proc av_md5_alloc(): ptr AVMD5 {.importc, cdecl, ...raises: [], tags: [],
                                 forbids: [].}

proc av_md5_final(ctx: ptr AVMD5; dst: ptr uint8) {.importc, cdecl, ...raises: [],
    tags: [], forbids: [].}

proc av_md5_init(ctx: ptr AVMD5) {.importc, cdecl, ...raises: [], tags: [],
                                   forbids: [].}

proc av_md5_sum(dst, src: ptr uint8; len: csize_t) {.importc, cdecl, ...raises: [],
    tags: [], forbids: [].}

proc av_md5_update(ctx: ptr AVMD5; src: ptr uint8; len: csize_t) {.importc,
    cdecl, ...raises: [], tags: [], forbids: [].}