C++20 Audio Filter Library

Audio biquad filter library that is based on DSP-Cpp-filters.

As the original repository does not seem to be maintained, I created this fork. It contains the following upgrades compared to the original repo:

• Upgrade to cpp20
  • This includes constexpr, std::numbers and other modern language features
• Implement consistent use of floating point types throughout the code
• Reformat all files via clang-format
• Add some unit integration tests (only for some filters)
• Add CI job for github actions
• Fix for SO_APF Link to issue