Re: Controlling custom parameters of AUAudioUnit subclass when instantiated via AudioComponentInstanceNew
Re: Controlling custom parameters of AUAudioUnit subclass when instantiated via AudioComponentInstanceNew
- Subject: Re: Controlling custom parameters of AUAudioUnit subclass when instantiated via AudioComponentInstanceNew
- From: Pavol Markovic via Coreaudio-api <email@hidden>
- Date: Thu, 9 Jul 2020 22:15:44 +1200
Hi Ariel,
You should be able to get and set parameter value through AudioUnitGetParameter
/ AudioUnitSetParameter functions
https://developer.apple.com/documentation/audiotoolbox/1440055-audiounitgetparameter
https://developer.apple.com/documentation/audiotoolbox/1438454-audiounitsetparameter
> On 2 Jul 2020, at 04:18, Ariel Elkin via Coreaudio-api
> <email@hidden> wrote:
>
> Hello folks,
>
> I have an AUAudioUnit subclass which I'm using to process the audio played
> back by an AVPlayer instance.
>
> The approach is to create a MTAudioProcessingTapRef, make the audio unit
> render within its MTAudioProcessingTapProcessCallback, and assign that tap as
> the tapProcessor property of the AVMutableAudioMix of a AVPlayerItem. This is
> pretty much Apple's reference implementation here:
> https://developer.apple.com/documentation/avfoundation/avaudiomixinputparameters/1388578-audiotapprocessor
>
> <https://developer.apple.com/documentation/avfoundation/avaudiomixinputparameters/1388578-audiotapprocessor>
>
> The tap works as intended, and the AVPlayer's audio flows through my audio
> unit's render callback. However, I initialise my audio unit with
> AudioComponentInstanceNew, so it's of type AudioUnit, so it can't seemingly
> expose the AUParameters properties it has as an AUAudioUnit.
>
> Does anyone have any ideas as to how I can control custom parameters of
> AUAudioUnit subclasses that are instantiated via AudioComponentInstanceNew?
>
> Thanks
>
> Ariel
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