Hello, It may have to do something with the property listener. Have you tried using AVAudioSession.routeChangeNotification instead? Did you connect more than 8 AUMIDISynth to your mixer? (IIRC 8 is the maximum possible, at least with AVAudioMixerNode)
In any case it is hard to tell without seeing code. I recommend to set up a minimal test project with only 1 AUMIDISynth. Have you considered using AVFoundation classes instead of the old V2 API? (at least to reproduce the problem) Best regards, Sven > Am 09.07.2018 um 21:32 schrieb Bartosz Nowotny <[email protected]>: > > Hello, > > I am trying to programmatically reconfigure AUGraph at runtime, in response > to a route change. > > My set up consists of a couple of AUMIDISynth nodes connected to a multi > channel mixer node which in turn is connected to RemoteIO node. This set up > works fine and I am able to produce audio by sending MIDI note on/off events. > > I want to avoid audio data resampling at any point in the graph. I can start > with a properly set up AUGraph that has all audio units use the same sample > rate (starting from midi synths, through mixer to remote IO). Route changes > (e.g. plugging in headphones) can change the output sample rate and thus > introduce resampling and other side effects. > > To respond to a route change I set up a property listener for StreamFormat on > my IO unit. When the stream format changes, I call a method that reconfigures > the AUGraph in the following manner: > 1. Stop the AUGraph > 2. Uninitialize the AUGraph > 3. Clear all graph connections > 4. Set mixer output sample rate (propagates to IO input sample rate) > 5. Set synth output sample rates (propagates to mixer input sample rates) > 6. Connect synth nodes to mixer node > 7. Connect mixer node to IO node > 8. Update, Initialize and Start the AUGraph > > None of the above operations returns an error result. > > The issue occurs when I send some note on/off events - the app crashes. What > am I missing? > > Regards, > Bartosz Nowotny > _______________________________________________ > 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/biochill%40me.com > > This email sent to [email protected] _______________________________________________ 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/archive%40mail-archive.com This email sent to [email protected]
