Input listener if it is receiving signal!

[KridiRamilli]

• I'm submitting a ...
  [ ] bug report
  [ ] feature request
  [ ] question about the decisions made in the repository
  [x ] question about how to use this project

• Summary
  We're using sofie-atem-connection to control the program input on an Atem so we can have automatic switching when the main PC is not alive( suddenly shuts down).
  Is there a possibility to understand if an input is receiving transmission, maybe through audio levels or i don't know.
  We want to achieve redundancy based on Atem input, so if the main input is not receiving signal we can switch to the next one

• Other information (e.g. detailed explanation, stacktraces, related issues, suggestions how to fix, links for us to have context, eg. StackOverflow, personal fork, etc.)

[Julusian]

I don't have any good ideas on how to achieve this. The atem doesn't provide a way of detecting if there is signal on a particular input. Maybe you can rely on audio levels, once #148 is finished and merged