In other words:

Is there a way to get access to the orientation data of the Airpods?

And in which format are these? Cardan angles? (yaw, pitch, roll)

Quaternions?

“Is there a simple process for listening to FOA Ambisonic recordings on

AirPods, with head tracking?”

The question is of course of general interest.

I suppose that Apple currently does not give some easy access to the iPod 3DoF orientation data. But actually, why not?

Best,

Stefan

P.S.: It is of course possible (and very likely “utterly legal”) to hack this device. Because you have bought it. (Otherwise Apple would pretend that some headtracker sensor functions of their head-/earphones would be “copy-protected”, or alike. This seems to be a nonsense idea, right from the start. Trade secrets?  But why are you then selling a product in the first place?   It is your risc if < your >  customer discovers how  your product is functioning, even outside the limited world of iOS... 

 So I suppose the Airpods should send some position data over the BT5 interface, from time to time. So you have to check the data coming from the AirPods, not from the iPhone/iPad. Are any talented "makers" lurking on this list?  ) 

P.S. 2: What is pretty clear is that Apple < does not tell you > how to read out some headtracking sensor data.  

A different story is to get access to the position/orientation data of an iPhone/iPad itself, which should be supported by the OS. (Don’t check this now.

For Android:

https://developer.android.com/guide/topics/sensors/sensors_position

)

----- Mensagem de Hugh Pyle <[email protected]> ---------

Data: Tue, 4 Jan 2022 08:19:42 -0500

De: Hugh Pyle <[email protected]>

Assunto: [Sursound] Ambisonics with AirPods head tracking

Para: Surround Sound discussion group <[email protected]>

Hi sursounders,

I've been away from the Apple audio ecosystem for a long while.  But now I

have some Airpods, and their head-tracked / spatialization functions are

interesting.

Is there a simple process for listening to FOA Ambisonic recordings on

AirPods, with head tracking?  I have a number of recordings from TetraMic

and H3-VR that I'd like to render for immersive headphone playback, with

head-tracked rotation.  Ideally an audio-only production workflow that

doesn't involve expensive proprietary tools.  But it's OK if the best

answer involves publishing to YouTube or embedding the Ambisonic stream in

some other video format.

Thanks for any suggestions -

Hugh

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