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How to use ChannelNames, CategoryNames, NumberNames?

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How to use ChannelNames, CategoryNames, NumberNames?

Subject: How to use ChannelNames, CategoryNames, NumberNames?
From: Chris Thomas <email@hidden>
Date: Wed, 5 Jan 2005 10:51:11 -0800

In AudioHardware.h I find these properties:

kAudioDevicePropertyChannelName
kAudioDevicePropertyChannelCategoryName
kAudioDevicePropertyChannelNumberName

And these IORegistry keys in IOAudioDefines.h:

#define kIOAudioEngineFullChannelNamesKey "IOAudioEngineChannelNames" #define kIOAudioEngineFullChannelCategoryNamesKey "IOAudioEngineChannelCategoryNames" #define kIOAudioEngineFullChannelNumberNamesKey "IOAudioEngineChannelNumberNames"

What is the intended semantic for these keys? The comments and HeaderDoc are not ideally descriptive. It sounds like these are dictionaries of user-readable descriptions for channels, but:

(1) What is Core Audio's definition of a "channel name", "category name", "number name"? (2) Will Core Audio synthesize names if a driver doesn't have these keys attached, or does it just return an error in that case?

Thanks,
Chris


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