Hi Ed,

Thanks a lot for the info.
As it is a virtual driver for RAVENNA/AES67 audio protocol, I think there is 
some chance to make CoreAudio thinks number of channels has changed.
Hopefully this will not generate too many side effects…

Bertrand

From: Ed Wynne <[email protected]>
Sent: Thursday, April 15, 2021 7:23 PM
To: Bertrand Van Kempen <[email protected]>
Cc: [email protected]; [email protected]
Subject: Re: kAudioObjectPropertyElementName notification from plugins ignored 
by HAL/Applications


On Apr 15, 2021, at 2:15 AM, Bertrand Van Kempen 
<[email protected]<mailto:[email protected]>> wrote:

Do you know which others notifications I could use to "force" the 
Application/HAL to ask again channels' name?
Otherwise I'll have to inform users to relaunch the application by itself ;(

Unfortunately, this behavior is entirely voluntary and worse, a bit hard to 
discover. So it has been my experience, over the past decade or so, that almost 
no applications actually do it.

The only sure fire work around that I know of is to either make the channels in 
question, or the entire device, go away and come back. Unfortunately, if this 
isn’t a virtual device you control, that is pretty hard to do outside of 
whacking coreaudiod… and I really don’t recommend that, as it both requires 
admin privileges and causes other issues.

-Ed

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