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>
22 struct MHD_Connection;
27 HTTPD::HTTPD(int width, int height)
28 : width(width), height(height)
32 void HTTPD::start(int port)
34 MHD_start_daemon(MHD_USE_THREAD_PER_CONNECTION | MHD_USE_POLL_INTERNALLY | MHD_USE_DUAL_STACK,
37 &answer_to_connection_thunk, this, MHD_OPTION_END);
40 void HTTPD::add_packet(const AVPacket &pkt, int64_t pts, int64_t dts)
42 for (Stream *stream : streams) {
43 stream->add_packet(pkt, pts, dts);
46 file_mux->add_packet(pkt, pts, dts);
50 void HTTPD::open_output_file(const string &filename)
52 AVFormatContext *avctx = avformat_alloc_context();
53 avctx->oformat = av_guess_format(NULL, filename.c_str(), NULL);
54 strcpy(avctx->filename, filename.c_str());
56 string url = "file:" + filename;
57 int ret = avio_open2(&avctx->pb, url.c_str(), AVIO_FLAG_WRITE, &avctx->interrupt_callback, NULL);
59 char tmp[AV_ERROR_MAX_STRING_SIZE];
60 fprintf(stderr, "%s: avio_open2() failed: %s\n", filename.c_str(), av_make_error_string(tmp, sizeof(tmp), ret));
64 file_mux.reset(new Mux(avctx, width, height));
67 void HTTPD::close_output_file()
72 int HTTPD::answer_to_connection_thunk(void *cls, MHD_Connection *connection,
73 const char *url, const char *method,
74 const char *version, const char *upload_data,
75 size_t *upload_data_size, void **con_cls)
77 HTTPD *httpd = (HTTPD *)cls;
78 return httpd->answer_to_connection(connection, url, method, version, upload_data, upload_data_size, con_cls);
81 int HTTPD::answer_to_connection(MHD_Connection *connection,
82 const char *url, const char *method,
83 const char *version, const char *upload_data,
84 size_t *upload_data_size, void **con_cls)
86 printf("url %s\n", url);
87 AVOutputFormat *oformat = av_guess_format(STREAM_MUX_NAME, nullptr, nullptr);
88 assert(oformat != nullptr);
89 HTTPD::Stream *stream = new HTTPD::Stream(oformat, width, height);
90 streams.push_back(stream);
92 // Does not strictly have to be equal to MUX_BUFFER_SIZE.
93 MHD_Response *response = MHD_create_response_from_callback(
94 (size_t)-1, MUX_BUFFER_SIZE, &HTTPD::Stream::reader_callback_thunk, stream, &HTTPD::free_stream);
95 int ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
96 //MHD_destroy_response(response);
101 void HTTPD::free_stream(void *cls)
103 HTTPD::Stream *stream = (HTTPD::Stream *)cls;
107 HTTPD::Mux::Mux(AVFormatContext *avctx, int width, int height)
110 AVCodec *codec_video = avcodec_find_encoder(AV_CODEC_ID_H264);
111 avstream_video = avformat_new_stream(avctx, codec_video);
112 if (avstream_video == nullptr) {
113 fprintf(stderr, "avformat_new_stream() failed\n");
116 avstream_video->time_base = AVRational{1, TIMEBASE};
117 avstream_video->codec->width = width;
118 avstream_video->codec->height = height;
119 avstream_video->codec->time_base = AVRational{1, TIMEBASE};
120 avstream_video->codec->ticks_per_frame = 1; // or 2?
122 // Colorspace details. Closely correspond to settings in EffectChain_finalize,
123 // as noted in each comment.
124 // Note that the H.264 stream also contains this information and depending on the
125 // mux, this might simply get ignored. See sps_rbsp().
126 avstream_video->codec->color_primaries = AVCOL_PRI_BT709; // RGB colorspace (inout_format.color_space).
127 avstream_video->codec->color_trc = AVCOL_TRC_UNSPECIFIED; // Gamma curve (inout_format.gamma_curve).
128 avstream_video->codec->colorspace = AVCOL_SPC_SMPTE170M; // YUV colorspace (output_ycbcr_format.luma_coefficients).
129 avstream_video->codec->color_range = AVCOL_RANGE_MPEG; // Full vs. limited range (output_ycbcr_format.full_range).
130 avstream_video->codec->chroma_sample_location = AVCHROMA_LOC_LEFT; // Chroma sample location. See chroma_offset_0[] in Mixer::subsample_chroma().
131 avstream_video->codec->field_order = AV_FIELD_PROGRESSIVE;
133 AVCodec *codec_audio = avcodec_find_encoder(AUDIO_OUTPUT_CODEC);
134 avstream_audio = avformat_new_stream(avctx, codec_audio);
135 if (avstream_audio == nullptr) {
136 fprintf(stderr, "avformat_new_stream() failed\n");
139 avstream_audio->time_base = AVRational{1, TIMEBASE};
140 avstream_audio->codec->bit_rate = AUDIO_OUTPUT_BIT_RATE;
141 avstream_audio->codec->sample_rate = OUTPUT_FREQUENCY;
142 avstream_audio->codec->sample_fmt = AUDIO_OUTPUT_SAMPLE_FMT;
143 avstream_audio->codec->channels = 2;
144 avstream_audio->codec->channel_layout = AV_CH_LAYOUT_STEREO;
145 avstream_audio->codec->time_base = AVRational{1, TIMEBASE};
147 AVDictionary *options = NULL;
148 vector<pair<string, string>> opts = MUX_OPTS;
149 for (pair<string, string> opt : opts) {
150 av_dict_set(&options, opt.first.c_str(), opt.second.c_str(), 0);
152 if (avformat_write_header(avctx, &options) < 0) {
153 fprintf(stderr, "avformat_write_header() failed\n");
160 av_write_trailer(avctx);
161 avformat_free_context(avctx);
164 void HTTPD::Mux::add_packet(const AVPacket &pkt, int64_t pts, int64_t dts)
167 av_copy_packet(&pkt_copy, &pkt);
168 if (pkt.stream_index == 0) {
169 pkt_copy.pts = av_rescale_q(pts, AVRational{1, TIMEBASE}, avstream_video->time_base);
170 pkt_copy.dts = av_rescale_q(dts, AVRational{1, TIMEBASE}, avstream_video->time_base);
171 } else if (pkt.stream_index == 1) {
172 pkt_copy.pts = av_rescale_q(pts, AVRational{1, TIMEBASE}, avstream_audio->time_base);
173 pkt_copy.dts = av_rescale_q(dts, AVRational{1, TIMEBASE}, avstream_audio->time_base);
178 if (av_interleaved_write_frame(avctx, &pkt_copy) < 0) {
179 fprintf(stderr, "av_interleaved_write_frame() failed\n");
184 HTTPD::Stream::Stream(AVOutputFormat *oformat, int width, int height)
186 AVFormatContext *avctx = avformat_alloc_context();
187 avctx->oformat = oformat;
188 uint8_t *buf = (uint8_t *)av_malloc(MUX_BUFFER_SIZE);
189 avctx->pb = avio_alloc_context(buf, MUX_BUFFER_SIZE, 1, this, nullptr, &HTTPD::Stream::write_packet_thunk, nullptr);
190 avctx->flags = AVFMT_FLAG_CUSTOM_IO;
192 mux.reset(new Mux(avctx, width, height));
195 ssize_t HTTPD::Stream::reader_callback_thunk(void *cls, uint64_t pos, char *buf, size_t max)
197 HTTPD::Stream *stream = (HTTPD::Stream *)cls;
198 return stream->reader_callback(pos, buf, max);
201 ssize_t HTTPD::Stream::reader_callback(uint64_t pos, char *buf, size_t max)
203 unique_lock<mutex> lock(buffer_mutex);
204 has_buffered_data.wait(lock, [this]{ return !buffered_data.empty(); });
207 while (max > 0 && !buffered_data.empty()) {
208 const string &s = buffered_data.front();
209 assert(s.size() > used_of_buffered_data);
210 size_t len = s.size() - used_of_buffered_data;
212 // Consume the entire (rest of the) string.
213 memcpy(buf, s.data() + used_of_buffered_data, len);
216 buffered_data.pop_front();
217 used_of_buffered_data = 0;
219 // We don't need the entire string; just use the first part of it.
220 memcpy(buf, s.data() + used_of_buffered_data, max);
221 used_of_buffered_data += max;
230 void HTTPD::Stream::add_packet(const AVPacket &pkt, int64_t pts, int64_t dts)
232 mux->add_packet(pkt, pts, dts);
235 int HTTPD::Stream::write_packet_thunk(void *opaque, uint8_t *buf, int buf_size)
237 HTTPD::Stream *stream = (HTTPD::Stream *)opaque;
238 return stream->write_packet(buf, buf_size);
241 int HTTPD::Stream::write_packet(uint8_t *buf, int buf_size)
243 unique_lock<mutex> lock(buffer_mutex);
244 buffered_data.emplace_back((char *)buf, buf_size);
245 has_buffered_data.notify_all();