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 int ret = avio_open2(&avctx->pb, output_filename, AVIO_FLAG_WRITE, &avctx->interrupt_callback, NULL);
35 char tmp[AV_ERROR_MAX_STRING_SIZE];
36 fprintf(stderr, "%s: avio_open2() failed: %s\n", output_filename, av_make_error_string(tmp, sizeof(tmp), ret));
40 file_mux.reset(new Mux(avctx, width, height));
43 void HTTPD::start(int port)
45 MHD_start_daemon(MHD_USE_THREAD_PER_CONNECTION | MHD_USE_POLL_INTERNALLY | MHD_USE_DUAL_STACK,
48 &answer_to_connection_thunk, this, MHD_OPTION_END);
51 void HTTPD::add_packet(const AVPacket &pkt, int64_t pts, int64_t dts)
53 for (Stream *stream : streams) {
54 stream->add_packet(pkt, pts, dts);
56 file_mux->add_packet(pkt, pts, dts);
59 int HTTPD::answer_to_connection_thunk(void *cls, MHD_Connection *connection,
60 const char *url, const char *method,
61 const char *version, const char *upload_data,
62 size_t *upload_data_size, void **con_cls)
64 HTTPD *httpd = (HTTPD *)cls;
65 return httpd->answer_to_connection(connection, url, method, version, upload_data, upload_data_size, con_cls);
68 int HTTPD::answer_to_connection(MHD_Connection *connection,
69 const char *url, const char *method,
70 const char *version, const char *upload_data,
71 size_t *upload_data_size, void **con_cls)
73 printf("url %s\n", url);
74 AVOutputFormat *oformat = av_guess_format(STREAM_MUX_NAME, nullptr, nullptr);
75 assert(oformat != nullptr);
76 HTTPD::Stream *stream = new HTTPD::Stream(oformat, width, height);
77 streams.push_back(stream);
79 // Does not strictly have to be equal to MUX_BUFFER_SIZE.
80 MHD_Response *response = MHD_create_response_from_callback(
81 (size_t)-1, MUX_BUFFER_SIZE, &HTTPD::Stream::reader_callback_thunk, stream, &HTTPD::free_stream);
82 int ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
83 //MHD_destroy_response(response);
88 void HTTPD::free_stream(void *cls)
90 HTTPD::Stream *stream = (HTTPD::Stream *)cls;
94 HTTPD::Mux::Mux(AVFormatContext *avctx, int width, int height)
97 AVCodec *codec_video = avcodec_find_encoder(AV_CODEC_ID_H264);
98 avstream_video = avformat_new_stream(avctx, codec_video);
99 if (avstream_video == nullptr) {
100 fprintf(stderr, "avformat_new_stream() failed\n");
103 avstream_video->time_base = AVRational{1, TIMEBASE};
104 avstream_video->codec->width = width;
105 avstream_video->codec->height = height;
106 avstream_video->codec->time_base = AVRational{1, TIMEBASE};
107 avstream_video->codec->ticks_per_frame = 1; // or 2?
109 // Colorspace details. Closely correspond to settings in EffectChain_finalize,
110 // as noted in each comment.
111 // Note that the H.264 stream also contains this information and depending on the
112 // mux, this might simply get ignored. See sps_rbsp().
113 avstream_video->codec->color_primaries = AVCOL_PRI_BT709; // RGB colorspace (inout_format.color_space).
114 avstream_video->codec->color_trc = AVCOL_TRC_UNSPECIFIED; // Gamma curve (inout_format.gamma_curve).
115 avstream_video->codec->colorspace = AVCOL_SPC_SMPTE170M; // YUV colorspace (output_ycbcr_format.luma_coefficients).
116 avstream_video->codec->color_range = AVCOL_RANGE_MPEG; // Full vs. limited range (output_ycbcr_format.full_range).
117 avstream_video->codec->chroma_sample_location = AVCHROMA_LOC_LEFT; // Chroma sample location. See chroma_offset_0[] in Mixer::subsample_chroma().
118 avstream_video->codec->field_order = AV_FIELD_PROGRESSIVE;
120 AVCodec *codec_audio = avcodec_find_encoder(AUDIO_OUTPUT_CODEC);
121 avstream_audio = avformat_new_stream(avctx, codec_audio);
122 if (avstream_audio == nullptr) {
123 fprintf(stderr, "avformat_new_stream() failed\n");
126 avstream_audio->time_base = AVRational{1, TIMEBASE};
127 avstream_audio->codec->bit_rate = AUDIO_OUTPUT_BIT_RATE;
128 avstream_audio->codec->sample_rate = OUTPUT_FREQUENCY;
129 avstream_audio->codec->sample_fmt = AUDIO_OUTPUT_SAMPLE_FMT;
130 avstream_audio->codec->channels = 2;
131 avstream_audio->codec->channel_layout = AV_CH_LAYOUT_STEREO;
132 avstream_audio->codec->time_base = AVRational{1, TIMEBASE};
134 AVDictionary *options = NULL;
135 vector<pair<string, string>> opts = MUX_OPTS;
136 for (pair<string, string> opt : opts) {
137 av_dict_set(&options, opt.first.c_str(), opt.second.c_str(), 0);
139 if (avformat_write_header(avctx, &options) < 0) {
140 fprintf(stderr, "avformat_write_header() failed\n");
147 av_write_trailer(avctx);
148 avformat_free_context(avctx);
151 void HTTPD::Mux::add_packet(const AVPacket &pkt, int64_t pts, int64_t dts)
154 av_copy_packet(&pkt_copy, &pkt);
155 if (pkt.stream_index == 0) {
156 pkt_copy.pts = av_rescale_q(pts, AVRational{1, TIMEBASE}, avstream_video->time_base);
157 pkt_copy.dts = av_rescale_q(dts, AVRational{1, TIMEBASE}, avstream_video->time_base);
158 } else if (pkt.stream_index == 1) {
159 pkt_copy.pts = av_rescale_q(pts, AVRational{1, TIMEBASE}, avstream_audio->time_base);
160 pkt_copy.dts = av_rescale_q(dts, AVRational{1, TIMEBASE}, avstream_audio->time_base);
165 if (av_interleaved_write_frame(avctx, &pkt_copy) < 0) {
166 fprintf(stderr, "av_interleaved_write_frame() failed\n");
171 HTTPD::Stream::Stream(AVOutputFormat *oformat, int width, int height)
173 AVFormatContext *avctx = avformat_alloc_context();
174 avctx->oformat = oformat;
175 uint8_t *buf = (uint8_t *)av_malloc(MUX_BUFFER_SIZE);
176 avctx->pb = avio_alloc_context(buf, MUX_BUFFER_SIZE, 1, this, nullptr, &HTTPD::Stream::write_packet_thunk, nullptr);
177 avctx->flags = AVFMT_FLAG_CUSTOM_IO;
179 mux.reset(new Mux(avctx, width, height));
182 ssize_t HTTPD::Stream::reader_callback_thunk(void *cls, uint64_t pos, char *buf, size_t max)
184 HTTPD::Stream *stream = (HTTPD::Stream *)cls;
185 return stream->reader_callback(pos, buf, max);
188 ssize_t HTTPD::Stream::reader_callback(uint64_t pos, char *buf, size_t max)
190 unique_lock<mutex> lock(buffer_mutex);
191 has_buffered_data.wait(lock, [this]{ return !buffered_data.empty(); });
194 while (max > 0 && !buffered_data.empty()) {
195 const string &s = buffered_data.front();
196 assert(s.size() > used_of_buffered_data);
197 size_t len = s.size() - used_of_buffered_data;
199 // Consume the entire (rest of the) string.
200 memcpy(buf, s.data() + used_of_buffered_data, len);
203 buffered_data.pop_front();
204 used_of_buffered_data = 0;
206 // We don't need the entire string; just use the first part of it.
207 memcpy(buf, s.data() + used_of_buffered_data, max);
208 used_of_buffered_data += max;
217 void HTTPD::Stream::add_packet(const AVPacket &pkt, int64_t pts, int64_t dts)
219 mux->add_packet(pkt, pts, dts);
222 int HTTPD::Stream::write_packet_thunk(void *opaque, uint8_t *buf, int buf_size)
224 HTTPD::Stream *stream = (HTTPD::Stream *)opaque;
225 return stream->write_packet(buf, buf_size);
228 int HTTPD::Stream::write_packet(uint8_t *buf, int buf_size)
230 unique_lock<mutex> lock(buffer_mutex);
231 buffered_data.emplace_back((char *)buf, buf_size);
232 has_buffered_data.notify_all();