4 // A class dealing with stream output to HTTP.
10 #include <condition_variable>
16 #include <unordered_map>
20 #include <libavutil/rational.h>
23 struct MHD_Connection;
28 // Returns a pair of content and content-type.
29 using EndpointCallback = std::function<std::pair<std::string, std::string>()>;
34 // Should be called before start().
35 void set_header(const std::string &data) {
39 // Should be called before start() (due to threading issues).
44 void add_endpoint(const std::string &url, const EndpointCallback &callback, CORSPolicy cors_policy) {
45 endpoints[url] = Endpoint{ callback, cors_policy };
49 void add_data(const char *buf, size_t size, bool keyframe, int64_t time, AVRational timebase);
50 int64_t get_num_connected_clients() const {
51 return metric_num_connected_clients.load();
55 static int answer_to_connection_thunk(void *cls, MHD_Connection *connection,
56 const char *url, const char *method,
57 const char *version, const char *upload_data,
58 size_t *upload_data_size, void **con_cls);
60 int answer_to_connection(MHD_Connection *connection,
61 const char *url, const char *method,
62 const char *version, const char *upload_data,
63 size_t *upload_data_size, void **con_cls);
65 static void free_stream(void *cls);
74 Stream(HTTPD *parent, Framing framing) : parent(parent), framing(framing) {}
76 static ssize_t reader_callback_thunk(void *cls, uint64_t pos, char *buf, size_t max);
77 ssize_t reader_callback(uint64_t pos, char *buf, size_t max);
84 void add_data(const char *buf, size_t size, DataType data_type, int64_t time, AVRational timebase);
86 HTTPD *get_parent() const { return parent; }
92 std::mutex buffer_mutex;
93 bool should_quit = false; // Under <buffer_mutex>.
94 std::condition_variable has_buffered_data;
95 std::deque<std::string> buffered_data; // Protected by <buffer_mutex>.
96 size_t used_of_buffered_data = 0; // How many bytes of the first element of <buffered_data> that is already used. Protected by <mutex>.
97 size_t seen_keyframe = false;
100 MHD_Daemon *mhd = nullptr;
101 std::mutex streams_mutex;
102 std::set<Stream *> streams; // Not owned.
104 EndpointCallback callback;
105 CORSPolicy cors_policy;
107 std::unordered_map<std::string, Endpoint> endpoints;
111 std::atomic<int64_t> metric_num_connected_clients{0};
114 #endif // !defined(_HTTPD_H)