I don't have it handy, but the thing I was testing to see if I could change the kAudioUnitProperty_ElementCount after it was initialized, I was able to update the property while audio was being produced. Maybe try initializing first. Also, I wasn't using an AUGraph, not sure if that changes anything.
Dave On Mon, Mar 7, 2016 at 1:03 PM, Marcelo Birnbach <[email protected]> wrote: > 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]> > 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 >> >> >> >> >> >> _______________________________________________ >> Do not post admin requests to the list. They will be ignored. >> Coreaudio-api mailing list ([email protected]) >> Help/Unsubscribe/Update your Subscription: >> >> https://lists.apple.com/mailman/options/coreaudio-api/oneill707%40gmail.com >> >> This email sent to [email protected] >> > >
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