It's the same process but, like you say, the other way around. To stream something to your phone, you need the origin to act as a server (DLNA or UPNP) and your phone to act as a client. To do it in reverse, the same applies: Make your phone act as a server. Just look for "Media Server" in Google Play and you'll find a plethora of apps, both free and paid, that can let you do this. Then you'll need the client counterpart in your PC to make the magic happen.