The Immersive Audio Model and Formats (IAMF) container specification was announced on Thursday as AOMedia's first audio container specification and like AV1 is available under a royalty-free license.
IAMF aims to enable new immersive audio experiences for a range of applications from AR/VR to traditional broadcasting. IAMF is a codec-agnostic container specification that supports spatial audio for all devices, flexible audio delivery, and is creator-friendly.
More details on the IAMF audio container specification via AOMedia.org . Along with the finalized specification, AOMedia has made available libiamf as a reference software implementation for this container format and some examples such as using IAMF with Opus audio.