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/avassert.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
  37 /* This is for MPEG-TS and it's a default SRTO_PAYLOADSIZE for SRTT_LIVE (8 TS packets) */
  38 #ifndef SRT_LIVE_DEFAULT_PAYLOAD_SIZE
  39 #define SRT_LIVE_DEFAULT_PAYLOAD_SIZE 1316
  40 #endif
  41
  42 /* This is the maximum payload size for Live mode, should you have a different payload type than MPEG-TS */
  43 #ifndef SRT_LIVE_MAX_PAYLOAD_SIZE
  44 #define SRT_LIVE_MAX_PAYLOAD_SIZE 1456
  45 #endif
  46
  47 enum SRTMode {
  48     SRT_MODE_CALLER = 0,
  49     SRT_MODE_LISTENER = 1,
  50     SRT_MODE_RENDEZVOUS = 2
  51 };
  52
  53 typedef struct SRTContext {
  54     const AVClass *class;
  55     int fd;
  56     int listen_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 #endif
  71     int mss;
  72     int ffs;
  73     int ipttl;
  74     int iptos;
  75     int64_t inputbw;
  76     int oheadbw;
  77     int64_t latency;
  78     int tlpktdrop;
  79     int nakreport;
  80     int64_t connect_timeout;
  81     int payload_size;
  82     int64_t rcvlatency;
  83     int64_t peerlatency;
  84     enum SRTMode mode;
  85     int sndbuf;
  86     int rcvbuf;
  87     int lossmaxttl;
  88     int minversion;
  89     char *streamid;
  90     char *smoother;
  91     int messageapi;
  92     SRT_TRANSTYPE transtype;
  93     int linger;
  94 } SRTContext;
  95
  96 #define D AV_OPT_FLAG_DECODING_PARAM
  97 #define E AV_OPT_FLAG_ENCODING_PARAM
  98 #define OFFSET(x) offsetof(SRTContext, x)
  99 static const AVOption libsrt_options[] = {
 100     { "timeout",        "Timeout of socket I/O operations (in microseconds)",                   OFFSET(rw_timeout),       AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
 101     { "listen_timeout", "Connection awaiting timeout (in microseconds)" ,                       OFFSET(listen_timeout),   AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
 102     { "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 },
 103     { "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 },
 104     { "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" },
 105     { "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" },
 106     { "ts_size",        NULL, 0, AV_OPT_TYPE_CONST,  { .i64 = SRT_LIVE_DEFAULT_PAYLOAD_SIZE }, INT_MIN, INT_MAX, .flags = D|E, "payload_size" },
 107     { "max_size",       NULL, 0, AV_OPT_TYPE_CONST,  { .i64 = SRT_LIVE_MAX_PAYLOAD_SIZE },     INT_MIN, INT_MAX, .flags = D|E, "payload_size" },
 108     { "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 },
 109     { "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 },
 110     { "passphrase",     "Crypto PBKDF2 Passphrase size[0,10..64] 0:disable crypto",             OFFSET(passphrase),       AV_OPT_TYPE_STRING,   { .str = NULL },              .flags = D|E },
 111 #if SRT_VERSION_VALUE >= 0x010302
 112     { "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 },
 113     { "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 },
 114     { "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 },
 115 #endif
 116     { "mss",            "The Maximum Segment Size",                                             OFFSET(mss),              AV_OPT_TYPE_INT,      { .i64 = -1 }, -1, 1500,      .flags = D|E },
 117     { "ffs",            "Flight flag size (window size) (in bytes)",                            OFFSET(ffs),              AV_OPT_TYPE_INT,      { .i64 = -1 }, -1, INT_MAX,   .flags = D|E },
 118     { "ipttl",          "IP Time To Live",                                                      OFFSET(ipttl),            AV_OPT_TYPE_INT,      { .i64 = -1 }, -1, 255,       .flags = D|E },
 119     { "iptos",          "IP Type of Service",                                                   OFFSET(iptos),            AV_OPT_TYPE_INT,      { .i64 = -1 }, -1, 255,       .flags = D|E },
 120     { "inputbw",        "Estimated input stream rate",                                          OFFSET(inputbw),          AV_OPT_TYPE_INT64,    { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
 121     { "oheadbw",        "MaxBW ceiling based on % over input stream rate",                      OFFSET(oheadbw),          AV_OPT_TYPE_INT,      { .i64 = -1 }, -1, 100,       .flags = D|E },
 122     { "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 },
 123     { "tsbpddelay",     "deprecated, same effect as latency option",                            OFFSET(latency),          AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
 124     { "rcvlatency",     "receive latency (in microseconds)",                                    OFFSET(rcvlatency),       AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
 125     { "peerlatency",    "peer latency (in microseconds)",                                       OFFSET(peerlatency),      AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
 126     { "tlpktdrop",      "Enable receiver pkt drop",                                             OFFSET(tlpktdrop),        AV_OPT_TYPE_BOOL,     { .i64 = -1 }, -1, 1,         .flags = D|E },
 127     { "nakreport",      "Enable receiver to send periodic NAK reports",                         OFFSET(nakreport),        AV_OPT_TYPE_BOOL,     { .i64 = -1 }, -1, 1,         .flags = D|E },
 128     { "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 },
 129     { "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" },
 130     { "caller",         NULL, 0, AV_OPT_TYPE_CONST,  { .i64 = SRT_MODE_CALLER },     INT_MIN, INT_MAX, .flags = D|E, "mode" },
 131     { "listener",       NULL, 0, AV_OPT_TYPE_CONST,  { .i64 = SRT_MODE_LISTENER },   INT_MIN, INT_MAX, .flags = D|E, "mode" },
 132     { "rendezvous",     NULL, 0, AV_OPT_TYPE_CONST,  { .i64 = SRT_MODE_RENDEZVOUS }, INT_MIN, INT_MAX, .flags = D|E, "mode" },
 133     { "sndbuf",         "Send buffer size (in bytes)",                                          OFFSET(sndbuf),           AV_OPT_TYPE_INT,      { .i64 = -1 }, -1, INT_MAX,   .flags = D|E },
 134     { "rcvbuf",         "Receive buffer size (in bytes)",                                       OFFSET(rcvbuf),           AV_OPT_TYPE_INT,      { .i64 = -1 }, -1, INT_MAX,   .flags = D|E },
 135     { "lossmaxttl",     "Maximum possible packet reorder tolerance",                            OFFSET(lossmaxttl),       AV_OPT_TYPE_INT,      { .i64 = -1 }, -1, INT_MAX,   .flags = D|E },
 136     { "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 },
 137     { "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 },
 138     { "smoother",       "The type of Smoother used for the transmission for that socket",       OFFSET(smoother),         AV_OPT_TYPE_STRING,   { .str = NULL },              .flags = D|E },
 139     { "messageapi",     "Enable message API",                                                   OFFSET(messageapi),       AV_OPT_TYPE_BOOL,     { .i64 = -1 }, -1, 1,         .flags = D|E },
 140     { "transtype",      "The transmission type for the socket",                                 OFFSET(transtype),        AV_OPT_TYPE_INT,      { .i64 = SRTT_INVALID }, SRTT_LIVE, SRTT_INVALID, .flags = D|E, "transtype" },
 141     { "live",           NULL, 0, AV_OPT_TYPE_CONST,  { .i64 = SRTT_LIVE }, INT_MIN, INT_MAX, .flags = D|E, "transtype" },
 142     { "file",           NULL, 0, AV_OPT_TYPE_CONST,  { .i64 = SRTT_FILE }, INT_MIN, INT_MAX, .flags = D|E, "transtype" },
 143     { "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 },
 144     { NULL }
 145 };
 146
 147 static int libsrt_neterrno(URLContext *h)
 148 {
 149     int os_errno;
 150     int err = srt_getlasterror(&os_errno);
 151     if (err == SRT_EASYNCRCV || err == SRT_EASYNCSND)
 152         return AVERROR(EAGAIN);
 153     av_log(h, AV_LOG_ERROR, "%s\n", srt_getlasterror_str());
 154     return os_errno ? AVERROR(os_errno) : AVERROR_UNKNOWN;
 155 }
 156
 157 static int libsrt_socket_nonblock(int socket, int enable)
 158 {
 159     int ret, blocking = enable ? 0 : 1;
 160     /* Setting SRTO_{SND,RCV}SYN options to 1 enable blocking mode, setting them to 0 enable non-blocking mode. */
 161     ret = srt_setsockopt(socket, 0, SRTO_SNDSYN, &blocking, sizeof(blocking));
 162     if (ret < 0)
 163         return ret;
 164     return srt_setsockopt(socket, 0, SRTO_RCVSYN, &blocking, sizeof(blocking));
 165 }
 166
 167 static int libsrt_network_wait_fd(URLContext *h, int eid, int fd, int write)
 168 {
 169     int ret, len = 1, errlen = 1;
 170     int modes = SRT_EPOLL_ERR | (write ? SRT_EPOLL_OUT : SRT_EPOLL_IN);
 171     SRTSOCKET ready[1];
 172     SRTSOCKET error[1];
 173
 174     if (srt_epoll_add_usock(eid, fd, &modes) < 0)
 175         return libsrt_neterrno(h);
 176     if (write) {
 177         ret = srt_epoll_wait(eid, error, &errlen, ready, &len, POLLING_TIME, 0, 0, 0, 0);
 178     } else {
 179         ret = srt_epoll_wait(eid, ready, &len, error, &errlen, POLLING_TIME, 0, 0, 0, 0);
 180     }
 181     if (ret < 0) {
 182         if (srt_getlasterror(NULL) == SRT_ETIMEOUT)
 183             ret = AVERROR(EAGAIN);
 184         else
 185             ret = libsrt_neterrno(h);
 186     } else {
 187         ret = errlen ? AVERROR(EIO) : 0;
 188     }
 189     if (srt_epoll_remove_usock(eid, fd) < 0)
 190         return libsrt_neterrno(h);
 191     return ret;
 192 }
 193
 194 /* TODO de-duplicate code from ff_network_wait_fd_timeout() */
 195
 196 static int libsrt_network_wait_fd_timeout(URLContext *h, int eid, int fd, int write, int64_t timeout, AVIOInterruptCB *int_cb)
 197 {
 198     int ret;
 199     int64_t wait_start = 0;
 200
 201     while (1) {
 202         if (ff_check_interrupt(int_cb))
 203             return AVERROR_EXIT;
 204         ret = libsrt_network_wait_fd(h, eid, fd, write);
 205         if (ret != AVERROR(EAGAIN))
 206             return ret;
 207         if (timeout > 0) {
 208             if (!wait_start)
 209                 wait_start = av_gettime_relative();
 210             else if (av_gettime_relative() - wait_start > timeout)
 211                 return AVERROR(ETIMEDOUT);
 212         }
 213     }
 214 }
 215
 216 static int libsrt_listen(int eid, int fd, const struct sockaddr *addr, socklen_t addrlen, URLContext *h, int64_t timeout)
 217 {
 218     int ret;
 219     int reuse = 1;
 220     if (srt_setsockopt(fd, SOL_SOCKET, SRTO_REUSEADDR, &reuse, sizeof(reuse))) {
 221         av_log(h, AV_LOG_WARNING, "setsockopt(SRTO_REUSEADDR) failed\n");
 222     }
 223     ret = srt_bind(fd, addr, addrlen);
 224     if (ret)
 225         return libsrt_neterrno(h);
 226
 227     ret = srt_listen(fd, 1);
 228     if (ret)
 229         return libsrt_neterrno(h);
 230
 231     ret = libsrt_network_wait_fd_timeout(h, eid, fd, 1, timeout, &h->interrupt_callback);
 232     if (ret < 0)
 233         return ret;
 234
 235     ret = srt_accept(fd, NULL, NULL);
 236     if (ret < 0)
 237         return libsrt_neterrno(h);
 238     if (libsrt_socket_nonblock(ret, 1) < 0)
 239         av_log(h, AV_LOG_DEBUG, "libsrt_socket_nonblock failed\n");
 240
 241     return ret;
 242 }
 243
 244 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)
 245 {
 246     int ret;
 247
 248     ret = srt_connect(fd, addr, addrlen);
 249     if (ret < 0)
 250         return libsrt_neterrno(h);
 251
 252     ret = libsrt_network_wait_fd_timeout(h, eid, fd, 1, timeout, &h->interrupt_callback);
 253     if (ret < 0) {
 254         if (will_try_next) {
 255             av_log(h, AV_LOG_WARNING,
 256                    "Connection to %s failed (%s), trying next address\n",
 257                    h->filename, av_err2str(ret));
 258         } else {
 259             av_log(h, AV_LOG_ERROR, "Connection to %s failed: %s\n",
 260                    h->filename, av_err2str(ret));
 261         }
 262     }
 263     return ret;
 264 }
 265
 266 static int libsrt_setsockopt(URLContext *h, int fd, SRT_SOCKOPT optname, const char * optnamestr, const void * optval, int optlen)
 267 {
 268     if (srt_setsockopt(fd, 0, optname, optval, optlen) < 0) {
 269         av_log(h, AV_LOG_ERROR, "failed to set option %s on socket: %s\n", optnamestr, srt_getlasterror_str());
 270         return AVERROR(EIO);
 271     }
 272     return 0;
 273 }
 274
 275 static int libsrt_getsockopt(URLContext *h, int fd, SRT_SOCKOPT optname, const char * optnamestr, void * optval, int * optlen)
 276 {
 277     if (srt_getsockopt(fd, 0, optname, optval, optlen) < 0) {
 278         av_log(h, AV_LOG_ERROR, "failed to get option %s on socket: %s\n", optnamestr, srt_getlasterror_str());
 279         return AVERROR(EIO);
 280     }
 281     return 0;
 282 }
 283
 284 /* - The "POST" options can be altered any time on a connected socket.
 285      They MAY have also some meaning when set prior to connecting; such
 286      option is SRTO_RCVSYN, which makes connect/accept call asynchronous.
 287      Because of that this option is treated special way in this app. */
 288 static int libsrt_set_options_post(URLContext *h, int fd)
 289 {
 290     SRTContext *s = h->priv_data;
 291
 292     if ((s->inputbw >= 0 && libsrt_setsockopt(h, fd, SRTO_INPUTBW, "SRTO_INPUTBW", &s->inputbw, sizeof(s->inputbw)) < 0) ||
 293         (s->oheadbw >= 0 && libsrt_setsockopt(h, fd, SRTO_OHEADBW, "SRTO_OHEADBW", &s->oheadbw, sizeof(s->oheadbw)) < 0)) {
 294         return AVERROR(EIO);
 295     }
 296     return 0;
 297 }
 298
 299 /* - The "PRE" options must be set prior to connecting and can't be altered
 300      on a connected socket, however if set on a listening socket, they are
 301      derived by accept-ed socket. */
 302 static int libsrt_set_options_pre(URLContext *h, int fd)
 303 {
 304     SRTContext *s = h->priv_data;
 305     int yes = 1;
 306     int latency = s->latency / 1000;
 307     int rcvlatency = s->rcvlatency / 1000;
 308     int peerlatency = s->peerlatency / 1000;
 309     int connect_timeout = s->connect_timeout;
 310
 311     if ((s->mode == SRT_MODE_RENDEZVOUS && libsrt_setsockopt(h, fd, SRTO_RENDEZVOUS, "SRTO_RENDEZVOUS", &yes, sizeof(yes)) < 0) ||
 312         (s->transtype != SRTT_INVALID && libsrt_setsockopt(h, fd, SRTO_TRANSTYPE, "SRTO_TRANSTYPE", &s->transtype, sizeof(s->transtype)) < 0) ||
 313         (s->maxbw >= 0 && libsrt_setsockopt(h, fd, SRTO_MAXBW, "SRTO_MAXBW", &s->maxbw, sizeof(s->maxbw)) < 0) ||
 314         (s->pbkeylen >= 0 && libsrt_setsockopt(h, fd, SRTO_PBKEYLEN, "SRTO_PBKEYLEN", &s->pbkeylen, sizeof(s->pbkeylen)) < 0) ||
 315         (s->passphrase && libsrt_setsockopt(h, fd, SRTO_PASSPHRASE, "SRTO_PASSPHRASE", s->passphrase, strlen(s->passphrase)) < 0) ||
 316 #if SRT_VERSION_VALUE >= 0x010302
 317 #if SRT_VERSION_VALUE >= 0x010401
 318         (s->enforced_encryption >= 0 && libsrt_setsockopt(h, fd, SRTO_ENFORCEDENCRYPTION, "SRTO_ENFORCEDENCRYPTION", &s->enforced_encryption, sizeof(s->enforced_encryption)) < 0) ||
 319 #else
 320         /* SRTO_STRICTENC == SRTO_ENFORCEDENCRYPTION (53), but for compatibility, we used SRTO_STRICTENC */
 321         (s->enforced_encryption >= 0 && libsrt_setsockopt(h, fd, SRTO_STRICTENC, "SRTO_STRICTENC", &s->enforced_encryption, sizeof(s->enforced_encryption)) < 0) ||
 322 #endif
 323         (s->kmrefreshrate >= 0 && libsrt_setsockopt(h, fd, SRTO_KMREFRESHRATE, "SRTO_KMREFRESHRATE", &s->kmrefreshrate, sizeof(s->kmrefreshrate)) < 0) ||
 324         (s->kmpreannounce >= 0 && libsrt_setsockopt(h, fd, SRTO_KMPREANNOUNCE, "SRTO_KMPREANNOUNCE", &s->kmpreannounce, sizeof(s->kmpreannounce)) < 0) ||
 325 #endif
 326         (s->mss >= 0 && libsrt_setsockopt(h, fd, SRTO_MSS, "SRTO_MSS", &s->mss, sizeof(s->mss)) < 0) ||
 327         (s->ffs >= 0 && libsrt_setsockopt(h, fd, SRTO_FC, "SRTO_FC", &s->ffs, sizeof(s->ffs)) < 0) ||
 328         (s->ipttl >= 0 && libsrt_setsockopt(h, fd, SRTO_IPTTL, "SRTO_IPTTL", &s->ipttl, sizeof(s->ipttl)) < 0) ||
 329         (s->iptos >= 0 && libsrt_setsockopt(h, fd, SRTO_IPTOS, "SRTO_IPTOS", &s->iptos, sizeof(s->iptos)) < 0) ||
 330         (s->latency >= 0 && libsrt_setsockopt(h, fd, SRTO_LATENCY, "SRTO_LATENCY", &latency, sizeof(latency)) < 0) ||
 331         (s->rcvlatency >= 0 && libsrt_setsockopt(h, fd, SRTO_RCVLATENCY, "SRTO_RCVLATENCY", &rcvlatency, sizeof(rcvlatency)) < 0) ||
 332         (s->peerlatency >= 0 && libsrt_setsockopt(h, fd, SRTO_PEERLATENCY, "SRTO_PEERLATENCY", &peerlatency, sizeof(peerlatency)) < 0) ||
 333         (s->tlpktdrop >= 0 && libsrt_setsockopt(h, fd, SRTO_TLPKTDROP, "SRTO_TLPKDROP", &s->tlpktdrop, sizeof(s->tlpktdrop)) < 0) ||
 334         (s->nakreport >= 0 && libsrt_setsockopt(h, fd, SRTO_NAKREPORT, "SRTO_NAKREPORT", &s->nakreport, sizeof(s->nakreport)) < 0) ||
 335         (connect_timeout >= 0 && libsrt_setsockopt(h, fd, SRTO_CONNTIMEO, "SRTO_CONNTIMEO", &connect_timeout, sizeof(connect_timeout)) <0 ) ||
 336         (s->sndbuf >= 0 && libsrt_setsockopt(h, fd, SRTO_SNDBUF, "SRTO_SNDBUF", &s->sndbuf, sizeof(s->sndbuf)) < 0) ||
 337         (s->rcvbuf >= 0 && libsrt_setsockopt(h, fd, SRTO_RCVBUF, "SRTO_RCVBUF", &s->rcvbuf, sizeof(s->rcvbuf)) < 0) ||
 338         (s->lossmaxttl >= 0 && libsrt_setsockopt(h, fd, SRTO_LOSSMAXTTL, "SRTO_LOSSMAXTTL", &s->lossmaxttl, sizeof(s->lossmaxttl)) < 0) ||
 339         (s->minversion >= 0 && libsrt_setsockopt(h, fd, SRTO_MINVERSION, "SRTO_MINVERSION", &s->minversion, sizeof(s->minversion)) < 0) ||
 340         (s->streamid && libsrt_setsockopt(h, fd, SRTO_STREAMID, "SRTO_STREAMID", s->streamid, strlen(s->streamid)) < 0) ||
 341 #if SRT_VERSION_VALUE >= 0x010401
 342         (s->smoother && libsrt_setsockopt(h, fd, SRTO_CONGESTION, "SRTO_CONGESTION", s->smoother, strlen(s->smoother)) < 0) ||
 343 #else
 344         (s->smoother && libsrt_setsockopt(h, fd, SRTO_SMOOTHER, "SRTO_SMOOTHER", s->smoother, strlen(s->smoother)) < 0) ||
 345 #endif
 346         (s->messageapi >= 0 && libsrt_setsockopt(h, fd, SRTO_MESSAGEAPI, "SRTO_MESSAGEAPI", &s->messageapi, sizeof(s->messageapi)) < 0) ||
 347         (s->payload_size >= 0 && libsrt_setsockopt(h, fd, SRTO_PAYLOADSIZE, "SRTO_PAYLOADSIZE", &s->payload_size, sizeof(s->payload_size)) < 0) ||
 348         ((h->flags & AVIO_FLAG_WRITE) && libsrt_setsockopt(h, fd, SRTO_SENDER, "SRTO_SENDER", &yes, sizeof(yes)) < 0)) {
 349         return AVERROR(EIO);
 350     }
 351
 352     if (s->linger >= 0) {
 353         struct linger lin;
 354         lin.l_linger = s->linger;
 355         lin.l_onoff  = lin.l_linger > 0 ? 1 : 0;
 356         if (libsrt_setsockopt(h, fd, SRTO_LINGER, "SRTO_LINGER", &lin, sizeof(lin)) < 0)
 357             return AVERROR(EIO);
 358     }
 359     return 0;
 360 }
 361
 362
 363 static int libsrt_setup(URLContext *h, const char *uri, int flags)
 364 {
 365     struct addrinfo hints = { 0 }, *ai, *cur_ai;
 366     int port, fd = -1, listen_fd = -1;
 367     SRTContext *s = h->priv_data;
 368     const char *p;
 369     char buf[256];
 370     int ret;
 371     char hostname[1024],proto[1024],path[1024];
 372     char portstr[10];
 373     int64_t open_timeout = 0;
 374     int eid;
 375
 376     av_url_split(proto, sizeof(proto), NULL, 0, hostname, sizeof(hostname),
 377         &port, path, sizeof(path), uri);
 378     if (strcmp(proto, "srt"))
 379         return AVERROR(EINVAL);
 380     if (port <= 0 || port >= 65536) {
 381         av_log(h, AV_LOG_ERROR, "Port missing in uri\n");
 382         return AVERROR(EINVAL);
 383     }
 384     p = strchr(uri, '?');
 385     if (p) {
 386         if (av_find_info_tag(buf, sizeof(buf), "timeout", p)) {
 387             s->rw_timeout = strtol(buf, NULL, 10);
 388         }
 389         if (av_find_info_tag(buf, sizeof(buf), "listen_timeout", p)) {
 390             s->listen_timeout = strtol(buf, NULL, 10);
 391         }
 392     }
 393     if (s->rw_timeout >= 0) {
 394         open_timeout = h->rw_timeout = s->rw_timeout;
 395     }
 396     hints.ai_family = AF_UNSPEC;
 397     hints.ai_socktype = SOCK_DGRAM;
 398     snprintf(portstr, sizeof(portstr), "%d", port);
 399     if (s->mode == SRT_MODE_LISTENER)
 400         hints.ai_flags |= AI_PASSIVE;
 401     ret = getaddrinfo(hostname[0] ? hostname : NULL, portstr, &hints, &ai);
 402     if (ret) {
 403         av_log(h, AV_LOG_ERROR,
 404                "Failed to resolve hostname %s: %s\n",
 405                hostname, gai_strerror(ret));
 406         return AVERROR(EIO);
 407     }
 408
 409     cur_ai = ai;
 410
 411     eid = srt_epoll_create();
 412     if (eid < 0)
 413         return libsrt_neterrno(h);
 414     s->eid = eid;
 415
 416  restart:
 417
 418     fd = srt_socket(cur_ai->ai_family, cur_ai->ai_socktype, 0);
 419     if (fd < 0) {
 420         ret = libsrt_neterrno(h);
 421         goto fail;
 422     }
 423
 424     if ((ret = libsrt_set_options_pre(h, fd)) < 0) {
 425         goto fail;
 426     }
 427
 428     /* Set the socket's send or receive buffer sizes, if specified.
 429        If unspecified or setting fails, system default is used. */
 430     if (s->recv_buffer_size > 0) {
 431         srt_setsockopt(fd, SOL_SOCKET, SRTO_UDP_RCVBUF, &s->recv_buffer_size, sizeof (s->recv_buffer_size));
 432     }
 433     if (s->send_buffer_size > 0) {
 434         srt_setsockopt(fd, SOL_SOCKET, SRTO_UDP_SNDBUF, &s->send_buffer_size, sizeof (s->send_buffer_size));
 435     }
 436     if (libsrt_socket_nonblock(fd, 1) < 0)
 437         av_log(h, AV_LOG_DEBUG, "libsrt_socket_nonblock failed\n");
 438
 439     if (s->mode == SRT_MODE_LISTENER) {
 440         // multi-client
 441         if ((ret = libsrt_listen(s->eid, fd, cur_ai->ai_addr, cur_ai->ai_addrlen, h, s->listen_timeout)) < 0)
 442             goto fail1;
 443         listen_fd = fd;
 444         fd = ret;
 445     } else {
 446         if (s->mode == SRT_MODE_RENDEZVOUS) {
 447             ret = srt_bind(fd, cur_ai->ai_addr, cur_ai->ai_addrlen);
 448             if (ret)
 449                 goto fail1;
 450         }
 451
 452         if ((ret = libsrt_listen_connect(s->eid, fd, cur_ai->ai_addr, cur_ai->ai_addrlen,
 453                                           open_timeout, h, !!cur_ai->ai_next)) < 0) {
 454             if (ret == AVERROR_EXIT)
 455                 goto fail1;
 456             else
 457                 goto fail;
 458         }
 459     }
 460     if ((ret = libsrt_set_options_post(h, fd)) < 0) {
 461         goto fail;
 462     }
 463
 464     if (flags & AVIO_FLAG_WRITE) {
 465         int packet_size = 0;
 466         int optlen = sizeof(packet_size);
 467         ret = libsrt_getsockopt(h, fd, SRTO_PAYLOADSIZE, "SRTO_PAYLOADSIZE", &packet_size, &optlen);
 468         if (ret < 0)
 469             goto fail1;
 470         if (packet_size > 0)
 471             h->max_packet_size = packet_size;
 472     }
 473
 474     h->is_streamed = 1;
 475     s->fd = fd;
 476     s->listen_fd = listen_fd;
 477
 478     freeaddrinfo(ai);
 479     return 0;
 480
 481  fail:
 482     if (cur_ai->ai_next) {
 483         /* Retry with the next sockaddr */
 484         cur_ai = cur_ai->ai_next;
 485         if (fd >= 0)
 486             srt_close(fd);
 487         if (listen_fd >= 0)
 488             srt_close(listen_fd);
 489         ret = 0;
 490         goto restart;
 491     }
 492  fail1:
 493     if (fd >= 0)
 494         srt_close(fd);
 495     if (listen_fd >= 0)
 496         srt_close(listen_fd);
 497     freeaddrinfo(ai);
 498     srt_epoll_release(s->eid);
 499     return ret;
 500 }
 501
 502 static int libsrt_open(URLContext *h, const char *uri, int flags)
 503 {
 504     SRTContext *s = h->priv_data;
 505     const char * p;
 506     char buf[256];
 507     int ret = 0;
 508
 509     if (srt_startup() < 0) {
 510         return AVERROR_UNKNOWN;
 511     }
 512
 513     /* SRT options (srt/srt.h) */
 514     p = strchr(uri, '?');
 515     if (p) {
 516         if (av_find_info_tag(buf, sizeof(buf), "maxbw", p)) {
 517             s->maxbw = strtoll(buf, NULL, 0);
 518         }
 519         if (av_find_info_tag(buf, sizeof(buf), "pbkeylen", p)) {
 520             s->pbkeylen = strtol(buf, NULL, 10);
 521         }
 522         if (av_find_info_tag(buf, sizeof(buf), "passphrase", p)) {
 523             av_freep(&s->passphrase);
 524             s->passphrase = av_strndup(buf, strlen(buf));
 525         }
 526 #if SRT_VERSION_VALUE >= 0x010302
 527         if (av_find_info_tag(buf, sizeof(buf), "enforced_encryption", p)) {
 528             s->enforced_encryption = strtol(buf, NULL, 10);
 529         }
 530         if (av_find_info_tag(buf, sizeof(buf), "kmrefreshrate", p)) {
 531             s->kmrefreshrate = strtol(buf, NULL, 10);
 532         }
 533         if (av_find_info_tag(buf, sizeof(buf), "kmpreannounce", p)) {
 534             s->kmpreannounce = strtol(buf, NULL, 10);
 535         }
 536 #endif
 537         if (av_find_info_tag(buf, sizeof(buf), "mss", p)) {
 538             s->mss = strtol(buf, NULL, 10);
 539         }
 540         if (av_find_info_tag(buf, sizeof(buf), "ffs", p)) {
 541             s->ffs = strtol(buf, NULL, 10);
 542         }
 543         if (av_find_info_tag(buf, sizeof(buf), "ipttl", p)) {
 544             s->ipttl = strtol(buf, NULL, 10);
 545         }
 546         if (av_find_info_tag(buf, sizeof(buf), "iptos", p)) {
 547             s->iptos = strtol(buf, NULL, 10);
 548         }
 549         if (av_find_info_tag(buf, sizeof(buf), "inputbw", p)) {
 550             s->inputbw = strtoll(buf, NULL, 10);
 551         }
 552         if (av_find_info_tag(buf, sizeof(buf), "oheadbw", p)) {
 553             s->oheadbw = strtoll(buf, NULL, 10);
 554         }
 555         if (av_find_info_tag(buf, sizeof(buf), "latency", p)) {
 556             s->latency = strtol(buf, NULL, 10);
 557         }
 558         if (av_find_info_tag(buf, sizeof(buf), "tsbpddelay", p)) {
 559             s->latency = strtol(buf, NULL, 10);
 560         }
 561         if (av_find_info_tag(buf, sizeof(buf), "rcvlatency", p)) {
 562             s->rcvlatency = strtol(buf, NULL, 10);
 563         }
 564         if (av_find_info_tag(buf, sizeof(buf), "peerlatency", p)) {
 565             s->peerlatency = strtol(buf, NULL, 10);
 566         }
 567         if (av_find_info_tag(buf, sizeof(buf), "tlpktdrop", p)) {
 568             s->tlpktdrop = strtol(buf, NULL, 10);
 569         }
 570         if (av_find_info_tag(buf, sizeof(buf), "nakreport", p)) {
 571             s->nakreport = strtol(buf, NULL, 10);
 572         }
 573         if (av_find_info_tag(buf, sizeof(buf), "connect_timeout", p)) {
 574             s->connect_timeout = strtol(buf, NULL, 10);
 575         }
 576         if (av_find_info_tag(buf, sizeof(buf), "payload_size", p) ||
 577             av_find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
 578             s->payload_size = strtol(buf, NULL, 10);
 579         }
 580         if (av_find_info_tag(buf, sizeof(buf), "mode", p)) {
 581             if (!strcmp(buf, "caller")) {
 582                 s->mode = SRT_MODE_CALLER;
 583             } else if (!strcmp(buf, "listener")) {
 584                 s->mode = SRT_MODE_LISTENER;
 585             } else if (!strcmp(buf, "rendezvous")) {
 586                 s->mode = SRT_MODE_RENDEZVOUS;
 587             } else {
 588                 ret = AVERROR(EINVAL);
 589                 goto err;
 590             }
 591         }
 592         if (av_find_info_tag(buf, sizeof(buf), "sndbuf", p)) {
 593             s->sndbuf = strtol(buf, NULL, 10);
 594         }
 595         if (av_find_info_tag(buf, sizeof(buf), "rcvbuf", p)) {
 596             s->rcvbuf = strtol(buf, NULL, 10);
 597         }
 598         if (av_find_info_tag(buf, sizeof(buf), "lossmaxttl", p)) {
 599             s->lossmaxttl = strtol(buf, NULL, 10);
 600         }
 601         if (av_find_info_tag(buf, sizeof(buf), "minversion", p)) {
 602             s->minversion = strtol(buf, NULL, 0);
 603         }
 604         if (av_find_info_tag(buf, sizeof(buf), "streamid", p)) {
 605             av_freep(&s->streamid);
 606             s->streamid = av_strdup(buf);
 607             if (!s->streamid) {
 608                 ret = AVERROR(ENOMEM);
 609                 goto err;
 610             }
 611         }
 612         if (av_find_info_tag(buf, sizeof(buf), "smoother", p)) {
 613             av_freep(&s->smoother);
 614             s->smoother = av_strdup(buf);
 615             if(!s->smoother) {
 616                 ret = AVERROR(ENOMEM);
 617                 goto err;
 618             }
 619         }
 620         if (av_find_info_tag(buf, sizeof(buf), "messageapi", p)) {
 621             s->messageapi = strtol(buf, NULL, 10);
 622         }
 623         if (av_find_info_tag(buf, sizeof(buf), "transtype", p)) {
 624             if (!strcmp(buf, "live")) {
 625                 s->transtype = SRTT_LIVE;
 626             } else if (!strcmp(buf, "file")) {
 627                 s->transtype = SRTT_FILE;
 628             } else {
 629                 ret = AVERROR(EINVAL);
 630                 goto err;
 631             }
 632         }
 633         if (av_find_info_tag(buf, sizeof(buf), "linger", p)) {
 634             s->linger = strtol(buf, NULL, 10);
 635         }
 636     }
 637     ret = libsrt_setup(h, uri, flags);
 638     if (ret < 0)
 639         goto err;
 640     return 0;
 641
 642 err:
 643     av_freep(&s->smoother);
 644     av_freep(&s->streamid);
 645     srt_cleanup();
 646     return ret;
 647 }
 648
 649 static int libsrt_read(URLContext *h, uint8_t *buf, int size)
 650 {
 651     SRTContext *s = h->priv_data;
 652     int ret;
 653
 654     if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
 655         ret = libsrt_network_wait_fd_timeout(h, s->eid, s->fd, 0, h->rw_timeout, &h->interrupt_callback);
 656         if (ret)
 657             return ret;
 658     }
 659
 660     ret = srt_recvmsg(s->fd, buf, size);
 661     if (ret < 0) {
 662         ret = libsrt_neterrno(h);
 663     }
 664
 665     return ret;
 666 }
 667
 668 static int libsrt_write(URLContext *h, const uint8_t *buf, int size)
 669 {
 670     SRTContext *s = h->priv_data;
 671     int ret;
 672
 673     if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
 674         ret = libsrt_network_wait_fd_timeout(h, s->eid, s->fd, 1, h->rw_timeout, &h->interrupt_callback);
 675         if (ret)
 676             return ret;
 677     }
 678
 679     ret = srt_sendmsg(s->fd, buf, size, -1, 0);
 680     if (ret < 0) {
 681         ret = libsrt_neterrno(h);
 682     }
 683
 684     return ret;
 685 }
 686
 687 static int libsrt_close(URLContext *h)
 688 {
 689     SRTContext *s = h->priv_data;
 690
 691     srt_close(s->fd);
 692
 693     if (s->listen_fd >= 0)
 694         srt_close(s->listen_fd);
 695
 696     srt_epoll_release(s->eid);
 697
 698     srt_cleanup();
 699
 700     return 0;
 701 }
 702
 703 static int libsrt_get_file_handle(URLContext *h)
 704 {
 705     SRTContext *s = h->priv_data;
 706     return s->fd;
 707 }
 708
 709 static const AVClass libsrt_class = {
 710     .class_name = "libsrt",
 711     .item_name  = av_default_item_name,
 712     .option     = libsrt_options,
 713     .version    = LIBAVUTIL_VERSION_INT,
 714 };
 715
 716 const URLProtocol ff_libsrt_protocol = {
 717     .name                = "srt",
 718     .url_open            = libsrt_open,
 719     .url_read            = libsrt_read,
 720     .url_write           = libsrt_write,
 721     .url_close           = libsrt_close,
 722     .url_get_file_handle = libsrt_get_file_handle,
 723     .priv_data_size      = sizeof(SRTContext),
 724     .flags               = URL_PROTOCOL_FLAG_NETWORK,
 725     .priv_data_class     = &libsrt_class,
 726 };