2 #include <microhttpd.h>
8 #include <libavcodec/avcodec.h>
9 #include <libavutil/channel_layout.h>
10 #include <libavutil/mathematics.h>
11 #include <libavutil/mem.h>
12 #include <libavutil/pixfmt.h>
13 #include <libavutil/rational.h>
14 #include <libavutil/samplefmt.h>
25 struct MHD_Connection;
30 HTTPD::HTTPD(int width, int height)
31 : width(width), height(height)
35 void HTTPD::start(int port)
37 MHD_start_daemon(MHD_USE_THREAD_PER_CONNECTION | MHD_USE_POLL_INTERNALLY | MHD_USE_DUAL_STACK,
40 &answer_to_connection_thunk, this,
41 MHD_OPTION_NOTIFY_COMPLETED, &request_completed_thunk, this,
45 void HTTPD::add_packet(const AVPacket &pkt, int64_t pts, int64_t dts)
47 unique_lock<mutex> lock(streams_mutex);
48 for (Stream *stream : streams) {
49 stream->add_packet(pkt, pts, dts);
53 int HTTPD::answer_to_connection_thunk(void *cls, MHD_Connection *connection,
54 const char *url, const char *method,
55 const char *version, const char *upload_data,
56 size_t *upload_data_size, void **con_cls)
58 HTTPD *httpd = (HTTPD *)cls;
59 return httpd->answer_to_connection(connection, url, method, version, upload_data, upload_data_size, con_cls);
62 int HTTPD::answer_to_connection(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 AVOutputFormat *oformat = av_guess_format(global_flags.stream_mux_name.c_str(), nullptr, nullptr);
68 assert(oformat != nullptr);
70 int time_base = global_flags.stream_coarse_timebase ? COARSE_TIMEBASE : TIMEBASE;
71 HTTPD::Stream *stream = new HTTPD::Stream(oformat, width, height, time_base);
73 unique_lock<mutex> lock(streams_mutex);
74 streams.insert(stream);
78 // Does not strictly have to be equal to MUX_BUFFER_SIZE.
79 MHD_Response *response = MHD_create_response_from_callback(
80 (size_t)-1, MUX_BUFFER_SIZE, &HTTPD::Stream::reader_callback_thunk, stream, &HTTPD::free_stream);
81 int ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
82 //MHD_destroy_response(response);
87 void HTTPD::free_stream(void *cls)
89 // FIXME: When is this actually called, if ever?
90 // Also, shouldn't we remove it from streams?
91 HTTPD::Stream *stream = (HTTPD::Stream *)cls;
95 void HTTPD::request_completed_thunk(void *cls, struct MHD_Connection *connection, void **con_cls, enum MHD_RequestTerminationCode toe)
97 HTTPD *httpd = (HTTPD *)cls;
98 return httpd->request_completed(connection, con_cls, toe);
101 void HTTPD::request_completed(struct MHD_Connection *connection, void **con_cls, enum MHD_RequestTerminationCode toe)
103 if (con_cls == nullptr) {
104 // Request was never set up.
107 HTTPD::Stream *stream = (HTTPD::Stream *)*con_cls;
109 unique_lock<mutex> lock(streams_mutex);
111 streams.erase(stream);
115 HTTPD::Stream::Stream(AVOutputFormat *oformat, int width, int height, int time_base)
117 AVFormatContext *avctx = avformat_alloc_context();
118 avctx->oformat = oformat;
119 uint8_t *buf = (uint8_t *)av_malloc(MUX_BUFFER_SIZE);
120 avctx->pb = avio_alloc_context(buf, MUX_BUFFER_SIZE, 1, this, nullptr, &HTTPD::Stream::write_packet_thunk, nullptr);
122 Mux::Codec video_codec;
123 if (global_flags.uncompressed_video_to_http) {
124 video_codec = Mux::CODEC_NV12;
126 video_codec = Mux::CODEC_H264;
129 avctx->flags = AVFMT_FLAG_CUSTOM_IO;
131 mux.reset(new Mux(avctx, width, height, video_codec, time_base));
134 ssize_t HTTPD::Stream::reader_callback_thunk(void *cls, uint64_t pos, char *buf, size_t max)
136 HTTPD::Stream *stream = (HTTPD::Stream *)cls;
137 return stream->reader_callback(pos, buf, max);
140 ssize_t HTTPD::Stream::reader_callback(uint64_t pos, char *buf, size_t max)
142 unique_lock<mutex> lock(buffer_mutex);
143 has_buffered_data.wait(lock, [this]{ return !buffered_data.empty(); });
146 while (max > 0 && !buffered_data.empty()) {
147 const string &s = buffered_data.front();
148 assert(s.size() > used_of_buffered_data);
149 size_t len = s.size() - used_of_buffered_data;
151 // Consume the entire (rest of the) string.
152 memcpy(buf, s.data() + used_of_buffered_data, len);
156 buffered_data.pop_front();
157 used_of_buffered_data = 0;
159 // We don't need the entire string; just use the first part of it.
160 memcpy(buf, s.data() + used_of_buffered_data, max);
162 used_of_buffered_data += max;
171 void HTTPD::Stream::add_packet(const AVPacket &pkt, int64_t pts, int64_t dts)
173 mux->add_packet(pkt, pts, dts);
176 int HTTPD::Stream::write_packet_thunk(void *opaque, uint8_t *buf, int buf_size)
178 HTTPD::Stream *stream = (HTTPD::Stream *)opaque;
179 return stream->write_packet(buf, buf_size);
182 int HTTPD::Stream::write_packet(uint8_t *buf, int buf_size)
184 unique_lock<mutex> lock(buffer_mutex);
185 buffered_data.emplace_back((char *)buf, buf_size);
186 has_buffered_data.notify_all();