I haven't done anything with Widevine , but I have written multiple BMFF parsers, and I'm intimately familiar with how many different boxes/atoms there are. Lu

I haven't done anything with Widevine , but I have written multiple BMFF parsers, and I'm intimately familiar with how many different boxes/atoms there are. Luckily you can implement them incrementally because the box hierarchy is so normalized. It's actually my go-to project when I'm trying to learn a new language, because the problem itself is simple enough to understand, but it forces you to learn the idioms about the language you're learning. What is the idiomatic way to represent different box types? How do you read values with specific endianness from a buffer? How do you seek through a file's contents without loading the whole 10GB movie into memory?