#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>
+// A class dealing with stream output to HTTP.
+
#include <stddef.h>
#include <stdint.h>
#include <sys/types.h>
+#include <atomic>
#include <condition_variable>
#include <deque>
-#include <memory>
+#include <functional>
#include <mutex>
#include <set>
#include <string>
+#include <unordered_map>
+#include <utility>
struct MHD_Connection;
-
-extern "C" {
-#include <libavcodec/avcodec.h>
-#include <libavformat/avformat.h>
-#include <libavformat/avio.h>
-}
+struct MHD_Daemon;
class HTTPD {
public:
- HTTPD(int width, int height);
- void start(int port);
- void add_packet(const AVPacket &pkt, int64_t pts, int64_t dts);
+ // Returns a pair of content and content-type.
+ using EndpointCallback = std::function<std::pair<std::string, std::string>()>;
+
+ HTTPD();
+ ~HTTPD();
- // You can only have one going at the same time.
- void open_output_file(const std::string &filename);
- void close_output_file();
+ // Should be called before start().
+ void set_header(const std::string &data) {
+ header = data;
+ }
+
+ // Should be called before start() (due to threading issues).
+ enum CORSPolicy {
+ NO_CORS_POLICY,
+ ALLOW_ALL_ORIGINS
+ };
+ void add_endpoint(const std::string &url, const EndpointCallback &callback, CORSPolicy cors_policy) {
+ endpoints[url] = Endpoint{ callback, cors_policy };
+ }
+
+ void start(int port);
+ void add_data(const char *buf, size_t size, bool keyframe);
+ int64_t get_num_connected_clients() const {
+ return metric_num_connected_clients.load();
+ }
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:
- Mux(AVFormatContext *avctx, int width, int height); // 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, int width, int height);
+ enum Framing {
+ FRAMING_RAW,
+ FRAMING_METACUBE
+ };
+ Stream(HTTPD *parent, Framing framing) : parent(parent), framing(framing) {}
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, int64_t pts, int64_t dts);
+ enum DataType {
+ DATA_TYPE_HEADER,
+ DATA_TYPE_KEYFRAME,
+ DATA_TYPE_OTHER
+ };
+ void add_data(const char *buf, size_t size, DataType data_type);
+ void stop();
+ HTTPD *get_parent() const { return parent; }
private:
- static int write_packet_thunk(void *opaque, uint8_t *buf, int buf_size);
- int write_packet(uint8_t *buf, int buf_size);
+ HTTPD *parent;
+ Framing framing;
std::mutex buffer_mutex;
+ bool should_quit = false; // Under <buffer_mutex>.
std::condition_variable has_buffered_data;
- std::deque<std::string> buffered_data; // Protected by <mutex>.
+ std::deque<std::string> buffered_data; // Protected by <buffer_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.
+ size_t seen_keyframe = false;
};
+ MHD_Daemon *mhd = nullptr;
std::mutex streams_mutex;
std::set<Stream *> streams; // Not owned.
+ struct Endpoint {
+ EndpointCallback callback;
+ CORSPolicy cors_policy;
+ };
+ std::unordered_map<std::string, Endpoint> endpoints;
+ std::string header;
- int width, height;
- std::unique_ptr<Mux> file_mux; // To local disk.
+ // Metrics.
+ std::atomic<int64_t> metric_num_connected_clients{0};
};
#endif // !defined(_HTTPD_H)