all,
   In order to work with various codec vendors, I understand that standard
guids for video formats are often derived from FOURCC code, such as H263,
H264 as shown here

http://msdn2.microsoft.com/en-us/library/ms867195.aspx#fourcccodes

and guid can be derived from it like this

GUID g2 = (GUID)FOURCCMap(FCC('H263'));
 
g2 outputs
0x33363248, 0x0000, 0x0010, 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71

But what about audio type guids? how is it derived?
How does one vendor decide what audio guid to use so it can work with other
vendors?

thx!
fungi8210Asked:
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jkrConnect With a Mentor Commented:
You are referring to

DEFINE_GUID( GUID_DEVCLASS_SOUND, 0x4d36e97cL, 0xe325, 0x11ce, 0xbf, 0xc1, 0x08, 0x00, 0x2b, 0xe1, 0x03, 0x18 );

(defined in 'devguid.h')
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MereteCommented:
This may hold some ideas for you about how vendors decide what audio guid to use so it can work with other vendors.
Its nice little read
AUDIO GUIDE
for Web Developers
http://www.walthowe.com/pubweb/audio.html
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MereteCommented:
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jkrCommented:
Um, http:#19647553 has exactly what was being asked for...
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