/* * 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/. * */ /***************************************************************************** written by Haivision Systems Inc. *****************************************************************************/ #ifndef INC__SRTC_H #define INC__SRTC_H #include "version.h" #include "platform_sys.h" #include #include #include "srt4udt.h" #include "logging_api.h" //////////////////////////////////////////////////////////////////////////////// //if compiling on VC6.0 or pre-WindowsXP systems //use -DLEGACY_WIN32 //if compiling with MinGW, it only works on XP or above //use -D_WIN32_WINNT=0x0501 #ifdef _WIN32 #ifndef __MINGW__ // Explicitly define 32-bit and 64-bit numbers typedef __int32 int32_t; typedef __int64 int64_t; typedef unsigned __int32 uint32_t; #ifndef LEGACY_WIN32 typedef unsigned __int64 uint64_t; #else // VC 6.0 does not support unsigned __int64: may cause potential problems. typedef __int64 uint64_t; #endif #ifdef SRT_DYNAMIC #ifdef SRT_EXPORTS #define SRT_API __declspec(dllexport) #else #define SRT_API __declspec(dllimport) #endif #else #define SRT_API #endif #else // __MINGW__ #define SRT_API #endif #else #define SRT_API __attribute__ ((visibility("default"))) #endif // For feature tests if you need. // You can use these constants with SRTO_MINVERSION option. #define SRT_VERSION_FEAT_HSv5 0x010300 // When compiling in C++17 mode, use the standard C++17 attributes // (out of these, only [[deprecated]] is supported in C++14, so // for all lesser standard use compiler-specific attributes). #if defined(SRT_NO_DEPRECATED) #define SRT_ATR_UNUSED #define SRT_ATR_DEPRECATED #define SRT_ATR_NODISCARD #elif defined(__cplusplus) && __cplusplus > 201406 #define SRT_ATR_UNUSED [[maybe_unused]] #define SRT_ATR_DEPRECATED [[deprecated]] #define SRT_ATR_NODISCARD [[nodiscard]] // GNUG is GNU C/C++; this syntax is also supported by Clang #elif defined( __GNUC__) #define SRT_ATR_UNUSED __attribute__((unused)) #define SRT_ATR_DEPRECATED __attribute__((deprecated)) #define SRT_ATR_NODISCARD __attribute__((warn_unused_result)) #else #define SRT_ATR_UNUSED #define SRT_ATR_DEPRECATED #define SRT_ATR_NODISCARD #endif #ifdef __cplusplus extern "C" { #endif typedef int SRTSOCKET; // SRTSOCKET is a typedef to int anyway, and it's not even in UDT namespace :) #ifdef _WIN32 #ifndef __MINGW__ typedef SOCKET SYSSOCKET; #else typedef int SYSSOCKET; #endif #else typedef int SYSSOCKET; #endif typedef SYSSOCKET UDPSOCKET; // Values returned by srt_getsockstate() typedef enum SRT_SOCKSTATUS { SRTS_INIT = 1, SRTS_OPENED, SRTS_LISTENING, SRTS_CONNECTING, SRTS_CONNECTED, SRTS_BROKEN, SRTS_CLOSING, SRTS_CLOSED, SRTS_NONEXIST } SRT_SOCKSTATUS; // This is a duplicate enum. Must be kept in sync with the original UDT enum for // backward compatibility until all compat is destroyed. typedef enum SRT_SOCKOPT { SRTO_MSS = 0, // the Maximum Transfer Unit SRTO_SNDSYN = 1, // if sending is blocking SRTO_RCVSYN = 2, // if receiving is blocking SRTO_ISN = 3, // Initial Sequence Number (valid only after srt_connect or srt_accept-ed sockets) SRTO_FC = 4, // Flight flag size (window size) SRTO_SNDBUF = 5, // maximum buffer in sending queue SRTO_RCVBUF = 6, // UDT receiving buffer size SRTO_LINGER = 7, // waiting for unsent data when closing SRTO_UDP_SNDBUF = 8, // UDP sending buffer size SRTO_UDP_RCVBUF = 9, // UDP receiving buffer size // XXX Free space for 2 options // after deprecated ones are removed SRTO_RENDEZVOUS = 12, // rendezvous connection mode SRTO_SNDTIMEO = 13, // send() timeout SRTO_RCVTIMEO = 14, // recv() timeout SRTO_REUSEADDR = 15, // reuse an existing port or create a new one SRTO_MAXBW = 16, // maximum bandwidth (bytes per second) that the connection can use SRTO_STATE = 17, // current socket state, see UDTSTATUS, read only SRTO_EVENT = 18, // current available events associated with the socket SRTO_SNDDATA = 19, // size of data in the sending buffer SRTO_RCVDATA = 20, // size of data available for recv SRTO_SENDER = 21, // Sender mode (independent of conn mode), for encryption, tsbpd handshake. SRTO_TSBPDMODE = 22, // Enable/Disable TsbPd. Enable -> Tx set origin timestamp, Rx deliver packet at origin time + delay SRTO_LATENCY = 23, // NOT RECOMMENDED. SET: to both SRTO_RCVLATENCY and SRTO_PEERLATENCY. GET: same as SRTO_RCVLATENCY. SRTO_TSBPDDELAY = 23, // DEPRECATED. ALIAS: SRTO_LATENCY SRTO_INPUTBW = 24, // Estimated input stream rate. SRTO_OHEADBW, // MaxBW ceiling based on % over input stream rate. Applies when UDT_MAXBW=0 (auto). SRTO_PASSPHRASE = 26, // Crypto PBKDF2 Passphrase size[0,10..64] 0:disable crypto SRTO_PBKEYLEN, // Crypto key len in bytes {16,24,32} Default: 16 (128-bit) SRTO_KMSTATE, // Key Material exchange status (UDT_SRTKmState) SRTO_IPTTL = 29, // IP Time To Live (passthru for system sockopt IPPROTO_IP/IP_TTL) SRTO_IPTOS, // IP Type of Service (passthru for system sockopt IPPROTO_IP/IP_TOS) SRTO_TLPKTDROP = 31, // Enable receiver pkt drop SRTO_SNDDROPDELAY = 32, // Extra delay towards latency for sender TLPKTDROP decision (-1 to off) SRTO_NAKREPORT = 33, // Enable receiver to send periodic NAK reports SRTO_VERSION = 34, // Local SRT Version SRTO_PEERVERSION, // Peer SRT Version (from SRT Handshake) SRTO_CONNTIMEO = 36, // Connect timeout in msec. Ccaller default: 3000, rendezvous (x 10) // deprecated: SRTO_TWOWAYDATA, SRTO_SNDPBKEYLEN, SRTO_RCVPBKEYLEN (@c below) _DEPRECATED_SRTO_SNDPBKEYLEN = 38, // (needed to use inside the code without generating -Wswitch) // SRTO_SNDKMSTATE = 40, // (GET) the current state of the encryption at the peer side SRTO_RCVKMSTATE, // (GET) the current state of the encryption at the agent side SRTO_LOSSMAXTTL, // Maximum possible packet reorder tolerance (number of packets to receive after loss to send lossreport) SRTO_RCVLATENCY, // TsbPd receiver delay (mSec) to absorb burst of missed packet retransmission SRTO_PEERLATENCY, // Minimum value of the TsbPd receiver delay (mSec) for the opposite side (peer) SRTO_MINVERSION, // Minimum SRT version needed for the peer (peers with less version will get connection reject) SRTO_STREAMID, // A string set to a socket and passed to the listener's accepted socket SRTO_CONGESTION, // Congestion controller type selection SRTO_MESSAGEAPI, // In File mode, use message API (portions of data with boundaries) SRTO_PAYLOADSIZE, // Maximum payload size sent in one UDP packet (0 if unlimited) SRTO_TRANSTYPE = 50, // Transmission type (set of options required for given transmission type) SRTO_KMREFRESHRATE, // After sending how many packets the encryption key should be flipped to the new key SRTO_KMPREANNOUNCE, // How many packets before key flip the new key is annnounced and after key flip the old one decommissioned SRTO_ENFORCEDENCRYPTION, // Connection to be rejected or quickly broken when one side encryption set or bad password SRTO_IPV6ONLY, // IPV6_V6ONLY mode SRTO_PEERIDLETIMEO, // Peer-idle timeout (max time of silence heard from peer) in [ms] // (some space left) SRTO_PACKETFILTER = 60 // Add and configure a packet filter } SRT_SOCKOPT; #ifdef __cplusplus typedef SRT_ATR_DEPRECATED SRT_SOCKOPT SRT_SOCKOPT_DEPRECATED; #define SRT_DEPRECATED_OPTION(value) ((SRT_SOCKOPT_DEPRECATED)value) #else // deprecated enum labels are supported only since gcc 6, so in C there // will be a whole deprecated enum type, as it's not an error in C to mix // enum types enum SRT_ATR_DEPRECATED SRT_SOCKOPT_DEPRECATED { // Dummy last option, as every entry ends with a comma SRTO_DEPRECATED_END = 0 }; #define SRT_DEPRECATED_OPTION(value) ((enum SRT_SOCKOPT_DEPRECATED)value) #endif // DEPRECATED OPTIONS: // SRTO_TWOWAYDATA: not to be used. SRT connection is always bidirectional if // both clients support HSv5 - that is, since version 1.3.0. This flag was // introducted around 1.2.0 version when full bidirectional support was added, // but the bidirectional feature was decided no to be enabled due to huge // differences between bidirectional support (especially concerning encryption) // with HSv4 and HSv5 (that is, HSv4 was decided to remain unidirectional only, // even though partial support is already provided in this version). #define SRTO_TWOWAYDATA SRT_DEPRECATED_OPTION(37) // This has been deprecated a long time ago, treat this as never implemented. // The value is also already reused for another option. #define SRTO_TSBPDMAXLAG SRT_DEPRECATED_OPTION(32) // This option is a derivative from UDT; the mechanism that uses it is now // settable by SRTO_CONGESTION, or more generally by SRTO_TRANSTYPE. The freed // number has been reused for a read-only option SRTO_ISN. This option should // have never been used anywhere, just for safety this is temporarily declared // as deprecated. #define SRTO_CC SRT_DEPRECATED_OPTION(3) // These two flags were derived from UDT, but they were never used. // Probably it didn't make sense anyway. The maximum size of the message // in File/Message mode is defined by SRTO_SNDBUF, and the MSGTTL is // a parameter used in `srt_sendmsg` and `srt_sendmsg2`. #define SRTO_MAXMSG SRT_DEPRECATED_OPTION(10) #define SRTO_MSGTTL SRT_DEPRECATED_OPTION(11) // These flags come from an older experimental implementation of bidirectional // encryption support, which were used two different SEKs, KEKs and passphrases // per direction. The current implementation uses just one in both directions, // so SRTO_PBKEYLEN should be used for both cases. #define SRTO_SNDPBKEYLEN SRT_DEPRECATED_OPTION(38) #define SRTO_RCVPBKEYLEN SRT_DEPRECATED_OPTION(39) // Keeping old name for compatibility (deprecated) #define SRTO_SMOOTHER SRT_DEPRECATED_OPTION(47) #define SRTO_STRICTENC SRT_DEPRECATED_OPTION(53) typedef enum SRT_TRANSTYPE { SRTT_LIVE, SRTT_FILE, SRTT_INVALID } SRT_TRANSTYPE; // These sizes should be used for Live mode. In Live mode you should not // exceed the size that fits in a single MTU. // This is for MPEG TS and it's a default SRTO_PAYLOADSIZE for SRTT_LIVE. static const int SRT_LIVE_DEF_PLSIZE = 1316; // = 188*7, recommended for MPEG TS // This is the maximum payload size for Live mode, should you have a different // payload type than MPEG TS. static const int SRT_LIVE_MAX_PLSIZE = 1456; // MTU(1500) - UDP.hdr(28) - SRT.hdr(16) // Latency for Live transmission: default is 120 static const int SRT_LIVE_DEF_LATENCY_MS = 120; // Importrant note: please add new fields to this structure to the end and don't remove any existing fields struct CBytePerfMon { // global measurements int64_t msTimeStamp; // time since the UDT entity is started, in milliseconds int64_t pktSentTotal; // total number of sent data packets, including retransmissions int64_t pktRecvTotal; // total number of received packets int pktSndLossTotal; // total number of lost packets (sender side) int pktRcvLossTotal; // total number of lost packets (receiver side) int pktRetransTotal; // total number of retransmitted packets int pktSentACKTotal; // total number of sent ACK packets int pktRecvACKTotal; // total number of received ACK packets int pktSentNAKTotal; // total number of sent NAK packets int pktRecvNAKTotal; // total number of received NAK packets int64_t usSndDurationTotal; // total time duration when UDT is sending data (idle time exclusive) //>new int pktSndDropTotal; // number of too-late-to-send dropped packets int pktRcvDropTotal; // number of too-late-to play missing packets int pktRcvUndecryptTotal; // number of undecrypted packets uint64_t byteSentTotal; // total number of sent data bytes, including retransmissions uint64_t byteRecvTotal; // total number of received bytes #ifdef SRT_ENABLE_LOSTBYTESCOUNT uint64_t byteRcvLossTotal; // total number of lost bytes #endif uint64_t byteRetransTotal; // total number of retransmitted bytes uint64_t byteSndDropTotal; // number of too-late-to-send dropped bytes uint64_t byteRcvDropTotal; // number of too-late-to play missing bytes (estimate based on average packet size) uint64_t byteRcvUndecryptTotal; // number of undecrypted bytes //< // local measurements int64_t pktSent; // number of sent data packets, including retransmissions int64_t pktRecv; // number of received packets int pktSndLoss; // number of lost packets (sender side) int pktRcvLoss; // number of lost packets (receiver side) int pktRetrans; // number of retransmitted packets int pktRcvRetrans; // number of retransmitted packets received int pktSentACK; // number of sent ACK packets int pktRecvACK; // number of received ACK packets int pktSentNAK; // number of sent NAK packets int pktRecvNAK; // number of received NAK packets double mbpsSendRate; // sending rate in Mb/s double mbpsRecvRate; // receiving rate in Mb/s int64_t usSndDuration; // busy sending time (i.e., idle time exclusive) int pktReorderDistance; // size of order discrepancy in received sequences double pktRcvAvgBelatedTime; // average time of packet delay for belated packets (packets with sequence past the ACK) int64_t pktRcvBelated; // number of received AND IGNORED packets due to having come too late //>new int pktSndDrop; // number of too-late-to-send dropped packets int pktRcvDrop; // number of too-late-to play missing packets int pktRcvUndecrypt; // number of undecrypted packets uint64_t byteSent; // number of sent data bytes, including retransmissions uint64_t byteRecv; // number of received bytes #ifdef SRT_ENABLE_LOSTBYTESCOUNT uint64_t byteRcvLoss; // number of retransmitted bytes #endif uint64_t byteRetrans; // number of retransmitted bytes uint64_t byteSndDrop; // number of too-late-to-send dropped bytes uint64_t byteRcvDrop; // number of too-late-to play missing bytes (estimate based on average packet size) uint64_t byteRcvUndecrypt; // number of undecrypted bytes //< // instant measurements double usPktSndPeriod; // packet sending period, in microseconds int pktFlowWindow; // flow window size, in number of packets int pktCongestionWindow; // congestion window size, in number of packets int pktFlightSize; // number of packets on flight double msRTT; // RTT, in milliseconds double mbpsBandwidth; // estimated bandwidth, in Mb/s int byteAvailSndBuf; // available UDT sender buffer size int byteAvailRcvBuf; // available UDT receiver buffer size //>new double mbpsMaxBW; // Transmit Bandwidth ceiling (Mbps) int byteMSS; // MTU int pktSndBuf; // UnACKed packets in UDT sender int byteSndBuf; // UnACKed bytes in UDT sender int msSndBuf; // UnACKed timespan (msec) of UDT sender int msSndTsbPdDelay; // Timestamp-based Packet Delivery Delay int pktRcvBuf; // Undelivered packets in UDT receiver int byteRcvBuf; // Undelivered bytes of UDT receiver int msRcvBuf; // Undelivered timespan (msec) of UDT receiver int msRcvTsbPdDelay; // Timestamp-based Packet Delivery Delay int pktSndFilterExtraTotal; // number of control packets supplied by packet filter int pktRcvFilterExtraTotal; // number of control packets received and not supplied back int pktRcvFilterSupplyTotal; // number of packets that the filter supplied extra (e.g. FEC rebuilt) int pktRcvFilterLossTotal; // number of packet loss not coverable by filter int pktSndFilterExtra; // number of control packets supplied by packet filter int pktRcvFilterExtra; // number of control packets received and not supplied back int pktRcvFilterSupply; // number of packets that the filter supplied extra (e.g. FEC rebuilt) int pktRcvFilterLoss; // number of packet loss not coverable by filter int pktReorderTolerance; // packet reorder tolerance value //< }; //////////////////////////////////////////////////////////////////////////////// // Error codes - define outside the CUDTException class // because otherwise you'd have to use CUDTException::MJ_SUCCESS etc. // in all throw CUDTException expressions. enum CodeMajor { MJ_UNKNOWN = -1, MJ_SUCCESS = 0, MJ_SETUP = 1, MJ_CONNECTION = 2, MJ_SYSTEMRES = 3, MJ_FILESYSTEM = 4, MJ_NOTSUP = 5, MJ_AGAIN = 6, MJ_PEERERROR = 7 }; enum CodeMinor { // These are "minor" error codes from various "major" categories // MJ_SETUP MN_NONE = 0, MN_TIMEOUT = 1, MN_REJECTED = 2, MN_NORES = 3, MN_SECURITY = 4, // MJ_CONNECTION MN_CONNLOST = 1, MN_NOCONN = 2, // MJ_SYSTEMRES MN_THREAD = 1, MN_MEMORY = 2, // MJ_FILESYSTEM MN_SEEKGFAIL = 1, MN_READFAIL = 2, MN_SEEKPFAIL = 3, MN_WRITEFAIL = 4, // MJ_NOTSUP MN_ISBOUND = 1, MN_ISCONNECTED = 2, MN_INVAL = 3, MN_SIDINVAL = 4, MN_ISUNBOUND = 5, MN_NOLISTEN = 6, MN_ISRENDEZVOUS = 7, MN_ISRENDUNBOUND = 8, MN_INVALMSGAPI = 9, MN_INVALBUFFERAPI = 10, MN_BUSY = 11, MN_XSIZE = 12, MN_EIDINVAL = 13, // MJ_AGAIN MN_WRAVAIL = 1, MN_RDAVAIL = 2, MN_XMTIMEOUT = 3, MN_CONGESTION = 4 }; static const enum CodeMinor MN_ISSTREAM SRT_ATR_DEPRECATED = (enum CodeMinor)(9); static const enum CodeMinor MN_ISDGRAM SRT_ATR_DEPRECATED = (enum CodeMinor)(10); // Stupid, but effective. This will be #undefined, so don't worry. #define MJ(major) (1000 * MJ_##major) #define MN(major, minor) (1000 * MJ_##major + MN_##minor) // Some better way to define it, and better for C language. typedef enum SRT_ERRNO { SRT_EUNKNOWN = -1, SRT_SUCCESS = MJ_SUCCESS, SRT_ECONNSETUP = MJ(SETUP), SRT_ENOSERVER = MN(SETUP, TIMEOUT), SRT_ECONNREJ = MN(SETUP, REJECTED), SRT_ESOCKFAIL = MN(SETUP, NORES), SRT_ESECFAIL = MN(SETUP, SECURITY), SRT_ECONNFAIL = MJ(CONNECTION), SRT_ECONNLOST = MN(CONNECTION, CONNLOST), SRT_ENOCONN = MN(CONNECTION, NOCONN), SRT_ERESOURCE = MJ(SYSTEMRES), SRT_ETHREAD = MN(SYSTEMRES, THREAD), SRT_ENOBUF = MN(SYSTEMRES, MEMORY), SRT_EFILE = MJ(FILESYSTEM), SRT_EINVRDOFF = MN(FILESYSTEM, SEEKGFAIL), SRT_ERDPERM = MN(FILESYSTEM, READFAIL), SRT_EINVWROFF = MN(FILESYSTEM, SEEKPFAIL), SRT_EWRPERM = MN(FILESYSTEM, WRITEFAIL), SRT_EINVOP = MJ(NOTSUP), SRT_EBOUNDSOCK = MN(NOTSUP, ISBOUND), SRT_ECONNSOCK = MN(NOTSUP, ISCONNECTED), SRT_EINVPARAM = MN(NOTSUP, INVAL), SRT_EINVSOCK = MN(NOTSUP, SIDINVAL), SRT_EUNBOUNDSOCK = MN(NOTSUP, ISUNBOUND), SRT_ENOLISTEN = MN(NOTSUP, NOLISTEN), SRT_ERDVNOSERV = MN(NOTSUP, ISRENDEZVOUS), SRT_ERDVUNBOUND = MN(NOTSUP, ISRENDUNBOUND), SRT_EINVALMSGAPI = MN(NOTSUP, INVALMSGAPI), SRT_EINVALBUFFERAPI = MN(NOTSUP, INVALBUFFERAPI), SRT_EDUPLISTEN = MN(NOTSUP, BUSY), SRT_ELARGEMSG = MN(NOTSUP, XSIZE), SRT_EINVPOLLID = MN(NOTSUP, EIDINVAL), SRT_EASYNCFAIL = MJ(AGAIN), SRT_EASYNCSND = MN(AGAIN, WRAVAIL), SRT_EASYNCRCV = MN(AGAIN, RDAVAIL), SRT_ETIMEOUT = MN(AGAIN, XMTIMEOUT), SRT_ECONGEST = MN(AGAIN, CONGESTION), SRT_EPEERERR = MJ(PEERERROR) } SRT_ERRNO; static const SRT_ERRNO SRT_EISSTREAM SRT_ATR_DEPRECATED = (SRT_ERRNO) MN(NOTSUP, INVALMSGAPI); static const SRT_ERRNO SRT_EISDGRAM SRT_ATR_DEPRECATED = (SRT_ERRNO) MN(NOTSUP, INVALBUFFERAPI); #undef MJ #undef MN enum SRT_REJECT_REASON { SRT_REJ_UNKNOWN, // initial set when in progress SRT_REJ_SYSTEM, // broken due to system function error SRT_REJ_PEER, // connection was rejected by peer SRT_REJ_RESOURCE, // internal problem with resource allocation SRT_REJ_ROGUE, // incorrect data in handshake messages SRT_REJ_BACKLOG, // listener's backlog exceeded SRT_REJ_IPE, // internal program error SRT_REJ_CLOSE, // socket is closing SRT_REJ_VERSION, // peer is older version than agent's minimum set SRT_REJ_RDVCOOKIE, // rendezvous cookie collision SRT_REJ_BADSECRET, // wrong password SRT_REJ_UNSECURE, // password required or unexpected SRT_REJ_MESSAGEAPI, // streamapi/messageapi collision SRT_REJ_CONGESTION, // incompatible congestion-controller type SRT_REJ_FILTER, // incompatible packet filter SRT_REJ__SIZE, }; // Logging API - specialization for SRT. // Define logging functional areas for log selection. // Use values greater than 0. Value 0 is reserved for LOGFA_GENERAL, // which is considered always enabled. // Logger Functional Areas // Note that 0 is "general". // Made by #define so that it's available also for C API. #define SRT_LOGFA_GENERAL 0 #define SRT_LOGFA_BSTATS 1 #define SRT_LOGFA_CONTROL 2 #define SRT_LOGFA_DATA 3 #define SRT_LOGFA_TSBPD 4 #define SRT_LOGFA_REXMIT 5 #define SRT_LOGFA_HAICRYPT 6 #define SRT_LOGFA_CONGEST 7 // To make a typical int32_t size, although still use std::bitset. // C API will carry it over. #define SRT_LOGFA_LASTNONE 31 enum SRT_KM_STATE { SRT_KM_S_UNSECURED = 0, //No encryption SRT_KM_S_SECURING = 1, //Stream encrypted, exchanging Keying Material SRT_KM_S_SECURED = 2, //Stream encrypted, keying Material exchanged, decrypting ok. SRT_KM_S_NOSECRET = 3, //Stream encrypted and no secret to decrypt Keying Material SRT_KM_S_BADSECRET = 4 //Stream encrypted and wrong secret, cannot decrypt Keying Material }; enum SRT_EPOLL_OPT { SRT_EPOLL_OPT_NONE = 0x0, // fallback // this values are defined same as linux epoll.h // so that if system values are used by mistake, they should have the same effect SRT_EPOLL_IN = 0x1, SRT_EPOLL_OUT = 0x4, SRT_EPOLL_ERR = 0x8, SRT_EPOLL_ET = 1u << 31 }; // These are actually flags - use a bit container: typedef int32_t SRT_EPOLL_T; enum SRT_EPOLL_FLAGS { /// This allows the EID container to be empty when calling the waiting /// function with infinite time. This means an infinite hangup, although /// a socket can be added to this EID from a separate thread. SRT_EPOLL_ENABLE_EMPTY = 1, /// This makes the waiting function check if there is output container /// passed to it, and report an error if it isn't. By default it is allowed /// that the output container is 0 size or NULL and therefore the readiness /// state is reported only as a number of ready sockets from return value. SRT_EPOLL_ENABLE_OUTPUTCHECK = 2 }; #ifdef __cplusplus // In C++ these enums cannot be treated as int and glued by operator |. // Unless this operator is defined. inline SRT_EPOLL_OPT operator|(SRT_EPOLL_OPT a1, SRT_EPOLL_OPT a2) { return SRT_EPOLL_OPT( (int)a1 | (int)a2 ); } inline bool operator&(int flags, SRT_EPOLL_OPT eflg) { // Using an enum prevents treating int automatically as enum, // requires explicit enum to be passed here, and minimizes the // risk that the right side value will contain multiple flags. return (flags & int(eflg)) != 0; } #endif typedef struct CBytePerfMon SRT_TRACEBSTATS; static const SRTSOCKET SRT_INVALID_SOCK = -1; static const int SRT_ERROR = -1; // library initialization SRT_API int srt_startup(void); SRT_API int srt_cleanup(void); // // Socket operations // SRT_API SRTSOCKET srt_socket (int af, int type, int protocol); SRT_API SRTSOCKET srt_create_socket(); SRT_API int srt_bind (SRTSOCKET u, const struct sockaddr* name, int namelen); SRT_API int srt_bind_peerof (SRTSOCKET u, UDPSOCKET udpsock); SRT_API int srt_listen (SRTSOCKET u, int backlog); SRT_API SRTSOCKET srt_accept (SRTSOCKET u, struct sockaddr* addr, int* addrlen); typedef int srt_listen_callback_fn (void* opaq, SRTSOCKET ns, int hsversion, const struct sockaddr* peeraddr, const char* streamid); SRT_API int srt_listen_callback(SRTSOCKET lsn, srt_listen_callback_fn* hook_fn, void* hook_opaque); SRT_API int srt_connect (SRTSOCKET u, const struct sockaddr* name, int namelen); SRT_API int srt_connect_debug(SRTSOCKET u, const struct sockaddr* name, int namelen, int forced_isn); SRT_API int srt_rendezvous (SRTSOCKET u, const struct sockaddr* local_name, int local_namelen, const struct sockaddr* remote_name, int remote_namelen); SRT_API int srt_close (SRTSOCKET u); SRT_API int srt_getpeername (SRTSOCKET u, struct sockaddr* name, int* namelen); SRT_API int srt_getsockname (SRTSOCKET u, struct sockaddr* name, int* namelen); SRT_API int srt_getsockopt (SRTSOCKET u, int level /*ignored*/, SRT_SOCKOPT optname, void* optval, int* optlen); SRT_API int srt_setsockopt (SRTSOCKET u, int level /*ignored*/, SRT_SOCKOPT optname, const void* optval, int optlen); SRT_API int srt_getsockflag (SRTSOCKET u, SRT_SOCKOPT opt, void* optval, int* optlen); SRT_API int srt_setsockflag (SRTSOCKET u, SRT_SOCKOPT opt, const void* optval, int optlen); // XXX Note that the srctime functionality doesn't work yet and needs fixing. typedef struct SRT_MsgCtrl_ { int flags; // Left for future int msgttl; // TTL for a message, default -1 (no TTL limitation) int inorder; // Whether a message is allowed to supersede partially lost one. Unused in stream and live mode. int boundary; // 0:mid pkt, 1(01b):end of frame, 2(11b):complete frame, 3(10b): start of frame uint64_t srctime; // source timestamp (usec), 0: use internal time int32_t pktseq; // sequence number of the first packet in received message (unused for sending) int32_t msgno; // message number (output value for both sending and receiving) } SRT_MSGCTRL; // You are free to use either of these two methods to set SRT_MSGCTRL object // to default values: either call srt_msgctrl_init(&obj) or obj = srt_msgctrl_default. SRT_API void srt_msgctrl_init(SRT_MSGCTRL* mctrl); SRT_API extern const SRT_MSGCTRL srt_msgctrl_default; // The send/receive functions. // These functions have different names due to different sets of parameters // to be supplied. Not all of them are needed or make sense in all modes: // Plain: supply only the buffer and its size. // Msg: supply additionally // - TTL (message is not delivered when exceeded) and // - INORDER (when false, the message is allowed to be delivered in different // order than when it was sent, when the later message is earlier ready to // deliver) // Msg2: Supply extra parameters in SRT_MSGCTRL. When receiving, these // parameters will be filled, as needed. NULL is acceptable, in which case // the defaults are used. // NOTE: srt_send and srt_recv have the last "..." left to allow ignore a // deprecated and unused "flags" parameter. After confirming that all // compat applications that pass useless 0 there are fixed, this will be // removed. // // Sending functions // SRT_API int srt_send (SRTSOCKET u, const char* buf, int len); SRT_API int srt_sendmsg (SRTSOCKET u, const char* buf, int len, int ttl/* = -1*/, int inorder/* = false*/); SRT_API int srt_sendmsg2(SRTSOCKET u, const char* buf, int len, SRT_MSGCTRL *mctrl); // // Receiving functions // SRT_API int srt_recv (SRTSOCKET u, char* buf, int len); // srt_recvmsg is actually an alias to srt_recv, it stays under the old name for compat reasons. SRT_API int srt_recvmsg (SRTSOCKET u, char* buf, int len); SRT_API int srt_recvmsg2(SRTSOCKET u, char *buf, int len, SRT_MSGCTRL *mctrl); // Special send/receive functions for files only. #define SRT_DEFAULT_SENDFILE_BLOCK 364000 #define SRT_DEFAULT_RECVFILE_BLOCK 7280000 SRT_API int64_t srt_sendfile(SRTSOCKET u, const char* path, int64_t* offset, int64_t size, int block); SRT_API int64_t srt_recvfile(SRTSOCKET u, const char* path, int64_t* offset, int64_t size, int block); // last error detection SRT_API const char* srt_getlasterror_str(void); SRT_API int srt_getlasterror(int* errno_loc); SRT_API const char* srt_strerror(int code, int errnoval); SRT_API void srt_clearlasterror(void); // performance track // perfmon with Byte counters for better bitrate estimation. SRT_API int srt_bstats(SRTSOCKET u, SRT_TRACEBSTATS * perf, int clear); // permon with Byte counters and instantaneous stats instead of moving averages for Snd/Rcvbuffer sizes. SRT_API int srt_bistats(SRTSOCKET u, SRT_TRACEBSTATS * perf, int clear, int instantaneous); // Socket Status (for problem tracking) SRT_API SRT_SOCKSTATUS srt_getsockstate(SRTSOCKET u); SRT_API int srt_epoll_create(void); SRT_API int srt_epoll_add_usock(int eid, SRTSOCKET u, const int* events); SRT_API int srt_epoll_add_ssock(int eid, SYSSOCKET s, const int* events); SRT_API int srt_epoll_remove_usock(int eid, SRTSOCKET u); SRT_API int srt_epoll_remove_ssock(int eid, SYSSOCKET s); SRT_API int srt_epoll_update_usock(int eid, SRTSOCKET u, const int* events); SRT_API int srt_epoll_update_ssock(int eid, SYSSOCKET s, const int* events); SRT_API int srt_epoll_wait(int eid, SRTSOCKET* readfds, int* rnum, SRTSOCKET* writefds, int* wnum, int64_t msTimeOut, SYSSOCKET* lrfds, int* lrnum, SYSSOCKET* lwfds, int* lwnum); typedef struct SRT_EPOLL_EVENT_ { SRTSOCKET fd; int events; // SRT_EPOLL_IN | SRT_EPOLL_OUT | SRT_EPOLL_ERR } SRT_EPOLL_EVENT; SRT_API int srt_epoll_uwait(int eid, SRT_EPOLL_EVENT* fdsSet, int fdsSize, int64_t msTimeOut); SRT_API int32_t srt_epoll_set(int eid, int32_t flags); SRT_API int srt_epoll_release(int eid); // Logging control SRT_API void srt_setloglevel(int ll); SRT_API void srt_addlogfa(int fa); SRT_API void srt_dellogfa(int fa); SRT_API void srt_resetlogfa(const int* fara, size_t fara_size); // This isn't predicted, will be only available in SRT C++ API. // For the time being, until this API is ready, use UDT::setlogstream. // SRT_API void srt_setlogstream(std::ostream& stream); SRT_API void srt_setloghandler(void* opaque, SRT_LOG_HANDLER_FN* handler); SRT_API void srt_setlogflags(int flags); SRT_API int srt_getsndbuffer(SRTSOCKET sock, size_t* blocks, size_t* bytes); SRT_API enum SRT_REJECT_REASON srt_getrejectreason(SRTSOCKET sock); SRT_API extern const char* const srt_rejectreason_msg []; const char* srt_rejectreason_str(enum SRT_REJECT_REASON id); #ifdef __cplusplus } #endif #endif