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(const char *output_filename, int width, int height)
28 : width(width), height(height)
30 AVFormatContext *avctx = avformat_alloc_context();
31 avctx->oformat = av_guess_format(NULL, output_filename, NULL);
32 strcpy(avctx->filename, output_filename);
33 if (avio_open2(&avctx->pb, output_filename, AVIO_FLAG_WRITE, &avctx->interrupt_callback, NULL) < 0) {
34 fprintf(stderr, "%s: avio_open2() failed\n", output_filename);
38 file_mux.reset(new Mux(avctx, width, height));
41 void HTTPD::start(int port)
43 MHD_start_daemon(MHD_USE_THREAD_PER_CONNECTION | MHD_USE_POLL_INTERNALLY | MHD_USE_DUAL_STACK,
46 &answer_to_connection_thunk, this, MHD_OPTION_END);
49 void HTTPD::add_packet(const AVPacket &pkt, int64_t pts, int64_t dts)
51 for (Stream *stream : streams) {
52 stream->add_packet(pkt, pts, dts);
54 file_mux->add_packet(pkt, pts, dts);
57 int HTTPD::answer_to_connection_thunk(void *cls, MHD_Connection *connection,
58 const char *url, const char *method,
59 const char *version, const char *upload_data,
60 size_t *upload_data_size, void **con_cls)
62 HTTPD *httpd = (HTTPD *)cls;
63 return httpd->answer_to_connection(connection, url, method, version, upload_data, upload_data_size, con_cls);
66 int HTTPD::answer_to_connection(MHD_Connection *connection,
67 const char *url, const char *method,
68 const char *version, const char *upload_data,
69 size_t *upload_data_size, void **con_cls)
71 printf("url %s\n", url);
72 AVOutputFormat *oformat = av_guess_format(STREAM_MUX_NAME, nullptr, nullptr);
73 assert(oformat != nullptr);
74 HTTPD::Stream *stream = new HTTPD::Stream(oformat, width, height);
75 streams.push_back(stream);
77 // Does not strictly have to be equal to MUX_BUFFER_SIZE.
78 MHD_Response *response = MHD_create_response_from_callback(
79 (size_t)-1, MUX_BUFFER_SIZE, &HTTPD::Stream::reader_callback_thunk, stream, &HTTPD::free_stream);
80 int ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
81 //MHD_destroy_response(response);
86 void HTTPD::free_stream(void *cls)
88 HTTPD::Stream *stream = (HTTPD::Stream *)cls;
92 HTTPD::Mux::Mux(AVFormatContext *avctx, int width, int height)
95 AVCodec *codec_video = avcodec_find_encoder(AV_CODEC_ID_H264);
96 avstream_video = avformat_new_stream(avctx, codec_video);
97 if (avstream_video == nullptr) {
98 fprintf(stderr, "avformat_new_stream() failed\n");
101 avstream_video->time_base = AVRational{1, TIMEBASE};
102 avstream_video->codec->width = width;
103 avstream_video->codec->height = height;
104 avstream_video->codec->time_base = AVRational{1, TIMEBASE};
105 avstream_video->codec->ticks_per_frame = 1; // or 2?
107 // Colorspace details. Closely correspond to settings in EffectChain_finalize,
108 // as noted in each comment.
109 // Note that the H.264 stream also contains this information and depending on the
110 // mux, this might simply get ignored. See sps_rbsp().
111 avstream_video->codec->color_primaries = AVCOL_PRI_BT709; // RGB colorspace (inout_format.color_space).
112 avstream_video->codec->color_trc = AVCOL_TRC_UNSPECIFIED; // Gamma curve (inout_format.gamma_curve).
113 avstream_video->codec->colorspace = AVCOL_SPC_SMPTE170M; // YUV colorspace (output_ycbcr_format.luma_coefficients).
114 avstream_video->codec->color_range = AVCOL_RANGE_MPEG; // Full vs. limited range (output_ycbcr_format.full_range).
115 avstream_video->codec->chroma_sample_location = AVCHROMA_LOC_LEFT; // Chroma sample location. See chroma_offset_0[] in Mixer::subsample_chroma().
116 avstream_video->codec->field_order = AV_FIELD_PROGRESSIVE;
118 AVCodec *codec_audio = avcodec_find_encoder(AUDIO_OUTPUT_CODEC);
119 avstream_audio = avformat_new_stream(avctx, codec_audio);
120 if (avstream_audio == nullptr) {
121 fprintf(stderr, "avformat_new_stream() failed\n");
124 avstream_audio->time_base = AVRational{1, TIMEBASE};
125 avstream_audio->codec->bit_rate = AUDIO_OUTPUT_BIT_RATE;
126 avstream_audio->codec->sample_rate = OUTPUT_FREQUENCY;
127 avstream_audio->codec->sample_fmt = AUDIO_OUTPUT_SAMPLE_FMT;
128 avstream_audio->codec->channels = 2;
129 avstream_audio->codec->channel_layout = AV_CH_LAYOUT_STEREO;
130 avstream_audio->codec->time_base = AVRational{1, TIMEBASE};
132 AVDictionary *options = NULL;
133 vector<pair<string, string>> opts = MUX_OPTS;
134 for (pair<string, string> opt : opts) {
135 av_dict_set(&options, opt.first.c_str(), opt.second.c_str(), 0);
137 if (avformat_write_header(avctx, &options) < 0) {
138 fprintf(stderr, "avformat_write_header() failed\n");
145 av_write_trailer(avctx);
146 avformat_free_context(avctx);
149 void HTTPD::Mux::add_packet(const AVPacket &pkt, int64_t pts, int64_t dts)
152 av_copy_packet(&pkt_copy, &pkt);
153 if (pkt.stream_index == 0) {
154 pkt_copy.pts = av_rescale_q(pts, AVRational{1, TIMEBASE}, avstream_video->time_base);
155 pkt_copy.dts = av_rescale_q(dts, AVRational{1, TIMEBASE}, avstream_video->time_base);
156 } else if (pkt.stream_index == 1) {
157 pkt_copy.pts = av_rescale_q(pts, AVRational{1, TIMEBASE}, avstream_audio->time_base);
158 pkt_copy.dts = av_rescale_q(dts, AVRational{1, TIMEBASE}, avstream_audio->time_base);
163 if (av_interleaved_write_frame(avctx, &pkt_copy) < 0) {
164 fprintf(stderr, "av_interleaved_write_frame() failed\n");
169 HTTPD::Stream::Stream(AVOutputFormat *oformat, int width, int height)
171 AVFormatContext *avctx = avformat_alloc_context();
172 avctx->oformat = oformat;
173 uint8_t *buf = (uint8_t *)av_malloc(MUX_BUFFER_SIZE);
174 avctx->pb = avio_alloc_context(buf, MUX_BUFFER_SIZE, 1, this, nullptr, &HTTPD::Stream::write_packet_thunk, nullptr);
175 avctx->flags = AVFMT_FLAG_CUSTOM_IO;
177 mux.reset(new Mux(avctx, width, height));
180 ssize_t HTTPD::Stream::reader_callback_thunk(void *cls, uint64_t pos, char *buf, size_t max)
182 HTTPD::Stream *stream = (HTTPD::Stream *)cls;
183 return stream->reader_callback(pos, buf, max);
186 ssize_t HTTPD::Stream::reader_callback(uint64_t pos, char *buf, size_t max)
188 unique_lock<mutex> lock(buffer_mutex);
189 has_buffered_data.wait(lock, [this]{ return !buffered_data.empty(); });
192 while (max > 0 && !buffered_data.empty()) {
193 const string &s = buffered_data.front();
194 assert(s.size() > used_of_buffered_data);
195 size_t len = s.size() - used_of_buffered_data;
197 // Consume the entire (rest of the) string.
198 memcpy(buf, s.data() + used_of_buffered_data, len);
201 buffered_data.pop_front();
202 used_of_buffered_data = 0;
204 // We don't need the entire string; just use the first part of it.
205 memcpy(buf, s.data() + used_of_buffered_data, max);
206 used_of_buffered_data += max;
215 void HTTPD::Stream::add_packet(const AVPacket &pkt, int64_t pts, int64_t dts)
217 mux->add_packet(pkt, pts, dts);
220 int HTTPD::Stream::write_packet_thunk(void *opaque, uint8_t *buf, int buf_size)
222 HTTPD::Stream *stream = (HTTPD::Stream *)opaque;
223 return stream->write_packet(buf, buf_size);
226 int HTTPD::Stream::write_packet(uint8_t *buf, int buf_size)
228 unique_lock<mutex> lock(buffer_mutex);
229 buffered_data.emplace_back((char *)buf, buf_size);
230 has_buffered_data.notify_all();