Re: unable to change volumes of mixer inputs? (iOS)
Re: unable to change volumes of mixer inputs? (iOS)
- Subject: Re: unable to change volumes of mixer inputs? (iOS)
- From: Bob Sabiston <email@hidden>
- Date: Mon, 31 Dec 2012 10:06:25 -0600
I call the following to change the vol. This maybe called because either the
user pressed the hardware vol button or moved a UISlider
status = AudioUnitSetParameter(multiChannelMixerAU,
kMultiChannelMixerParam_Volume,
kAudioUnitScope_Output, 0, value, 0);
Yes but is that not the control for the *entire* volume? I am trying to
control the volume of the inputs -- like, I have one laser sound that I only
want to play at half volume, another time I might want one character's noise
to increase while others don't that sort of thing.
Bob
Message: 3
Date: Sat, 29 Dec 2012 12:31:53 -0800
From: Andy Davidson <email@hidden>
To: Bob Sabiston <email@hidden>
Cc: "email@hidden Apple"
<email@hidden>
Subject: Re: also: unable to change volumes of mixer inputs? (iOS)
Message-ID: <CD049180.10962%email@hidden>
Content-Type: text/plain; charset="iso-8859-1"
Hi Bob
You are correct my code controls the vol of the output of the mixer. I am
very interested in your question. At some point in time I need to figure out
how to split stereo into separate channels and want to control the vol of
each channel separately. I have not had time to write the test code for this
feature
I found your original post
OSStatus result = AudioUnitSetParameter (mixerUnit,
kMultiChannelMixerParam_Volume,
kAudioUnitScope_Input,
inputBus,
newGain,
0
);
Is the scope correct? You use input, my example uses output?
Andy
It is supposed to be input if you want to change the input volume levels. That old sample code MixerHost was able to do it, but the same thing does not seem to work in my code. I am not sure what the problem could be, though. I wasn't able to get MixerHost to compile and run on my newer devices however. Anyone know what I might be doing wrong?
Thanks Bob
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