Apparently there is a mirror of qmmp on github, but it is not clear if this is an official thing. Probably not. https://github.com/Greedysky/qmmp
I wonder though if it would be possible to replace ancient SVN by git for qmmp, making it much more easy to work with the source code? Git provides a migration tool (git svn clone) to convert a SVN repository to git, including history.
Just a suggestion, of course.