Procs

proc av_file_map(filename: cstring; bufptr: ptr ptr uint8; size: ptr csize_t;
                 log_offset: cint; log_ctx: pointer): cint {.importc, cdecl,
    ...raises: [], tags: [], forbids: [].}

proc av_file_unmap(bufptr: ptr uint8; size: csize_t) {.importc, cdecl,
    ...raises: [], tags: [], forbids: [].}

proc av_tempfile(prefix: cstring; filename: cstringArray; log_offset: cuint;
                 log_ctx: pointer): cint {.importc, cdecl, ...raises: [], tags: [],
    forbids: [].}