The Sound Description Interchange Format (SDIF) is an established standard for the interchange of sound descriptions and analysis data. This project provides libraries, SDIF (in C) and Easdif (in C++), tools, and wrappers to read and write SDIF files.

sourceforge.net/projects/sdif
cnmat.berkeley.edu/library/sdif
en.wikipedia.org/wiki/SDIF
groups.google.com/g/sdif-forum