throw NetError("SDLNet_UDP_Send");
}
+ if (HasHandler()) {
+ Handler().PacketOut(udp_pack);
+ Handler().PacketSent(seq);
+ }
+
FlagSend();
return seq;
}
}
Packet::TControl ctrl_new = pack.header.ctrl;
+ Handler().PacketIn(udp_pack);
Handler().Handle(udp_pack);
if (diff > 0) {
ConnectionHandler::ConnectionHandler()
: packets_lost(0)
, packets_received(0)
-, packet_loss(0.0f) {
+, packet_loss(0.0f)
+, stamp_cursor(15)
+, stamp_last(0)
+, rtt(64.0f)
+, next_sample(1000)
+, tx_bytes(0)
+, rx_bytes(0)
+, tx_kbps(0.0f)
+, rx_kbps(0.0f) {
+ Uint32 now = SDL_GetTicks();
+ for (Uint32 &s : stamps) {
+ s = now;
+ }
+ next_sample += now;
+}
+void ConnectionHandler::PacketSent(uint16_t seq) noexcept {
+ if (!SamplePacket(seq)) {
+ return;
+ }
+ stamp_cursor = (stamp_cursor + 1) % 16;
+ stamps[stamp_cursor] = SDL_GetTicks();
+ stamp_last = seq;
}
void ConnectionHandler::PacketLost(uint16_t seq) {
OnPacketLost(seq);
++packets_lost;
UpdatePacketLoss();
+ UpdateRTT(seq);
}
void ConnectionHandler::PacketReceived(uint16_t seq) {
OnPacketReceived(seq);
++packets_received;
UpdatePacketLoss();
+ UpdateRTT(seq);
}
void ConnectionHandler::UpdatePacketLoss() noexcept {
}
}
+void ConnectionHandler::UpdateRTT(std::uint16_t seq) noexcept {
+ if (!SamplePacket(seq)) return;
+ int diff = HeadDiff(seq);
+ if (diff > 0 || diff < -15) {
+ // packet outside observed time frame
+ return;
+ }
+ int cur_rtt = SDL_GetTicks() - stamps[(stamp_cursor + diff + 16) % 16];
+ rtt += (cur_rtt - rtt) * 0.1f;
+}
+
+bool ConnectionHandler::SamplePacket(std::uint16_t seq) const noexcept {
+ // only sample every eighth packet
+ return seq % 8 == 0;
+}
+
+int ConnectionHandler::HeadDiff(std::uint16_t seq) const noexcept {
+ int16_t diff = int16_t(seq) - int16_t(stamp_last);
+ return diff / 8;
+}
+
+void ConnectionHandler::PacketIn(const UDPpacket &pack) noexcept {
+ rx_bytes += pack.len + 20; // I know, I know, it's an estimate (about 48 for IPv6)
+ UpdateStats();
+}
+
+void ConnectionHandler::PacketOut(const UDPpacket &pack) noexcept {
+ tx_bytes += pack.len + 20;
+ UpdateStats();
+}
+
+void ConnectionHandler::UpdateStats() noexcept {
+ Uint32 now = SDL_GetTicks();
+ if (now >= next_sample) {
+ tx_kbps = float(tx_bytes) * (1.0f / 1024.0f);
+ rx_kbps = float(rx_bytes) * (1.0f / 1024.0f);
+ tx_bytes = 0;
+ rx_bytes = 0;
+ next_sample += 1000;
+ }
+}
+
ostream &operator <<(ostream &out, const IPaddress &addr) {
const unsigned char *host = reinterpret_cast<const unsigned char *>(&addr.host);