Real Life delivery formats
44.1/48 kHz @ 16/24 bits
Specification of the Broadcast Wave Format (BWF) - EBU
RF64: An Extended File Format for Audio - EBU
Standard Mixing Levels for Movie Theater, DVD, TV, Internet, Radio and Games
There is no 100% certain way to determine which equal-tempered scale standard was used as tuning basis for a song. However the vast majority is A440. Many electronic instruments don't really give you any choice.
However you ask how to determine it. You'll need to do a spectrum analysis and sum up the energy around the fundamental frequencies of the scales. ...