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

   1 #ifndef _HTTPD_H
   2 #define _HTTPD_H
   3
   4 // A class dealing with stream output, both to HTTP (thus the class name)
   5 // and to local output files. Since we generally have very few outputs
   6 // (end clients are not meant to connect directly to our stream; it should be
   7 // transcoded by something else and then sent to a reflector), we don't need to
   8 // care a lot about performance. Thus, we solve this by the simplest possible
   9 // way, namely having one ffmpeg mux per output.
  10
  11 #include <microhttpd.h>
  12 #include <stddef.h>
  13 #include <stdint.h>
  14 #include <sys/types.h>
  15 #include <condition_variable>
  16 #include <deque>
  17 #include <memory>
  18 #include <mutex>
  19 #include <string>
  20 #include <vector>
  21
  22 struct MHD_Connection;
  23
  24 extern "C" {
  25 #include <libavcodec/avcodec.h>
  26 #include <libavformat/avformat.h>
  27 #include <libavformat/avio.h>
  28 }
  29
  30 class HTTPD {
  31 public:
  32         HTTPD(const char *output_filename, int width, int height);
  33         void start(int port);
  34         void add_packet(const AVPacket &pkt, int64_t pts, int64_t dts);
  35
  36 private:
  37         static int answer_to_connection_thunk(void *cls, MHD_Connection *connection,
  38                                               const char *url, const char *method,
  39                                               const char *version, const char *upload_data,
  40                                               size_t *upload_data_size, void **con_cls);
  41
  42         int answer_to_connection(MHD_Connection *connection,
  43                                  const char *url, const char *method,
  44                                  const char *version, const char *upload_data,
  45                                  size_t *upload_data_size, void **con_cls);
  46
  47         static void free_stream(void *cls);
  48
  49         class Mux {
  50         public:
  51                 Mux(AVFormatContext *avctx, int width, int height);  // Takes ownership of avctx.
  52                 ~Mux();
  53                 void add_packet(const AVPacket &pkt, int64_t pts, int64_t dts);
  54
  55         private:
  56                 AVFormatContext *avctx;
  57                 AVStream *avstream_video, *avstream_audio;
  58         };
  59
  60         class Stream {
  61         public:
  62                 Stream(AVOutputFormat *oformat, int width, int height);
  63
  64                 static ssize_t reader_callback_thunk(void *cls, uint64_t pos, char *buf, size_t max);
  65                 ssize_t reader_callback(uint64_t pos, char *buf, size_t max);
  66
  67                 void add_packet(const AVPacket &pkt, int64_t pts, int64_t dts);
  68
  69         private:
  70                 static int write_packet_thunk(void *opaque, uint8_t *buf, int buf_size);
  71                 int write_packet(uint8_t *buf, int buf_size);
  72
  73                 AVIOContext *avio;
  74                 std::unique_ptr<Mux> mux;
  75
  76                 std::mutex buffer_mutex;
  77                 std::condition_variable has_buffered_data;
  78                 std::deque<std::string> buffered_data;  // Protected by <mutex>.
  79                 size_t used_of_buffered_data = 0;  // How many bytes of the first element of <buffered_data> that is already used. Protected by <mutex>.
  80         };
  81
  82         std::vector<Stream *> streams;  // Not owned.
  83
  84         int width, height;
  85         std::unique_ptr<Mux> file_mux;  // To local disk.
  86 };
  87
  88 #endif  // !defined(_HTTPD_H)