/
transmitmedia.cpp
1230 lines (1032 loc) · 34.9 KB
/
transmitmedia.cpp
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// Medium concretizations
// Just for formality. This file should be used
#include <iostream>
#include <iomanip>
#include <fstream>
#include <sstream>
#include <string>
#include <stdexcept>
#include <iterator>
#include <map>
#include <srt.h>
#include "netinet_any.h"
#include "appcommon.hpp"
#include "socketoptions.hpp"
#include "uriparser.hpp"
#include "transmitmedia.hpp"
#include "srt_compat.h"
using namespace std;
bool transmit_verbose = false;
std::ostream* transmit_cverb = nullptr;
volatile bool transmit_throw_on_interrupt = false;
unsigned long transmit_bw_report = 0;
unsigned long transmit_stats_report = 0;
unsigned long transmit_chunk_size = SRT_LIVE_DEF_PLSIZE;
class FileSource: public Source
{
ifstream ifile;
string filename_copy;
public:
FileSource(const string& path): ifile(path, ios::in | ios::binary), filename_copy(path)
{
if ( !ifile )
throw std::runtime_error(path + ": Can't open file for reading");
}
bytevector Read(size_t chunk) override
{
bytevector data(chunk);
ifile.read(data.data(), chunk);
size_t nread = ifile.gcount();
if ( nread < data.size() )
data.resize(nread);
if ( data.empty() )
throw ReadEOF(filename_copy);
return data;
}
bool IsOpen() override { return bool(ifile); }
bool End() override { return ifile.eof(); }
//~FileSource() { ifile.close(); }
};
class FileTarget: public Target
{
ofstream ofile;
public:
FileTarget(const string& path): ofile(path, ios::out | ios::trunc | ios::binary) {}
void Write(const bytevector& data) override
{
ofile.write(data.data(), data.size());
}
bool IsOpen() override { return !!ofile; }
bool Broken() override { return !ofile.good(); }
//~FileTarget() { ofile.close(); }
void Close() override { ofile.close(); }
};
template <class Iface> struct File;
template <> struct File<Source> { typedef FileSource type; };
template <> struct File<Target> { typedef FileTarget type; };
template <class Iface>
Iface* CreateFile(const string& name) { return new typename File<Iface>::type (name); }
template <class PerfMonType>
void PrintSrtStats(int sid, const PerfMonType& mon)
{
cout << "======= SRT STATS: sid=" << sid << endl;
cout << "PACKETS SENT: " << setw(11) << mon.pktSent << " RECEIVED: " << setw(11) << mon.pktRecv << endl;
cout << "LOST PKT SENT: " << setw(11) << mon.pktSndLoss << " RECEIVED: " << setw(11) << mon.pktRcvLoss << endl;
cout << "REXMIT SENT: " << setw(11) << mon.pktRetrans << " RECEIVED: " << setw(11) << mon.pktRcvRetrans << endl;
cout << "RATE SENDING: " << setw(11) << mon.mbpsSendRate << " RECEIVING: " << setw(11) << mon.mbpsRecvRate << endl;
cout << "BELATED RECEIVED: " << setw(11) << mon.pktRcvBelated << " AVG TIME: " << setw(11) << mon.pktRcvAvgBelatedTime << endl;
cout << "REORDER DISTANCE: " << setw(11) << mon.pktReorderDistance << endl;
cout << "WINDOW: FLOW: " << setw(11) << mon.pktFlowWindow << " CONGESTION: " << setw(11) << mon.pktCongestionWindow << " FLIGHT: " << setw(11) << mon.pktFlightSize << endl;
cout << "RTT: " << setw(9) << mon.msRTT << "ms BANDWIDTH: " << setw(7) << mon.mbpsBandwidth << "Mb/s " << endl;
cout << "BUFFERLEFT: SND: " << setw(11) << mon.byteAvailSndBuf << " RCV: " << setw(11) << mon.byteAvailRcvBuf << endl;
}
void SrtCommon::InitParameters(string host, map<string,string> par)
{
// Application-specific options: mode, blocking, timeout, adapter
if ( transmit_verbose )
{
cout << "Parameters:\n";
for (map<string,string>::iterator i = par.begin(); i != par.end(); ++i)
{
cout << "\t" << i->first << " = '" << i->second << "'\n";
}
}
m_mode = "default";
if ( par.count("mode") )
m_mode = par.at("mode");
if ( m_mode == "default" )
{
// Use the following convention:
// 1. Server for source, Client for target
// 2. If host is empty, then always server.
if ( host == "" )
m_mode = "listener";
//else if ( !dir_output )
//m_mode = "server";
else
m_mode = "caller";
}
if ( m_mode == "client" )
m_mode = "caller";
else if ( m_mode == "server" )
m_mode = "listener";
par.erase("mode");
if ( par.count("blocking") )
{
m_blocking_mode = !false_names.count(par.at("blocking"));
par.erase("blocking");
}
if ( par.count("timeout") )
{
m_timeout = stoi(par.at("timeout"), 0, 0);
par.erase("timeout");
}
if ( par.count("adapter") )
{
m_adapter = par.at("adapter");
par.erase("adapter");
}
else if (m_mode == "listener")
{
// For listener mode, adapter is taken from host,
// if 'adapter' parameter is not given
m_adapter = host;
}
if ( par.count("tsbpd") && false_names.count(par.at("tsbpd")) )
{
m_tsbpdmode = false;
}
if (par.count("port"))
{
m_outgoing_port = stoi(par.at("port"), 0, 0);
par.erase("port");
}
// That's kinda clumsy, but it must rely on the defaults.
// Default mode is live, so check if the file mode was enforced
if (par.count("transtype") == 0 || par["transtype"] != "file")
{
// If the Live chunk size was nondefault, enforce the size.
if (transmit_chunk_size != SRT_LIVE_DEF_PLSIZE)
{
if (transmit_chunk_size > SRT_LIVE_MAX_PLSIZE)
throw std::runtime_error("Chunk size in live mode exceeds 1456 bytes; this is not supported");
par["payloadsize"] = Sprint(transmit_chunk_size);
}
}
// Assign the others here.
m_options = par;
}
void SrtCommon::PrepareListener(string host, int port, int backlog)
{
m_bindsock = srt_socket(AF_INET, SOCK_DGRAM, 0);
if ( m_bindsock == SRT_ERROR )
Error(UDT::getlasterror(), "srt_socket");
int stat = ConfigurePre(m_bindsock);
if ( stat == SRT_ERROR )
Error(UDT::getlasterror(), "ConfigurePre");
if ( !m_blocking_mode )
{
srt_conn_epoll = AddPoller(m_bindsock, SRT_EPOLL_OUT);
}
sockaddr_in sa = CreateAddrInet(host, port);
sockaddr* psa = (sockaddr*)&sa;
if ( transmit_verbose )
{
cout << "Binding a server on " << host << ":" << port << " ...";
cout.flush();
}
stat = srt_bind(m_bindsock, psa, sizeof sa);
if ( stat == SRT_ERROR )
{
srt_close(m_bindsock);
Error(UDT::getlasterror(), "srt_bind");
}
if ( transmit_verbose )
{
cout << " listen... ";
cout.flush();
}
stat = srt_listen(m_bindsock, backlog);
if ( stat == SRT_ERROR )
{
srt_close(m_bindsock);
Error(UDT::getlasterror(), "srt_listen");
}
if ( transmit_verbose )
{
cout << " accept... ";
cout.flush();
}
::transmit_throw_on_interrupt = true;
if ( !m_blocking_mode )
{
if ( transmit_verbose )
cout << "[ASYNC] " << flush;
int len = 2;
SRTSOCKET ready[2];
if ( srt_epoll_wait(srt_conn_epoll, 0, 0, ready, &len, -1, 0, 0, 0, 0) == -1 )
Error(UDT::getlasterror(), "srt_epoll_wait");
if ( transmit_verbose )
{
cout << "[EPOLL: " << len << " sockets] " << flush;
}
}
}
void SrtCommon::StealFrom(SrtCommon& src)
{
// This is used when SrtCommon class designates a listener
// object that is doing Accept in appropriate direction class.
// The new object should get the accepted socket.
m_output_direction = src.m_output_direction;
m_blocking_mode = src.m_blocking_mode;
m_timeout = src.m_timeout;
m_tsbpdmode = src.m_tsbpdmode;
m_options = src.m_options;
m_bindsock = SRT_INVALID_SOCK; // no listener
m_sock = src.m_sock;
src.m_sock = SRT_INVALID_SOCK; // STEALING
}
void SrtCommon::AcceptNewClient()
{
sockaddr_in scl;
int sclen = sizeof scl;
m_sock = srt_accept(m_bindsock, (sockaddr*)&scl, &sclen);
if ( m_sock == SRT_INVALID_SOCK )
{
srt_close(m_bindsock);
Error(UDT::getlasterror(), "srt_accept");
}
if ( transmit_verbose )
cout << " connected.\n";
::transmit_throw_on_interrupt = false;
// ConfigurePre is done on bindsock, so any possible Pre flags
// are DERIVED by sock. ConfigurePost is done exclusively on sock.
int stat = ConfigurePost(m_sock);
if ( stat == SRT_ERROR )
Error(UDT::getlasterror(), "ConfigurePost");
}
void SrtCommon::Init(string host, int port, map<string,string> par, bool dir_output)
{
m_output_direction = dir_output;
InitParameters(host, par);
if ( transmit_verbose )
cout << "Opening SRT " << (dir_output ? "target" : "source") << " " << m_mode
<< "(" << (m_blocking_mode ? "" : "non-") << "blocking)"
<< " on " << host << ":" << port << endl;
if ( m_mode == "caller" )
OpenClient(host, port);
else if ( m_mode == "listener" )
OpenServer(m_adapter, port);
else if ( m_mode == "rendezvous" )
OpenRendezvous(m_adapter, host, port);
else
{
throw std::invalid_argument("Invalid 'mode'. Use 'client' or 'server'");
}
}
int SrtCommon::AddPoller(SRTSOCKET socket, int modes)
{
int pollid = srt_epoll_create();
if ( pollid == -1 )
throw std::runtime_error("Can't create epoll in nonblocking mode");
srt_epoll_add_usock(pollid, socket, &modes);
return pollid;
}
int SrtCommon::ConfigurePost(SRTSOCKET sock)
{
bool yes = m_blocking_mode;
int result = 0;
if ( m_output_direction )
{
result = srt_setsockopt(sock, 0, SRTO_SNDSYN, &yes, sizeof yes);
if ( result == -1 )
return result;
if ( m_timeout )
return srt_setsockopt(sock, 0, SRTO_SNDTIMEO, &m_timeout, sizeof m_timeout);
}
else
{
result = srt_setsockopt(sock, 0, SRTO_RCVSYN, &yes, sizeof yes);
if ( result == -1 )
return result;
if ( m_timeout )
return srt_setsockopt(sock, 0, SRTO_RCVTIMEO, &m_timeout, sizeof m_timeout);
}
SrtConfigurePost(sock, m_options);
for (auto o: srt_options)
{
if ( o.binding == SocketOption::POST && m_options.count(o.name) )
{
string value = m_options.at(o.name);
bool ok = o.apply<SocketOption::SRT>(sock, value);
if ( transmit_verbose )
{
if ( !ok )
cout << "WARNING: failed to set '" << o.name << "' (post, " << (m_output_direction? "target":"source") << ") to " << value << endl;
else
cout << "NOTE: SRT/post::" << o.name << "=" << value << endl;
}
}
}
return 0;
}
int SrtCommon::ConfigurePre(SRTSOCKET sock)
{
int result = 0;
int no = 0;
if ( !m_tsbpdmode )
{
result = srt_setsockopt(sock, 0, SRTO_TSBPDMODE, &no, sizeof no);
if ( result == -1 )
return result;
}
// Let's pretend async mode is set this way.
// This is for asynchronous connect.
int maybe = m_blocking_mode;
result = srt_setsockopt(sock, 0, SRTO_RCVSYN, &maybe, sizeof maybe);
if ( result == -1 )
return result;
//if ( m_timeout )
// result = srt_setsockopt(sock, 0, SRTO_RCVTIMEO, &m_timeout, sizeof m_timeout);
//if ( result == -1 )
// return result;
//if ( transmit_verbose )
//{
// cout << "PRE: blocking mode set: " << yes << " timeout " << m_timeout << endl;
//}
// host is only checked for emptiness and depending on that the connection mode is selected.
// Here we are not exactly interested with that information.
vector<string> failures;
// NOTE: here host = "", so the 'connmode' will be returned as LISTENER always,
// but it doesn't matter here. We don't use 'connmode' for anything else than
// checking for failures.
SocketOption::Mode conmode = SrtConfigurePre(sock, "", m_options, &failures);
if ( conmode == SocketOption::FAILURE )
{
if (transmit_verbose )
{
cout << "WARNING: failed to set options: ";
copy(failures.begin(), failures.end(), ostream_iterator<string>(cout, ", "));
cout << endl;
}
return SRT_ERROR;
}
return 0;
}
void SrtCommon::SetupAdapter(const string& host, int port)
{
sockaddr_in localsa = CreateAddrInet(host, port);
sockaddr* psa = (sockaddr*)&localsa;
int stat = srt_bind(m_sock, psa, sizeof localsa);
if ( stat == SRT_ERROR )
Error(UDT::getlasterror(), "srt_bind");
}
void SrtCommon::OpenClient(string host, int port)
{
PrepareClient();
if ( m_outgoing_port )
{
SetupAdapter("", m_outgoing_port);
}
ConnectClient(host, port);
}
void SrtCommon::PrepareClient()
{
m_sock = srt_socket(AF_INET, SOCK_DGRAM, 0);
if ( m_sock == SRT_ERROR )
Error(UDT::getlasterror(), "srt_socket");
int stat = ConfigurePre(m_sock);
if ( stat == SRT_ERROR )
Error(UDT::getlasterror(), "ConfigurePre");
if ( !m_blocking_mode )
{
srt_conn_epoll = AddPoller(m_sock, SRT_EPOLL_OUT);
}
}
/*
This may be used sometimes for testing, but it's nonportable.
void SrtCommon::SpinWaitAsync()
{
static string udt_status_names [] = {
"INIT" , "OPENED", "LISTENING", "CONNECTING", "CONNECTED", "BROKEN", "CLOSING", "CLOSED", "NONEXIST"
};
for (;;)
{
SRT_SOCKSTATUS state = srt_getsockstate(m_sock);
if ( int(state) < SRTS_CONNECTED )
{
if ( transmit_verbose )
cout << state << flush;
usleep(250000);
continue;
}
else if ( int(state) > SRTS_CONNECTED )
{
Error(UDT::getlasterror(), "UDT::connect status=" + udt_status_names[state]);
}
return;
}
}
*/
void SrtCommon::ConnectClient(string host, int port)
{
sockaddr_in sa = CreateAddrInet(host, port);
sockaddr* psa = (sockaddr*)&sa;
if ( transmit_verbose )
{
cout << "Connecting to " << host << ":" << port << " ... ";
cout.flush();
}
int stat = srt_connect(m_sock, psa, sizeof sa);
if ( stat == SRT_ERROR )
{
srt_close(m_sock);
Error(UDT::getlasterror(), "UDT::connect");
}
// Wait for REAL connected state if nonblocking mode
if ( !m_blocking_mode )
{
if ( transmit_verbose )
cout << "[ASYNC] " << flush;
// SPIN-WAITING version. Don't use it unless you know what you're doing.
// SpinWaitAsync();
// Socket readiness for connection is checked by polling on WRITE allowed sockets.
int len = 2;
SRTSOCKET ready[2];
if ( srt_epoll_wait(srt_conn_epoll, 0, 0, ready, &len, -1, 0, 0, 0, 0) != -1 )
{
if ( transmit_verbose )
{
cout << "[EPOLL: " << len << " sockets] " << flush;
}
}
else
{
Error(UDT::getlasterror(), "srt_epoll_wait");
}
}
if ( transmit_verbose )
cout << " connected.\n";
stat = ConfigurePost(m_sock);
if ( stat == SRT_ERROR )
Error(UDT::getlasterror(), "ConfigurePost");
}
void SrtCommon::Error(UDT::ERRORINFO& udtError, string src)
{
int udtResult = udtError.getErrorCode();
string message = udtError.getErrorMessage();
if ( transmit_verbose )
cout << "FAILURE\n" << src << ": [" << udtResult << "] " << message << endl;
else
cerr << "\nERROR #" << udtResult << ": " << message << endl;
udtError.clear();
throw TransmissionError("error: " + src + ": " + message);
}
void SrtCommon::OpenRendezvous(string adapter, string host, int port)
{
m_sock = srt_socket(AF_INET, SOCK_DGRAM, 0);
if ( m_sock == SRT_ERROR )
Error(UDT::getlasterror(), "srt_socket");
bool yes = true;
srt_setsockopt(m_sock, 0, SRTO_RENDEZVOUS, &yes, sizeof yes);
int stat = ConfigurePre(m_sock);
if ( stat == SRT_ERROR )
Error(UDT::getlasterror(), "ConfigurePre");
if ( !m_blocking_mode )
{
srt_conn_epoll = AddPoller(m_sock, SRT_EPOLL_OUT);
}
sockaddr_in localsa = CreateAddrInet(adapter, port);
sockaddr* plsa = (sockaddr*)&localsa;
if ( transmit_verbose )
{
cout << "Binding a server on " << adapter << ":" << port << " ...";
cout.flush();
}
stat = srt_bind(m_sock, plsa, sizeof localsa);
if ( stat == SRT_ERROR )
{
srt_close(m_sock);
Error(UDT::getlasterror(), "srt_bind");
}
sockaddr_in sa = CreateAddrInet(host, port);
sockaddr* psa = (sockaddr*)&sa;
if ( transmit_verbose )
{
cout << "Connecting to " << host << ":" << port << " ... ";
cout.flush();
}
stat = srt_connect(m_sock, psa, sizeof sa);
if ( stat == SRT_ERROR )
{
srt_close(m_sock);
Error(UDT::getlasterror(), "srt_connect");
}
// Wait for REAL connected state if nonblocking mode
if ( !m_blocking_mode )
{
if ( transmit_verbose )
cout << "[ASYNC] " << flush;
// SPIN-WAITING version. Don't use it unless you know what you're doing.
// SpinWaitAsync();
// Socket readiness for connection is checked by polling on WRITE allowed sockets.
int len = 2;
SRTSOCKET ready[2];
if ( srt_epoll_wait(srt_conn_epoll, 0, 0, ready, &len, -1, 0, 0, 0, 0) != -1 )
{
if ( transmit_verbose )
{
cout << "[EPOLL: " << len << " sockets] " << flush;
}
}
else
{
Error(UDT::getlasterror(), "srt_epoll_wait");
}
}
if ( transmit_verbose )
cout << " connected.\n";
stat = ConfigurePost(m_sock);
if ( stat == SRT_ERROR )
Error(UDT::getlasterror(), "ConfigurePost");
}
void SrtCommon::Close()
{
if ( transmit_verbose )
cout << "SrtCommon: DESTROYING CONNECTION, closing sockets (rt%" << m_sock << " ls%" << m_bindsock << ")...\n";
bool yes = true;
if ( m_sock != SRT_INVALID_SOCK )
{
srt_setsockflag(m_sock, SRTO_SNDSYN, &yes, sizeof yes);
srt_close(m_sock);
}
if ( m_bindsock != SRT_INVALID_SOCK )
{
// Set sndsynchro to the socket to synch-close it.
srt_setsockflag(m_bindsock, SRTO_SNDSYN, &yes, sizeof yes);
srt_close(m_bindsock);
}
if ( transmit_verbose )
cout << "SrtCommon: ... done.\n";
}
SrtCommon::~SrtCommon()
{
Close();
}
SrtSource::SrtSource(string host, int port, const map<string,string>& par)
{
Init(host, port, par, false);
if ( !m_blocking_mode )
{
srt_epoll = AddPoller(m_sock, SRT_EPOLL_IN);
}
ostringstream os;
os << host << ":" << port;
hostport_copy = os.str();
}
bytevector SrtSource::Read(size_t chunk)
{
static unsigned long counter = 1;
bytevector data(chunk);
bool ready = true;
int stat;
do
{
::transmit_throw_on_interrupt = true;
stat = srt_recvmsg(m_sock, data.data(), chunk);
::transmit_throw_on_interrupt = false;
if ( stat == SRT_ERROR )
{
if ( !m_blocking_mode )
{
// EAGAIN for SRT READING
if ( srt_getlasterror(NULL) == SRT_EASYNCRCV )
{
Verb() << "AGAIN: - waiting for data by epoll...";
// Poll on this descriptor until reading is available, indefinitely.
int len = 2;
SRTSOCKET sready[2];
if ( srt_epoll_wait(srt_epoll, sready, &len, 0, 0, -1, 0, 0, 0, 0) != -1 )
{
if ( transmit_verbose )
{
cout << "... epoll reported ready " << len << " sockets\n";
}
continue;
}
// If was -1, then passthru.
}
}
Error(UDT::getlasterror(), "recvmsg");
}
if ( stat == 0 )
{
throw ReadEOF(hostport_copy);
}
}
while (!ready);
chunk = size_t(stat);
if ( chunk < data.size() )
data.resize(chunk);
CBytePerfMon perf;
srt_bstats(m_sock, &perf, true);
if ( transmit_bw_report && (counter % transmit_bw_report) == transmit_bw_report - 1 )
{
cout << "+++/+++SRT BANDWIDTH: " << perf.mbpsBandwidth << endl;
}
if ( transmit_stats_report && (counter % transmit_stats_report) == transmit_stats_report - 1)
{
PrintSrtStats(m_sock, perf);
}
++counter;
return data;
}
int SrtTarget::ConfigurePre(SRTSOCKET sock)
{
int result = SrtCommon::ConfigurePre(sock);
if ( result == -1 )
return result;
int yes = 1;
// This is for the HSv4 compatibility; if both parties are HSv5
// (min. version 1.2.1), then this setting simply does nothing.
// In HSv4 this setting is obligatory; otherwise the SRT handshake
// extension will not be done at all.
result = srt_setsockopt(sock, 0, SRTO_SENDER, &yes, sizeof yes);
if ( result == -1 )
return result;
return 0;
}
void SrtTarget::Write(const bytevector& data)
{
static unsigned long counter = 1;
::transmit_throw_on_interrupt = true;
// Check first if it's ready to write.
// If not, wait indefinitely.
if ( !m_blocking_mode )
{
int ready[2];
int len = 2;
if ( srt_epoll_wait(srt_epoll, 0, 0, ready, &len, -1, 0, 0, 0, 0) == SRT_ERROR )
Error(UDT::getlasterror(), "srt_epoll_wait");
}
int stat = srt_sendmsg2(m_sock, data.data(), data.size(), nullptr);
if ( stat == SRT_ERROR )
Error(UDT::getlasterror(), "srt_sendmsg");
CBytePerfMon perf;
srt_bstats(m_sock, &perf, true);
if ( transmit_bw_report && (counter % transmit_bw_report) == transmit_bw_report - 1 )
{
cout << "+++/+++SRT BANDWIDTH: " << perf.mbpsBandwidth << endl;
}
if ( transmit_stats_report && (counter % transmit_stats_report) == transmit_stats_report - 1)
{
PrintSrtStats(m_sock, perf);
}
++counter;
::transmit_throw_on_interrupt = false;
}
SrtModel::SrtModel(string host, int port, map<string,string> par)
{
InitParameters(host, par);
if (m_mode == "caller")
is_caller = true;
else if (m_mode != "listener")
throw std::invalid_argument("Only caller and listener modes supported");
m_host = host;
m_port = port;
}
void SrtModel::Establish(ref_t<std::string> name)
{
// This does connect or accept.
// When this returned true, the caller should create
// a new SrtSource or SrtTaget then call StealFrom(*this) on it.
// If this is a connector and the peer doesn't have a corresponding
// medium, it should send back a single byte with value 0. This means
// that agent should stop connecting.
if (is_caller)
{
// Establish a connection
PrepareClient();
if (name.get() != "")
{
Verb() << "Connect with requesting stream [" << name.get() << "]";
UDT::setstreamid(m_sock, *name);
}
else
{
Verb() << "NO STREAM ID for SRT connection";
}
if (m_outgoing_port)
{
Verb() << "Setting outgoing port: " << m_outgoing_port;
SetupAdapter("", m_outgoing_port);
}
ConnectClient(m_host, m_port);
if (m_outgoing_port == 0)
{
// Must rely on a randomly selected one. Extract the port
// so that it will be reused next time.
sockaddr_any s(AF_INET);
int namelen = s.size();
if ( srt_getsockname(Socket(), &s, &namelen) == SRT_ERROR )
{
Error(UDT::getlasterror(), "srt_getsockname");
}
m_outgoing_port = s.hport();
Verb() << "Extracted outgoing port: " << m_outgoing_port;
}
}
else
{
// Listener - get a socket by accepting.
// Check if the listener is already created first
if (Listener() == SRT_INVALID_SOCK)
{
Verb() << "Setting up listener: port=" << m_port << " backlog=5";
PrepareListener(m_adapter, m_port, 5);
}
Verb() << "Accepting a client...";
AcceptNewClient();
// This rewrites m_sock with a new SRT socket ("accepted" socket)
*name = UDT::getstreamid(m_sock);
Verb() << "... GOT CLIENT for stream [" << name.get() << "]";
}
}
template <class Iface> struct Srt;
template <> struct Srt<Source> { typedef SrtSource type; };
template <> struct Srt<Target> { typedef SrtTarget type; };
template <class Iface>
Iface* CreateSrt(const string& host, int port, const map<string,string>& par) { return new typename Srt<Iface>::type (host, port, par); }
class ConsoleSource: public Source
{
public:
ConsoleSource()
{
}
bytevector Read(size_t chunk) override
{
bytevector data(chunk);
bool st = cin.read(data.data(), chunk).good();
chunk = cin.gcount();
if ( chunk == 0 && !st )
return bytevector();
if ( chunk < data.size() )
data.resize(chunk);
if ( data.empty() )
throw ReadEOF("CONSOLE device");
return data;
}
bool IsOpen() override { return cin.good(); }
bool End() override { return cin.eof(); }
};
class ConsoleTarget: public Target
{
public:
ConsoleTarget()
{
}
void Write(const bytevector& data) override
{
cout.write(data.data(), data.size());
}
bool IsOpen() override { return cout.good(); }
bool Broken() override { return cout.eof(); }
};
template <class Iface> struct Console;
template <> struct Console<Source> { typedef ConsoleSource type; };
template <> struct Console<Target> { typedef ConsoleTarget type; };
template <class Iface>
Iface* CreateConsole() { return new typename Console<Iface>::type (); }
// More options can be added in future.
SocketOption udp_options [] {
{ "iptos", IPPROTO_IP, IP_TOS, SocketOption::PRE, SocketOption::INT, nullptr },
// IP_TTL and IP_MULTICAST_TTL are handled separately by a common option, "ttl".
{ "mcloop", IPPROTO_IP, IP_MULTICAST_LOOP, SocketOption::PRE, SocketOption::INT, nullptr }
};
static inline bool IsMulticast(in_addr adr)
{
unsigned char* abytes = (unsigned char*)&adr.s_addr;
unsigned char c = abytes[0];
return c >= 224 && c <= 239;
}
class UdpCommon
{
protected:
int m_sock = -1;
sockaddr_in sadr;
string adapter;
map<string, string> m_options;
void Setup(string host, int port, map<string,string> attr)
{
m_sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (m_sock == -1)
Error(SysError(), "UdpCommon::Setup: socket");
int yes = 1;
::setsockopt(m_sock, SOL_SOCKET, SO_REUSEADDR, (const char*)&yes, sizeof yes);
sadr = CreateAddrInet(host, port);
bool is_multicast = false;
if ( attr.count("multicast") )
{
if (!IsMulticast(sadr.sin_addr))
{
throw std::runtime_error("UdpCommon: requested multicast for a non-multicast-type IP address");
}
is_multicast = true;
}
else if (IsMulticast(sadr.sin_addr))
{
is_multicast = true;
}
if (is_multicast)
{
adapter = attr.count("adapter") ? attr.at("adapter") : string();
sockaddr_in maddr;
if ( adapter == "" )
{
Verb() << "Multicast: home address: INADDR_ANY:" << port;
maddr.sin_family = AF_INET;
maddr.sin_addr.s_addr = htonl(INADDR_ANY);
maddr.sin_port = htons(port); // necessary for temporary use
}
else
{
Verb() << "Multicast: home address: " << adapter << ":" << port;
maddr = CreateAddrInet(adapter, port);
}
ip_mreq mreq;
mreq.imr_multiaddr.s_addr = sadr.sin_addr.s_addr;
mreq.imr_interface.s_addr = maddr.sin_addr.s_addr;
#ifdef WIN32