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.
11 #include <microhttpd.h>
14 #include <sys/types.h>
15 #include <condition_variable>
22 struct MHD_Connection;
25 #include <libavcodec/avcodec.h>
26 #include <libavformat/avformat.h>
27 #include <libavformat/avio.h>
32 enum PacketDestination {
33 DESTINATION_FILE_ONLY,
34 DESTINATION_HTTP_ONLY,
35 DESTINATION_FILE_AND_HTTP
38 HTTPD(int width, int height);
40 void add_packet(const AVPacket &pkt, int64_t pts, int64_t dts, PacketDestination destination);
42 // You can only have one going at the same time.
43 void open_output_file(const std::string &filename);
44 void close_output_file();
47 static int answer_to_connection_thunk(void *cls, MHD_Connection *connection,
48 const char *url, const char *method,
49 const char *version, const char *upload_data,
50 size_t *upload_data_size, void **con_cls);
52 int answer_to_connection(MHD_Connection *connection,
53 const char *url, const char *method,
54 const char *version, const char *upload_data,
55 size_t *upload_data_size, void **con_cls);
57 static void free_stream(void *cls);
59 static void request_completed_thunk(void *cls, struct MHD_Connection *connection, void **con_cls, enum MHD_RequestTerminationCode toe);
61 void request_completed(struct MHD_Connection *connection, void **con_cls, enum MHD_RequestTerminationCode toe);
67 CODEC_NV12, // Uncompressed 4:2:0.
70 Mux(AVFormatContext *avctx, int width, int height, Codec video_codec); // Takes ownership of avctx.
72 void add_packet(const AVPacket &pkt, int64_t pts, int64_t dts);
75 bool seen_keyframe = false;
76 AVFormatContext *avctx;
77 AVStream *avstream_video, *avstream_audio;
82 Stream(AVOutputFormat *oformat, int width, int height);
84 static ssize_t reader_callback_thunk(void *cls, uint64_t pos, char *buf, size_t max);
85 ssize_t reader_callback(uint64_t pos, char *buf, size_t max);
87 void add_packet(const AVPacket &pkt, int64_t pts, int64_t dts);
90 static int write_packet_thunk(void *opaque, uint8_t *buf, int buf_size);
91 int write_packet(uint8_t *buf, int buf_size);
93 std::mutex buffer_mutex;
94 std::condition_variable has_buffered_data;
95 std::deque<std::string> buffered_data; // Protected by <mutex>.
96 size_t used_of_buffered_data = 0; // How many bytes of the first element of <buffered_data> that is already used. Protected by <mutex>.
98 std::unique_ptr<Mux> mux; // Must come last to be destroyed before buffered_data, since the destructor can write bytes.
101 std::mutex streams_mutex;
102 std::set<Stream *> streams; // Not owned.
105 std::unique_ptr<Mux> file_mux; // To local disk.
108 #endif // !defined(_HTTPD_H)