/* * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * Haivision Open SRT (Secure Reliable Transport) protocol */ #include #include "libavutil/opt.h" #include "libavutil/parseutils.h" #include "libavutil/time.h" #include "avformat.h" #include "internal.h" #include "network.h" #include "os_support.h" #include "url.h" /* This is for MPEG-TS and it's a default SRTO_PAYLOADSIZE for SRTT_LIVE (8 TS packets) */ #ifndef SRT_LIVE_DEFAULT_PAYLOAD_SIZE #define SRT_LIVE_DEFAULT_PAYLOAD_SIZE 1316 #endif /* This is the maximum payload size for Live mode, should you have a different payload type than MPEG-TS */ #ifndef SRT_LIVE_MAX_PAYLOAD_SIZE #define SRT_LIVE_MAX_PAYLOAD_SIZE 1456 #endif enum SRTMode { SRT_MODE_CALLER = 0, SRT_MODE_LISTENER = 1, SRT_MODE_RENDEZVOUS = 2 }; typedef struct SRTContext { const AVClass *class; int fd; int eid; int64_t rw_timeout; int64_t listen_timeout; int recv_buffer_size; int send_buffer_size; int64_t maxbw; int pbkeylen; char *passphrase; #if SRT_VERSION_VALUE >= 0x010302 int enforced_encryption; int kmrefreshrate; int kmpreannounce; int64_t snddropdelay; #endif int mss; int ffs; int ipttl; int iptos; int64_t inputbw; int oheadbw; int64_t latency; int tlpktdrop; int nakreport; int64_t connect_timeout; int payload_size; int64_t rcvlatency; int64_t peerlatency; enum SRTMode mode; int sndbuf; int rcvbuf; int lossmaxttl; int minversion; char *streamid; char *smoother; int messageapi; SRT_TRANSTYPE transtype; int linger; int tsbpd; } SRTContext; #define D AV_OPT_FLAG_DECODING_PARAM #define E AV_OPT_FLAG_ENCODING_PARAM #define OFFSET(x) offsetof(SRTContext, x) static const AVOption libsrt_options[] = { { "timeout", "Timeout of socket I/O operations (in microseconds)", OFFSET(rw_timeout), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E }, { "listen_timeout", "Connection awaiting timeout (in microseconds)" , OFFSET(listen_timeout), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E }, { "send_buffer_size", "Socket send buffer size (in bytes)", OFFSET(send_buffer_size), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E }, { "recv_buffer_size", "Socket receive buffer size (in bytes)", OFFSET(recv_buffer_size), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E }, { "pkt_size", "Maximum SRT packet size", OFFSET(payload_size), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, SRT_LIVE_MAX_PAYLOAD_SIZE, .flags = D|E, "payload_size" }, { "payload_size", "Maximum SRT packet size", OFFSET(payload_size), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, SRT_LIVE_MAX_PAYLOAD_SIZE, .flags = D|E, "payload_size" }, { "ts_size", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = SRT_LIVE_DEFAULT_PAYLOAD_SIZE }, INT_MIN, INT_MAX, .flags = D|E, "payload_size" }, { "max_size", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = SRT_LIVE_MAX_PAYLOAD_SIZE }, INT_MIN, INT_MAX, .flags = D|E, "payload_size" }, { "maxbw", "Maximum bandwidth (bytes per second) that the connection can use", OFFSET(maxbw), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E }, { "pbkeylen", "Crypto key len in bytes {16,24,32} Default: 16 (128-bit)", OFFSET(pbkeylen), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 32, .flags = D|E }, { "passphrase", "Crypto PBKDF2 Passphrase size[0,10..64] 0:disable crypto", OFFSET(passphrase), AV_OPT_TYPE_STRING, { .str = NULL }, .flags = D|E }, #if SRT_VERSION_VALUE >= 0x010302 { "enforced_encryption", "Enforces that both connection parties have the same passphrase set", OFFSET(enforced_encryption), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, .flags = D|E }, { "kmrefreshrate", "The number of packets to be transmitted after which the encryption key is switched to a new key", OFFSET(kmrefreshrate), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E }, { "kmpreannounce", "The interval between when a new encryption key is sent and when switchover occurs", OFFSET(kmpreannounce), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E }, { "snddropdelay", "The sender's extra delay(in microseconds) before dropping packets", OFFSET(snddropdelay), AV_OPT_TYPE_INT64, { .i64 = -2 }, -2, INT64_MAX, .flags = D|E }, #endif { "mss", "The Maximum Segment Size", OFFSET(mss), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1500, .flags = D|E }, { "ffs", "Flight flag size (window size) (in bytes)", OFFSET(ffs), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E }, { "ipttl", "IP Time To Live", OFFSET(ipttl), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 255, .flags = D|E }, { "iptos", "IP Type of Service", OFFSET(iptos), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 255, .flags = D|E }, { "inputbw", "Estimated input stream rate", OFFSET(inputbw), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E }, { "oheadbw", "MaxBW ceiling based on % over input stream rate", OFFSET(oheadbw), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 100, .flags = D|E }, { "latency", "receiver delay (in microseconds) to absorb bursts of missed packet retransmissions", OFFSET(latency), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E }, { "tsbpddelay", "deprecated, same effect as latency option", OFFSET(latency), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E }, { "rcvlatency", "receive latency (in microseconds)", OFFSET(rcvlatency), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E }, { "peerlatency", "peer latency (in microseconds)", OFFSET(peerlatency), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E }, { "tlpktdrop", "Enable too-late pkt drop", OFFSET(tlpktdrop), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, .flags = D|E }, { "nakreport", "Enable receiver to send periodic NAK reports", OFFSET(nakreport), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, .flags = D|E }, { "connect_timeout", "Connect timeout(in milliseconds). Caller default: 3000, rendezvous (x 10)", OFFSET(connect_timeout), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E }, { "mode", "Connection mode (caller, listener, rendezvous)", OFFSET(mode), AV_OPT_TYPE_INT, { .i64 = SRT_MODE_CALLER }, SRT_MODE_CALLER, SRT_MODE_RENDEZVOUS, .flags = D|E, "mode" }, { "caller", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = SRT_MODE_CALLER }, INT_MIN, INT_MAX, .flags = D|E, "mode" }, { "listener", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = SRT_MODE_LISTENER }, INT_MIN, INT_MAX, .flags = D|E, "mode" }, { "rendezvous", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = SRT_MODE_RENDEZVOUS }, INT_MIN, INT_MAX, .flags = D|E, "mode" }, { "sndbuf", "Send buffer size (in bytes)", OFFSET(sndbuf), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E }, { "rcvbuf", "Receive buffer size (in bytes)", OFFSET(rcvbuf), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E }, { "lossmaxttl", "Maximum possible packet reorder tolerance", OFFSET(lossmaxttl), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E }, { "minversion", "The minimum SRT version that is required from the peer", OFFSET(minversion), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E }, { "streamid", "A string of up to 512 characters that an Initiator can pass to a Responder", OFFSET(streamid), AV_OPT_TYPE_STRING, { .str = NULL }, .flags = D|E }, { "srt_streamid", "A string of up to 512 characters that an Initiator can pass to a Responder", OFFSET(streamid), AV_OPT_TYPE_STRING, { .str = NULL }, .flags = D|E }, { "smoother", "The type of Smoother used for the transmission for that socket", OFFSET(smoother), AV_OPT_TYPE_STRING, { .str = NULL }, .flags = D|E }, { "messageapi", "Enable message API", OFFSET(messageapi), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, .flags = D|E }, { "transtype", "The transmission type for the socket", OFFSET(transtype), AV_OPT_TYPE_INT, { .i64 = SRTT_INVALID }, SRTT_LIVE, SRTT_INVALID, .flags = D|E, "transtype" }, { "live", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = SRTT_LIVE }, INT_MIN, INT_MAX, .flags = D|E, "transtype" }, { "file", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = SRTT_FILE }, INT_MIN, INT_MAX, .flags = D|E, "transtype" }, { "linger", "Number of seconds that the socket waits for unsent data when closing", OFFSET(linger), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E }, { "tsbpd", "Timestamp-based packet delivery", OFFSET(tsbpd), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, .flags = D|E }, { NULL } }; static int libsrt_neterrno(URLContext *h) { int os_errno; int err = srt_getlasterror(&os_errno); if (err == SRT_EASYNCRCV || err == SRT_EASYNCSND) return AVERROR(EAGAIN); av_log(h, AV_LOG_ERROR, "%s\n", srt_getlasterror_str()); return os_errno ? AVERROR(os_errno) : AVERROR_UNKNOWN; } static int libsrt_getsockopt(URLContext *h, int fd, SRT_SOCKOPT optname, const char * optnamestr, void * optval, int * optlen) { if (srt_getsockopt(fd, 0, optname, optval, optlen) < 0) { av_log(h, AV_LOG_ERROR, "failed to get option %s on socket: %s\n", optnamestr, srt_getlasterror_str()); return AVERROR(EIO); } return 0; } static int libsrt_socket_nonblock(int socket, int enable) { int ret, blocking = enable ? 0 : 1; /* Setting SRTO_{SND,RCV}SYN options to 1 enable blocking mode, setting them to 0 enable non-blocking mode. */ ret = srt_setsockopt(socket, 0, SRTO_SNDSYN, &blocking, sizeof(blocking)); if (ret < 0) return ret; return srt_setsockopt(socket, 0, SRTO_RCVSYN, &blocking, sizeof(blocking)); } static int libsrt_epoll_create(URLContext *h, int fd, int write) { int modes = SRT_EPOLL_ERR | (write ? SRT_EPOLL_OUT : SRT_EPOLL_IN); int eid = srt_epoll_create(); if (eid < 0) return libsrt_neterrno(h); if (srt_epoll_add_usock(eid, fd, &modes) < 0) { srt_epoll_release(eid); return libsrt_neterrno(h); } return eid; } static int libsrt_network_wait_fd(URLContext *h, int eid, int write) { int ret, len = 1, errlen = 1; SRTSOCKET ready[1]; SRTSOCKET error[1]; if (write) { ret = srt_epoll_wait(eid, error, &errlen, ready, &len, POLLING_TIME, 0, 0, 0, 0); } else { ret = srt_epoll_wait(eid, ready, &len, error, &errlen, POLLING_TIME, 0, 0, 0, 0); } if (ret < 0) { if (srt_getlasterror(NULL) == SRT_ETIMEOUT) ret = AVERROR(EAGAIN); else ret = libsrt_neterrno(h); } else { ret = errlen ? AVERROR(EIO) : 0; } return ret; } /* TODO de-duplicate code from ff_network_wait_fd_timeout() */ static int libsrt_network_wait_fd_timeout(URLContext *h, int eid, int write, int64_t timeout, AVIOInterruptCB *int_cb) { int ret; int64_t wait_start = 0; while (1) { if (ff_check_interrupt(int_cb)) return AVERROR_EXIT; ret = libsrt_network_wait_fd(h, eid, write); if (ret != AVERROR(EAGAIN)) return ret; if (timeout > 0) { if (!wait_start) wait_start = av_gettime_relative(); else if (av_gettime_relative() - wait_start > timeout) return AVERROR(ETIMEDOUT); } } } static int libsrt_listen(int eid, int fd, const struct sockaddr *addr, socklen_t addrlen, URLContext *h, int64_t timeout) { int ret; int reuse = 1; /* Max streamid length plus an extra space for the terminating null character */ char streamid[513]; int streamid_len = sizeof(streamid); if (srt_setsockopt(fd, SOL_SOCKET, SRTO_REUSEADDR, &reuse, sizeof(reuse))) { av_log(h, AV_LOG_WARNING, "setsockopt(SRTO_REUSEADDR) failed\n"); } if (srt_bind(fd, addr, addrlen)) return libsrt_neterrno(h); if (srt_listen(fd, 1)) return libsrt_neterrno(h); ret = libsrt_network_wait_fd_timeout(h, eid, 1, timeout, &h->interrupt_callback); if (ret < 0) return ret; ret = srt_accept(fd, NULL, NULL); if (ret < 0) return libsrt_neterrno(h); if (libsrt_socket_nonblock(ret, 1) < 0) av_log(h, AV_LOG_DEBUG, "libsrt_socket_nonblock failed\n"); if (!libsrt_getsockopt(h, ret, SRTO_STREAMID, "SRTO_STREAMID", streamid, &streamid_len)) /* Note: returned streamid_len doesn't count the terminating null character */ av_log(h, AV_LOG_VERBOSE, "accept streamid [%s], length %d\n", streamid, streamid_len); return ret; } static int libsrt_listen_connect(int eid, int fd, const struct sockaddr *addr, socklen_t addrlen, int64_t timeout, URLContext *h, int will_try_next) { int ret; if (srt_connect(fd, addr, addrlen) < 0) return libsrt_neterrno(h); ret = libsrt_network_wait_fd_timeout(h, eid, 1, timeout, &h->interrupt_callback); if (ret < 0) { if (will_try_next) { av_log(h, AV_LOG_WARNING, "Connection to %s failed (%s), trying next address\n", h->filename, av_err2str(ret)); } else { av_log(h, AV_LOG_ERROR, "Connection to %s failed: %s\n", h->filename, av_err2str(ret)); } } return ret; } static int libsrt_setsockopt(URLContext *h, int fd, SRT_SOCKOPT optname, const char * optnamestr, const void * optval, int optlen) { if (srt_setsockopt(fd, 0, optname, optval, optlen) < 0) { av_log(h, AV_LOG_ERROR, "failed to set option %s on socket: %s\n", optnamestr, srt_getlasterror_str()); return AVERROR(EIO); } return 0; } /* - The "POST" options can be altered any time on a connected socket. They MAY have also some meaning when set prior to connecting; such option is SRTO_RCVSYN, which makes connect/accept call asynchronous. Because of that this option is treated special way in this app. */ static int libsrt_set_options_post(URLContext *h, int fd) { SRTContext *s = h->priv_data; if ((s->inputbw >= 0 && libsrt_setsockopt(h, fd, SRTO_INPUTBW, "SRTO_INPUTBW", &s->inputbw, sizeof(s->inputbw)) < 0) || (s->oheadbw >= 0 && libsrt_setsockopt(h, fd, SRTO_OHEADBW, "SRTO_OHEADBW", &s->oheadbw, sizeof(s->oheadbw)) < 0)) { return AVERROR(EIO); } return 0; } /* - The "PRE" options must be set prior to connecting and can't be altered on a connected socket, however if set on a listening socket, they are derived by accept-ed socket. */ static int libsrt_set_options_pre(URLContext *h, int fd) { SRTContext *s = h->priv_data; int yes = 1; int latency = s->latency / 1000; int rcvlatency = s->rcvlatency / 1000; int peerlatency = s->peerlatency / 1000; #if SRT_VERSION_VALUE >= 0x010302 int snddropdelay = s->snddropdelay > 0 ? s->snddropdelay / 1000 : s->snddropdelay; #endif int connect_timeout = s->connect_timeout; if ((s->mode == SRT_MODE_RENDEZVOUS && libsrt_setsockopt(h, fd, SRTO_RENDEZVOUS, "SRTO_RENDEZVOUS", &yes, sizeof(yes)) < 0) || (s->transtype != SRTT_INVALID && libsrt_setsockopt(h, fd, SRTO_TRANSTYPE, "SRTO_TRANSTYPE", &s->transtype, sizeof(s->transtype)) < 0) || (s->maxbw >= 0 && libsrt_setsockopt(h, fd, SRTO_MAXBW, "SRTO_MAXBW", &s->maxbw, sizeof(s->maxbw)) < 0) || (s->pbkeylen >= 0 && libsrt_setsockopt(h, fd, SRTO_PBKEYLEN, "SRTO_PBKEYLEN", &s->pbkeylen, sizeof(s->pbkeylen)) < 0) || (s->passphrase && libsrt_setsockopt(h, fd, SRTO_PASSPHRASE, "SRTO_PASSPHRASE", s->passphrase, strlen(s->passphrase)) < 0) || #if SRT_VERSION_VALUE >= 0x010302 #if SRT_VERSION_VALUE >= 0x010401 (s->enforced_encryption >= 0 && libsrt_setsockopt(h, fd, SRTO_ENFORCEDENCRYPTION, "SRTO_ENFORCEDENCRYPTION", &s->enforced_encryption, sizeof(s->enforced_encryption)) < 0) || #else /* SRTO_STRICTENC == SRTO_ENFORCEDENCRYPTION (53), but for compatibility, we used SRTO_STRICTENC */ (s->enforced_encryption >= 0 && libsrt_setsockopt(h, fd, SRTO_STRICTENC, "SRTO_STRICTENC", &s->enforced_encryption, sizeof(s->enforced_encryption)) < 0) || #endif (s->kmrefreshrate >= 0 && libsrt_setsockopt(h, fd, SRTO_KMREFRESHRATE, "SRTO_KMREFRESHRATE", &s->kmrefreshrate, sizeof(s->kmrefreshrate)) < 0) || (s->kmpreannounce >= 0 && libsrt_setsockopt(h, fd, SRTO_KMPREANNOUNCE, "SRTO_KMPREANNOUNCE", &s->kmpreannounce, sizeof(s->kmpreannounce)) < 0) || (s->snddropdelay >=-1 && libsrt_setsockopt(h, fd, SRTO_SNDDROPDELAY, "SRTO_SNDDROPDELAY", &snddropdelay, sizeof(snddropdelay)) < 0) || #endif (s->mss >= 0 && libsrt_setsockopt(h, fd, SRTO_MSS, "SRTO_MSS", &s->mss, sizeof(s->mss)) < 0) || (s->ffs >= 0 && libsrt_setsockopt(h, fd, SRTO_FC, "SRTO_FC", &s->ffs, sizeof(s->ffs)) < 0) || (s->ipttl >= 0 && libsrt_setsockopt(h, fd, SRTO_IPTTL, "SRTO_IPTTL", &s->ipttl, sizeof(s->ipttl)) < 0) || (s->iptos >= 0 && libsrt_setsockopt(h, fd, SRTO_IPTOS, "SRTO_IPTOS", &s->iptos, sizeof(s->iptos)) < 0) || (s->latency >= 0 && libsrt_setsockopt(h, fd, SRTO_LATENCY, "SRTO_LATENCY", &latency, sizeof(latency)) < 0) || (s->rcvlatency >= 0 && libsrt_setsockopt(h, fd, SRTO_RCVLATENCY, "SRTO_RCVLATENCY", &rcvlatency, sizeof(rcvlatency)) < 0) || (s->peerlatency >= 0 && libsrt_setsockopt(h, fd, SRTO_PEERLATENCY, "SRTO_PEERLATENCY", &peerlatency, sizeof(peerlatency)) < 0) || (s->tlpktdrop >= 0 && libsrt_setsockopt(h, fd, SRTO_TLPKTDROP, "SRTO_TLPKTDROP", &s->tlpktdrop, sizeof(s->tlpktdrop)) < 0) || (s->nakreport >= 0 && libsrt_setsockopt(h, fd, SRTO_NAKREPORT, "SRTO_NAKREPORT", &s->nakreport, sizeof(s->nakreport)) < 0) || (connect_timeout >= 0 && libsrt_setsockopt(h, fd, SRTO_CONNTIMEO, "SRTO_CONNTIMEO", &connect_timeout, sizeof(connect_timeout)) <0 ) || (s->sndbuf >= 0 && libsrt_setsockopt(h, fd, SRTO_SNDBUF, "SRTO_SNDBUF", &s->sndbuf, sizeof(s->sndbuf)) < 0) || (s->rcvbuf >= 0 && libsrt_setsockopt(h, fd, SRTO_RCVBUF, "SRTO_RCVBUF", &s->rcvbuf, sizeof(s->rcvbuf)) < 0) || (s->lossmaxttl >= 0 && libsrt_setsockopt(h, fd, SRTO_LOSSMAXTTL, "SRTO_LOSSMAXTTL", &s->lossmaxttl, sizeof(s->lossmaxttl)) < 0) || (s->minversion >= 0 && libsrt_setsockopt(h, fd, SRTO_MINVERSION, "SRTO_MINVERSION", &s->minversion, sizeof(s->minversion)) < 0) || (s->streamid && libsrt_setsockopt(h, fd, SRTO_STREAMID, "SRTO_STREAMID", s->streamid, strlen(s->streamid)) < 0) || #if SRT_VERSION_VALUE >= 0x010401 (s->smoother && libsrt_setsockopt(h, fd, SRTO_CONGESTION, "SRTO_CONGESTION", s->smoother, strlen(s->smoother)) < 0) || #else (s->smoother && libsrt_setsockopt(h, fd, SRTO_SMOOTHER, "SRTO_SMOOTHER", s->smoother, strlen(s->smoother)) < 0) || #endif (s->messageapi >= 0 && libsrt_setsockopt(h, fd, SRTO_MESSAGEAPI, "SRTO_MESSAGEAPI", &s->messageapi, sizeof(s->messageapi)) < 0) || (s->payload_size >= 0 && libsrt_setsockopt(h, fd, SRTO_PAYLOADSIZE, "SRTO_PAYLOADSIZE", &s->payload_size, sizeof(s->payload_size)) < 0) || ((h->flags & AVIO_FLAG_WRITE) && libsrt_setsockopt(h, fd, SRTO_SENDER, "SRTO_SENDER", &yes, sizeof(yes)) < 0) || (s->tsbpd >= 0 && libsrt_setsockopt(h, fd, SRTO_TSBPDMODE, "SRTO_TSBPDMODE", &s->tsbpd, sizeof(s->tsbpd)) < 0)) { return AVERROR(EIO); } if (s->linger >= 0) { struct linger lin; lin.l_linger = s->linger; lin.l_onoff = lin.l_linger > 0 ? 1 : 0; if (libsrt_setsockopt(h, fd, SRTO_LINGER, "SRTO_LINGER", &lin, sizeof(lin)) < 0) return AVERROR(EIO); } return 0; } static int libsrt_setup(URLContext *h, const char *uri, int flags) { struct addrinfo hints = { 0 }, *ai, *cur_ai; int port, fd; SRTContext *s = h->priv_data; const char *p; char buf[256]; int ret; char hostname[1024],proto[1024],path[1024]; char portstr[10]; int64_t open_timeout = 0; int eid, write_eid; av_url_split(proto, sizeof(proto), NULL, 0, hostname, sizeof(hostname), &port, path, sizeof(path), uri); if (strcmp(proto, "srt")) return AVERROR(EINVAL); if (port <= 0 || port >= 65536) { av_log(h, AV_LOG_ERROR, "Port missing in uri\n"); return AVERROR(EINVAL); } p = strchr(uri, '?'); if (p) { if (av_find_info_tag(buf, sizeof(buf), "timeout", p)) { s->rw_timeout = strtoll(buf, NULL, 10); } if (av_find_info_tag(buf, sizeof(buf), "listen_timeout", p)) { s->listen_timeout = strtoll(buf, NULL, 10); } } if (s->rw_timeout >= 0) { open_timeout = h->rw_timeout = s->rw_timeout; } hints.ai_family = AF_UNSPEC; hints.ai_socktype = SOCK_DGRAM; snprintf(portstr, sizeof(portstr), "%d", port); if (s->mode == SRT_MODE_LISTENER) hints.ai_flags |= AI_PASSIVE; ret = getaddrinfo(hostname[0] ? hostname : NULL, portstr, &hints, &ai); if (ret) { av_log(h, AV_LOG_ERROR, "Failed to resolve hostname %s: %s\n", hostname, gai_strerror(ret)); return AVERROR(EIO); } cur_ai = ai; restart: #if SRT_VERSION_VALUE >= 0x010401 fd = srt_create_socket(); #else fd = srt_socket(cur_ai->ai_family, cur_ai->ai_socktype, 0); #endif if (fd < 0) { ret = libsrt_neterrno(h); goto fail; } if ((ret = libsrt_set_options_pre(h, fd)) < 0) { goto fail; } /* Set the socket's send or receive buffer sizes, if specified. If unspecified or setting fails, system default is used. */ if (s->recv_buffer_size > 0) { srt_setsockopt(fd, SOL_SOCKET, SRTO_UDP_RCVBUF, &s->recv_buffer_size, sizeof (s->recv_buffer_size)); } if (s->send_buffer_size > 0) { srt_setsockopt(fd, SOL_SOCKET, SRTO_UDP_SNDBUF, &s->send_buffer_size, sizeof (s->send_buffer_size)); } if (libsrt_socket_nonblock(fd, 1) < 0) av_log(h, AV_LOG_DEBUG, "libsrt_socket_nonblock failed\n"); ret = write_eid = libsrt_epoll_create(h, fd, 1); if (ret < 0) goto fail1; if (s->mode == SRT_MODE_LISTENER) { // multi-client ret = libsrt_listen(write_eid, fd, cur_ai->ai_addr, cur_ai->ai_addrlen, h, s->listen_timeout); srt_epoll_release(write_eid); if (ret < 0) goto fail1; srt_close(fd); fd = ret; } else { if (s->mode == SRT_MODE_RENDEZVOUS) { if (srt_bind(fd, cur_ai->ai_addr, cur_ai->ai_addrlen)) { ret = libsrt_neterrno(h); srt_epoll_release(write_eid); goto fail1; } } ret = libsrt_listen_connect(write_eid, fd, cur_ai->ai_addr, cur_ai->ai_addrlen, open_timeout, h, !!cur_ai->ai_next); srt_epoll_release(write_eid); if (ret < 0) { if (ret == AVERROR_EXIT) goto fail1; else goto fail; } } if ((ret = libsrt_set_options_post(h, fd)) < 0) { goto fail; } if (flags & AVIO_FLAG_WRITE) { int packet_size = 0; int optlen = sizeof(packet_size); ret = libsrt_getsockopt(h, fd, SRTO_PAYLOADSIZE, "SRTO_PAYLOADSIZE", &packet_size, &optlen); if (ret < 0) goto fail1; if (packet_size > 0) h->max_packet_size = packet_size; } ret = eid = libsrt_epoll_create(h, fd, flags & AVIO_FLAG_WRITE); if (eid < 0) goto fail1; h->is_streamed = 1; s->fd = fd; s->eid = eid; freeaddrinfo(ai); return 0; fail: if (cur_ai->ai_next) { /* Retry with the next sockaddr */ cur_ai = cur_ai->ai_next; if (fd >= 0) srt_close(fd); ret = 0; goto restart; } fail1: if (fd >= 0) srt_close(fd); freeaddrinfo(ai); return ret; } static int libsrt_open(URLContext *h, const char *uri, int flags) { SRTContext *s = h->priv_data; const char * p; char buf[1024]; int ret = 0; if (srt_startup() < 0) { return AVERROR_UNKNOWN; } /* SRT options (srt/srt.h) */ p = strchr(uri, '?'); if (p) { if (av_find_info_tag(buf, sizeof(buf), "maxbw", p)) { s->maxbw = strtoll(buf, NULL, 10); } if (av_find_info_tag(buf, sizeof(buf), "pbkeylen", p)) { s->pbkeylen = strtol(buf, NULL, 10); } if (av_find_info_tag(buf, sizeof(buf), "passphrase", p)) { av_freep(&s->passphrase); s->passphrase = av_strndup(buf, strlen(buf)); } #if SRT_VERSION_VALUE >= 0x010302 if (av_find_info_tag(buf, sizeof(buf), "enforced_encryption", p)) { s->enforced_encryption = strtol(buf, NULL, 10); } if (av_find_info_tag(buf, sizeof(buf), "kmrefreshrate", p)) { s->kmrefreshrate = strtol(buf, NULL, 10); } if (av_find_info_tag(buf, sizeof(buf), "kmpreannounce", p)) { s->kmpreannounce = strtol(buf, NULL, 10); } if (av_find_info_tag(buf, sizeof(buf), "snddropdelay", p)) { s->snddropdelay = strtoll(buf, NULL, 10); } #endif if (av_find_info_tag(buf, sizeof(buf), "mss", p)) { s->mss = strtol(buf, NULL, 10); } if (av_find_info_tag(buf, sizeof(buf), "ffs", p)) { s->ffs = strtol(buf, NULL, 10); } if (av_find_info_tag(buf, sizeof(buf), "ipttl", p)) { s->ipttl = strtol(buf, NULL, 10); } if (av_find_info_tag(buf, sizeof(buf), "iptos", p)) { s->iptos = strtol(buf, NULL, 10); } if (av_find_info_tag(buf, sizeof(buf), "inputbw", p)) { s->inputbw = strtoll(buf, NULL, 10); } if (av_find_info_tag(buf, sizeof(buf), "oheadbw", p)) { s->oheadbw = strtol(buf, NULL, 10); } if (av_find_info_tag(buf, sizeof(buf), "latency", p)) { s->latency = strtoll(buf, NULL, 10); } if (av_find_info_tag(buf, sizeof(buf), "tsbpddelay", p)) { s->latency = strtoll(buf, NULL, 10); } if (av_find_info_tag(buf, sizeof(buf), "rcvlatency", p)) { s->rcvlatency = strtoll(buf, NULL, 10); } if (av_find_info_tag(buf, sizeof(buf), "peerlatency", p)) { s->peerlatency = strtoll(buf, NULL, 10); } if (av_find_info_tag(buf, sizeof(buf), "tlpktdrop", p)) { s->tlpktdrop = strtol(buf, NULL, 10); } if (av_find_info_tag(buf, sizeof(buf), "nakreport", p)) { s->nakreport = strtol(buf, NULL, 10); } if (av_find_info_tag(buf, sizeof(buf), "connect_timeout", p)) { s->connect_timeout = strtoll(buf, NULL, 10); } if (av_find_info_tag(buf, sizeof(buf), "payload_size", p) || av_find_info_tag(buf, sizeof(buf), "pkt_size", p)) { s->payload_size = strtol(buf, NULL, 10); } if (av_find_info_tag(buf, sizeof(buf), "mode", p)) { if (!strcmp(buf, "caller")) { s->mode = SRT_MODE_CALLER; } else if (!strcmp(buf, "listener")) { s->mode = SRT_MODE_LISTENER; } else if (!strcmp(buf, "rendezvous")) { s->mode = SRT_MODE_RENDEZVOUS; } else { ret = AVERROR(EINVAL); goto err; } } if (av_find_info_tag(buf, sizeof(buf), "sndbuf", p)) { s->sndbuf = strtol(buf, NULL, 10); } if (av_find_info_tag(buf, sizeof(buf), "rcvbuf", p)) { s->rcvbuf = strtol(buf, NULL, 10); } if (av_find_info_tag(buf, sizeof(buf), "lossmaxttl", p)) { s->lossmaxttl = strtol(buf, NULL, 10); } if (av_find_info_tag(buf, sizeof(buf), "minversion", p)) { s->minversion = strtol(buf, NULL, 0); } if (av_find_info_tag(buf, sizeof(buf), "streamid", p)) { av_freep(&s->streamid); s->streamid = av_strdup(buf); if (!s->streamid) { ret = AVERROR(ENOMEM); goto err; } } if (av_find_info_tag(buf, sizeof(buf), "smoother", p)) { av_freep(&s->smoother); s->smoother = av_strdup(buf); if(!s->smoother) { ret = AVERROR(ENOMEM); goto err; } } if (av_find_info_tag(buf, sizeof(buf), "messageapi", p)) { s->messageapi = strtol(buf, NULL, 10); } if (av_find_info_tag(buf, sizeof(buf), "transtype", p)) { if (!strcmp(buf, "live")) { s->transtype = SRTT_LIVE; } else if (!strcmp(buf, "file")) { s->transtype = SRTT_FILE; } else { ret = AVERROR(EINVAL); goto err; } } if (av_find_info_tag(buf, sizeof(buf), "linger", p)) { s->linger = strtol(buf, NULL, 10); } } ret = libsrt_setup(h, uri, flags); if (ret < 0) goto err; return 0; err: av_freep(&s->smoother); av_freep(&s->streamid); srt_cleanup(); return ret; } static int libsrt_read(URLContext *h, uint8_t *buf, int size) { SRTContext *s = h->priv_data; int ret; if (!(h->flags & AVIO_FLAG_NONBLOCK)) { ret = libsrt_network_wait_fd_timeout(h, s->eid, 0, h->rw_timeout, &h->interrupt_callback); if (ret) return ret; } ret = srt_recvmsg(s->fd, buf, size); if (ret < 0) { ret = libsrt_neterrno(h); } return ret; } static int libsrt_write(URLContext *h, const uint8_t *buf, int size) { SRTContext *s = h->priv_data; int ret; if (!(h->flags & AVIO_FLAG_NONBLOCK)) { ret = libsrt_network_wait_fd_timeout(h, s->eid, 1, h->rw_timeout, &h->interrupt_callback); if (ret) return ret; } ret = srt_sendmsg(s->fd, buf, size, -1, 1); if (ret < 0) { ret = libsrt_neterrno(h); } return ret; } static int libsrt_close(URLContext *h) { SRTContext *s = h->priv_data; srt_epoll_release(s->eid); srt_close(s->fd); srt_cleanup(); return 0; } static const AVClass libsrt_class = { .class_name = "libsrt", .option = libsrt_options, .version = LIBAVUTIL_VERSION_INT, }; const URLProtocol ff_libsrt_protocol = { .name = "srt", .url_open = libsrt_open, .url_read = libsrt_read, .url_write = libsrt_write, .url_close = libsrt_close, .priv_data_size = sizeof(SRTContext), .flags = URL_PROTOCOL_FLAG_NETWORK, .priv_data_class = &libsrt_class, };