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

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