AudioLoopback

A userspace macOS audio loopback driver.

It's derived from Kyle Neideck's BackgroundMusic app

Build:

# make sure your signing cert is configured in the project (a Developer ID, not your personal Apple Developer certificate)

BUNDLE_ID=com.acme.AudioDriver DEVICE_NAME="Audio Loopback" DEVICE_MANUFACTURER_NAME="ACME Inc" make

Installation:

sudo rsync -Pav -EH  build/Products/Debug/RDCAudio.driver/ /Library/Audio/Plug-Ins/HAL/RDCAudio.driver/ # a simple cp breaks extended attributes
sudo pkill -9 coreaudiod

Notarization is required to install on other Macs. With your Apple ID password stored as AC_PASSWORD in the Keychain:

APPLE_ID=john.doe@gmail.com make notarize

Wait for a confirmation e-mail from Apple and:

make staple