proc av_default_get_category(ptr: pointer): AVClassCategory {.importc, cdecl,
    ...raises: [], tags: [], forbids: [].}

proc av_default_item_name(ctx: pointer): cstring {.importc, cdecl, ...raises: [],
    tags: [], forbids: [].}

proc av_log(avcl: pointer; level: cint; fmt: cstring) {.varargs, importc, cdecl,
    ...raises: [], tags: [], forbids: [].}

proc av_log_default_callback(avcl: pointer; level: cint; fmt: cchar; vl: va_list) {.
    importc, cdecl, ...raises: [], tags: [], forbids: [].}

proc av_log_format_line(ptr: pointer; level: cint; fmt: cstring; vl: va_list;
                        line: cstring; line_size: cint; print_prefix: ptr cint) {.
    importc, cdecl, ...raises: [], tags: [], forbids: [].}

proc av_log_format_line2(ptr: pointer; level: cint; fmt: cstring; vl: va_list;
                         line: cstring; line_size: cint; print_prefix: ptr cint): cint {.
    importc, cdecl, ...raises: [], tags: [], forbids: [].}

proc av_log_get_flags(): cint {.importc, cdecl, ...raises: [], tags: [],
                                forbids: [].}

proc av_log_get_level(): cint {.importc, cdecl, ...raises: [], tags: [],
                                forbids: [].}

proc av_log_once(avcl: pointer; initial_level, subsequent_level: cint;
                 state: ptr cint; fmt: cstring) {.varargs, importc, cdecl,
    ...raises: [], tags: [], forbids: [].}

proc av_log_set_callback(callback: proc (a1: pointer; a2: cint; a3: cstring;
    a4: va_list)) {.importc, cdecl, ...raises: [], tags: [], forbids: [].}

proc av_log_set_flags(arg: cint) {.importc, cdecl, ...raises: [], tags: [],
                                   forbids: [].}

proc av_log_set_level(level: cint) {.importc, cdecl, ...raises: [], tags: [],
                                     forbids: [].}

proc av_vlog(avcl: pointer; level: cint; fmt: cstring; vl: va_list) {.importc,
    cdecl, ...raises: [], tags: [], forbids: [].}

template AV_IS_INPUT_DEVICE(category: untyped): untyped

template AV_IS_OUTPUT_DEVICE(category: untyped): untyped

template AV_LOG_C(x: untyped): untyped