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 <deque>
  13 #include <string>
  14 #include <mutex>
  15 #include <condition_variable>
  16 #include <vector>
  17
  18 extern "C" {
  19 #include <libavformat/avformat.h>
  20 }
  21
  22 class HTTPD {
  23 public:
  24         HTTPD(const char *output_filename, int width, int height);
  25         void start(int port);
  26         void add_packet(const AVPacket &pkt, int64_t pts, int64_t dts);
  27
  28 private:
  29         static int answer_to_connection_thunk(void *cls, MHD_Connection *connection,
  30                                               const char *url, const char *method,
  31                                               const char *version, const char *upload_data,
  32                                               size_t *upload_data_size, void **con_cls);
  33
  34         int answer_to_connection(MHD_Connection *connection,
  35                                  const char *url, const char *method,
  36                                  const char *version, const char *upload_data,
  37                                  size_t *upload_data_size, void **con_cls);
  38
  39         static void free_stream(void *cls);
  40
  41         class Mux {
  42         public:
  43                 Mux(AVFormatContext *avctx, int width, int height);  // Takes ownership of avctx.
  44                 ~Mux();
  45                 void add_packet(const AVPacket &pkt, int64_t pts, int64_t dts);
  46
  47         private:
  48                 AVFormatContext *avctx;
  49                 AVStream *avstream_video, *avstream_audio;
  50         };
  51
  52         class Stream {
  53         public:
  54                 Stream(AVOutputFormat *oformat, int width, int height);
  55
  56                 static ssize_t reader_callback_thunk(void *cls, uint64_t pos, char *buf, size_t max);
  57                 ssize_t reader_callback(uint64_t pos, char *buf, size_t max);
  58
  59                 void add_packet(const AVPacket &pkt, int64_t pts, int64_t dts);
  60
  61         private:
  62                 static int write_packet_thunk(void *opaque, uint8_t *buf, int buf_size);
  63                 int write_packet(uint8_t *buf, int buf_size);
  64
  65                 AVIOContext *avio;
  66                 std::unique_ptr<Mux> mux;
  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
  74         std::vector<Stream *> streams;  // Not owned.
  75
  76         int width, height;
  77         std::unique_ptr<Mux> file_mux;  // To local disk.
  78 };
  79
  80 #endif  // !defined(_HTTPD_H)