Use the Google services to identify source language

[stranak]

For text: https://developers.google.com/ml-kit/language/identification/android

For audio I don't know whether it is public, but Google has it working very nicely in the conversation mode in their translation app. So please look whether there is a method for it that you could use. It would enable a future option for a fully automatic conversation mode, just like Google and Apple translation apps have.