extern void* wrapped_av_malloc (size_t);
extern int64_t divide_with_round (int64_t a, int64_t b);
extern ContentTimePeriod subtitle_period (AVSubtitle const &);
+extern void set_backtrace_file (boost::filesystem::path);
/** @class Socket
* @brief A class to wrap a boost::asio::ip::tcp::socket with some things