Difference between audio_device_mac and audio_device_mac_orig

[Pradeep Chakravarti]

Hey All,
I was wondering why there are different files audio_device_mac.cc and audio_device_mac_orig.cc. There is same for the header files. This is in src/modules/audio_device/mac/

When are they used or called one vs the other? I can't find any build scripts that reference the difference.

Thanks,
Pradeep