4 // A class dealing with stream output to HTTP.
10 #include <condition_variable>
16 struct MHD_Connection;
24 // Should be called before start().
25 void set_header(const std::string &data) {
30 void add_data(const char *buf, size_t size, bool keyframe);
31 int64_t get_num_connected_clients() const {
32 return metric_num_connected_clients.load();
36 static int answer_to_connection_thunk(void *cls, MHD_Connection *connection,
37 const char *url, const char *method,
38 const char *version, const char *upload_data,
39 size_t *upload_data_size, void **con_cls);
41 int answer_to_connection(MHD_Connection *connection,
42 const char *url, const char *method,
43 const char *version, const char *upload_data,
44 size_t *upload_data_size, void **con_cls);
46 static void free_stream(void *cls);
55 Stream(HTTPD *parent, Framing framing) : parent(parent), framing(framing) {}
57 static ssize_t reader_callback_thunk(void *cls, uint64_t pos, char *buf, size_t max);
58 ssize_t reader_callback(uint64_t pos, char *buf, size_t max);
65 void add_data(const char *buf, size_t size, DataType data_type);
67 HTTPD *get_parent() const { return parent; }
73 std::mutex buffer_mutex;
74 bool should_quit = false; // Under <buffer_mutex>.
75 std::condition_variable has_buffered_data;
76 std::deque<std::string> buffered_data; // Protected by <buffer_mutex>.
77 size_t used_of_buffered_data = 0; // How many bytes of the first element of <buffered_data> that is already used. Protected by <mutex>.
78 size_t seen_keyframe = false;
81 MHD_Daemon *mhd = nullptr;
82 std::mutex streams_mutex;
83 std::set<Stream *> streams; // Not owned.
87 std::atomic<int64_t> metric_num_connected_clients{0};
90 #endif // !defined(_HTTPD_H)