proc av_tea_alloc(): ptr AVTEA {.importc, cdecl, ...raises: [], tags: [],
                                 forbids: [].}

proc av_tea_crypt(ctx: ptr AVTEA; dst, src: ptr uint8; count: cint;
                  iv: ptr uint8; decrypt: cint) {.importc, cdecl, ...raises: [],
    tags: [], forbids: [].}

proc av_tea_init(ctx: ptr AVTEA; key: ptr uint8; rounds: cint) {.importc, cdecl,
    ...raises: [], tags: [], forbids: [].}