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

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

proc av_camellia_init(ctx: ptr AVCAMELLIA; key: ptr uint8; key_bits: cint): cint {.
    importc, cdecl, ...raises: [], tags: [], forbids: [].}