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transmitmedia.cpp
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/*
* SRT - Secure, Reliable, Transport
* Copyright (c) 2018 Haivision Systems Inc.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
*/
// Just for formality. This file should be used
#include <iostream>
#include <iomanip>
#include <fstream>
#include <sstream>
#include <memory>
#include <string>
#include <stdexcept>
#include <iterator>
#include <map>
#include <srt.h>
#if !defined(_WIN32)
#include <sys/ioctl.h>
#else
#include <fcntl.h>
#include <io.h>
#endif
#include "netinet_any.h"
#include "apputil.hpp"
#include "socketoptions.hpp"
#include "uriparser.hpp"
#include "transmitmedia.hpp"
#include "srt_compat.h"
#include "verbose.hpp"
using namespace std;
bool g_stats_are_printed_to_stdout = false;
bool transmit_total_stats = false;
unsigned long transmit_bw_report = 0;
unsigned long transmit_stats_report = 0;
unsigned long transmit_chunk_size = SRT_LIVE_MAX_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");
}
int Read(size_t chunk, MediaPacket& pkt, ostream & ignored SRT_ATR_UNUSED = cout) override
{
if (pkt.payload.size() < chunk)
pkt.payload.resize(chunk);
pkt.time = 0;
ifile.read(pkt.payload.data(), chunk);
size_t nread = ifile.gcount();
if (nread < pkt.payload.size())
pkt.payload.resize(nread);
if (pkt.payload.empty())
{
return 0;
}
return (int) nread;
}
bool IsOpen() override { return bool(ifile); }
bool End() override { return ifile.eof(); }
};
class FileTarget: public Target
{
ofstream ofile;
public:
FileTarget(const string& path): ofile(path, ios::out | ios::trunc | ios::binary) {}
int Write(const char* data, size_t size, int64_t time SRT_ATR_UNUSED, ostream & ignored SRT_ATR_UNUSED = cout) override
{
ofile.write(data, size);
return !(ofile.bad()) ? (int) size : 0;
}
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); }
shared_ptr<SrtStatsWriter> transmit_stats_writer;
void SrtCommon::InitParameters(string host, map<string,string> par)
{
// Application-specific options: mode, blocking, timeout, adapter
if (Verbose::on && !par.empty())
{
Verb() << "SRT parameters specified:\n";
for (map<string,string>::iterator i = par.begin(); i != par.end(); ++i)
{
cerr << "\t" << i->first << " = '" << i->second << "'\n";
}
}
string adapter;
if (par.count("adapter"))
{
adapter = par.at("adapter");
}
m_mode = "default";
if (par.count("mode"))
{
m_mode = par.at("mode");
}
SocketOption::Mode mode = SrtInterpretMode(m_mode, host, adapter);
if (mode == SocketOption::FAILURE)
{
Error("Invalid mode");
}
// Fix the mode name after successful interpretation
m_mode = SocketOption::mode_names[mode];
par.erase("mode");
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")
&& 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_create_socket();
if ( m_bindsock == SRT_ERROR )
Error("srt_create_socket");
int stat = ConfigurePre(m_bindsock);
if ( stat == SRT_ERROR )
Error("ConfigurePre");
sockaddr_any sa = CreateAddr(host, port);
sockaddr* psa = sa.get();
Verb() << "Binding a server on " << host << ":" << port << " ...";
stat = srt_bind(m_bindsock, psa, sizeof sa);
if ( stat == SRT_ERROR )
{
srt_close(m_bindsock);
Error("srt_bind");
}
Verb() << " listen...";
stat = srt_listen(m_bindsock, backlog);
if ( stat == SRT_ERROR )
{
srt_close(m_bindsock);
Error("srt_listen");
}
}
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_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
}
bool SrtCommon::AcceptNewClient()
{
sockaddr_any scl;
Verb() << " accept... ";
m_sock = srt_accept(m_bindsock, scl.get(), &scl.len);
if ( m_sock == SRT_INVALID_SOCK )
{
srt_close(m_bindsock);
m_bindsock = SRT_INVALID_SOCK;
Error("srt_accept");
}
// we do one client connection at a time,
// so close the listener.
srt_close(m_bindsock);
m_bindsock = SRT_INVALID_SOCK;
Verb() << " connected.";
// 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("ConfigurePost");
return true;
}
void SrtCommon::Init(string host, int port, map<string,string> par, bool dir_output)
{
m_output_direction = dir_output;
InitParameters(host, par);
Verb() << "Opening SRT " << (dir_output ? "target" : "source") << " " << m_mode
<< " on " << host << ":" << port;
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::ConfigurePost(SRTSOCKET sock)
{
bool no = false;
int result = 0;
if ( m_output_direction )
{
result = srt_setsockopt(sock, 0, SRTO_SNDSYN, &no, sizeof no);
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, &no, sizeof no);
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 ( !ok )
Verb() << "WARNING: failed to set '" << o.name << "' (post, "
<< (m_output_direction? "target":"source") << ") to "
<< value;
else
Verb() << "NOTE: SRT/post::" << o.name << "=" << value;
}
}
return 0;
}
int SrtCommon::ConfigurePre(SRTSOCKET sock)
{
int result = 0;
bool no = false;
if ( !m_tsbpdmode )
{
result = srt_setsockopt(sock, 0, SRTO_TSBPDMODE, &no, sizeof no);
if ( result == -1 )
return result;
}
result = srt_setsockopt(sock, 0, SRTO_RCVSYN, &no, sizeof no);
if ( result == -1 )
return result;
// 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 ( Verbose::on )
{
cerr << "WARNING: failed to set options: ";
copy(failures.begin(), failures.end(), ostream_iterator<string>(cerr, ", "));
cerr << endl;
}
return SRT_ERROR;
}
return 0;
}
void SrtCommon::SetupAdapter(const string& host, int port)
{
sockaddr_any localsa = CreateAddr(host, port);
sockaddr* psa = localsa.get();
int stat = srt_bind(m_sock, psa, sizeof localsa);
if ( stat == SRT_ERROR )
Error("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_create_socket();
if ( m_sock == SRT_ERROR )
Error("srt_create_socket");
int stat = ConfigurePre(m_sock);
if ( stat == SRT_ERROR )
Error("ConfigurePre");
}
void SrtCommon::ConnectClient(string host, int port)
{
sockaddr_any sa = CreateAddr(host, port);
sockaddr* psa = sa.get();
Verb() << "Connecting to " << host << ":" << port;
int stat = srt_connect(m_sock, psa, sizeof sa);
if ( stat == SRT_ERROR )
{
srt_close(m_sock);
Error("srt_connect");
}
stat = ConfigurePost(m_sock);
if ( stat == SRT_ERROR )
Error("ConfigurePost");
}
void SrtCommon::Error(string src)
{
int errnov = 0;
int result = srt_getlasterror(&errnov);
string message = srt_getlasterror_str();
Verb() << "\nERROR #" << result << "." << errnov << ": " << message;
throw TransmissionError("error: " + src + ": " + message);
}
void SrtCommon::OpenRendezvous(string adapter, string host, int port)
{
m_sock = srt_create_socket();
if ( m_sock == SRT_ERROR )
Error("srt_create_socket");
bool yes = true;
srt_setsockopt(m_sock, 0, SRTO_RENDEZVOUS, &yes, sizeof yes);
int stat = ConfigurePre(m_sock);
if ( stat == SRT_ERROR )
Error("ConfigurePre");
sockaddr_any sa = CreateAddr(host, port);
if (sa.family() == AF_UNSPEC)
{
Error("OpenRendezvous: invalid target host specification: " + host);
}
const int outport = m_outgoing_port ? m_outgoing_port : port;
sockaddr_any localsa = CreateAddr(adapter, outport, sa.family());
Verb() << "Binding a server on " << adapter << ":" << outport;
stat = srt_bind(m_sock, localsa.get(), sizeof localsa);
if ( stat == SRT_ERROR )
{
srt_close(m_sock);
Error("srt_bind");
}
Verb() << "Connecting to " << host << ":" << port;
stat = srt_connect(m_sock, sa.get(), sizeof sa);
if ( stat == SRT_ERROR )
{
srt_close(m_sock);
Error("srt_connect");
}
stat = ConfigurePost(m_sock);
if ( stat == SRT_ERROR )
Error("ConfigurePost");
}
void SrtCommon::Close()
{
Verb() << "SrtCommon: DESTROYING CONNECTION, closing sockets (rt%" << m_sock << " ls%" << m_bindsock << ")...";
if ( m_sock != SRT_INVALID_SOCK )
{
srt_close(m_sock);
m_sock = SRT_INVALID_SOCK;
}
if ( m_bindsock != SRT_INVALID_SOCK )
{
srt_close(m_bindsock);
m_bindsock = SRT_INVALID_SOCK ;
}
Verb() << "SrtCommon: ... done.";
}
SrtCommon::~SrtCommon()
{
Close();
}
SrtSource::SrtSource(string host, int port, const map<string,string>& par)
{
Init(host, port, par, false);
ostringstream os;
os << host << ":" << port;
hostport_copy = os.str();
}
int SrtSource::Read(size_t chunk, MediaPacket& pkt, ostream &out_stats)
{
static unsigned long counter = 1;
if (pkt.payload.size() < chunk)
pkt.payload.resize(chunk);
SRT_MSGCTRL ctrl;
const int stat = srt_recvmsg2(m_sock, pkt.payload.data(), (int) chunk, &ctrl);
if (stat <= 0)
{
pkt.payload.clear();
return stat;
}
pkt.time = ctrl.srctime;
chunk = size_t(stat);
if (chunk < pkt.payload.size())
pkt.payload.resize(chunk);
const bool need_bw_report = transmit_bw_report && (counter % transmit_bw_report) == transmit_bw_report - 1;
const bool need_stats_report = transmit_stats_report && (counter % transmit_stats_report) == transmit_stats_report - 1;
if (need_bw_report || need_stats_report)
{
CBytePerfMon perf;
srt_bstats(m_sock, &perf, need_stats_report && !transmit_total_stats);
if (transmit_stats_writer != nullptr)
{
if (need_bw_report)
cerr << transmit_stats_writer->WriteBandwidth(perf.mbpsBandwidth) << std::flush;
if (need_stats_report)
out_stats << transmit_stats_writer->WriteStats(m_sock, perf) << std::flush;
}
}
++counter;
return stat;
}
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;
}
int SrtTarget::Write(const char* data, size_t size, int64_t src_time, ostream &out_stats)
{
static unsigned long counter = 1;
SRT_MSGCTRL ctrl = srt_msgctrl_default;
ctrl.srctime = src_time;
int stat = srt_sendmsg2(m_sock, data, (int) size, &ctrl);
if (stat == SRT_ERROR)
{
return stat;
}
const bool need_bw_report = transmit_bw_report && (counter % transmit_bw_report) == transmit_bw_report - 1;
const bool need_stats_report = transmit_stats_report && (counter % transmit_stats_report) == transmit_stats_report - 1;
if (need_bw_report || need_stats_report)
{
CBytePerfMon perf;
srt_bstats(m_sock, &perf, need_stats_report && !transmit_total_stats);
if (transmit_stats_writer != nullptr)
{
if (need_bw_report)
cerr << transmit_stats_writer->WriteBandwidth(perf.mbpsBandwidth) << std::flush;
if (need_stats_report)
out_stats << transmit_stats_writer->WriteStats(m_sock, perf) << std::flush;
}
}
++counter;
return stat;
}
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(std::string& w_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 (w_name != "")
{
Verb() << "Connect with requesting stream [" << w_name << "]";
UDT::setstreamid(m_sock, w_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.get(), &namelen) == SRT_ERROR )
{
Error("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)
w_name = UDT::getstreamid(m_sock);
Verb() << "... GOT CLIENT for stream [" << w_name << "]";
}
}
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()
{
#ifdef _WIN32
// The default stdin mode on windows is text.
// We have to set it to the binary mode
_setmode(_fileno(stdin), _O_BINARY);
#endif
}
int Read(size_t chunk, MediaPacket& pkt, ostream & ignored SRT_ATR_UNUSED = cout) override
{
if (pkt.payload.size() < chunk)
pkt.payload.resize(chunk);
bool st = cin.read(pkt.payload.data(), chunk).good();
chunk = cin.gcount();
if (chunk == 0 || !st)
{
pkt.payload.clear();
return 0;
}
// Save this time to potentially use it for SRT target.
pkt.time = srt_time_now();
if (chunk < pkt.payload.size())
pkt.payload.resize(chunk);
return (int) chunk;
}
bool IsOpen() override { return cin.good(); }
bool End() override { return cin.eof(); }
int GetSysSocket() const override { return 0; };
};
class ConsoleTarget: public Target
{
public:
ConsoleTarget()
{
#ifdef _WIN32
// The default stdout mode on windows is text.
// We have to set it to the binary mode
_setmode(_fileno(stdout), _O_BINARY);
#endif
}
virtual ~ConsoleTarget()
{
cout.flush();
}
int Write(const char* data, size_t len, int64_t src_time SRT_ATR_UNUSED, ostream & ignored SRT_ATR_UNUSED = cout) override
{
cout.write(data, len);
return (int) len;
}
bool IsOpen() override { return cout.good(); }
bool Broken() override { return cout.eof(); }
int GetSysSocket() const override { return 0; };
};
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 },
{ "sndbuf", SOL_SOCKET, SO_SNDBUF, SocketOption::PRE, SocketOption::INT, nullptr},
{ "rcvbuf", SOL_SOCKET, SO_RCVBUF, 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_any 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);
// set non-blocking mode
#if defined(_WIN32)
unsigned long ulyes = 1;
if (ioctlsocket(m_sock, FIONBIO, &ulyes) == SOCKET_ERROR)
#else
if (ioctl(m_sock, FIONBIO, (const char *)&yes) < 0)
#endif
{
Error(SysError(), "UdpCommon::Setup: ioctl FIONBIO");
}
sadr = CreateAddr(host, port);
bool is_multicast = false;
if (attr.count("multicast"))
{
// XXX: Here provide support for IPv6 multicast #1479
if (sadr.family() != AF_INET)
{
throw std::runtime_error("UdpCommon: Multicast on IPv6 is not yet supported");
}
if (!IsMulticast(sadr.sin.sin_addr))
{
throw std::runtime_error("UdpCommon: requested multicast for a non-multicast-type IP address");
}
is_multicast = true;
}
else if (sadr.family() == AF_INET && IsMulticast(sadr.sin.sin_addr))
{
is_multicast = true;
}
if (is_multicast)
{
ip_mreq_source mreq_ssm;
ip_mreq mreq;
sockaddr_any maddr (AF_INET);
int opt_name;
void* mreq_arg_ptr;
socklen_t mreq_arg_size;
adapter = attr.count("adapter") ? attr.at("adapter") : string();
if ( adapter == "" )
{
Verb() << "Multicast: home address: INADDR_ANY:" << port;
maddr.sin.sin_family = AF_INET;
maddr.sin.sin_addr.s_addr = htonl(INADDR_ANY);
maddr.sin.sin_port = htons(port); // necessary for temporary use
}
else
{
Verb() << "Multicast: home address: " << adapter << ":" << port;
maddr = CreateAddr(adapter, port);
}
if (attr.count("source"))
{
#ifdef IP_ADD_SOURCE_MEMBERSHIP
/* this is an ssm. we need to use the right struct and opt */
opt_name = IP_ADD_SOURCE_MEMBERSHIP;
mreq_ssm.imr_multiaddr.s_addr = sadr.sin.sin_addr.s_addr;
mreq_ssm.imr_interface.s_addr = maddr.sin.sin_addr.s_addr;
inet_pton(AF_INET, attr.at("source").c_str(), &mreq_ssm.imr_sourceaddr);
mreq_arg_size = sizeof(mreq_ssm);
mreq_arg_ptr = &mreq_ssm;
#else
throw std::runtime_error("UdpCommon: source-filter multicast not supported by OS");
#endif
}
else
{
opt_name = IP_ADD_MEMBERSHIP;
mreq.imr_multiaddr.s_addr = sadr.sin.sin_addr.s_addr;
mreq.imr_interface.s_addr = maddr.sin.sin_addr.s_addr;
mreq_arg_size = sizeof(mreq);
mreq_arg_ptr = &mreq;
}
#ifdef _WIN32
const char* mreq_arg = (const char*)mreq_arg_ptr;
const auto status_error = SOCKET_ERROR;
#else
const void* mreq_arg = mreq_arg_ptr;
const auto status_error = -1;
#endif
#if defined(_WIN32) || defined(__CYGWIN__)
// On Windows it somehow doesn't work when bind()
// is called with multicast address. Write the address
// that designates the network device here.
// Also, sets port sharing when working with multicast
sadr = maddr;
int reuse = 1;
int shareAddrRes = setsockopt(m_sock, SOL_SOCKET, SO_REUSEADDR, reinterpret_cast<const char*>(&reuse), sizeof(reuse));
if (shareAddrRes == status_error)
{
throw runtime_error("marking socket for shared use failed");
}
Verb() << "Multicast(Windows): will bind to home address";
#else
Verb() << "Multicast(POSIX): will bind to IGMP address: " << host;
#endif
int res = setsockopt(m_sock, IPPROTO_IP, opt_name, mreq_arg, mreq_arg_size);
if ( res == status_error )
{
Error(errno, "adding to multicast membership failed");
}
attr.erase("multicast");
attr.erase("adapter");
}
// The "ttl" options is handled separately, it maps to both IP_TTL
// and IP_MULTICAST_TTL so that TTL setting works for both uni- and multicast.
if (attr.count("ttl"))
{
int ttl = stoi(attr.at("ttl"));
int res = setsockopt(m_sock, IPPROTO_IP, IP_TTL, (const char*)&ttl, sizeof ttl);
if (res == -1)
Verb() << "WARNING: failed to set 'ttl' (IP_TTL) to " << ttl;
res = setsockopt(m_sock, IPPROTO_IP, IP_MULTICAST_TTL, (const char*)&ttl, sizeof ttl);
if (res == -1)
Verb() << "WARNING: failed to set 'ttl' (IP_MULTICAST_TTL) to " << ttl;
attr.erase("ttl");
}
m_options = attr;
for (auto o: udp_options)
{
// Ignore "binding" - for UDP there are no post options.
if ( m_options.count(o.name) )
{
string value = m_options.at(o.name);
bool ok = o.apply<SocketOption::SYSTEM>(m_sock, value);
if ( !ok )
Verb() << "WARNING: failed to set '" << o.name << "' to " << value;
}
}
}
void Error(int err, string src)
{
char buf[512];
string message = SysStrError(err, buf, 512u);
cerr << "\nERROR #" << err << ": " << message << endl;
throw TransmissionError("error: " + src + ": " + message);
}
~UdpCommon()
{
#ifdef _WIN32
if (m_sock != -1)
{
shutdown(m_sock, SD_BOTH);
closesocket(m_sock);
m_sock = -1;
}
#else
close(m_sock);
#endif
}
};
class UdpSource: public Source, public UdpCommon
{
bool eof = true;
public:
UdpSource(string host, int port, const map<string,string>& attr)
{
Setup(host, port, attr);
int stat = ::bind(m_sock, sadr.get(), sadr.size());
if ( stat == -1 )
Error(SysError(), "Binding address for UDP");
eof = false;
}
int Read(size_t chunk, MediaPacket& pkt, ostream & ignored SRT_ATR_UNUSED = cout) override
{
if (pkt.payload.size() < chunk)
pkt.payload.resize(chunk);
sockaddr_any sa(sadr.family());
socklen_t si = sa.size();
int stat = recvfrom(m_sock, pkt.payload.data(), (int) chunk, 0, sa.get(), &si);
if (stat < 1)
{
if (SysError() != EWOULDBLOCK)
eof = true;
pkt.payload.clear();
return stat;
}
sa.len = si;
// Save this time to potentially use it for SRT target.
pkt.time = srt_time_now();
chunk = size_t(stat);
if (chunk < pkt.payload.size())
pkt.payload.resize(chunk);