Re: Default device notifications
Re: Default device notifications
- Subject: Re: Default device notifications
- From: "John Haggerty" <email@hidden>
- Date: Fri, 28 Jul 2006 15:51:34 -0700
Actually, I am trying to change between Line in and a USB mic. No
notifications if I change the device in System Preferences, but I do
get a notification if the default device is the USB mic and I remove
it. And at the risk of appearing a complete gumby, what is AMS?
On 7/28/06, Jeff Moore <email@hidden> wrote:
Let me guess, you are switching from "line in" to "built-in mic" or
something like that?
The Sound Prefs panel has an expanded view of what a device is when
it comes to the built-in hardware. Instead of just listing the built-
in hardware as one device, it lists each entry in the built-in
hardware's data source selector control as if it was a device. You
can see the differences if you compare the device list displayed in
AMS with the Sound Prefs.
Whenever you select one of these "devices" you are in reality not
changing the default device, but rather changing the value of it's
data source selector control. So if you want notifications about
this, you need to pay attention to those notifications. Note however,
that this is complicated by the fact that not every device has a
source selector (including the built-in hadware on the various models
of Macs we have put out over the years) and that you'd only want to
listen to it when it's owning device is already selected as the
default device.
On Jul 28, 2006, at 3:09 PM, John Haggerty wrote:
> I am trying to set things up so that I get notifications when the
> default device is changed, for example via System Preferences.
>
> I am adding a callback thusly:
> AudioHardwareAddPropertyListener
> (kAudioHardwarePropertyDefaultInputDevice,...)
>
> This works if the actual hardware changes (e.g. if the default
> input device is a USB mic and I remove it) but not if I change the
> default device in System Preferences. Do I have to register another
> callback for this?
--
Jeff Moore
Core Audio
Apple
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