Is there anyway we could get this supported? Specifically pixel 4xl? Savitech also has github source of lhdc. Aptx hd doesn't work on my pixel 4xl also. Thank you for creating this discussion forum as well, will definitely help the community!
LHDC is not part of AOSP. We aren't going to add support. We support all codecs that each respective device supports on the stock OS.
All codecs that work on stock OS work on GrapheneOS.