ERROR[OpenTok]:Audio device error: startCapture.AudioOutputUnitStart returned error: -66637

[khushbooOpenxcell]

I have implemented OpenTok with CallKit. Whenever I start outgoing call, my stream is never published. At the inspector dashboard it says,

Attempting to publish with stream 54B02465-0E26-4AF0-8715-9D333BF6E9FC (has not started publishing to session yet)

it never succeed in publishing.

Moreover, I get the error in the log:

ERROR[OpenTok]:Audio device error: startCapture.AudioOutputUnitStart returned error: -66637

Is the error in publishing because of this error?

I have added OTDefaultAudioDevice file from the demo provided on GitHub.

Below is my code:

` func provider(_ provider: CXProvider, perform action: CXStartCallAction) { // Create & configure an instance of SpeakerboxCall, the app's model class representing the new outgoing call. let call = SpeakerboxCall(uuid: action.callUUID, isOutgoing: true) call.handle = action.handle.value

    /*
        Configure the audio session, but do not start call audio here, since it must be done once
        the audio session has been activated by the system after having its priority elevated.
     */
    // https://forums.developer.apple.com/thread/64544
    // we can't configure the audio session here for the case of launching it from locked screen
    // instead, we have to pre-heat the AVAudioSession by configuring as early as possible, didActivate do not get called otherwise
    // please look for  * pre-heat the AVAudioSession *
    configureAudioSession()
    
    /*
        Set callback blocks for significant events in the call's lifecycle, so that the CXProvider may be updated
        to reflect the updated state.
     */
    call.hasStartedConnectingDidChange = {
        provider.reportOutgoingCall(with: call.uuid, startedConnectingAt: call.connectingDate)
    }
    call.hasConnectedDidChange = {
        provider.reportOutgoingCall(with: call.uuid, connectedAt: call.connectDate)
    }

    self.outgoingCall = call
    
    // Signal to the system that the action has been successfully performed.
    action.fulfill()
}

func provider(_ provider: CXProvider, didActivate audioSession: AVAudioSession) { print("Received (#function)")

    // If we are returning from a hold state
    if answerCall?.hasConnected ?? false {
        //configureAudioSession()
        // See more details on how this works in the OTDefaultAudioDevice.m method handleInterruptionEvent
        sendFakeAudioInterruptionNotificationToStartAudioResources();
        return
    }
    
    if outgoingCall?.hasConnected ?? false {
        //configureAudioSession()
        // See more details on how this works in the OTDefaultAudioDevice.m method handleInterruptionEvent
        sendFakeAudioInterruptionNotificationToStartAudioResources()
        return
    }
    
    if outgoingCall != nil{
        startCall(withAudioSession: audioSession) { success in
            if success {
                self.outgoingCall?.hasConnected = true
                self.addCall(self.outgoingCall!)
                self.startAudio()
            }
        }
    }
    
    if answerCall != nil{
        answerCall(withAudioSession: audioSession) { success in
            if success {
                self.answerCall?.hasConnected = true
                self.startAudio()
            }
        }
    }
    
}

func sendFakeAudioInterruptionNotificationToStartAudioResources() { var userInfo = Dictionary<AnyHashable, Any>() let interrupttioEndedRaw = AVAudioSession.InterruptionType.ended.rawValue userInfo[AVAudioSessionInterruptionTypeKey] = interrupttioEndedRaw NotificationCenter.default.post(name: AVAudioSession.interruptionNotification, object: self, userInfo: userInfo) }

func configureAudioSession() { // See https://forums.developer.apple.com/thread/64544 let session = AVAudioSession.sharedInstance() do { try session.setCategory(AVAudioSession.Category.playAndRecord, mode: .default) try session.setActive(true) try session.setMode(AVAudioSession.Mode.voiceChat) try session.setPreferredSampleRate(44100.0) try session.setPreferredIOBufferDuration(0.005) } catch { print(#file) print(#function) print(error) } } `

When I remove the dependency on OTDefaultAudioDevice, things fall correctly, but without audio.

I have referred following:

• https://github.com/opentok/CallKit

• https://github.com/opentok/opentok-ios-sdk-samples-swift

[Jeremias-Pellegrino]

Same problem here BUT it only happens when app is in background! Hope it can be solved soon :)