Short feature/function description
Metadata is currently hardcoded, but I would like to read metadata from the input file and send that to the receiver. I found a simple library that should do the trick:

https://github.com/thebigmunch/audio-metadata

I will have to play around with it a bit to see how it works. Seems to support the same formats as miniaudio, so that's a big plus. For flexibility, I sill want to allow custom metadata. So I will support that as well.

What needs to be done?

• Play around with library to see how it works
• Add flag read_metadata (default to True)
• Read and set metadata if flag is True
• Update documentation

Is this a breaking change?
No

Anything else worth knowing?
Relates to #1059

I will take care of custom metadata in a separate issue.