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>()>;
40 // Should be called before start().
41 void set_header(StreamType stream_type, const std::string &data) {
42 header[stream_type] = data;
45 // Should be called before start() (due to threading issues).
50 void add_endpoint(const std::string &url, const EndpointCallback &callback, CORSPolicy cors_policy) {
51 endpoints[url] = Endpoint{ callback, cors_policy };
56 void add_data(StreamType stream_type, const char *buf, size_t size, bool keyframe, int64_t time, AVRational timebase);
57 int64_t get_num_connected_clients() const {
58 return metric_num_connected_clients.load();
62 static int answer_to_connection_thunk(void *cls, MHD_Connection *connection,
63 const char *url, const char *method,
64 const char *version, const char *upload_data,
65 size_t *upload_data_size, void **con_cls);
67 int answer_to_connection(MHD_Connection *connection,
68 const char *url, const char *method,
69 const char *version, const char *upload_data,
70 size_t *upload_data_size, void **con_cls);
72 static void free_stream(void *cls);
81 Stream(HTTPD *parent, Framing framing, StreamType stream_type)
82 : parent(parent), framing(framing), stream_type(stream_type) {}
84 static ssize_t reader_callback_thunk(void *cls, uint64_t pos, char *buf, size_t max);
85 ssize_t reader_callback(uint64_t pos, char *buf, size_t max);
92 void add_data(const char *buf, size_t size, DataType data_type, int64_t time, AVRational timebase);
94 HTTPD *get_parent() const { return parent; }
95 StreamType get_stream_type() const { return stream_type; }
101 std::mutex buffer_mutex;
102 bool should_quit = false; // Under <buffer_mutex>.
103 std::condition_variable has_buffered_data;
104 std::deque<std::string> buffered_data; // Protected by <buffer_mutex>.
105 size_t used_of_buffered_data = 0; // How many bytes of the first element of <buffered_data> that is already used. Protected by <mutex>.
106 size_t seen_keyframe = false;
107 StreamType stream_type;
110 MHD_Daemon *mhd = nullptr;
111 std::mutex streams_mutex;
112 std::set<Stream *> streams; // Not owned.
114 EndpointCallback callback;
115 CORSPolicy cors_policy;
117 std::unordered_map<std::string, Endpoint> endpoints;
118 std::string header[NUM_STREAM_TYPES];
121 std::atomic<int64_t> metric_num_connected_clients{0};
124 #endif // !defined(_HTTPD_H)