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#ifndef _HTTPD_H
#define _HTTPD_H
// A class dealing with stream output to HTTP.
#include <assert.h>
#include <atomic>
#include <condition_variable>
#include <deque>
#include <functional>
#include <mutex>
#include <set>
#include <stddef.h>
#include <stdint.h>
#include <string>
#include <sys/types.h>
#include <map>
#include <unordered_map>
#include <utility>
extern "C" {
#include <libavutil/rational.h>
}
#include <microhttpd.h>
#include "shared/shared_defs.h"
struct MHD_Connection;
struct MHD_Daemon;
class HTTPD {
public:
// Returns a pair of content and content-type.
using EndpointCallback = std::function<std::pair<std::string, std::string>()>;
HTTPD();
~HTTPD();
enum StreamType {
MAIN_STREAM,
MULTICAM_STREAM,
SIPHON_STREAM // The only one that can have stream_index != 0.
};
struct StreamID {
StreamType type;
unsigned index;
bool operator< (const StreamID &other) const {
if (type != other.type)
return type < other.type;
return index < other.index;
}
bool operator== (const StreamID &other) const {
return (type == other.type && index == other.index);
}
};
// 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 stop();
void set_header(StreamID stream_id, const std::string &data);
void add_data(StreamID stream_id, const char *buf, size_t size, bool keyframe, int64_t time, AVRational timebase);
int64_t get_num_connected_clients() const
{
return metric_num_connected_clients.load();
}
int64_t get_num_connected_multicam_clients() const {
return metric_num_connected_multicam_clients.load();
}
int64_t get_num_connected_siphon_clients(unsigned stream_idx) const {
assert(stream_idx < MAX_VIDEO_CARDS);
return metric_num_connected_siphon_clients[stream_idx].load();
}
private:
// libmicrohttpd 0.9.71 broke the type of MHD_YES/MHD_NO, causing
// compilation errors for C++ and undefined behavior for C.
#if MHD_VERSION >= 0x00097002
using MHD_Result = ::MHD_Result;
#else
using MHD_Result = int;
#endif
static MHD_Result answer_to_connection_thunk(void *cls, MHD_Connection *connection,
const char *url, const char *method,
const char *version, const char *upload_data,
size_t *upload_data_size, void **con_cls);
MHD_Result answer_to_connection(MHD_Connection *connection,
const char *url, const char *method,
const char *version, const char *upload_data,
size_t *upload_data_size, void **con_cls);
static void free_stream(void *cls);
class Stream {
public:
enum Framing {
FRAMING_RAW,
FRAMING_METACUBE
};
Stream(HTTPD *parent, Framing framing, StreamID stream_id)
: parent(parent), framing(framing), stream_id(stream_id) {}
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);
enum DataType {
DATA_TYPE_HEADER,
DATA_TYPE_KEYFRAME,
DATA_TYPE_OTHER
};
void add_data(const char *buf, size_t size, DataType data_type, int64_t time, AVRational timebase);
void stop();
HTTPD *get_parent() const { return parent; }
StreamID get_stream_id() const { return stream_id; }
private:
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 <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 <buffer_mutex>.
size_t buffered_data_bytes = 0; // The sum of all size() in buffered_data. Protected by <buffer_mutex>.
size_t seen_keyframe = false;
StreamID stream_id;
};
void add_data_locked(StreamID stream_id, const char *buf, size_t size, Stream::DataType data_type, int64_t time, AVRational timebase);
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::map<StreamID, std::string> header;
// Metrics.
std::atomic<int64_t> metric_num_connected_clients{0};
std::atomic<int64_t> metric_num_connected_multicam_clients{0};
std::atomic<int64_t> metric_num_connected_siphon_clients[MAX_VIDEO_CARDS] {{0}};
};
#endif // !defined(_HTTPD_H)
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