libavformat/libsrt.c

   1 /*
   2  * This file is part of FFmpeg.
   3  *
   4  * FFmpeg is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * FFmpeg is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with FFmpeg; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17  */
  18
  19 /**
  20  * @file
  21  * Haivision Open SRT (Secure Reliable Transport) protocol
  22  */
  23
  24 #include <srt/srt.h>
  25
  26 #include "libavutil/mem.h"
  27 #include "libavutil/opt.h"
  28 #include "libavutil/parseutils.h"
  29 #include "libavutil/time.h"
  30
  31 #include "avformat.h"
  32 #include "internal.h"
  33 #include "network.h"
  34 #include "os_support.h"
  35 #include "url.h"
  36 #include "urldecode.h"
  37
  38 /* This is for MPEG-TS and it's a default SRTO_PAYLOADSIZE for SRTT_LIVE (8 TS packets) */
  39 #ifndef SRT_LIVE_DEFAULT_PAYLOAD_SIZE
  40 #define SRT_LIVE_DEFAULT_PAYLOAD_SIZE 1316
  41 #endif
  42
  43 /* This is the maximum payload size for Live mode, should you have a different payload type than MPEG-TS */
  44 #ifndef SRT_LIVE_MAX_PAYLOAD_SIZE
  45 #define SRT_LIVE_MAX_PAYLOAD_SIZE 1456
  46 #endif
  47
  48 enum SRTMode {
  49     SRT_MODE_CALLER = 0,
  50     SRT_MODE_LISTENER = 1,
  51     SRT_MODE_RENDEZVOUS = 2
  52 };
  53
  54 typedef struct SRTContext {
  55     const AVClass *class;
  56     int fd;
  57     int eid;
  58     int64_t rw_timeout;
  59     int64_t listen_timeout;
  60     int recv_buffer_size;
  61     int send_buffer_size;
  62
  63     int64_t maxbw;
  64     int pbkeylen;
  65     char *passphrase;
  66 #if SRT_VERSION_VALUE >= 0x010302
  67     int enforced_encryption;
  68     int kmrefreshrate;
  69     int kmpreannounce;
  70     int64_t snddropdelay;
  71 #endif
  72     int mss;
  73     int ffs;
  74     int ipttl;
  75     int iptos;
  76     int64_t inputbw;
  77     int oheadbw;
  78     int64_t latency;
  79     int tlpktdrop;
  80     int nakreport;
  81     int64_t connect_timeout;
  82     int payload_size;
  83     int64_t rcvlatency;
  84     int64_t peerlatency;
  85     enum SRTMode mode;
  86     int sndbuf;
  87     int rcvbuf;
  88     int lossmaxttl;
  89     int minversion;
  90     char *streamid;
  91     char *smoother;
  92     int messageapi;
  93     SRT_TRANSTYPE transtype;
  94     int linger;
  95     int tsbpd;
  96 } SRTContext;
  97
  98 #define D AV_OPT_FLAG_DECODING_PARAM
  99 #define E AV_OPT_FLAG_ENCODING_PARAM
 100 #define OFFSET(x) offsetof(SRTContext, x)
 101 static const AVOption libsrt_options[] = {
 102     { "timeout",        "Timeout of socket I/O operations (in microseconds)",                   OFFSET(rw_timeout),       AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
 103     { "listen_timeout", "Connection awaiting timeout (in microseconds)" ,                       OFFSET(listen_timeout),   AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
 104     { "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 },
 105     { "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 },
 106     { "pkt_size",       "Maximum SRT packet size",                                              OFFSET(payload_size),     AV_OPT_TYPE_INT,      { .i64 = -1 }, -1, SRT_LIVE_MAX_PAYLOAD_SIZE, .flags = D|E, .unit = "payload_size" },
 107     { "payload_size",   "Maximum SRT packet size",                                              OFFSET(payload_size),     AV_OPT_TYPE_INT,      { .i64 = -1 }, -1, SRT_LIVE_MAX_PAYLOAD_SIZE, .flags = D|E, .unit = "payload_size" },
 108     { "ts_size",        NULL, 0, AV_OPT_TYPE_CONST,  { .i64 = SRT_LIVE_DEFAULT_PAYLOAD_SIZE }, INT_MIN, INT_MAX, .flags = D|E, .unit = "payload_size" },
 109     { "max_size",       NULL, 0, AV_OPT_TYPE_CONST,  { .i64 = SRT_LIVE_MAX_PAYLOAD_SIZE },     INT_MIN, INT_MAX, .flags = D|E, .unit = "payload_size" },
 110     { "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 },
 111     { "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 },
 112     { "passphrase",     "Crypto PBKDF2 Passphrase size[0,10..64] 0:disable crypto",             OFFSET(passphrase),       AV_OPT_TYPE_STRING,   { .str = NULL },              .flags = D|E },
 113 #if SRT_VERSION_VALUE >= 0x010302
 114     { "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 },
 115     { "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 },
 116     { "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 },
 117     { "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 },
 118 #endif
 119     { "mss",            "The Maximum Segment Size",                                             OFFSET(mss),              AV_OPT_TYPE_INT,      { .i64 = -1 }, -1, 1500,      .flags = D|E },
 120     { "ffs",            "Flight flag size (window size) (in bytes)",                            OFFSET(ffs),              AV_OPT_TYPE_INT,      { .i64 = -1 }, -1, INT_MAX,   .flags = D|E },
 121     { "ipttl",          "IP Time To Live",                                                      OFFSET(ipttl),            AV_OPT_TYPE_INT,      { .i64 = -1 }, -1, 255,       .flags = D|E },
 122     { "iptos",          "IP Type of Service",                                                   OFFSET(iptos),            AV_OPT_TYPE_INT,      { .i64 = -1 }, -1, 255,       .flags = D|E },
 123     { "inputbw",        "Estimated input stream rate",                                          OFFSET(inputbw),          AV_OPT_TYPE_INT64,    { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
 124     { "oheadbw",        "MaxBW ceiling based on % over input stream rate",                      OFFSET(oheadbw),          AV_OPT_TYPE_INT,      { .i64 = -1 }, -1, 100,       .flags = D|E },
 125     { "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 },
 126     { "tsbpddelay",     "deprecated, same effect as latency option",                            OFFSET(latency),          AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
 127     { "rcvlatency",     "receive latency (in microseconds)",                                    OFFSET(rcvlatency),       AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
 128     { "peerlatency",    "peer latency (in microseconds)",                                       OFFSET(peerlatency),      AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
 129     { "tlpktdrop",      "Enable too-late pkt drop",                                             OFFSET(tlpktdrop),        AV_OPT_TYPE_BOOL,     { .i64 = -1 }, -1, 1,         .flags = D|E },
 130     { "nakreport",      "Enable receiver to send periodic NAK reports",                         OFFSET(nakreport),        AV_OPT_TYPE_BOOL,     { .i64 = -1 }, -1, 1,         .flags = D|E },
 131     { "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 },
 132     { "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, .unit = "mode" },
 133     { "caller",         NULL, 0, AV_OPT_TYPE_CONST,  { .i64 = SRT_MODE_CALLER },     INT_MIN, INT_MAX, .flags = D|E, .unit = "mode" },
 134     { "listener",       NULL, 0, AV_OPT_TYPE_CONST,  { .i64 = SRT_MODE_LISTENER },   INT_MIN, INT_MAX, .flags = D|E, .unit = "mode" },
 135     { "rendezvous",     NULL, 0, AV_OPT_TYPE_CONST,  { .i64 = SRT_MODE_RENDEZVOUS }, INT_MIN, INT_MAX, .flags = D|E, .unit = "mode" },
 136     { "sndbuf",         "Send buffer size (in bytes)",                                          OFFSET(sndbuf),           AV_OPT_TYPE_INT,      { .i64 = -1 }, -1, INT_MAX,   .flags = D|E },
 137     { "rcvbuf",         "Receive buffer size (in bytes)",                                       OFFSET(rcvbuf),           AV_OPT_TYPE_INT,      { .i64 = -1 }, -1, INT_MAX,   .flags = D|E },
 138     { "lossmaxttl",     "Maximum possible packet reorder tolerance",                            OFFSET(lossmaxttl),       AV_OPT_TYPE_INT,      { .i64 = -1 }, -1, INT_MAX,   .flags = D|E },
 139     { "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 },
 140     { "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 },
 141     { "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 },
 142     { "smoother",       "The type of Smoother used for the transmission for that socket",       OFFSET(smoother),         AV_OPT_TYPE_STRING,   { .str = NULL },              .flags = D|E },
 143     { "messageapi",     "Enable message API",                                                   OFFSET(messageapi),       AV_OPT_TYPE_BOOL,     { .i64 = -1 }, -1, 1,         .flags = D|E },
 144     { "transtype",      "The transmission type for the socket",                                 OFFSET(transtype),        AV_OPT_TYPE_INT,      { .i64 = SRTT_INVALID }, SRTT_LIVE, SRTT_INVALID, .flags = D|E, .unit = "transtype" },
 145     { "live",           NULL, 0, AV_OPT_TYPE_CONST,  { .i64 = SRTT_LIVE }, INT_MIN, INT_MAX, .flags = D|E, .unit = "transtype" },
 146     { "file",           NULL, 0, AV_OPT_TYPE_CONST,  { .i64 = SRTT_FILE }, INT_MIN, INT_MAX, .flags = D|E, .unit = "transtype" },
 147     { "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 },
 148     { "tsbpd",          "Timestamp-based packet delivery",                                      OFFSET(tsbpd),            AV_OPT_TYPE_BOOL,     { .i64 = -1 }, -1, 1,         .flags = D|E },
 149     { NULL }
 150 };
 151
 152 static int libsrt_neterrno(URLContext *h)
 153 {
 154     int os_errno;
 155     int err = srt_getlasterror(&os_errno);
 156     if (err == SRT_EASYNCRCV || err == SRT_EASYNCSND)
 157         return AVERROR(EAGAIN);
 158     av_log(h, AV_LOG_ERROR, "%s\n", srt_getlasterror_str());
 159     return os_errno ? AVERROR(os_errno) : AVERROR_UNKNOWN;
 160 }
 161
 162 static int libsrt_getsockopt(URLContext *h, int fd, SRT_SOCKOPT optname, const char * optnamestr, void * optval, int * optlen)
 163 {
 164     if (srt_getsockopt(fd, 0, optname, optval, optlen) < 0) {
 165         av_log(h, AV_LOG_ERROR, "failed to get option %s on socket: %s\n", optnamestr, srt_getlasterror_str());
 166         return AVERROR(EIO);
 167     }
 168     return 0;
 169 }
 170
 171 static int libsrt_socket_nonblock(int socket, int enable)
 172 {
 173     int ret, blocking = enable ? 0 : 1;
 174     /* Setting SRTO_{SND,RCV}SYN options to 1 enable blocking mode, setting them to 0 enable non-blocking mode. */
 175     ret = srt_setsockopt(socket, 0, SRTO_SNDSYN, &blocking, sizeof(blocking));
 176     if (ret < 0)
 177         return ret;
 178     return srt_setsockopt(socket, 0, SRTO_RCVSYN, &blocking, sizeof(blocking));
 179 }
 180
 181 static int libsrt_epoll_create(URLContext *h, int fd, int write)
 182 {
 183     int modes = SRT_EPOLL_ERR | (write ? SRT_EPOLL_OUT : SRT_EPOLL_IN);
 184     int eid = srt_epoll_create();
 185     if (eid < 0)
 186         return libsrt_neterrno(h);
 187     if (srt_epoll_add_usock(eid, fd, &modes) < 0) {
 188         srt_epoll_release(eid);
 189         return libsrt_neterrno(h);
 190     }
 191     return eid;
 192 }
 193
 194 static int libsrt_network_wait_fd(URLContext *h, int eid, int write)
 195 {
 196     int ret, len = 1, errlen = 1;
 197     SRTSOCKET ready[1];
 198     SRTSOCKET error[1];
 199
 200     if (write) {
 201         ret = srt_epoll_wait(eid, error, &errlen, ready, &len, POLLING_TIME, 0, 0, 0, 0);
 202     } else {
 203         ret = srt_epoll_wait(eid, ready, &len, error, &errlen, POLLING_TIME, 0, 0, 0, 0);
 204     }
 205     if (ret < 0) {
 206         if (srt_getlasterror(NULL) == SRT_ETIMEOUT)
 207             ret = AVERROR(EAGAIN);
 208         else
 209             ret = libsrt_neterrno(h);
 210     } else {
 211         ret = errlen ? AVERROR(EIO) : 0;
 212     }
 213     return ret;
 214 }
 215
 216 /* TODO de-duplicate code from ff_network_wait_fd_timeout() */
 217
 218 static int libsrt_network_wait_fd_timeout(URLContext *h, int eid, int write, int64_t timeout, AVIOInterruptCB *int_cb)
 219 {
 220     int ret;
 221     int64_t wait_start = 0;
 222
 223     while (1) {
 224         if (ff_check_interrupt(int_cb))
 225             return AVERROR_EXIT;
 226         ret = libsrt_network_wait_fd(h, eid, write);
 227         if (ret != AVERROR(EAGAIN))
 228             return ret;
 229         if (timeout > 0) {
 230             if (!wait_start)
 231                 wait_start = av_gettime_relative();
 232             else if (av_gettime_relative() - wait_start > timeout)
 233                 return AVERROR(ETIMEDOUT);
 234         }
 235     }
 236 }
 237
 238 static int libsrt_listen(int eid, int fd, const struct sockaddr *addr, socklen_t addrlen, URLContext *h, int64_t timeout)
 239 {
 240     int ret;
 241     int reuse = 1;
 242     /* Max streamid length plus an extra space for the terminating null character */
 243     char streamid[513];
 244     int streamid_len = sizeof(streamid);
 245     if (srt_setsockopt(fd, SOL_SOCKET, SRTO_REUSEADDR, &reuse, sizeof(reuse))) {
 246         av_log(h, AV_LOG_WARNING, "setsockopt(SRTO_REUSEADDR) failed\n");
 247     }
 248     if (srt_bind(fd, addr, addrlen))
 249         return libsrt_neterrno(h);
 250
 251     if (srt_listen(fd, 1))
 252         return libsrt_neterrno(h);
 253
 254     ret = libsrt_network_wait_fd_timeout(h, eid, 0, timeout, &h->interrupt_callback);
 255     if (ret < 0)
 256         return ret;
 257
 258     ret = srt_accept(fd, NULL, NULL);
 259     if (ret < 0)
 260         return libsrt_neterrno(h);
 261     if (libsrt_socket_nonblock(ret, 1) < 0)
 262         av_log(h, AV_LOG_DEBUG, "libsrt_socket_nonblock failed\n");
 263     if (!libsrt_getsockopt(h, ret, SRTO_STREAMID, "SRTO_STREAMID", streamid, &streamid_len))
 264         /* Note: returned streamid_len doesn't count the terminating null character */
 265         av_log(h, AV_LOG_VERBOSE, "accept streamid [%s], length %d\n", streamid, streamid_len);
 266
 267     return ret;
 268 }
 269
 270 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)
 271 {
 272     int ret;
 273
 274     if (srt_connect(fd, addr, addrlen) < 0)
 275         return libsrt_neterrno(h);
 276
 277     ret = libsrt_network_wait_fd_timeout(h, eid, 1, timeout, &h->interrupt_callback);
 278     if (ret < 0) {
 279         if (will_try_next) {
 280             av_log(h, AV_LOG_WARNING,
 281                    "Connection to %s failed (%s), trying next address\n",
 282                    h->filename, av_err2str(ret));
 283         } else {
 284             av_log(h, AV_LOG_ERROR, "Connection to %s failed: %s\n",
 285                    h->filename, av_err2str(ret));
 286         }
 287     }
 288     return ret;
 289 }
 290
 291 static int libsrt_setsockopt(URLContext *h, int fd, SRT_SOCKOPT optname, const char * optnamestr, const void * optval, int optlen)
 292 {
 293     if (srt_setsockopt(fd, 0, optname, optval, optlen) < 0) {
 294         av_log(h, AV_LOG_ERROR, "failed to set option %s on socket: %s\n", optnamestr, srt_getlasterror_str());
 295         return AVERROR(EIO);
 296     }
 297     return 0;
 298 }
 299
 300 /* - The "POST" options can be altered any time on a connected socket.
 301      They MAY have also some meaning when set prior to connecting; such
 302      option is SRTO_RCVSYN, which makes connect/accept call asynchronous.
 303      Because of that this option is treated special way in this app. */
 304 static int libsrt_set_options_post(URLContext *h, int fd)
 305 {
 306     SRTContext *s = h->priv_data;
 307
 308     if ((s->inputbw >= 0 && libsrt_setsockopt(h, fd, SRTO_INPUTBW, "SRTO_INPUTBW", &s->inputbw, sizeof(s->inputbw)) < 0) ||
 309         (s->oheadbw >= 0 && libsrt_setsockopt(h, fd, SRTO_OHEADBW, "SRTO_OHEADBW", &s->oheadbw, sizeof(s->oheadbw)) < 0)) {
 310         return AVERROR(EIO);
 311     }
 312     return 0;
 313 }
 314
 315 /* - The "PRE" options must be set prior to connecting and can't be altered
 316      on a connected socket, however if set on a listening socket, they are
 317      derived by accept-ed socket. */
 318 static int libsrt_set_options_pre(URLContext *h, int fd)
 319 {
 320     SRTContext *s = h->priv_data;
 321     int yes = 1;
 322     int latency = s->latency / 1000;
 323     int rcvlatency = s->rcvlatency / 1000;
 324     int peerlatency = s->peerlatency / 1000;
 325 #if SRT_VERSION_VALUE >= 0x010302
 326     int snddropdelay = s->snddropdelay > 0 ? s->snddropdelay / 1000 : s->snddropdelay;
 327 #endif
 328     int connect_timeout = s->connect_timeout;
 329
 330     if ((s->mode == SRT_MODE_RENDEZVOUS && libsrt_setsockopt(h, fd, SRTO_RENDEZVOUS, "SRTO_RENDEZVOUS", &yes, sizeof(yes)) < 0) ||
 331         (s->transtype != SRTT_INVALID && libsrt_setsockopt(h, fd, SRTO_TRANSTYPE, "SRTO_TRANSTYPE", &s->transtype, sizeof(s->transtype)) < 0) ||
 332         (s->maxbw >= 0 && libsrt_setsockopt(h, fd, SRTO_MAXBW, "SRTO_MAXBW", &s->maxbw, sizeof(s->maxbw)) < 0) ||
 333         (s->pbkeylen >= 0 && libsrt_setsockopt(h, fd, SRTO_PBKEYLEN, "SRTO_PBKEYLEN", &s->pbkeylen, sizeof(s->pbkeylen)) < 0) ||
 334         (s->passphrase && libsrt_setsockopt(h, fd, SRTO_PASSPHRASE, "SRTO_PASSPHRASE", s->passphrase, strlen(s->passphrase)) < 0) ||
 335 #if SRT_VERSION_VALUE >= 0x010302
 336 #if SRT_VERSION_VALUE >= 0x010401
 337         (s->enforced_encryption >= 0 && libsrt_setsockopt(h, fd, SRTO_ENFORCEDENCRYPTION, "SRTO_ENFORCEDENCRYPTION", &s->enforced_encryption, sizeof(s->enforced_encryption)) < 0) ||
 338 #else
 339         /* SRTO_STRICTENC == SRTO_ENFORCEDENCRYPTION (53), but for compatibility, we used SRTO_STRICTENC */
 340         (s->enforced_encryption >= 0 && libsrt_setsockopt(h, fd, SRTO_STRICTENC, "SRTO_STRICTENC", &s->enforced_encryption, sizeof(s->enforced_encryption)) < 0) ||
 341 #endif
 342         (s->kmrefreshrate >= 0 && libsrt_setsockopt(h, fd, SRTO_KMREFRESHRATE, "SRTO_KMREFRESHRATE", &s->kmrefreshrate, sizeof(s->kmrefreshrate)) < 0) ||
 343         (s->kmpreannounce >= 0 && libsrt_setsockopt(h, fd, SRTO_KMPREANNOUNCE, "SRTO_KMPREANNOUNCE", &s->kmpreannounce, sizeof(s->kmpreannounce)) < 0) ||
 344         (s->snddropdelay  >=-1 && libsrt_setsockopt(h, fd, SRTO_SNDDROPDELAY,  "SRTO_SNDDROPDELAY",  &snddropdelay, sizeof(snddropdelay)) < 0) ||
 345 #endif
 346         (s->mss >= 0 && libsrt_setsockopt(h, fd, SRTO_MSS, "SRTO_MSS", &s->mss, sizeof(s->mss)) < 0) ||
 347         (s->ffs >= 0 && libsrt_setsockopt(h, fd, SRTO_FC, "SRTO_FC", &s->ffs, sizeof(s->ffs)) < 0) ||
 348         (s->ipttl >= 0 && libsrt_setsockopt(h, fd, SRTO_IPTTL, "SRTO_IPTTL", &s->ipttl, sizeof(s->ipttl)) < 0) ||
 349         (s->iptos >= 0 && libsrt_setsockopt(h, fd, SRTO_IPTOS, "SRTO_IPTOS", &s->iptos, sizeof(s->iptos)) < 0) ||
 350         (s->latency >= 0 && libsrt_setsockopt(h, fd, SRTO_LATENCY, "SRTO_LATENCY", &latency, sizeof(latency)) < 0) ||
 351         (s->rcvlatency >= 0 && libsrt_setsockopt(h, fd, SRTO_RCVLATENCY, "SRTO_RCVLATENCY", &rcvlatency, sizeof(rcvlatency)) < 0) ||
 352         (s->peerlatency >= 0 && libsrt_setsockopt(h, fd, SRTO_PEERLATENCY, "SRTO_PEERLATENCY", &peerlatency, sizeof(peerlatency)) < 0) ||
 353         (s->tlpktdrop >= 0 && libsrt_setsockopt(h, fd, SRTO_TLPKTDROP, "SRTO_TLPKTDROP", &s->tlpktdrop, sizeof(s->tlpktdrop)) < 0) ||
 354         (s->nakreport >= 0 && libsrt_setsockopt(h, fd, SRTO_NAKREPORT, "SRTO_NAKREPORT", &s->nakreport, sizeof(s->nakreport)) < 0) ||
 355         (connect_timeout >= 0 && libsrt_setsockopt(h, fd, SRTO_CONNTIMEO, "SRTO_CONNTIMEO", &connect_timeout, sizeof(connect_timeout)) <0 ) ||
 356         (s->sndbuf >= 0 && libsrt_setsockopt(h, fd, SRTO_SNDBUF, "SRTO_SNDBUF", &s->sndbuf, sizeof(s->sndbuf)) < 0) ||
 357         (s->rcvbuf >= 0 && libsrt_setsockopt(h, fd, SRTO_RCVBUF, "SRTO_RCVBUF", &s->rcvbuf, sizeof(s->rcvbuf)) < 0) ||
 358         (s->lossmaxttl >= 0 && libsrt_setsockopt(h, fd, SRTO_LOSSMAXTTL, "SRTO_LOSSMAXTTL", &s->lossmaxttl, sizeof(s->lossmaxttl)) < 0) ||
 359         (s->minversion >= 0 && libsrt_setsockopt(h, fd, SRTO_MINVERSION, "SRTO_MINVERSION", &s->minversion, sizeof(s->minversion)) < 0) ||
 360         (s->streamid && libsrt_setsockopt(h, fd, SRTO_STREAMID, "SRTO_STREAMID", s->streamid, strlen(s->streamid)) < 0) ||
 361 #if SRT_VERSION_VALUE >= 0x010401
 362         (s->smoother && libsrt_setsockopt(h, fd, SRTO_CONGESTION, "SRTO_CONGESTION", s->smoother, strlen(s->smoother)) < 0) ||
 363 #else
 364         (s->smoother && libsrt_setsockopt(h, fd, SRTO_SMOOTHER, "SRTO_SMOOTHER", s->smoother, strlen(s->smoother)) < 0) ||
 365 #endif
 366         (s->messageapi >= 0 && libsrt_setsockopt(h, fd, SRTO_MESSAGEAPI, "SRTO_MESSAGEAPI", &s->messageapi, sizeof(s->messageapi)) < 0) ||
 367         (s->payload_size >= 0 && libsrt_setsockopt(h, fd, SRTO_PAYLOADSIZE, "SRTO_PAYLOADSIZE", &s->payload_size, sizeof(s->payload_size)) < 0) ||
 368         ((h->flags & AVIO_FLAG_WRITE) && libsrt_setsockopt(h, fd, SRTO_SENDER, "SRTO_SENDER", &yes, sizeof(yes)) < 0) ||
 369         (s->tsbpd >= 0 && libsrt_setsockopt(h, fd, SRTO_TSBPDMODE, "SRTO_TSBPDMODE", &s->tsbpd, sizeof(s->tsbpd)) < 0)) {
 370         return AVERROR(EIO);
 371     }
 372
 373     if (s->linger >= 0) {
 374         struct linger lin;
 375         lin.l_linger = s->linger;
 376         lin.l_onoff  = lin.l_linger > 0 ? 1 : 0;
 377         if (libsrt_setsockopt(h, fd, SRTO_LINGER, "SRTO_LINGER", &lin, sizeof(lin)) < 0)
 378             return AVERROR(EIO);
 379     }
 380     return 0;
 381 }
 382
 383
 384 static int libsrt_setup(URLContext *h, const char *uri, int flags)
 385 {
 386     struct addrinfo hints = { 0 }, *ai, *cur_ai;
 387     int port, fd;
 388     SRTContext *s = h->priv_data;
 389     int ret;
 390     char hostname[1024],proto[1024],path[1024];
 391     char portstr[10];
 392     int64_t open_timeout = 0;
 393     int eid;
 394
 395     av_url_split(proto, sizeof(proto), NULL, 0, hostname, sizeof(hostname),
 396         &port, path, sizeof(path), uri);
 397     if (strcmp(proto, "srt"))
 398         return AVERROR(EINVAL);
 399     if (port <= 0 || port >= 65536) {
 400         av_log(h, AV_LOG_ERROR, "Port missing in uri\n");
 401         return AVERROR(EINVAL);
 402     }
 403     if (s->rw_timeout >= 0) {
 404         open_timeout = h->rw_timeout = s->rw_timeout;
 405     }
 406     hints.ai_family = AF_UNSPEC;
 407     hints.ai_socktype = SOCK_DGRAM;
 408     snprintf(portstr, sizeof(portstr), "%d", port);
 409     if (s->mode == SRT_MODE_LISTENER)
 410         hints.ai_flags |= AI_PASSIVE;
 411     ret = getaddrinfo(hostname[0] ? hostname : NULL, portstr, &hints, &ai);
 412     if (ret) {
 413         av_log(h, AV_LOG_ERROR,
 414                "Failed to resolve hostname %s: %s\n",
 415                hostname, gai_strerror(ret));
 416         return AVERROR(EIO);
 417     }
 418
 419     cur_ai = ai;
 420
 421  restart:
 422
 423 #if SRT_VERSION_VALUE >= 0x010401
 424     fd = srt_create_socket();
 425 #else
 426     fd = srt_socket(cur_ai->ai_family, cur_ai->ai_socktype, 0);
 427 #endif
 428     if (fd < 0) {
 429         ret = libsrt_neterrno(h);
 430         goto fail;
 431     }
 432
 433     if ((ret = libsrt_set_options_pre(h, fd)) < 0) {
 434         goto fail;
 435     }
 436
 437     /* Set the socket's send or receive buffer sizes, if specified.
 438        If unspecified or setting fails, system default is used. */
 439     if (s->recv_buffer_size > 0) {
 440         srt_setsockopt(fd, SOL_SOCKET, SRTO_UDP_RCVBUF, &s->recv_buffer_size, sizeof (s->recv_buffer_size));
 441     }
 442     if (s->send_buffer_size > 0) {
 443         srt_setsockopt(fd, SOL_SOCKET, SRTO_UDP_SNDBUF, &s->send_buffer_size, sizeof (s->send_buffer_size));
 444     }
 445     if (libsrt_socket_nonblock(fd, 1) < 0)
 446         av_log(h, AV_LOG_DEBUG, "libsrt_socket_nonblock failed\n");
 447
 448     if (s->mode == SRT_MODE_LISTENER) {
 449         int read_eid = ret = libsrt_epoll_create(h, fd, 0);
 450         if (ret < 0)
 451             goto fail1;
 452         // multi-client
 453         ret = libsrt_listen(read_eid, fd, cur_ai->ai_addr, cur_ai->ai_addrlen, h, s->listen_timeout);
 454         srt_epoll_release(read_eid);
 455         if (ret < 0)
 456             goto fail1;
 457         srt_close(fd);
 458         fd = ret;
 459     } else {
 460         int write_eid = ret = libsrt_epoll_create(h, fd, 1);
 461         if (ret < 0)
 462             goto fail1;
 463         if (s->mode == SRT_MODE_RENDEZVOUS) {
 464             if (srt_bind(fd, cur_ai->ai_addr, cur_ai->ai_addrlen)) {
 465                 ret = libsrt_neterrno(h);
 466                 srt_epoll_release(write_eid);
 467                 goto fail1;
 468             }
 469         }
 470
 471         ret = libsrt_listen_connect(write_eid, fd, cur_ai->ai_addr, cur_ai->ai_addrlen,
 472                                     open_timeout, h, !!cur_ai->ai_next);
 473         srt_epoll_release(write_eid);
 474         if (ret < 0) {
 475             if (ret == AVERROR_EXIT)
 476                 goto fail1;
 477             else
 478                 goto fail;
 479         }
 480     }
 481     if ((ret = libsrt_set_options_post(h, fd)) < 0) {
 482         goto fail;
 483     }
 484
 485     if (flags & AVIO_FLAG_WRITE) {
 486         int packet_size = 0;
 487         int optlen = sizeof(packet_size);
 488         ret = libsrt_getsockopt(h, fd, SRTO_PAYLOADSIZE, "SRTO_PAYLOADSIZE", &packet_size, &optlen);
 489         if (ret < 0)
 490             goto fail1;
 491         if (packet_size > 0)
 492             h->max_packet_size = packet_size;
 493     }
 494
 495     ret = eid = libsrt_epoll_create(h, fd, flags & AVIO_FLAG_WRITE);
 496     if (eid < 0)
 497         goto fail1;
 498
 499     h->is_streamed = 1;
 500     s->fd = fd;
 501     s->eid = eid;
 502
 503     freeaddrinfo(ai);
 504     return 0;
 505
 506  fail:
 507     if (cur_ai->ai_next) {
 508         /* Retry with the next sockaddr */
 509         cur_ai = cur_ai->ai_next;
 510         if (fd >= 0)
 511             srt_close(fd);
 512         ret = 0;
 513         goto restart;
 514     }
 515  fail1:
 516     if (fd >= 0)
 517         srt_close(fd);
 518     freeaddrinfo(ai);
 519     return ret;
 520 }
 521
 522 static int libsrt_open(URLContext *h, const char *uri, int flags)
 523 {
 524     SRTContext *s = h->priv_data;
 525     const char * p;
 526     int ret = 0;
 527
 528     if (srt_startup() < 0) {
 529         return AVERROR_UNKNOWN;
 530     }
 531
 532     /* SRT options (srt/srt.h) */
 533     p = strchr(uri, '?');
 534     if (p) {
 535         ret = ff_parse_opts_from_query_string(s, p, 0);
 536         if (ret < 0)
 537             goto err;
 538     }
 539     ret = libsrt_setup(h, uri, flags);
 540     if (ret < 0)
 541         goto err;
 542     return 0;
 543
 544 err:
 545     srt_cleanup();
 546     return ret;
 547 }
 548
 549 static int libsrt_read(URLContext *h, uint8_t *buf, int size)
 550 {
 551     SRTContext *s = h->priv_data;
 552     int ret;
 553
 554     if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
 555         ret = libsrt_network_wait_fd_timeout(h, s->eid, 0, h->rw_timeout, &h->interrupt_callback);
 556         if (ret)
 557             return ret;
 558     }
 559
 560     ret = srt_recvmsg(s->fd, buf, size);
 561     if (ret < 0) {
 562         ret = libsrt_neterrno(h);
 563     }
 564
 565     return ret;
 566 }
 567
 568 static int libsrt_write(URLContext *h, const uint8_t *buf, int size)
 569 {
 570     SRTContext *s = h->priv_data;
 571     int ret;
 572
 573     if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
 574         ret = libsrt_network_wait_fd_timeout(h, s->eid, 1, h->rw_timeout, &h->interrupt_callback);
 575         if (ret)
 576             return ret;
 577     }
 578
 579     ret = srt_sendmsg(s->fd, buf, size, -1, 1);
 580     if (ret < 0) {
 581         ret = libsrt_neterrno(h);
 582     }
 583
 584     return ret;
 585 }
 586
 587 static int libsrt_close(URLContext *h)
 588 {
 589     SRTContext *s = h->priv_data;
 590
 591     srt_epoll_release(s->eid);
 592     srt_close(s->fd);
 593
 594     srt_cleanup();
 595
 596     return 0;
 597 }
 598
 599 static const AVClass libsrt_class = {
 600     .class_name = "libsrt",
 601     .item_name  = av_default_item_name,
 602     .option     = libsrt_options,
 603     .version    = LIBAVUTIL_VERSION_INT,
 604 };
 605
 606 const URLProtocol ff_libsrt_protocol = {
 607     .name                = "srt",
 608     .url_open            = libsrt_open,
 609     .url_read            = libsrt_read,
 610     .url_write           = libsrt_write,
 611     .url_close           = libsrt_close,
 612     .priv_data_size      = sizeof(SRTContext),
 613     .flags               = URL_PROTOCOL_FLAG_NETWORK,
 614     .priv_data_class     = &libsrt_class,
 615 };