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RE: mapping a CoreAudio device to a USB device
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RE: mapping a CoreAudio device to a USB device


  • Subject: RE: mapping a CoreAudio device to a USB device
  • From: "Allen Brunson" <email@hidden>
  • Date: Mon, 7 Aug 2006 15:32:01 -0500
  • Thread-topic: mapping a CoreAudio device to a USB device

Title: RE: mapping a CoreAudio device to a USB device

Steve Checkoway wrote:
> Open the Xcode documentation window,  type IORegistry into the
> search field and you get a whole list of functions that would seem
> to help you here.

i did that, but it's still a vast topic.  i'm getting closer, though.
i was able to do this:

> 2) Search the IORegistry for a service that is a subclass of
> "IOAudioEngine" and has the same value for the property,
> "IOAudioEngineGlobalUniqueID" as the AudioDevice has for it's UID.

using IOServiceGetMatchingServices().  now i'm trying to do this:

> 3) Walk up from this service through it's parents until you find the
> IOService that represents the USB device and/or the interface page
> you are interested in.

i assume the right way to to that is with IORegistryEntryGetParentEntry(), right?
well, it works if i search for an entry in kIOServicePlane, but not in KIOUSBPlane.
i think i need a usb entry rather than a service entry, don't i?  or is there some
way to make it work with a kIOServicePlane entry?


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  • Follow-Ups:
    • Re: mapping a CoreAudio device to a USB device
      • From: Jeff Moore <email@hidden>
References: 
 >mapping a CoreAudio device to a USB device (From: "Allen Brunson" <email@hidden>)
 >Re: mapping a CoreAudio device to a USB device (From: Jeff Moore <email@hidden>)
 >RE: mapping a CoreAudio device to a USB device (From: "Allen Brunson" <email@hidden>)
 >Re: mapping a CoreAudio device to a USB device (From: Steve Checkoway <email@hidden>)

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