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Trying to use an AUConverter with an input callback (Leopard 10.5.8)

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Trying to use an AUConverter with an input callback (Leopard 10.5.8)

Subject: Trying to use an AUConverter with an input callback (Leopard 10.5.8)
From: John Sheehy <email@hidden>
Date: Mon, 21 Sep 2009 17:00:46 -0700


Hi all,

I've managed to set up the default AUHAL output unit for input, and can record @ whatever h/w sample rate is at without problems. What I need however is to convert the incoming sample rate to 16Khz. Is there any way I can do this transparently, as in connect the default output unit's input bus to an AUConverter, setting the appropriate stream formats on both sides of the converter ?

Ideally, I would have one callback, inside which I'd call AudioUnitRender, and the audio it would render would have already gone through the converter. Is this possible ? I've tried various combinations of setting render callback with various bus specifications on the input unit and the AUconverter component, but to no avail.

The only examples I've been able to find all end up in an output unit, but as outbound SRC seems to be transparent in Leopard, I haven't needed to worry about that side of things.

I'd really appreciate it if someone could tell me this is definitely possible, and even better point me in the direction of any sample code or tutorial that achieves this..

thanks a lot

John Sheehy. _______________________________________________ Do not post admin requests to the list. They will be ignored. Coreaudio-api mailing list (email@hidden) Help/Unsubscribe/Update your Subscription: This email sent to email@hidden Follow-Ups: Re: Trying to use an AUConverter with an input callback (Leopard 10.5.8) From: Doug Wyatt <email@hidden> Prev by Date: Re: Input buses for multichannel mixer Next by Date: Problem Compiling PublicUtility Classes Previous by thread: Re: Core Audio Clock help Next by thread: Re: Trying to use an AUConverter with an input callback (Leopard 10.5.8) Index(es): Date Thread