Re: PerformDeviceConfigurationChange sequence

Subject: Re: PerformDeviceConfigurationChange sequence
From: Ploytec <email@hidden>
Date: Fri, 28 Feb 2014 19:21:25 +0100

Hi Jeff,

Thanks for the reply.

I'm not sure I understand your suggestion.

28/02/2014 15:55:03,228 coreaudiod[511]: +PerformDeviceConfigurationChange
28/02/2014 15:55:03,228 coreaudiod[511]: +StartIO
28/02/2014 15:55:03,987 coreaudiod[511]: -PerformDeviceConfigurationChange
28/02/2014 15:55:04,013 coreaudiod[511]: -StartIO

shows that the driver returns from PerformDeviceConfigurationChange at 03,987.

I use

           AudioObjectID theDeviceObjectID = GetObjectID();

            CADispatchQueue::GetGlobalSerialQueue().Dispatch(false,	^{

                PtASPlugInPlugIn::Host_RequestDeviceConfigurationChange(theDeviceObjectID, myChangeAction, &mConfigChangeInfo);

});

to request the change.

Eric Gorouben

Le 28 févr. 2014 à 19:08, Jeff Moore <email@hidden> a écrit :

The HAL stops IO, calls PerformDeviceConfigurationChange() and then restarts IO all in a series on the same thread (actually, from the same function in HAL’s implementation to be precise). So it seems like the only way you could get the behavior you are describing is if your driver returns from PerformDeviceConfigurationChange() before the change has actually completed. Could this be the case here?

--

Jeff Moore
Core Audio
Apple

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