Why aren't the input parameters const?

[iboB]

All inputs in the interface are pointers to non-const buffers. Why is that? Can the values be touched?

This makes it somewhat unpleasant to integrate in system where the buffers come from the outside world as const.

[DiamonDinoia]

Because of some legacy decisions in the early stages of development. We are moving to more standard compliant codebase, c++ friendly. PR #647 fixes it but we did not have time to review and integrate it yet. It will happen soon. Version 2.5 will have this. Minor versions before 2.5 (if any) might not.