extern std::vector<std::string> split_at_spaces_considering_quotes (std::string);
extern std::string md5_digest (std::string);
extern std::string md5_digest (void const *, int);
extern void ensure_ui_thread ();
extern std::string audio_channel_name (int);
extern std::vector<std::string> split_at_spaces_considering_quotes (std::string);
extern std::string md5_digest (std::string);
extern std::string md5_digest (void const *, int);
extern void ensure_ui_thread ();
extern std::string audio_channel_name (int);