Hi Eric, Thank you for your quick feedback. I really apologise for having to ask this question, but can you confirm your drivers do actually read input via the core audio API on Mojave, when part of the /usr/sbin/coreaudiod daemon? I ask because this is specifically a Mojave issue, so any driver you wrote that worked in the past may have stopped working since Mojave. I did debug through my driver to find the samples coming out of the core audio api were unexpectedly silent, and did prove the same audio interface does work with a micro-phone-authorisation-enabled app. So the only reason I currently see for the samples received by the driver to be silent, but only on Mojave, is lack of micro-phone usage permission.
Can anyone else confirm Eric’s assertion that this should work without explicit user permission on Mojave? Best Regards, Nicolas > On 22 May 2019, at 10:05, Eric Gorouben <[email protected]> wrote: > > > Hi Nicolas > > As far as I know, it is possible, and there is no necessary workaround. I’ve > written drivers for many devices using this API, and never had this problem. > There is probably another problem in your implementation. > > Good luck > Eric Gorouben > >> Le 22 mai 2019 à 10:51, [email protected] <mailto:[email protected]> a écrit >> : >> >> Hello esteemed colleagues, >> >> Context: Mojave has extra security in place that requires explicit user >> authorisation in order for an app to be allowed to received microphone >> input. If that permission is not present, then all input from *any* audio >> interface device is silenced when the app uses the core audio API to read >> input. In order to enable input, the app needs to use the appropriate >> notarisations or add a NSMicrophoneUsageDescription key to its plist. The >> first time the app is run, the user will then be shown a popup to ask if >> they wish to enable usage of the microphone by that app. That permission >> then gets stored into the permissions database and is resettable by the >> tccutil command line utility. So far so good. >> >> Now consider a user-space HAL-plugin virtual driver based on the >> coreaudio/AudioServerPlugin.h configuration. Since the driver is not a kext, >> it has to use user-space APIs to do anything with audio. But in order to >> read input via core audio api's, it has to have explicit user permission, >> which (as I understand it) is impossible to grant because the coreaudiod is >> forbidden from raising anything GUI or popup related: A Catch-22. >> >> So my question is pretty fundamental: >> >> Is it now impossible to read audio input in a user-space HAL plugin virtual >> driver in Mojave, or is there some hitherto undocumented driver-specific >> work-around that could enable audio input? >> >> If it is impossible by design rather than accident, I would appreciate an >> Apple-insider explaining the context of that design, because this would be a >> pretty fundamental downgrading of the HAL technology. >> >> Best Regards, >> Nicolas Haynes >> >> >> >> >> >> >> >> Sonnox Ltd. Registered in England and Wales, number 05820431 >> Registered Office: >> The Studio, >> Witney Lakes Resort, >> Downs Road, >> Witney. Oxfordshire. OX29 0SY >> >> www.sonnox.com >> <http://www.sonnox.com/>_______________________________________________ >> Do not post admin requests to the list. They will be ignored. >> Coreaudio-api mailing list ([email protected] >> <mailto:[email protected]>) >> Help/Unsubscribe/Update your Subscription: >> https://lists.apple.com/mailman/options/coreaudio-api/gorouben%40gmail.com >> <https://lists.apple.com/mailman/options/coreaudio-api/gorouben%40gmail.com> >> >> This email sent to [email protected] <mailto:[email protected]> > > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Coreaudio-api mailing list ([email protected]) > Help/Unsubscribe/Update your Subscription: > https://lists.apple.com/mailman/options/coreaudio-api/nh%40sonnox.co.uk > > This email sent to [email protected] Sonnox Ltd. Registered in England and Wales, number 05820431 Registered Office: The Studio, Witney Lakes Resort, Downs Road, Witney, Oxfordshire. OX29 0SY http://www.sonnox.com
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