#ifndef _HTTPD_H
#define _HTTPD_H
+// A class dealing with stream output, both to HTTP (thus the class name)
+// and to local output files. Since we generally have very few outputs
+// (end clients are not meant to connect directly to our stream; it should be
+// transcoded by something else and then sent to a reflector), we don't need to
+// care a lot about performance. Thus, we solve this by the simplest possible
+// way, namely having one ffmpeg mux per output.
+
#include <microhttpd.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <sys/types.h>
+#include <condition_variable>
#include <deque>
-#include <string>
+#include <memory>
#include <mutex>
-#include <condition_variable>
-#include <vector>
+#include <set>
+#include <string>
+
+struct MHD_Connection;
extern "C" {
+#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
+#include <libavformat/avio.h>
}
class HTTPD {
public:
- HTTPD();
+ enum PacketDestination {
+ DESTINATION_FILE_ONLY,
+ DESTINATION_HTTP_ONLY,
+ DESTINATION_FILE_AND_HTTP
+ };
+
+ HTTPD(int width, int height);
void start(int port);
- void add_packet(const AVPacket &pkt);
+ void add_packet(const AVPacket &pkt, int64_t pts, int64_t dts, PacketDestination destination);
+
+ // You can only have one going at the same time.
+ void open_output_file(const std::string &filename);
+ void close_output_file();
private:
static int answer_to_connection_thunk(void *cls, MHD_Connection *connection,
static void free_stream(void *cls);
+ static void request_completed_thunk(void *cls, struct MHD_Connection *connection, void **con_cls, enum MHD_RequestTerminationCode toe);
+
+ void request_completed(struct MHD_Connection *connection, void **con_cls, enum MHD_RequestTerminationCode toe);
+
+ class Mux {
+ public:
+ enum Codec {
+ CODEC_H264,
+ CODEC_NV12, // Uncompressed 4:2:0.
+ };
+
+ Mux(AVFormatContext *avctx, int width, int height, Codec video_codec); // Takes ownership of avctx.
+ ~Mux();
+ void add_packet(const AVPacket &pkt, int64_t pts, int64_t dts);
+
+ private:
+ bool seen_keyframe = false;
+ AVFormatContext *avctx;
+ AVStream *avstream_video, *avstream_audio;
+ };
+
class Stream {
public:
- Stream(AVOutputFormat *oformat);
- ~Stream();
+ Stream(AVOutputFormat *oformat, int width, int height);
static ssize_t reader_callback_thunk(void *cls, uint64_t pos, char *buf, size_t max);
ssize_t reader_callback(uint64_t pos, char *buf, size_t max);
- void add_packet(const AVPacket &pkt);
+ void add_packet(const AVPacket &pkt, int64_t pts, int64_t dts);
private:
static int write_packet_thunk(void *opaque, uint8_t *buf, int buf_size);
int write_packet(uint8_t *buf, int buf_size);
- AVIOContext *avio;
- AVFormatContext *avctx;
- AVStream *avstream_video, *avstream_audio;
-
std::mutex buffer_mutex;
std::condition_variable has_buffered_data;
std::deque<std::string> buffered_data; // Protected by <mutex>.
size_t used_of_buffered_data = 0; // How many bytes of the first element of <buffered_data> that is already used. Protected by <mutex>.
+
+ std::unique_ptr<Mux> mux; // Must come last to be destroyed before buffered_data, since the destructor can write bytes.
};
- std::vector<Stream *> streams; // Not owned.
+ std::mutex streams_mutex;
+ std::set<Stream *> streams; // Not owned.
+
+ int width, height;
+ std::unique_ptr<Mux> file_mux; // To local disk.
};
#endif // !defined(_HTTPD_H)