Does PS4 app stream from PC or over internet?

[alb92]

Not really an issue, but just a question.

If I am using the PS4 app with Connect from my pc or android phone. Assuming I'm a premium member with playlists available offline on those devices, will the PS4 stream over a local connection from the pc, or will it be streaming over internet, with the pc simply being a controller?

Bandwith where I am is marginal at best, and hoping to find a way to use spotify on my ps4, but without it streaming over the internet causing bandwidth issues.