media-libs/
libxtract

A simple, portable, lightweight library of audio feature extraction functions

https://github.com/jamiebullock/LibXtract

There are no pull requests

You think something is missing here?
Start with filling a new pull requests.

If you also like to help the Gentoo project, you can consider sending a Pull Request via GitHub.
Before doing so, you might want to take a look at the wiki page.