This project adds the following decoder:

MP3;

AAC (ADTS and MP4 containers) (HE-AAC cannot be decoded normally);

Flac.

It should be noted that this does not mean that you can use other formats in Sounds.json. Minecraft has hard -coded all sounds into OGG formats.

The module contains some Jlayer (Libgdx Fork, the link has been invalid), Java Advanced Audio Decoder (Jaad) and JustFlac Library.