CMHeadphoneMotionManager handler not called

App & System Services Hardware
hturan OP
Created Jun ’20
Replies 15
Boosts 0
Views 4.2k
Participants 8
Hi,

Looking to experiment with the new CMHeadphoneMotionManager AirPods Motion API on iOS 14, but I'm facing issues with the CMHeadphoneMotionManager.startDeviceMotionUpdates handler not being called.

After installing the beta on an iPad Pro 11" (2020, iOS 14.0 18A5301v), I connect a pair of AirPod Pros (firmware 2D15, hardware 1.0.0), and run the following MVP reproducible case I'm using to test —

Code Block 
import UIKit
import CoreMotion
class ViewController: UIViewController, CMHeadphoneMotionManagerDelegate
 {
    var motionManager: CMHeadphoneMotionManager!
    override func viewDidLoad() {
        super.viewDidLoad()
        motionManager = CMHeadphoneMotionManager()
        motionManager.delegate = self
        if motionManager.isDeviceMotionAvailable {
            motionManager.startDeviceMotionUpdates(to: OperationQueue.main) { (motion, error) in
                print(error)
                print(motion)
            }
        }
    }
    func headphoneMotionManagerDidConnect(_ manager: CMHeadphoneMotionManager) {
        print("connect")
    }
    func headphoneMotionManagerDidDisconnect(_ manager: CMHeadphoneMotionManager) {
        print("disconnect")
    }
}


isDeviceMotionAvailable returns true, but the handler (and delegate methods) are never called.

Is there a sample project for CMHeadphoneMotionManager? Am I missing something obvious?

Thanks!
Replies  15
Boosts  0
Views  4.2k
Participants  8
hturan OP
Jun ’20
I've updated my Airpod Pros to the latest firmware (released overnight, 2D27), and am still not seeing any motion events fired.
1
lareich OP
Jun ’20
I'm experiencing the same issue on iPhone 11 Pro. My guess is that for Beta 1, this API is just a stub. Looking forward to it working!
2
DZeitman OP
Jul ’20
Same issue! Has anyone got this API to work?
Team Apple: How about marking up non-implemented APIS not as Beta, but (Beta: Feature not currently implemented)
Model: A2084
FW: 2D27
1
DZeitman OP
Jul ’20
CMDeviceMotion has a SensorLocation property...
 public enum SensorLocation : Int {
        case default = 0
        case headphoneLeft = 1
        case headphoneRight = 2

    }

Does this suggest we could use coremotionManager class and specify the sensor to get the raw data?
0
hturan OP
Jul ’20
Just as a heads up, it looks like this API is still not providing data on iOS 14 Beta 2 (18A5319i) and I haven't received any word from Apple (on radar FB7771582) as to whether this is just a stubbed-out API for now.

I'm starting to think we might not get access to this until we get an AirPods firmware update closer to launch. Not sure if iOS is stubbing out these methods, or the AirPods just haven't been updated to provide the data. I imagine that when (or if) spatial audio arrives in the betas, this API will start working.

Super excited to start playing with this when it lands!
0
stupidsmartguy OP
Jul ’20
Ditto. Looking forward to when this API starts working. Hope this doesn’t go the way of AirPower haha...
0
Noopl OP
Jul ’20
I'm having the same problem. isDeviceMotionAvailable() returns true, but isDeviceMotionActive() returns false. Is there something I need to do to make it active? Or, am I waiting for beta 3? Thanks!
0
stupidsmartguy OP
Jul ’20
Anyone finding success in beta 3?
0
hturan OP
Jul ’20
No changes on iOS 14 Beta 3 for me. No update on FB7771582 either, it's still marked as Open.
0
vijay_vvs OP
Aug ’20
Same here. Not working in iOS 14 Beta 3 .
0
mach1studios OP
Aug ’20
any change on Beta 4?
0
vijay_vvs OP
Aug ’20
Any update on this?
0
hturan OP
Sep ’20
As of the latest AirPod Pro firmware (3A283), I'm happy to report this is now working 🙏
0
mach1studios OP
Sep ’20
For anyone interested, basic iOS app example that gets the orientation data of AirPods Pro and transmits it via OSC to any location on LAN: https://github.com/Mach1Studios/M1-AirPodOSC
1
CLPNG OP
Jan ’21
Anyone have any clues on how apple plans to actually process and spatialize audio other than via Dolby Atmos?
0
CMHeadphoneMotionManager handler not called
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