git.sesse.net Git - nageru/blob - httpd.cpp

   1 #include <string.h>
   2 #include <microhttpd.h>
   3 #include <assert.h>
   4
   5 extern "C" {
   6 #include <libavcodec/avcodec.h>
   7 }
   8
   9 #include "httpd.h"
  10 #include "timebase.h"
  11
  12 using namespace std;
  13
  14 HTTPD::HTTPD(const char *output_filename, int width, int height)
  15         : width(width), height(height)
  16 {
  17         AVFormatContext *avctx = avformat_alloc_context();
  18         avctx->oformat = av_guess_format(NULL, output_filename, NULL);
  19         strcpy(avctx->filename, output_filename);
  20         if (avio_open2(&avctx->pb, output_filename, AVIO_FLAG_WRITE, &avctx->interrupt_callback, NULL) < 0) {
  21                 fprintf(stderr, "%s: avio_open2() failed\n", output_filename);
  22                 exit(1);
  23         }
  24
  25         file_mux.reset(new Mux(avctx, width, height));
  26 }
  27
  28 void HTTPD::start(int port)
  29 {
  30         MHD_start_daemon(MHD_USE_THREAD_PER_CONNECTION | MHD_USE_POLL_INTERNALLY | MHD_USE_DUAL_STACK,
  31                          port,
  32                          nullptr, nullptr,
  33                          &answer_to_connection_thunk, this, MHD_OPTION_END);
  34 }
  35
  36 void HTTPD::add_packet(const AVPacket &pkt, int64_t pts, int64_t dts)
  37 {
  38         for (Stream *stream : streams) {
  39                 stream->add_packet(pkt, pts, dts);
  40         }
  41         file_mux->add_packet(pkt, pts, dts);
  42 }
  43
  44 int HTTPD::answer_to_connection_thunk(void *cls, MHD_Connection *connection,
  45                                       const char *url, const char *method,
  46                                       const char *version, const char *upload_data,
  47                                       size_t *upload_data_size, void **con_cls)
  48 {
  49         HTTPD *httpd = (HTTPD *)cls;
  50         return httpd->answer_to_connection(connection, url, method, version, upload_data, upload_data_size, con_cls);
  51 }
  52
  53 int HTTPD::answer_to_connection(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)
  57 {
  58         printf("url %s\n", url);
  59         AVOutputFormat *oformat = av_guess_format("mpegts", nullptr, nullptr);
  60         assert(oformat != nullptr);
  61         HTTPD::Stream *stream = new HTTPD::Stream(oformat, width, height);
  62         streams.push_back(stream);
  63         MHD_Response *response = MHD_create_response_from_callback(
  64                 (size_t)-1, 1048576, &HTTPD::Stream::reader_callback_thunk, stream, &HTTPD::free_stream);
  65         int ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
  66         //MHD_destroy_response(response);
  67
  68         return ret;
  69 }
  70
  71 void HTTPD::free_stream(void *cls)
  72 {
  73         HTTPD::Stream *stream = (HTTPD::Stream *)cls;
  74         delete stream;
  75 }
  76
  77 HTTPD::Mux::Mux(AVFormatContext *avctx, int width, int height)
  78         : avctx(avctx)
  79 {
  80         AVCodec *codec_video = avcodec_find_encoder(AV_CODEC_ID_H264);
  81         avstream_video = avformat_new_stream(avctx, codec_video);
  82         if (avstream_video == nullptr) {
  83                 fprintf(stderr, "avformat_new_stream() failed\n");
  84                 exit(1);
  85         }
  86         avstream_video->time_base = AVRational{1, TIMEBASE};
  87         avstream_video->codec->width = width;
  88         avstream_video->codec->height = height;
  89         avstream_video->codec->time_base = AVRational{1, TIMEBASE};
  90         avstream_video->codec->ticks_per_frame = 1;  // or 2?
  91
  92         AVCodec *codec_audio = avcodec_find_encoder(AV_CODEC_ID_MP3);
  93         avstream_audio = avformat_new_stream(avctx, codec_audio);
  94         if (avstream_audio == nullptr) {
  95                 fprintf(stderr, "avformat_new_stream() failed\n");
  96                 exit(1);
  97         }
  98         avstream_audio->time_base = AVRational{1, TIMEBASE};
  99         avstream_audio->codec->bit_rate = 256000;
 100         avstream_audio->codec->sample_rate = 48000;
 101         avstream_audio->codec->sample_fmt = AV_SAMPLE_FMT_FLTP;
 102         avstream_audio->codec->channels = 2;
 103         avstream_audio->codec->channel_layout = AV_CH_LAYOUT_STEREO;
 104         avstream_audio->codec->time_base = AVRational{1, TIMEBASE};
 105
 106         if (avformat_write_header(avctx, NULL) < 0) {
 107                 fprintf(stderr, "avformat_write_header() failed\n");
 108                 exit(1);
 109         }
 110 }
 111
 112 HTTPD::Mux::~Mux()
 113 {
 114         av_write_trailer(avctx);
 115         avformat_free_context(avctx);
 116 }
 117
 118 void HTTPD::Mux::add_packet(const AVPacket &pkt, int64_t pts, int64_t dts)
 119 {
 120         AVPacket pkt_copy;
 121         av_copy_packet(&pkt_copy, &pkt);
 122         if (pkt.stream_index == 0) {
 123                 pkt_copy.pts = av_rescale_q(pts, AVRational{1, TIMEBASE}, avstream_video->time_base);
 124                 pkt_copy.dts = av_rescale_q(dts, AVRational{1, TIMEBASE}, avstream_video->time_base);
 125         } else if (pkt.stream_index == 1) {
 126                 pkt_copy.pts = av_rescale_q(pts, AVRational{1, TIMEBASE}, avstream_audio->time_base);
 127                 pkt_copy.dts = av_rescale_q(dts, AVRational{1, TIMEBASE}, avstream_audio->time_base);
 128         } else {
 129                 assert(false);
 130         }
 131
 132         if (av_interleaved_write_frame(avctx, &pkt_copy) < 0) {
 133                 fprintf(stderr, "av_interleaved_write_frame() failed\n");
 134                 exit(1);
 135         }
 136 }
 137
 138 HTTPD::Stream::Stream(AVOutputFormat *oformat, int width, int height)
 139 {
 140         AVFormatContext *avctx = avformat_alloc_context();
 141         avctx->oformat = oformat;
 142         uint8_t *buf = (uint8_t *)av_malloc(1048576);
 143         avctx->pb = avio_alloc_context(buf, 1048576, 1, this, nullptr, &HTTPD::Stream::write_packet_thunk, nullptr);
 144         avctx->flags = AVFMT_FLAG_CUSTOM_IO;
 145
 146         mux.reset(new Mux(avctx, width, height));
 147 }
 148
 149 ssize_t HTTPD::Stream::reader_callback_thunk(void *cls, uint64_t pos, char *buf, size_t max)
 150 {
 151         HTTPD::Stream *stream = (HTTPD::Stream *)cls;
 152         return stream->reader_callback(pos, buf, max);
 153 }
 154
 155 ssize_t HTTPD::Stream::reader_callback(uint64_t pos, char *buf, size_t max)
 156 {
 157         unique_lock<mutex> lock(buffer_mutex);
 158         has_buffered_data.wait(lock, [this]{ return !buffered_data.empty(); });
 159
 160         ssize_t ret = 0;
 161         while (max > 0 && !buffered_data.empty()) {
 162                 const string &s = buffered_data.front();
 163                 assert(s.size() > used_of_buffered_data);
 164                 size_t len = s.size() - used_of_buffered_data;
 165                 if (max >= len) {
 166                         // Consume the entire (rest of the) string.
 167                         memcpy(buf, s.data() + used_of_buffered_data, len);
 168                         ret += len;
 169                         max -= len;
 170                         buffered_data.pop_front();
 171                         used_of_buffered_data = 0;
 172                 } else {
 173                         // We don't need the entire string; just use the first part of it.
 174                         memcpy(buf, s.data() + used_of_buffered_data, max);
 175                         used_of_buffered_data += max;
 176                         ret += max;
 177                         max = 0;
 178                 }
 179         }
 180
 181         return ret;
 182 }
 183
 184 void HTTPD::Stream::add_packet(const AVPacket &pkt, int64_t pts, int64_t dts)
 185 {
 186         mux->add_packet(pkt, pts, dts);
 187 }
 188
 189 int HTTPD::Stream::write_packet_thunk(void *opaque, uint8_t *buf, int buf_size)
 190 {
 191         HTTPD::Stream *stream = (HTTPD::Stream *)opaque;
 192         return stream->write_packet(buf, buf_size);
 193 }
 194
 195 int HTTPD::Stream::write_packet(uint8_t *buf, int buf_size)
 196 {
 197         unique_lock<mutex> lock(buffer_mutex);
 198         buffered_data.emplace_back((char *)buf, buf_size);
 199         has_buffered_data.notify_all();
 200         return buf_size;
 201 }
 202