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)
  46 {
  47         unique_lock<mutex> lock(streams_mutex);
  48         for (Stream *stream : streams) {
  49                 stream->add_packet(pkt, pts, dts);
  50         }
  51 }
  52
  53 int HTTPD::answer_to_connection_thunk(void *cls, 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         HTTPD *httpd = (HTTPD *)cls;
  59         return httpd->answer_to_connection(connection, url, method, version, upload_data, upload_data_size, con_cls);
  60 }
  61
  62 int HTTPD::answer_to_connection(MHD_Connection *connection,
  63                                 const char *url, const char *method,
  64                                 const char *version, const char *upload_data,
  65                                 size_t *upload_data_size, void **con_cls)
  66 {
  67         AVOutputFormat *oformat = av_guess_format(global_flags.stream_mux_name.c_str(), nullptr, nullptr);
  68         assert(oformat != nullptr);
  69
  70         int time_base = global_flags.stream_coarse_timebase ? COARSE_TIMEBASE : TIMEBASE;
  71         HTTPD::Stream *stream = new HTTPD::Stream(oformat, width, height, time_base);
  72         {
  73                 unique_lock<mutex> lock(streams_mutex);
  74                 streams.insert(stream);
  75         }
  76         *con_cls = stream;
  77
  78         // Does not strictly have to be equal to MUX_BUFFER_SIZE.
  79         MHD_Response *response = MHD_create_response_from_callback(
  80                 (size_t)-1, MUX_BUFFER_SIZE, &HTTPD::Stream::reader_callback_thunk, stream, &HTTPD::free_stream);
  81         int ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
  82         //MHD_destroy_response(response);
  83
  84         return ret;
  85 }
  86
  87 void HTTPD::free_stream(void *cls)
  88 {
  89         // FIXME: When is this actually called, if ever?
  90         // Also, shouldn't we remove it from streams?
  91         HTTPD::Stream *stream = (HTTPD::Stream *)cls;
  92         delete stream;
  93 }
  94
  95 void HTTPD::request_completed_thunk(void *cls, struct MHD_Connection *connection, void **con_cls, enum MHD_RequestTerminationCode toe)
  96 {
  97         HTTPD *httpd = (HTTPD *)cls;
  98         return httpd->request_completed(connection, con_cls, toe);
  99 }
 100
 101 void HTTPD::request_completed(struct MHD_Connection *connection, void **con_cls, enum MHD_RequestTerminationCode toe)
 102 {
 103         if (con_cls == nullptr) {
 104                 // Request was never set up.
 105                 return;
 106         }
 107         HTTPD::Stream *stream = (HTTPD::Stream *)*con_cls;
 108         {
 109                 unique_lock<mutex> lock(streams_mutex);
 110                 delete stream;
 111                 streams.erase(stream);
 112         }
 113 }
 114
 115 HTTPD::Stream::Stream(AVOutputFormat *oformat, int width, int height, int time_base)
 116 {
 117         AVFormatContext *avctx = avformat_alloc_context();
 118         avctx->oformat = oformat;
 119         uint8_t *buf = (uint8_t *)av_malloc(MUX_BUFFER_SIZE);
 120         avctx->pb = avio_alloc_context(buf, MUX_BUFFER_SIZE, 1, this, nullptr, &HTTPD::Stream::write_packet_thunk, nullptr);
 121
 122         Mux::Codec video_codec;
 123         if (global_flags.uncompressed_video_to_http) {
 124                 video_codec = Mux::CODEC_NV12;
 125         } else {
 126                 video_codec = Mux::CODEC_H264;
 127         }
 128
 129         avctx->flags = AVFMT_FLAG_CUSTOM_IO;
 130
 131         mux.reset(new Mux(avctx, width, height, video_codec, time_base));
 132 }
 133
 134 ssize_t HTTPD::Stream::reader_callback_thunk(void *cls, uint64_t pos, char *buf, size_t max)
 135 {
 136         HTTPD::Stream *stream = (HTTPD::Stream *)cls;
 137         return stream->reader_callback(pos, buf, max);
 138 }
 139
 140 ssize_t HTTPD::Stream::reader_callback(uint64_t pos, char *buf, size_t max)
 141 {
 142         unique_lock<mutex> lock(buffer_mutex);
 143         has_buffered_data.wait(lock, [this]{ return !buffered_data.empty(); });
 144
 145         ssize_t ret = 0;
 146         while (max > 0 && !buffered_data.empty()) {
 147                 const string &s = buffered_data.front();
 148                 assert(s.size() > used_of_buffered_data);
 149                 size_t len = s.size() - used_of_buffered_data;
 150                 if (max >= len) {
 151                         // Consume the entire (rest of the) string.
 152                         memcpy(buf, s.data() + used_of_buffered_data, len);
 153                         buf += len;
 154                         ret += len;
 155                         max -= len;
 156                         buffered_data.pop_front();
 157                         used_of_buffered_data = 0;
 158                 } else {
 159                         // We don't need the entire string; just use the first part of it.
 160                         memcpy(buf, s.data() + used_of_buffered_data, max);
 161                         buf += max;
 162                         used_of_buffered_data += max;
 163                         ret += max;
 164                         max = 0;
 165                 }
 166         }
 167
 168         return ret;
 169 }
 170
 171 void HTTPD::Stream::add_packet(const AVPacket &pkt, int64_t pts, int64_t dts)
 172 {
 173         mux->add_packet(pkt, pts, dts);
 174 }
 175
 176 int HTTPD::Stream::write_packet_thunk(void *opaque, uint8_t *buf, int buf_size)
 177 {
 178         HTTPD::Stream *stream = (HTTPD::Stream *)opaque;
 179         return stream->write_packet(buf, buf_size);
 180 }
 181
 182 int HTTPD::Stream::write_packet(uint8_t *buf, int buf_size)
 183 {
 184         unique_lock<mutex> lock(buffer_mutex);
 185         buffered_data.emplace_back((char *)buf, buf_size);
 186         has_buffered_data.notify_all();
 187         return buf_size;
 188 }
 189