proc av_encryption_info_add_side_data(info: ptr AVEncryptionInfo;
                                      side_data_size: ptr csize_t): ptr uint8 {.
    importc, cdecl, ...raises: [], tags: [], forbids: [].}

proc av_encryption_info_alloc(subsample_count, key_id_size, iv_size: cuint): AVEncryptionInfo {.
    importc, cdecl, ...raises: [], tags: [], forbids: [].}

proc av_encryption_info_clone(info: ptr AVEncryptionInfo): ptr AVEncryptionInfo {.
    importc, cdecl, ...raises: [], tags: [], forbids: [].}

proc av_encryption_info_free(info: ptr AVEncryptionInfo) {.importc, cdecl,
    ...raises: [], tags: [], forbids: [].}

proc av_encryption_info_get_side_data(side_data: ptr uint8;
                                      side_data_size: csize_t): ptr AVEncryptionInfo {.
    importc, cdecl, ...raises: [], tags: [], forbids: [].}

proc av_encryption_init_info_add_side_data(info: ptr AVEncryptionInitInfo;
    side_data_size: ptr csize_t): ptr uint8 {.importc, cdecl, ...raises: [],
    tags: [], forbids: [].}

proc av_encryption_init_info_alloc(system_id_size, num_key_ids, key_id_size,
                                   data_size: uint32): AVEncryptionInitInfo {.
    importc, cdecl, ...raises: [], tags: [], forbids: [].}

proc av_encryption_init_info_free(info: ptr AVEncryptionInitInfo) {.importc,
    cdecl, ...raises: [], tags: [], forbids: [].}

proc av_encryption_init_info_get_side_data(side_data: ptr uint8;
    side_daata_size: csize_t): ptr AVEncryptionInitInfo {.importc, cdecl,
    ...raises: [], tags: [], forbids: [].}