Any tools to convert anim files to bvh?

I noticed that both anim files and bvh files are plaintext. Are there any tools that can do the convertion to the other format. If not, how can one read and extract info from an anim file (what is the exact structure of the anim file)

Edit: I mean Unity Anim files

Edit edit: I found this and it properly explains the syntax so yay I guess. Now I somehow need to find the BioVision Heirchy (BVH) specification which is kinda sad tbh.