Apple

On Apr 23, 2009, at 12:16 AM, Andrew Nalband wrote:

Hi Bill,

After several failed attempts to type this into an e-mail, here's a description:

http://pastie.org/455533

On Apr 22, 2009, at 8:10 PM, William Stewart wrote:

Hi Andrew

On Apr 22, 2009, at 1:56 AM, Andrew Nalband wrote:

Hi Bill,

Thanks for the quick response.

Is it correct that I can use:

kMultiChannelMixerParam_PreAveragePower

for level metering? What range of values will I be reading from it? 0.0 to 1.0?

I followed your advice on checking for an error with this code:

UInt32 meteringMode = 1;
setupErr = AudioUnitSetProperty(mixerUnit, kAudioUnitProperty_MeteringMode, kAudioUnitScope_Input, 0, &meteringMode, sizeof(meteringMode) );
[self throwIfErr:setupErr withMessage:@"Couldn't turn on metering"];

and I am indeed getting an error:

exception: Couldn't turn on metering (OSStatus: -10879 [Å’ˇˇ])

I don't see how this could return that error - are you sure you are doing this on the mixer audio unit? How did you open this?

Bill

References:
	>Audio Unit level metering oniPhone (From: Andrew Nalband <email@hidden>)
	>Re: Audio Unit level metering oniPhone (From: William Stewart <email@hidden>)
	>Re: Audio Unit level metering oniPhone (From: Andrew Nalband <email@hidden>)
	>Re: Audio Unit level metering oniPhone (From: William Stewart <email@hidden>)
	>Re: Audio Unit level metering oniPhone (From: Andrew Nalband <email@hidden>)