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Re: AudioObjectPropertyAddress confusion

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Re: AudioObjectPropertyAddress confusion

Subject: Re: AudioObjectPropertyAddress confusion
From: Alex Weiss <email@hidden>
Date: Fri, 27 May 2011 22:18:14 +0200

Thanks Stephen, that works. But my question was more general: so far, I've blindly supplied kAudioObjectPropertyScopeGlobal and kAudioObjectPropertyElementMaster whenever I wanted to get or set a property. I was wondering what exactly the scope and element fields mean, and in which cases I would use different parameters.

Best,

Alex

P.S. Great job on Max, I use it very frequently.

On Fri, May 27, 2011 at 6:58 PM, Stephen F. Booth <email@hidden> wrote:

Hi Alex,

Try this:

AudioObjectPropertyAddress propertyAddress = {
kAudioDevicePropertyNominalSampleRate,
kAudioObjectPropertyScopeGlobal,
kAudioObjectPropertyElementMaster
};

OSStatus result = AudioObjectSetPropertyData(outputDeviceID,
&propertyAddress,
0,
NULL,
sizeof(deviceSampleRate),
&deviceSampleRate);

Stephen

On Fri, May 27, 2011 at 12:01 PM, Alex Weiss <email@hidden> wrote:
> Hi,
> I'm changing some of my code to use AudioObjectSetPropertyData /
> AudioObjectGetPropertyData. However, I'm still confused about
> AudioObjectPropertyAddress; the meaning of mSelector is clear, but I still
> don't understand the scope and element fields. The documentation lists the
> possible values, but doesn't really explain when or how they are used. For
> example, if I want to change the sampling rate of my device (i.e.
> kAudioDevicePropertyNominalSampleRate), which scope and element am I
> supposed to indicate?
> Thanks,
> Alex

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References:
	>AudioObjectPropertyAddress confusion (From: Alex Weiss <email@hidden>)

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