> On Jan 8, 2022, at 12:03 AM, Sampo Syreeni <de...@iki.fi> wrote:
> 
> On 2022-01-04, Hugh Pyle wrote:
> 
>> Is there a simple process for listening to FOA Ambisonic recordings on 
>> AirPods, with head tracking?
> 
> More interestingly, is there some low latency API which lets you 1) get the 
> current orientation of the phones and 2) in real time feed them something 
> better than Apple does?

Yes (and mentioned in greater detail in this thread earlier), you can use 
Apple’s own CMHeadphoneMotionManager API 
<https://developer.apple.com/documentation/coremotion/cmheadphonemotionmanager> 
to get the orientation from the IMU enabled Apple devices with the lowest 
latency possible, from there you can use that with any audio solution you want. 
For example you can use it with our iOS SDK 
<https://github.com/Mach1Studios/Pod-Mach1SpatialAPI> to apply headtracking 
data to any spatial sound or surround multichannel format and not just FOA for 
an example of the most direct usage 
<https://github.com/Mach1Studios/Pod-Mach1SpatialAPI/tree/master/Examples/mach1-transcode-example>
 and lowest latency design you can achieve. You can also just use the iOS app 
to receive the orientation and then transmit that data to whatever host device 
you want by using something similar to OSC and here is an open source example 
<https://github.com/Mach1Studios/M1-AirPodOSC> of that as well.

You have some options due to Apple exposing this on SDK side unlike several 
other IMU enabled headphone manufacturers, 
<https://research.mach1.tech/posts/imu-enabled-devices/> however it should be 
noted you can only access this data on their iOS SDK 
<https://research.mach1.tech/posts/feedback-on-apple-spatial-audio/> which is 
the biggest limitation currently. 

Best,
Dylan

      340.29 m / s
      
      Dylan Marcus
      Technical Director
      A Sound Technology Company.
      New York New York
      The United States of America.
      www.mach1.tech <http://www.mach1.tech/>

      Defenders of the Audio Realm™


> -- 
> Sampo Syreeni, aka decoy - de...@iki.fi, http://decoy.iki.fi/front
> +358-40-3751464, 025E D175 ABE5 027C 9494 EEB0 E090 8BA9 0509 85C2
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