Re: USB audio class - kIOAudioControlUsagePassThru implementation
Re: USB audio class - kIOAudioControlUsagePassThru implementation
- Subject: Re: USB audio class - kIOAudioControlUsagePassThru implementation
- From: Jeff Moore <email@hidden>
- Date: Wed, 12 May 2010 08:38:46 -0700
I don't believe that our current USB Audio class driver has any support for play-through controls. So, it isn't really looking for anything in that area. If you have a device that has such controls and would like to see support added, please file a bug and let us know what that device is.
If you are looking to create a driver that supports play-through controls, then there really isn't any guidance to give as you have free reign. Presumably, you know your hardware and know how to implement such support. From the IOAudio perspective, connecting it to the outside world becomes just a matter of implementing and instantiating the appropriate IOAudioControl objects.
On May 12, 2010, at 1:00 AM, Daniel Mack wrote:
> On Mon, May 10, 2010 at 07:38:58PM +0200, Daniel Mack wrote:
>> I'm wondering how kIOAudioControlUsagePassThru controls are supposed to
>> be mapped into USB audio class compliant devices. The USB audio standard
>> (v2 in my case) does not describe this kind of control selector
>> specifically, so I would guess the only way is to define an extension
>> unit or to use mixer elements.
>>
>> The AppleUSBAudioDriver seems to do other fancy things though, and I
>> didn't fully get my head around yet what it really looks for in the
>> descriptors. Can anyone shed some light maybe?
>
> Any idea, anyone?
--
Jeff Moore
Core Audio
Apple
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