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

proc av_aes_ctr_crypt(a: ptr AVAESCTR; dst, src: ptr uint8; size: cint) {.
    importc, cdecl, ...raises: [], tags: [], forbids: [].}

proc av_aes_ctr_free(a: ptr AVAESCTR) {.importc, cdecl, ...raises: [], tags: [],
                                        forbids: [].}

proc av_aes_ctr_get_iv(a: ptr AVAESCTR): ptr uint8 {.importc, cdecl, ...raises: [],
    tags: [], forbids: [].}

proc av_aes_ctr_increment_iv(a: ptr AVAESCTR) {.importc, cdecl, ...raises: [],
    tags: [], forbids: [].}

proc av_aes_ctr_init(a: ptr AVAESCTR; key: ptr uint8): cint {.importc, cdecl,
    ...raises: [], tags: [], forbids: [].}

proc av_aes_ctr_set_full_iv(a: ptr AVAESCTR; iv: ptr uint8) {.importc, cdecl,
    ...raises: [], tags: [], forbids: [].}

proc av_aes_ctr_set_iv(a: ptr AVAESCTR; iv: ptr uint8) {.importc, cdecl,
    ...raises: [], tags: [], forbids: [].}

proc av_aes_ctr_set_random_iv(a: ptr AVAESCTR) {.importc, cdecl, ...raises: [],
    tags: [], forbids: [].}