Add Support for long term loudness average measurements

[12xx12]

To complete the audio toolkit an option to average the loudness measured over a longer time interval [1, 5, 15, 30, 60, infinite] minutes might be interesting.

[NexAdn]

I propose a few additions to this:

• allow setting a target loudness value (LUFS), similar to the target trace (more a nice-to-have than a priority)
• show integrated loudness, true peak and loudness range according to EBU R-128

This would make the tool very handy and informative for monitoring loudness in live broadcasts.

[psmokotnin]

Open Sound Meter is more for live sound and I have a lot of functions to implement. Its future is more in acoustics than in broadcasting. So, Leq is already in todo list. Measurement for EBU standard is even another type of measurement and requires another approach and achitecture.

[josh-barker]

Hey @psmokotnin , just wondering when the Leq feature might be coming?

Thanks!

[psmokotnin]

@josh-barker Since it's a very important tool, I hope in the next months.

[psmokotnin]

Done. Will be included in future v1.3

[12xx12]

Thanks !!!!