what is max_streams used for?

[streamingsystems]

I am looking through the source code and can't seem to figure out what this directive does:

https://github.com/arut/nginx-rtmp-module/wiki/Directives#max_streams

Can someone help shed some light on it?

Is it the total number of inbound and outbound streams connections? I don't think so as there is max_connections that default to off (unlimited).

Thanks!