That branch also has a happy build system, but it is not api compatible, as I’ve done a bit of restructuring so that it makes more sense.

===============================
if​ (ssyy <= 0.0f + EPSILON) {
*r = 1.0f;
}

/*
b = ssxy / ssxx;
a = avy – b * avx;
*/
rsq = (ssxy * ssxy) / (ssxx * ssyy);

/*
It seems that rsq ^ 0.25 follows roughly
a normal distribution, so thats our preferred
way of looking at things
*/

*r = (float)sqrt(sqrt(rsq));
===============================

In the case where ssyy == 0, it sets *r. However, it then continues and uses ssyy as a divisor(!), and also sets *r to another value. Bug? Feature? You decide.

I have some audio streams that hit this snag. It’s not too uncommon.

"AutoTag" found with the original libfooid, installs a tool called FooID.exe which is a simple command-line program to get the fingerprint of wav files. It makes me wonder if it suffers any issues because of this, or if it’s using some unreleased code.