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);
76 MHD_Response *response = MHD_create_response_from_callback(
77 (size_t)-1, 1048576, &HTTPD::Stream::reader_callback_thunk, stream, &HTTPD::free_stream);
78 int ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
79 //MHD_destroy_response(response);
84 void HTTPD::free_stream(void *cls)
86 HTTPD::Stream *stream = (HTTPD::Stream *)cls;
90 HTTPD::Mux::Mux(AVFormatContext *avctx, int width, int height)
93 AVCodec *codec_video = avcodec_find_encoder(AV_CODEC_ID_H264);
94 avstream_video = avformat_new_stream(avctx, codec_video);
95 if (avstream_video == nullptr) {
96 fprintf(stderr, "avformat_new_stream() failed\n");
99 avstream_video->time_base = AVRational{1, TIMEBASE};
100 avstream_video->codec->width = width;
101 avstream_video->codec->height = height;
102 avstream_video->codec->time_base = AVRational{1, TIMEBASE};
103 avstream_video->codec->ticks_per_frame = 1; // or 2?
105 // Colorspace details. Closely correspond to settings in EffectChain_finalize,
106 // as noted in each comment.
107 // Note that the H.264 stream also contains this information and depending on the
108 // mux, this might simply get ignored. See sps_rbsp().
109 avstream_video->codec->color_primaries = AVCOL_PRI_BT709; // RGB colorspace (inout_format.color_space).
110 avstream_video->codec->color_trc = AVCOL_TRC_UNSPECIFIED; // Gamma curve (inout_format.gamma_curve).
111 avstream_video->codec->colorspace = AVCOL_SPC_SMPTE170M; // YUV colorspace (output_ycbcr_format.luma_coefficients).
112 avstream_video->codec->color_range = AVCOL_RANGE_MPEG; // Full vs. limited range (output_ycbcr_format.full_range).
113 avstream_video->codec->chroma_sample_location = AVCHROMA_LOC_LEFT; // Chroma sample location. See chroma_offset_0[] in Mixer::subsample_chroma().
114 avstream_video->codec->field_order = AV_FIELD_PROGRESSIVE;
116 AVCodec *codec_audio = avcodec_find_encoder(AUDIO_OUTPUT_CODEC);
117 avstream_audio = avformat_new_stream(avctx, codec_audio);
118 if (avstream_audio == nullptr) {
119 fprintf(stderr, "avformat_new_stream() failed\n");
122 avstream_audio->time_base = AVRational{1, TIMEBASE};
123 avstream_audio->codec->bit_rate = AUDIO_OUTPUT_BIT_RATE;
124 avstream_audio->codec->sample_rate = OUTPUT_FREQUENCY;
125 avstream_audio->codec->sample_fmt = AUDIO_OUTPUT_SAMPLE_FMT;
126 avstream_audio->codec->channels = 2;
127 avstream_audio->codec->channel_layout = AV_CH_LAYOUT_STEREO;
128 avstream_audio->codec->time_base = AVRational{1, TIMEBASE};
130 AVDictionary *options = NULL;
131 vector<pair<string, string>> opts = MUX_OPTS;
132 for (pair<string, string> opt : opts) {
133 av_dict_set(&options, opt.first.c_str(), opt.second.c_str(), 0);
135 if (avformat_write_header(avctx, &options) < 0) {
136 fprintf(stderr, "avformat_write_header() failed\n");
143 av_write_trailer(avctx);
144 avformat_free_context(avctx);
147 void HTTPD::Mux::add_packet(const AVPacket &pkt, int64_t pts, int64_t dts)
150 av_copy_packet(&pkt_copy, &pkt);
151 if (pkt.stream_index == 0) {
152 pkt_copy.pts = av_rescale_q(pts, AVRational{1, TIMEBASE}, avstream_video->time_base);
153 pkt_copy.dts = av_rescale_q(dts, AVRational{1, TIMEBASE}, avstream_video->time_base);
154 } else if (pkt.stream_index == 1) {
155 pkt_copy.pts = av_rescale_q(pts, AVRational{1, TIMEBASE}, avstream_audio->time_base);
156 pkt_copy.dts = av_rescale_q(dts, AVRational{1, TIMEBASE}, avstream_audio->time_base);
161 if (av_interleaved_write_frame(avctx, &pkt_copy) < 0) {
162 fprintf(stderr, "av_interleaved_write_frame() failed\n");
167 HTTPD::Stream::Stream(AVOutputFormat *oformat, int width, int height)
169 AVFormatContext *avctx = avformat_alloc_context();
170 avctx->oformat = oformat;
171 uint8_t *buf = (uint8_t *)av_malloc(1048576);
172 avctx->pb = avio_alloc_context(buf, 1048576, 1, this, nullptr, &HTTPD::Stream::write_packet_thunk, nullptr);
173 avctx->flags = AVFMT_FLAG_CUSTOM_IO;
175 mux.reset(new Mux(avctx, width, height));
178 ssize_t HTTPD::Stream::reader_callback_thunk(void *cls, uint64_t pos, char *buf, size_t max)
180 HTTPD::Stream *stream = (HTTPD::Stream *)cls;
181 return stream->reader_callback(pos, buf, max);
184 ssize_t HTTPD::Stream::reader_callback(uint64_t pos, char *buf, size_t max)
186 unique_lock<mutex> lock(buffer_mutex);
187 has_buffered_data.wait(lock, [this]{ return !buffered_data.empty(); });
190 while (max > 0 && !buffered_data.empty()) {
191 const string &s = buffered_data.front();
192 assert(s.size() > used_of_buffered_data);
193 size_t len = s.size() - used_of_buffered_data;
195 // Consume the entire (rest of the) string.
196 memcpy(buf, s.data() + used_of_buffered_data, len);
199 buffered_data.pop_front();
200 used_of_buffered_data = 0;
202 // We don't need the entire string; just use the first part of it.
203 memcpy(buf, s.data() + used_of_buffered_data, max);
204 used_of_buffered_data += max;
213 void HTTPD::Stream::add_packet(const AVPacket &pkt, int64_t pts, int64_t dts)
215 mux->add_packet(pkt, pts, dts);
218 int HTTPD::Stream::write_packet_thunk(void *opaque, uint8_t *buf, int buf_size)
220 HTTPD::Stream *stream = (HTTPD::Stream *)opaque;
221 return stream->write_packet(buf, buf_size);
224 int HTTPD::Stream::write_packet(uint8_t *buf, int buf_size)
226 unique_lock<mutex> lock(buffer_mutex);
227 buffered_data.emplace_back((char *)buf, buf_size);
228 has_buffered_data.notify_all();