I started a new iOS application, where I am hosting a AUv3 Plugin, which I created via an AudioUnit Extension. I am basically using the template, which Apple has provided me with. My main application is hosting the AUv3. The following code works on my device ( iPad Pro 11 - iOS 14 ) but in the simulator ( iPhone 11 - iOS 14 ) I get the following error message:
2020-10-15 21:07:36.786306+0200 MyApp[2132:84039] [plugin] AddInstanceForFactory: No factory registered for id <CFUUID 0x600001d074c0> F8BB1C28-BAE8-11D6-9C31-00039315CD46
2020-10-15 21:07:37.124600+0200 MyApp[2132:83972] EXCEPTION: os_eventlink_activate failed (45)
2020-10-15 21:07:37.125009+0200 MyApp[2132:83972] [i-aa] AUAudioUnit_XPC.mm:665:-[AUAudioUnit_XPC allocateRenderResourcesAndReturnError:]: render pipe user creation failure (Error Domain=NSOSStatusErrorDomain Code=-1 "(null)")
2020-10-15 21:07:37.125389+0200 MyApp[2132:83972] [avae]
AVAEInternal.h:109 [AVAudioEngineGraph.mm:1389:Initialize: (err = AUGraphParser::InitializeActiveNodesInOutputChain(ThisGraph, kOutputChainOptimizedTraversal, *GetOutputNode(), isOutputChainActive)): error -1 ERROR: The operation couldn’t be completed. (com.apple.coreaudio.avfaudio error -1.)
ViewController.swift
import UIKit
import AVFoundation
import CoreAudioKit
class ViewController: UIViewController {
@IBOutlet weak var auView: UIView!
var avUnit:AVAudioUnit?
var engine:AVAudioEngine!
override func viewDidLoad() {
super.viewDidLoad()
self.engine = AVAudioEngine()
do {
try AVAudioSession.sharedInstance().setMode(.default)
try AVAudioSession.sharedInstance().setPreferredSampleRate(44100)
try AVAudioSession.sharedInstance().setCategory(.playback, options: [.allowBluetooth, .allowBluetoothA2DP, .mixWithOthers])
try AVAudioSession.sharedInstance().setActive(true)
}catch let error{
print("error \(error.localizedDescription)")
}
// Retrieve audio unit components by description.
let description = AudioComponentDescription(componentType: kAudioUnitType_MusicDevice,
componentSubType: 0x6775616e,
componentManufacturer: 0x5775616e,
componentFlags: 0,
componentFlagsMask: 0)
AVAudioUnit.instantiate(with: description, options: []) { avAudioUnit, error in
guard error == nil else {
DispatchQueue.main.async { /* Show error message to user. */ }
return
}
guard let aUnit = avAudioUnit else { return }
self.avUnit = aUnit
//let format = AVAudioFormat(commonFormat: .pcmFormatFloat32, sampleRate: 44100, channels: 2, interleaved: false)!
let formatOutput = self.engine.mainMixerNode.outputFormat(forBus: 0)
let formatAU = aUnit.outputFormat(forBus: 0)
self.engine.attach(aUnit)
self.engine.connect(aUnit, to: self.engine.mainMixerNode, format: formatAU)
self.engine.connect(self.engine.mainMixerNode, to: self.engine.outputNode, format: formatOutput)
do {
try self.engine.start()
} catch let error {
print(error.localizedDescription)
}
self.addPluginView()
}
}
private func addPluginView() {
self.avUnit?.auAudioUnit.requestViewController(completionHandler: { plugInViewController in
if plugInViewController != nil{
if let pluginView = plugInViewController!.view{
pluginView.frame = self.auView.bounds
self.auView.addSubview(pluginView)
}
}
})
}
}
Is it a problem inside the AVAudioEngine..? Any help highly appreciated.
