(Mhl is dedicated for making mirroring).
I do not think S7 has Mhl support.
Micro USB 2.0, USB Type C, Mhl 3.0, OTG.
We know Mhl works, but LED can work better".
We know Mhl works, but LED can work better” coralmagazine-us.
For this you need an HDMI cable, phone campatibil Mhl and Mhl adapter.
Mhl sends pictures as a video stream,
up to 1080p resolution, and is compatible with HDMI.
Samsung has dropped support for Mhl and all other protocols for sending video and audio over USB,
so if you have a newer Samsung smartphone like the Galaxy S6 or Galaxy S6 Edge, you will need to go with a wireless solution like the Chromecast.