Hi Dave,
Thanks for your response. We call that API before connecting anything to the
mixer:
err = AudioUnitSetProperty(mMixer, kAudioUnitProperty_ElementCount,
kAudioUnitScope_Input, 0, &numbuses, sizeof(numbuses));
if (err) {
NSLog(@"Error - initializeAUGraph - AudioUnitSetProperty -
kAudioUnitProperty_ElementCount - error:%d", err);
return false;
}
We are compiling with target SDK 10.6 (I'm not sure that makes any difference
but we need backward compatibility).
It's interesting you mentioned you've used it with 100 for a test and that
worked. Do you happen to have that test handy so I can give it a try?
Thanks
Marcelo
________________________________
From: Dave O'Neill <[email protected]>
Sent: Monday, March 7, 2016 3:43 PM
To: Marcelo Birnbach
Cc: [email protected]
Subject: Re: kAudioUnitType_Mixer limit?
For kAudioUnitSubType_MultiChannelMixer you have to set the channel count
before using any more than eight. I've used 100 for a test and it was smooth
sailing.
UInt32 channelCount = 16;
AudioUnitSetProperty(mixerUnit , kAudioUnitProperty_ElementCount,
kAudioUnitScope_Input, 0, &channelCount, sizeof(channelCount));
On Mon, Mar 7, 2016 at 12:31 PM, Marcelo Birnbach
<[email protected]<mailto:[email protected]>> wrote:
Hi all,
I wonder if there's any limit to the number of input buses a
kAudioUnitType_Mixer can use. I empirically found that buses higher than ~8 are
discarded. That means that I can mix up to 7 inputs but the 8th and higher are
silent in the output mix.
I tried with kAudioUnitSubType_MultiChannelMixer, kAudioUnitSubType_StereoMixer
and kAudioUnitSubType_3DMixer sub-types. All input buses are set to mono
44100hz and the mixer output is stereo.
I got the same behavior regardless whether I connected other nodes to the mixer
input buses or using render input callbacks.
We are calling setting setting the kAudioUnitProperty_ElementCount property
with the right value (e.g. 11 buses).
Does anyone have an idea of what's going on? I was thinking about using N
number of mixers and connecting them to a master mix but that sounds like a
hack to me and I'd love to understand what's going on first.
Thanks
Marcelo
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