Re: kStereoMixerParam_PreAveragePower
Re: kStereoMixerParam_PreAveragePower
- Subject: Re: kStereoMixerParam_PreAveragePower
- From: Chris Rogers <email@hidden>
- Date: Mon, 1 Nov 2004 15:29:49 -0800
Title: Re:
kStereoMixerParam_PreAveragePower
Mark,
Sorry this is a bit confusing and isn't really documented in
AudioUnitParameters.h
Set the scope to either kAudioUnitScope_Input or
kAudioUnitScope_Output
(in the input case the element argument determines which input
bus -
for the output case element must equal 0 since there's only one
output bus)
The parameter ID value to use is the one defined in
AudioUnitParameters.h
(kStereoMixerParam_PreAveragePower/kStereoMixerParam_PostAveragePower, etc.)
*plus* the channel number, thus:
kStereoMixerParam_PreAveragePower + 0
// left channel
kStereoMixerParam_PreAveragePower + 1
// right channel
Hope this helps...
Chris Rogers
Core Audio
Apple Computer
Hi Folks,
I'm experimenting with the StereoMixer AU. I have the stereo
mixer
connected to a kAudioUnitSubType_DefaultOutput outputAU. I can
change
volume and pan without any problem. However, I have some
questions:
1) How do I read Left and Right values for the
kStereoMixerParam_PreAveragePower/kStereoMixerParam_PostAveragePower
parameters? When I pass anything other than 0 as the element
parameter to
AudioUnitGetParameter, I get back an kAudioUnitErr_InvalidElement
error.
The value I get back for element 0 appears to be for the left channel
only.
2) How frequently should I be sampling the
kStereoMixerParam_PreAveragePower
paramter. The MatrixMixerTest sample schedules its timer at
0.02s
intervals. When I use this interval, I find that the Average
power levels
I'm getting appear to be out of sync with the music.
Thanks. I'm sorry if these are RTFM questions, but all my
searches came up
empty.
Cheers
-Mark
---------------------------------------------------------------------
Mark
Alldritt Late Night Software Ltd.
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Victoria, B.C.
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