6 #include <microhttpd.h>
7 #include <netinet/in.h>
14 #include <libavutil/avutil.h>
18 #include "metacube2.h"
21 struct MHD_Connection;
28 global_metrics.add("num_connected_clients", &metric_num_connected_clients, Metrics::TYPE_GAUGE);
36 void HTTPD::start(int port)
38 mhd = MHD_start_daemon(MHD_USE_THREAD_PER_CONNECTION | MHD_USE_POLL_INTERNALLY | MHD_USE_DUAL_STACK,
41 &answer_to_connection_thunk, this,
42 MHD_OPTION_NOTIFY_COMPLETED, nullptr, this,
45 fprintf(stderr, "Warning: Could not open HTTP server. (Port already in use?)\n");
52 MHD_quiesce_daemon(mhd);
53 for (Stream *stream : streams) {
61 void HTTPD::add_data(StreamType stream_type, const char *buf, size_t size, bool keyframe, int64_t time, AVRational timebase)
63 unique_lock<mutex> lock(streams_mutex);
64 for (Stream *stream : streams) {
65 if (stream->get_stream_type() == stream_type) {
66 stream->add_data(buf, size, keyframe ? Stream::DATA_TYPE_KEYFRAME : Stream::DATA_TYPE_OTHER, time, timebase);
71 int HTTPD::answer_to_connection_thunk(void *cls, MHD_Connection *connection,
72 const char *url, const char *method,
73 const char *version, const char *upload_data,
74 size_t *upload_data_size, void **con_cls)
76 HTTPD *httpd = (HTTPD *)cls;
77 return httpd->answer_to_connection(connection, url, method, version, upload_data, upload_data_size, con_cls);
80 int HTTPD::answer_to_connection(MHD_Connection *connection,
81 const char *url, const char *method,
82 const char *version, const char *upload_data,
83 size_t *upload_data_size, void **con_cls)
85 // See if the URL ends in “.metacube”.
86 HTTPD::Stream::Framing framing;
87 if (strstr(url, ".metacube") == url + strlen(url) - strlen(".metacube")) {
88 framing = HTTPD::Stream::FRAMING_METACUBE;
90 framing = HTTPD::Stream::FRAMING_RAW;
92 HTTPD::StreamType stream_type;
93 if (strcmp(url, "/multicam.mp4") == 0) {
94 stream_type = HTTPD::StreamType::MULTICAM_STREAM;
96 stream_type = HTTPD::StreamType::MAIN_STREAM;
99 if (strcmp(url, "/metrics") == 0) {
100 string contents = global_metrics.serialize();
101 MHD_Response *response = MHD_create_response_from_buffer(
102 contents.size(), &contents[0], MHD_RESPMEM_MUST_COPY);
103 MHD_add_response_header(response, "Content-type", "text/plain");
104 int ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
105 MHD_destroy_response(response); // Only decreases the refcount; actual free is after the request is done.
108 if (endpoints.count(url)) {
109 pair<string, string> contents_and_type = endpoints[url].callback();
110 MHD_Response *response = MHD_create_response_from_buffer(
111 contents_and_type.first.size(), &contents_and_type.first[0], MHD_RESPMEM_MUST_COPY);
112 MHD_add_response_header(response, "Content-type", contents_and_type.second.c_str());
113 if (endpoints[url].cors_policy == ALLOW_ALL_ORIGINS) {
114 MHD_add_response_header(response, "Access-Control-Allow-Origin", "*");
116 int ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
117 MHD_destroy_response(response); // Only decreases the refcount; actual free is after the request is done.
121 // Small hack; reject unknown /channels/foo.
122 if (string(url).find("/channels/") == 0) {
123 string contents = "Not found.";
124 MHD_Response *response = MHD_create_response_from_buffer(
125 contents.size(), &contents[0], MHD_RESPMEM_MUST_COPY);
126 MHD_add_response_header(response, "Content-type", "text/plain");
127 int ret = MHD_queue_response(connection, MHD_HTTP_NOT_FOUND, response);
128 MHD_destroy_response(response); // Only decreases the refcount; actual free is after the request is done.
132 HTTPD::Stream *stream = new HTTPD::Stream(this, framing, stream_type);
133 stream->add_data(header[stream_type].data(), header[stream_type].size(), Stream::DATA_TYPE_HEADER, AV_NOPTS_VALUE, AVRational{ 1, 0 });
135 unique_lock<mutex> lock(streams_mutex);
136 streams.insert(stream);
138 ++metric_num_connected_clients;
141 // Does not strictly have to be equal to MUX_BUFFER_SIZE.
142 MHD_Response *response = MHD_create_response_from_callback(
143 (size_t)-1, MUX_BUFFER_SIZE, &HTTPD::Stream::reader_callback_thunk, stream, &HTTPD::free_stream);
144 // TODO: Content-type?
145 if (framing == HTTPD::Stream::FRAMING_METACUBE) {
146 MHD_add_response_header(response, "Content-encoding", "metacube");
149 int ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
150 MHD_destroy_response(response); // Only decreases the refcount; actual free is after the request is done.
155 void HTTPD::free_stream(void *cls)
157 HTTPD::Stream *stream = (HTTPD::Stream *)cls;
158 HTTPD *httpd = stream->get_parent();
160 unique_lock<mutex> lock(httpd->streams_mutex);
162 httpd->streams.erase(stream);
164 --httpd->metric_num_connected_clients;
167 ssize_t HTTPD::Stream::reader_callback_thunk(void *cls, uint64_t pos, char *buf, size_t max)
169 HTTPD::Stream *stream = (HTTPD::Stream *)cls;
170 return stream->reader_callback(pos, buf, max);
173 ssize_t HTTPD::Stream::reader_callback(uint64_t pos, char *buf, size_t max)
175 unique_lock<mutex> lock(buffer_mutex);
176 has_buffered_data.wait(lock, [this]{ return should_quit || !buffered_data.empty(); });
182 while (max > 0 && !buffered_data.empty()) {
183 const string &s = buffered_data.front();
184 assert(s.size() > used_of_buffered_data);
185 size_t len = s.size() - used_of_buffered_data;
187 // Consume the entire (rest of the) string.
188 memcpy(buf, s.data() + used_of_buffered_data, len);
192 buffered_data.pop_front();
193 used_of_buffered_data = 0;
195 // We don't need the entire string; just use the first part of it.
196 memcpy(buf, s.data() + used_of_buffered_data, max);
198 used_of_buffered_data += max;
207 void HTTPD::Stream::add_data(const char *buf, size_t buf_size, HTTPD::Stream::DataType data_type, int64_t time, AVRational timebase)
212 if (data_type == DATA_TYPE_KEYFRAME) {
213 seen_keyframe = true;
214 } else if (data_type == DATA_TYPE_OTHER && !seen_keyframe) {
215 // Start sending only once we see a keyframe.
219 unique_lock<mutex> lock(buffer_mutex);
221 if (framing == FRAMING_METACUBE) {
223 if (data_type == DATA_TYPE_HEADER) {
224 flags |= METACUBE_FLAGS_HEADER;
225 } else if (data_type == DATA_TYPE_OTHER) {
226 flags |= METACUBE_FLAGS_NOT_SUITABLE_FOR_STREAM_START;
229 // If we're about to send a keyframe, send a pts metadata block
231 if ((flags & METACUBE_FLAGS_NOT_SUITABLE_FOR_STREAM_START) == 0 && time != AV_NOPTS_VALUE) {
232 metacube2_pts_packet packet;
233 packet.type = htobe64(METACUBE_METADATA_TYPE_NEXT_BLOCK_PTS);
234 packet.pts = htobe64(time);
235 packet.timebase_num = htobe64(timebase.num);
236 packet.timebase_den = htobe64(timebase.den);
238 metacube2_block_header hdr;
239 memcpy(hdr.sync, METACUBE2_SYNC, sizeof(hdr.sync));
240 hdr.size = htonl(sizeof(packet));
241 hdr.flags = htons(METACUBE_FLAGS_METADATA);
242 hdr.csum = htons(metacube2_compute_crc(&hdr));
243 buffered_data.emplace_back((char *)&hdr, sizeof(hdr));
244 buffered_data.emplace_back((char *)&packet, sizeof(packet));
247 metacube2_block_header hdr;
248 memcpy(hdr.sync, METACUBE2_SYNC, sizeof(hdr.sync));
249 hdr.size = htonl(buf_size);
250 hdr.flags = htons(flags);
251 hdr.csum = htons(metacube2_compute_crc(&hdr));
252 buffered_data.emplace_back((char *)&hdr, sizeof(hdr));
254 buffered_data.emplace_back(buf, buf_size);
256 // Send a Metacube2 timestamp every keyframe.
257 if (framing == FRAMING_METACUBE && data_type == DATA_TYPE_KEYFRAME) {
259 clock_gettime(CLOCK_REALTIME, &now);
261 metacube2_timestamp_packet packet;
262 packet.type = htobe64(METACUBE_METADATA_TYPE_ENCODER_TIMESTAMP);
263 packet.tv_sec = htobe64(now.tv_sec);
264 packet.tv_nsec = htobe64(now.tv_nsec);
266 metacube2_block_header hdr;
267 memcpy(hdr.sync, METACUBE2_SYNC, sizeof(hdr.sync));
268 hdr.size = htonl(sizeof(packet));
269 hdr.flags = htons(METACUBE_FLAGS_METADATA);
270 hdr.csum = htons(metacube2_compute_crc(&hdr));
271 buffered_data.emplace_back((char *)&hdr, sizeof(hdr));
272 buffered_data.emplace_back((char *)&packet, sizeof(packet));
275 has_buffered_data.notify_all();
278 void HTTPD::Stream::stop()
280 unique_lock<mutex> lock(buffer_mutex);
282 has_buffered_data.notify_all();