Whatever UI the user is using to make the property change also needs to call
IAudioEndpointFormatControl::ResetToDefault
https://docs.microsoft.com/en-us/windows/desktop/api/audioendpoints/nf-audioendpoints-iaudioendpointformatcontrol-resettodefault
This will tear down all the active streams and cause a renegotiation of the
audio formats
________________________________
From: wdmaudiodev-bounce@xxxxxxxxxxxxx <wdmaudiodev-bounce@xxxxxxxxxxxxx> on
behalf of Culann mac Cabe <culann@xxxxxxxxxx>
Sent: Monday, October 15, 2018 6:31:51 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Can I use IAudioProcessingObject::Reset to retrigger
format negotiation without stopping previously-ongoing audio processing?
Hello wdmaudiodev people
I am writing an APO whose input format compatibilities may change
mid-audio-process, (when the user changes a certain property, which can happen
at any time).
So essentially when the User makes this property change, I'd like to restart
the whole format negotiation process, preferably without stopping audio
playback (I can accept the inevitable audio "click/pop" that will result).
Is
IAudioProcessingObject::Reset<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmsdn.microsoft.com%2F9d8c13cb-012e-4b5e-a1fd-1c2e5b9200b8&data=02%7C01%7CMatthew.van.Eerde%40microsoft.com%7C9eec7e0f2f0a4453257808d632a2bb59%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636752071962681722&sdata=Qk%2Fe9Dx3%2BOwDaVTCVTO4loU7rNm%2Fv7CkcCRvoAfZeww%3D&reserved=0>
my friend here? As far as I can tell, this will do what I need, although it's
not clear if Windows will restart audio playback (if it was ongoing) after the
Reset call and all the other calls that it precipitates.
(Btw I'm using "old-style" APO, as I need Win7 compatility).
Thanks!
Culann mac Cabe
