But what does it mean for future ?
1. no patch for LE is possible
2. it is a matter of patching "rk3399-rock-pi-4.dtb"
3. it is not hardware possible
Please comment - this functionality is really awaited for as it changes sound experience vastly nowadays.
It is hardware possible.
A LibreELEC developer just has to add a working patch for Rockchip devices, test it and build a new image.
Eg. for Allwinner devices these patches add audio passthrough - Allwinner: WIP audio passthrough · jernejsk/[email protected] · GitHub
So something similar with a few changes could work on Rockchip devices too.
But they first want to improve video playback I heard so audio passthough will likely take the back seat for another couple of months unless independent developers can do tests and create a patch.