Re: Mixing in coreaudiod or device driver
Re: Mixing in coreaudiod or device driver
- Subject: Re: Mixing in coreaudiod or device driver
- From: Kyle Sluder <email@hidden>
- Date: Sun, 02 Jun 2013 16:00:54 -0700
On Sun, Jun 2, 2013, at 03:35 PM, Tim Hewett wrote:
> I've noticed recently in IORegistryExplorer that for some devices the
> output stream mixing now seems to be done in coreaudiod rather than the
> device driver, i.e. coreaudiod is the only user client to the device
> engine. Built-in and Bluetooth devices seem to behave normally (each
> application being a user client) but USB devices and open source devices
> like AudioReflectorDriver and Soundflower only have coreaudiod shown as a
> client.
>
> Is this down to a matter of configuration, e.g. is there a
> "setICanDoAudioMixing( bool )" method or a system default setting or such
> like?
>
> It is quite useful to be able to see which apps are using a device,
> especially those which are active, now apparently only possible under
> Leopard and Snow Leopard which continue have the original behaviour.
>
Could it be that you are seeing the effects of the new user-space driver
architecture?https://developer.apple.com/library/mac/#samplecode/UserLandDriverReference/Introduction/Intro.html
--Kyle Sluder
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