Re: More AUMixer Metering Questions...
Re: More AUMixer Metering Questions...
- Subject: Re: More AUMixer Metering Questions...
- From: William Stewart <email@hidden>
- Date: Mon, 30 Oct 2006 19:31:41 -0800
I couldn't find a define in our headers for:
kStereoMixer_PostAveragePower (its kStereoMixerParam_PostAveragePower)
Metering is per-channel, not per-bus. From AudioUnitParameters.h:
// read-only
//
// For each of the following, use the parameter number for the left
channel
// and the parameter number plus one for the right channel.
// For example k3DMixerParam_PostAveragePower is for the left channel
// while k3DMixerParam_PostAveragePower+1 is for the right channel.
kStereoMixerParam_PreAveragePower = 1000,
kStereoMixerParam_PrePeakHoldLevel = 2000,
kStereoMixerParam_PostAveragePower = 3000,
kStereoMixerParam_PostPeakHoldLevel = 4000
(note the 3DMixer param ID's are the same for these cases as the
stereo ones, so the comment above does correctly apply)
So - with the call below you are only ever asking for the left
channel of inputBusIndex0 - to ask for the right channel, the paramID
is (kStereoMixerParam_PostAveragePower+1)
Bill
On 30/10/2006, at 12:04 PM, Mark Coniglio wrote:
Hi All,
I'm using the metering on the AUMixer. I've just discovered that,
given a stereo stream coming into the mixer, when there is signal
on the left channel and not the right, I the metering works as
expected. But when the signal is on the right on not the left,
metering does not work.
I am getting the levels with
float power;
::AudioUnitGetParameter(au, kStereoMixer_PostAveragePower,
kAudioUnit_ScopeInput, inputBusIndex0, &power);
Similarly, you can simply use the pan input to pan the signal all
the way to the right, and then the signal disappears.
I guess this begs another question: can I meter the individual
channels of the AUMixer? Or do I need to switch to a MatrixMixer to
accomplish this?
Thanks,
Mark
--
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Mark Coniglio, Artistic Co-Director | email@hidden
Troika Ranch Dance Theater | http://www.troikaranch.org
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