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

   1 #include <assert.h>
   2 #include <microhttpd.h>
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <string.h>
   6
   7 extern "C" {
   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>
  15 }
  16
  17 #include <vector>
  18
  19 #include "httpd.h"
  20
  21 #include "defs.h"
  22 #include "flags.h"
  23 #include "timebase.h"
  24
  25 struct MHD_Connection;
  26 struct MHD_Response;
  27
  28 using namespace std;
  29
  30 HTTPD::HTTPD(int width, int height)
  31         : width(width), height(height)
  32 {
  33 }
  34
  35 void HTTPD::start(int port)
  36 {
  37         MHD_start_daemon(MHD_USE_THREAD_PER_CONNECTION | MHD_USE_POLL_INTERNALLY | MHD_USE_DUAL_STACK,
  38                          port,
  39                          nullptr, nullptr,
  40                          &answer_to_connection_thunk, this,
  41                          MHD_OPTION_NOTIFY_COMPLETED, &request_completed_thunk, this,
  42                          MHD_OPTION_END);
  43 }
  44
  45 void HTTPD::add_packet(const AVPacket &pkt, int64_t pts, int64_t dts, PacketDestination destination)
  46 {
  47         unique_lock<mutex> lock(streams_mutex);
  48         if (destination != DESTINATION_FILE_ONLY) {
  49                 for (Stream *stream : streams) {
  50                         stream->add_packet(pkt, pts, dts);
  51                 }
  52         }
  53         if (file_mux && destination != DESTINATION_HTTP_ONLY) {
  54                 file_mux->add_packet(pkt, pts, dts);
  55         }
  56 }
  57
  58 void HTTPD::open_output_file(const string &filename)
  59 {
  60         AVFormatContext *avctx = avformat_alloc_context();
  61         avctx->oformat = av_guess_format(NULL, filename.c_str(), NULL);
  62         assert(filename.size() < sizeof(avctx->filename) - 1);
  63         strcpy(avctx->filename, filename.c_str());
  64
  65         string url = "file:" + filename;
  66         int ret = avio_open2(&avctx->pb, url.c_str(), AVIO_FLAG_WRITE, &avctx->interrupt_callback, NULL);
  67         if (ret < 0) {
  68                 char tmp[AV_ERROR_MAX_STRING_SIZE];
  69                 fprintf(stderr, "%s: avio_open2() failed: %s\n", filename.c_str(), av_make_error_string(tmp, sizeof(tmp), ret));
  70                 exit(1);
  71         }
  72
  73         file_mux.reset(new Mux(avctx, width, height, Mux::CODEC_H264, TIMEBASE));
  74 }
  75
  76 void HTTPD::close_output_file()
  77 {
  78         file_mux.reset();
  79 }
  80
  81 int HTTPD::answer_to_connection_thunk(void *cls, 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)
  85 {
  86         HTTPD *httpd = (HTTPD *)cls;
  87         return httpd->answer_to_connection(connection, url, method, version, upload_data, upload_data_size, con_cls);
  88 }
  89
  90 int HTTPD::answer_to_connection(MHD_Connection *connection,
  91                                 const char *url, const char *method,
  92                                 const char *version, const char *upload_data,
  93                                 size_t *upload_data_size, void **con_cls)
  94 {
  95         AVOutputFormat *oformat = av_guess_format(global_flags.stream_mux_name.c_str(), nullptr, nullptr);
  96         assert(oformat != nullptr);
  97
  98         int time_base = global_flags.stream_coarse_timebase ? COARSE_TIMEBASE : TIMEBASE;
  99         HTTPD::Stream *stream = new HTTPD::Stream(oformat, width, height, time_base);
 100         {
 101                 unique_lock<mutex> lock(streams_mutex);
 102                 streams.insert(stream);
 103         }
 104         *con_cls = stream;
 105
 106         // Does not strictly have to be equal to MUX_BUFFER_SIZE.
 107         MHD_Response *response = MHD_create_response_from_callback(
 108                 (size_t)-1, MUX_BUFFER_SIZE, &HTTPD::Stream::reader_callback_thunk, stream, &HTTPD::free_stream);
 109         int ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
 110         //MHD_destroy_response(response);
 111
 112         return ret;
 113 }
 114
 115 void HTTPD::free_stream(void *cls)
 116 {
 117         // FIXME: When is this actually called, if ever?
 118         // Also, shouldn't we remove it from streams?
 119         HTTPD::Stream *stream = (HTTPD::Stream *)cls;
 120         delete stream;
 121 }
 122
 123 void HTTPD::request_completed_thunk(void *cls, struct MHD_Connection *connection, void **con_cls, enum MHD_RequestTerminationCode toe)
 124 {
 125         HTTPD *httpd = (HTTPD *)cls;
 126         return httpd->request_completed(connection, con_cls, toe);
 127 }
 128
 129 void HTTPD::request_completed(struct MHD_Connection *connection, void **con_cls, enum MHD_RequestTerminationCode toe)
 130 {
 131         if (con_cls == nullptr) {
 132                 // Request was never set up.
 133                 return;
 134         }
 135         HTTPD::Stream *stream = (HTTPD::Stream *)*con_cls;
 136         {
 137                 unique_lock<mutex> lock(streams_mutex);
 138                 delete stream;
 139                 streams.erase(stream);
 140         }
 141 }
 142
 143 HTTPD::Stream::Stream(AVOutputFormat *oformat, int width, int height, int time_base)
 144 {
 145         AVFormatContext *avctx = avformat_alloc_context();
 146         avctx->oformat = oformat;
 147         uint8_t *buf = (uint8_t *)av_malloc(MUX_BUFFER_SIZE);
 148         avctx->pb = avio_alloc_context(buf, MUX_BUFFER_SIZE, 1, this, nullptr, &HTTPD::Stream::write_packet_thunk, nullptr);
 149
 150         Mux::Codec video_codec;
 151         if (global_flags.uncompressed_video_to_http) {
 152                 video_codec = Mux::CODEC_NV12;
 153         } else {
 154                 video_codec = Mux::CODEC_H264;
 155         }
 156
 157         avctx->flags = AVFMT_FLAG_CUSTOM_IO;
 158
 159         mux.reset(new Mux(avctx, width, height, video_codec, time_base));
 160 }
 161
 162 ssize_t HTTPD::Stream::reader_callback_thunk(void *cls, uint64_t pos, char *buf, size_t max)
 163 {
 164         HTTPD::Stream *stream = (HTTPD::Stream *)cls;
 165         return stream->reader_callback(pos, buf, max);
 166 }
 167
 168 ssize_t HTTPD::Stream::reader_callback(uint64_t pos, char *buf, size_t max)
 169 {
 170         unique_lock<mutex> lock(buffer_mutex);
 171         has_buffered_data.wait(lock, [this]{ return !buffered_data.empty(); });
 172
 173         ssize_t ret = 0;
 174         while (max > 0 && !buffered_data.empty()) {
 175                 const string &s = buffered_data.front();
 176                 assert(s.size() > used_of_buffered_data);
 177                 size_t len = s.size() - used_of_buffered_data;
 178                 if (max >= len) {
 179                         // Consume the entire (rest of the) string.
 180                         memcpy(buf, s.data() + used_of_buffered_data, len);
 181                         buf += len;
 182                         ret += len;
 183                         max -= len;
 184                         buffered_data.pop_front();
 185                         used_of_buffered_data = 0;
 186                 } else {
 187                         // We don't need the entire string; just use the first part of it.
 188                         memcpy(buf, s.data() + used_of_buffered_data, max);
 189                         buf += max;
 190                         used_of_buffered_data += max;
 191                         ret += max;
 192                         max = 0;
 193                 }
 194         }
 195
 196         return ret;
 197 }
 198
 199 void HTTPD::Stream::add_packet(const AVPacket &pkt, int64_t pts, int64_t dts)
 200 {
 201         mux->add_packet(pkt, pts, dts);
 202 }
 203
 204 int HTTPD::Stream::write_packet_thunk(void *opaque, uint8_t *buf, int buf_size)
 205 {
 206         HTTPD::Stream *stream = (HTTPD::Stream *)opaque;
 207         return stream->write_packet(buf, buf_size);
 208 }
 209
 210 int HTTPD::Stream::write_packet(uint8_t *buf, int buf_size)
 211 {
 212         unique_lock<mutex> lock(buffer_mutex);
 213         buffered_data.emplace_back((char *)buf, buf_size);
 214         has_buffered_data.notify_all();
 215         return buf_size;
 216 }
 217