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/opt.h"
  27 #include "libavutil/parseutils.h"
  28 #include "libavutil/time.h"
  29
  30 #include "avformat.h"
  31 #include "internal.h"
  32 #include "network.h"
  33 #include "os_support.h"
  34 #include "url.h"
  35
  36 /* This is for MPEG-TS and it's a default SRTO_PAYLOADSIZE for SRTT_LIVE (8 TS packets) */
  37 #ifndef SRT_LIVE_DEFAULT_PAYLOAD_SIZE
  38 #define SRT_LIVE_DEFAULT_PAYLOAD_SIZE 1316
  39 #endif
  40
  41 /* This is the maximum payload size for Live mode, should you have a different payload type than MPEG-TS */
  42 #ifndef SRT_LIVE_MAX_PAYLOAD_SIZE
  43 #define SRT_LIVE_MAX_PAYLOAD_SIZE 1456
  44 #endif
  45
  46 enum SRTMode {
  47     SRT_MODE_CALLER = 0,
  48     SRT_MODE_LISTENER = 1,
  49     SRT_MODE_RENDEZVOUS = 2
  50 };
  51
  52 typedef struct SRTContext {
  53     const AVClass *class;
  54     int fd;
  55     int eid;
  56     int64_t rw_timeout;
  57     int64_t listen_timeout;
  58     int recv_buffer_size;
  59     int send_buffer_size;
  60
  61     int64_t maxbw;
  62     int pbkeylen;
  63     char *passphrase;
  64 #if SRT_VERSION_VALUE >= 0x010302
  65     int enforced_encryption;
  66     int kmrefreshrate;
  67     int kmpreannounce;
  68     int64_t snddropdelay;
  69 #endif
  70     int mss;
  71     int ffs;
  72     int ipttl;
  73     int iptos;
  74     int64_t inputbw;
  75     int oheadbw;
  76     int64_t latency;
  77     int tlpktdrop;
  78     int nakreport;
  79     int64_t connect_timeout;
  80     int payload_size;
  81     int64_t rcvlatency;
  82     int64_t peerlatency;
  83     enum SRTMode mode;
  84     int sndbuf;
  85     int rcvbuf;
  86     int lossmaxttl;
  87     int minversion;
  88     char *streamid;
  89     char *smoother;
  90     int messageapi;
  91     SRT_TRANSTYPE transtype;
  92     int linger;
  93     int tsbpd;
  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     { "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 },
 116 #endif
 117     { "mss",            "The Maximum Segment Size",                                             OFFSET(mss),              AV_OPT_TYPE_INT,      { .i64 = -1 }, -1, 1500,      .flags = D|E },
 118     { "ffs",            "Flight flag size (window size) (in bytes)",                            OFFSET(ffs),              AV_OPT_TYPE_INT,      { .i64 = -1 }, -1, INT_MAX,   .flags = D|E },
 119     { "ipttl",          "IP Time To Live",                                                      OFFSET(ipttl),            AV_OPT_TYPE_INT,      { .i64 = -1 }, -1, 255,       .flags = D|E },
 120     { "iptos",          "IP Type of Service",                                                   OFFSET(iptos),            AV_OPT_TYPE_INT,      { .i64 = -1 }, -1, 255,       .flags = D|E },
 121     { "inputbw",        "Estimated input stream rate",                                          OFFSET(inputbw),          AV_OPT_TYPE_INT64,    { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
 122     { "oheadbw",        "MaxBW ceiling based on % over input stream rate",                      OFFSET(oheadbw),          AV_OPT_TYPE_INT,      { .i64 = -1 }, -1, 100,       .flags = D|E },
 123     { "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 },
 124     { "tsbpddelay",     "deprecated, same effect as latency option",                            OFFSET(latency),          AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
 125     { "rcvlatency",     "receive latency (in microseconds)",                                    OFFSET(rcvlatency),       AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
 126     { "peerlatency",    "peer latency (in microseconds)",                                       OFFSET(peerlatency),      AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
 127     { "tlpktdrop",      "Enable too-late pkt drop",                                             OFFSET(tlpktdrop),        AV_OPT_TYPE_BOOL,     { .i64 = -1 }, -1, 1,         .flags = D|E },
 128     { "nakreport",      "Enable receiver to send periodic NAK reports",                         OFFSET(nakreport),        AV_OPT_TYPE_BOOL,     { .i64 = -1 }, -1, 1,         .flags = D|E },
 129     { "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 },
 130     { "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" },
 131     { "caller",         NULL, 0, AV_OPT_TYPE_CONST,  { .i64 = SRT_MODE_CALLER },     INT_MIN, INT_MAX, .flags = D|E, "mode" },
 132     { "listener",       NULL, 0, AV_OPT_TYPE_CONST,  { .i64 = SRT_MODE_LISTENER },   INT_MIN, INT_MAX, .flags = D|E, "mode" },
 133     { "rendezvous",     NULL, 0, AV_OPT_TYPE_CONST,  { .i64 = SRT_MODE_RENDEZVOUS }, INT_MIN, INT_MAX, .flags = D|E, "mode" },
 134     { "sndbuf",         "Send buffer size (in bytes)",                                          OFFSET(sndbuf),           AV_OPT_TYPE_INT,      { .i64 = -1 }, -1, INT_MAX,   .flags = D|E },
 135     { "rcvbuf",         "Receive buffer size (in bytes)",                                       OFFSET(rcvbuf),           AV_OPT_TYPE_INT,      { .i64 = -1 }, -1, INT_MAX,   .flags = D|E },
 136     { "lossmaxttl",     "Maximum possible packet reorder tolerance",                            OFFSET(lossmaxttl),       AV_OPT_TYPE_INT,      { .i64 = -1 }, -1, INT_MAX,   .flags = D|E },
 137     { "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 },
 138     { "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 },
 139     { "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 },
 140     { "smoother",       "The type of Smoother used for the transmission for that socket",       OFFSET(smoother),         AV_OPT_TYPE_STRING,   { .str = NULL },              .flags = D|E },
 141     { "messageapi",     "Enable message API",                                                   OFFSET(messageapi),       AV_OPT_TYPE_BOOL,     { .i64 = -1 }, -1, 1,         .flags = D|E },
 142     { "transtype",      "The transmission type for the socket",                                 OFFSET(transtype),        AV_OPT_TYPE_INT,      { .i64 = SRTT_INVALID }, SRTT_LIVE, SRTT_INVALID, .flags = D|E, "transtype" },
 143     { "live",           NULL, 0, AV_OPT_TYPE_CONST,  { .i64 = SRTT_LIVE }, INT_MIN, INT_MAX, .flags = D|E, "transtype" },
 144     { "file",           NULL, 0, AV_OPT_TYPE_CONST,  { .i64 = SRTT_FILE }, INT_MIN, INT_MAX, .flags = D|E, "transtype" },
 145     { "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 },
 146     { "tsbpd",          "Timestamp-based packet delivery",                                      OFFSET(tsbpd),            AV_OPT_TYPE_BOOL,     { .i64 = -1 }, -1, 1,         .flags = D|E },
 147     { NULL }
 148 };
 149
 150 static int libsrt_neterrno(URLContext *h)
 151 {
 152     int os_errno;
 153     int err = srt_getlasterror(&os_errno);
 154     if (err == SRT_EASYNCRCV || err == SRT_EASYNCSND)
 155         return AVERROR(EAGAIN);
 156     av_log(h, AV_LOG_ERROR, "%s\n", srt_getlasterror_str());
 157     return os_errno ? AVERROR(os_errno) : AVERROR_UNKNOWN;
 158 }
 159
 160 static int libsrt_getsockopt(URLContext *h, int fd, SRT_SOCKOPT optname, const char * optnamestr, void * optval, int * optlen)
 161 {
 162     if (srt_getsockopt(fd, 0, optname, optval, optlen) < 0) {
 163         av_log(h, AV_LOG_ERROR, "failed to get option %s on socket: %s\n", optnamestr, srt_getlasterror_str());
 164         return AVERROR(EIO);
 165     }
 166     return 0;
 167 }
 168
 169 static int libsrt_socket_nonblock(int socket, int enable)
 170 {
 171     int ret, blocking = enable ? 0 : 1;
 172     /* Setting SRTO_{SND,RCV}SYN options to 1 enable blocking mode, setting them to 0 enable non-blocking mode. */
 173     ret = srt_setsockopt(socket, 0, SRTO_SNDSYN, &blocking, sizeof(blocking));
 174     if (ret < 0)
 175         return ret;
 176     return srt_setsockopt(socket, 0, SRTO_RCVSYN, &blocking, sizeof(blocking));
 177 }
 178
 179 static int libsrt_epoll_create(URLContext *h, int fd, int write)
 180 {
 181     int modes = SRT_EPOLL_ERR | (write ? SRT_EPOLL_OUT : SRT_EPOLL_IN);
 182     int eid = srt_epoll_create();
 183     if (eid < 0)
 184         return libsrt_neterrno(h);
 185     if (srt_epoll_add_usock(eid, fd, &modes) < 0) {
 186         srt_epoll_release(eid);
 187         return libsrt_neterrno(h);
 188     }
 189     return eid;
 190 }
 191
 192 static int libsrt_network_wait_fd(URLContext *h, int eid, int write)
 193 {
 194     int ret, len = 1, errlen = 1;
 195     SRTSOCKET ready[1];
 196     SRTSOCKET error[1];
 197
 198     if (write) {
 199         ret = srt_epoll_wait(eid, error, &errlen, ready, &len, POLLING_TIME, 0, 0, 0, 0);
 200     } else {
 201         ret = srt_epoll_wait(eid, ready, &len, error, &errlen, POLLING_TIME, 0, 0, 0, 0);
 202     }
 203     if (ret < 0) {
 204         if (srt_getlasterror(NULL) == SRT_ETIMEOUT)
 205             ret = AVERROR(EAGAIN);
 206         else
 207             ret = libsrt_neterrno(h);
 208     } else {
 209         ret = errlen ? AVERROR(EIO) : 0;
 210     }
 211     return ret;
 212 }
 213
 214 /* TODO de-duplicate code from ff_network_wait_fd_timeout() */
 215
 216 static int libsrt_network_wait_fd_timeout(URLContext *h, int eid, int write, int64_t timeout, AVIOInterruptCB *int_cb)
 217 {
 218     int ret;
 219     int64_t wait_start = 0;
 220
 221     while (1) {
 222         if (ff_check_interrupt(int_cb))
 223             return AVERROR_EXIT;
 224         ret = libsrt_network_wait_fd(h, eid, write);
 225         if (ret != AVERROR(EAGAIN))
 226             return ret;
 227         if (timeout > 0) {
 228             if (!wait_start)
 229                 wait_start = av_gettime_relative();
 230             else if (av_gettime_relative() - wait_start > timeout)
 231                 return AVERROR(ETIMEDOUT);
 232         }
 233     }
 234 }
 235
 236 static int libsrt_listen(int eid, int fd, const struct sockaddr *addr, socklen_t addrlen, URLContext *h, int64_t timeout)
 237 {
 238     int ret;
 239     int reuse = 1;
 240     /* Max streamid length plus an extra space for the terminating null character */
 241     char streamid[513];
 242     int streamid_len = sizeof(streamid);
 243     if (srt_setsockopt(fd, SOL_SOCKET, SRTO_REUSEADDR, &reuse, sizeof(reuse))) {
 244         av_log(h, AV_LOG_WARNING, "setsockopt(SRTO_REUSEADDR) failed\n");
 245     }
 246     if (srt_bind(fd, addr, addrlen))
 247         return libsrt_neterrno(h);
 248
 249     if (srt_listen(fd, 1))
 250         return libsrt_neterrno(h);
 251
 252     ret = libsrt_network_wait_fd_timeout(h, eid, 0, timeout, &h->interrupt_callback);
 253     if (ret < 0)
 254         return ret;
 255
 256     ret = srt_accept(fd, NULL, NULL);
 257     if (ret < 0)
 258         return libsrt_neterrno(h);
 259     if (libsrt_socket_nonblock(ret, 1) < 0)
 260         av_log(h, AV_LOG_DEBUG, "libsrt_socket_nonblock failed\n");
 261     if (!libsrt_getsockopt(h, ret, SRTO_STREAMID, "SRTO_STREAMID", streamid, &streamid_len))
 262         /* Note: returned streamid_len doesn't count the terminating null character */
 263         av_log(h, AV_LOG_VERBOSE, "accept streamid [%s], length %d\n", streamid, streamid_len);
 264
 265     return ret;
 266 }
 267
 268 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)
 269 {
 270     int ret;
 271
 272     if (srt_connect(fd, addr, addrlen) < 0)
 273         return libsrt_neterrno(h);
 274
 275     ret = libsrt_network_wait_fd_timeout(h, eid, 1, timeout, &h->interrupt_callback);
 276     if (ret < 0) {
 277         if (will_try_next) {
 278             av_log(h, AV_LOG_WARNING,
 279                    "Connection to %s failed (%s), trying next address\n",
 280                    h->filename, av_err2str(ret));
 281         } else {
 282             av_log(h, AV_LOG_ERROR, "Connection to %s failed: %s\n",
 283                    h->filename, av_err2str(ret));
 284         }
 285     }
 286     return ret;
 287 }
 288
 289 static int libsrt_setsockopt(URLContext *h, int fd, SRT_SOCKOPT optname, const char * optnamestr, const void * optval, int optlen)
 290 {
 291     if (srt_setsockopt(fd, 0, optname, optval, optlen) < 0) {
 292         av_log(h, AV_LOG_ERROR, "failed to set option %s on socket: %s\n", optnamestr, srt_getlasterror_str());
 293         return AVERROR(EIO);
 294     }
 295     return 0;
 296 }
 297
 298 /* - The "POST" options can be altered any time on a connected socket.
 299      They MAY have also some meaning when set prior to connecting; such
 300      option is SRTO_RCVSYN, which makes connect/accept call asynchronous.
 301      Because of that this option is treated special way in this app. */
 302 static int libsrt_set_options_post(URLContext *h, int fd)
 303 {
 304     SRTContext *s = h->priv_data;
 305
 306     if ((s->inputbw >= 0 && libsrt_setsockopt(h, fd, SRTO_INPUTBW, "SRTO_INPUTBW", &s->inputbw, sizeof(s->inputbw)) < 0) ||
 307         (s->oheadbw >= 0 && libsrt_setsockopt(h, fd, SRTO_OHEADBW, "SRTO_OHEADBW", &s->oheadbw, sizeof(s->oheadbw)) < 0)) {
 308         return AVERROR(EIO);
 309     }
 310     return 0;
 311 }
 312
 313 /* - The "PRE" options must be set prior to connecting and can't be altered
 314      on a connected socket, however if set on a listening socket, they are
 315      derived by accept-ed socket. */
 316 static int libsrt_set_options_pre(URLContext *h, int fd)
 317 {
 318     SRTContext *s = h->priv_data;
 319     int yes = 1;
 320     int latency = s->latency / 1000;
 321     int rcvlatency = s->rcvlatency / 1000;
 322     int peerlatency = s->peerlatency / 1000;
 323 #if SRT_VERSION_VALUE >= 0x010302
 324     int snddropdelay = s->snddropdelay > 0 ? s->snddropdelay / 1000 : s->snddropdelay;
 325 #endif
 326     int connect_timeout = s->connect_timeout;
 327
 328     if ((s->mode == SRT_MODE_RENDEZVOUS && libsrt_setsockopt(h, fd, SRTO_RENDEZVOUS, "SRTO_RENDEZVOUS", &yes, sizeof(yes)) < 0) ||
 329         (s->transtype != SRTT_INVALID && libsrt_setsockopt(h, fd, SRTO_TRANSTYPE, "SRTO_TRANSTYPE", &s->transtype, sizeof(s->transtype)) < 0) ||
 330         (s->maxbw >= 0 && libsrt_setsockopt(h, fd, SRTO_MAXBW, "SRTO_MAXBW", &s->maxbw, sizeof(s->maxbw)) < 0) ||
 331         (s->pbkeylen >= 0 && libsrt_setsockopt(h, fd, SRTO_PBKEYLEN, "SRTO_PBKEYLEN", &s->pbkeylen, sizeof(s->pbkeylen)) < 0) ||
 332         (s->passphrase && libsrt_setsockopt(h, fd, SRTO_PASSPHRASE, "SRTO_PASSPHRASE", s->passphrase, strlen(s->passphrase)) < 0) ||
 333 #if SRT_VERSION_VALUE >= 0x010302
 334 #if SRT_VERSION_VALUE >= 0x010401
 335         (s->enforced_encryption >= 0 && libsrt_setsockopt(h, fd, SRTO_ENFORCEDENCRYPTION, "SRTO_ENFORCEDENCRYPTION", &s->enforced_encryption, sizeof(s->enforced_encryption)) < 0) ||
 336 #else
 337         /* SRTO_STRICTENC == SRTO_ENFORCEDENCRYPTION (53), but for compatibility, we used SRTO_STRICTENC */
 338         (s->enforced_encryption >= 0 && libsrt_setsockopt(h, fd, SRTO_STRICTENC, "SRTO_STRICTENC", &s->enforced_encryption, sizeof(s->enforced_encryption)) < 0) ||
 339 #endif
 340         (s->kmrefreshrate >= 0 && libsrt_setsockopt(h, fd, SRTO_KMREFRESHRATE, "SRTO_KMREFRESHRATE", &s->kmrefreshrate, sizeof(s->kmrefreshrate)) < 0) ||
 341         (s->kmpreannounce >= 0 && libsrt_setsockopt(h, fd, SRTO_KMPREANNOUNCE, "SRTO_KMPREANNOUNCE", &s->kmpreannounce, sizeof(s->kmpreannounce)) < 0) ||
 342         (s->snddropdelay  >=-1 && libsrt_setsockopt(h, fd, SRTO_SNDDROPDELAY,  "SRTO_SNDDROPDELAY",  &snddropdelay, sizeof(snddropdelay)) < 0) ||
 343 #endif
 344         (s->mss >= 0 && libsrt_setsockopt(h, fd, SRTO_MSS, "SRTO_MSS", &s->mss, sizeof(s->mss)) < 0) ||
 345         (s->ffs >= 0 && libsrt_setsockopt(h, fd, SRTO_FC, "SRTO_FC", &s->ffs, sizeof(s->ffs)) < 0) ||
 346         (s->ipttl >= 0 && libsrt_setsockopt(h, fd, SRTO_IPTTL, "SRTO_IPTTL", &s->ipttl, sizeof(s->ipttl)) < 0) ||
 347         (s->iptos >= 0 && libsrt_setsockopt(h, fd, SRTO_IPTOS, "SRTO_IPTOS", &s->iptos, sizeof(s->iptos)) < 0) ||
 348         (s->latency >= 0 && libsrt_setsockopt(h, fd, SRTO_LATENCY, "SRTO_LATENCY", &latency, sizeof(latency)) < 0) ||
 349         (s->rcvlatency >= 0 && libsrt_setsockopt(h, fd, SRTO_RCVLATENCY, "SRTO_RCVLATENCY", &rcvlatency, sizeof(rcvlatency)) < 0) ||
 350         (s->peerlatency >= 0 && libsrt_setsockopt(h, fd, SRTO_PEERLATENCY, "SRTO_PEERLATENCY", &peerlatency, sizeof(peerlatency)) < 0) ||
 351         (s->tlpktdrop >= 0 && libsrt_setsockopt(h, fd, SRTO_TLPKTDROP, "SRTO_TLPKTDROP", &s->tlpktdrop, sizeof(s->tlpktdrop)) < 0) ||
 352         (s->nakreport >= 0 && libsrt_setsockopt(h, fd, SRTO_NAKREPORT, "SRTO_NAKREPORT", &s->nakreport, sizeof(s->nakreport)) < 0) ||
 353         (connect_timeout >= 0 && libsrt_setsockopt(h, fd, SRTO_CONNTIMEO, "SRTO_CONNTIMEO", &connect_timeout, sizeof(connect_timeout)) <0 ) ||
 354         (s->sndbuf >= 0 && libsrt_setsockopt(h, fd, SRTO_SNDBUF, "SRTO_SNDBUF", &s->sndbuf, sizeof(s->sndbuf)) < 0) ||
 355         (s->rcvbuf >= 0 && libsrt_setsockopt(h, fd, SRTO_RCVBUF, "SRTO_RCVBUF", &s->rcvbuf, sizeof(s->rcvbuf)) < 0) ||
 356         (s->lossmaxttl >= 0 && libsrt_setsockopt(h, fd, SRTO_LOSSMAXTTL, "SRTO_LOSSMAXTTL", &s->lossmaxttl, sizeof(s->lossmaxttl)) < 0) ||
 357         (s->minversion >= 0 && libsrt_setsockopt(h, fd, SRTO_MINVERSION, "SRTO_MINVERSION", &s->minversion, sizeof(s->minversion)) < 0) ||
 358         (s->streamid && libsrt_setsockopt(h, fd, SRTO_STREAMID, "SRTO_STREAMID", s->streamid, strlen(s->streamid)) < 0) ||
 359 #if SRT_VERSION_VALUE >= 0x010401
 360         (s->smoother && libsrt_setsockopt(h, fd, SRTO_CONGESTION, "SRTO_CONGESTION", s->smoother, strlen(s->smoother)) < 0) ||
 361 #else
 362         (s->smoother && libsrt_setsockopt(h, fd, SRTO_SMOOTHER, "SRTO_SMOOTHER", s->smoother, strlen(s->smoother)) < 0) ||
 363 #endif
 364         (s->messageapi >= 0 && libsrt_setsockopt(h, fd, SRTO_MESSAGEAPI, "SRTO_MESSAGEAPI", &s->messageapi, sizeof(s->messageapi)) < 0) ||
 365         (s->payload_size >= 0 && libsrt_setsockopt(h, fd, SRTO_PAYLOADSIZE, "SRTO_PAYLOADSIZE", &s->payload_size, sizeof(s->payload_size)) < 0) ||
 366         ((h->flags & AVIO_FLAG_WRITE) && libsrt_setsockopt(h, fd, SRTO_SENDER, "SRTO_SENDER", &yes, sizeof(yes)) < 0) ||
 367         (s->tsbpd >= 0 && libsrt_setsockopt(h, fd, SRTO_TSBPDMODE, "SRTO_TSBPDMODE", &s->tsbpd, sizeof(s->tsbpd)) < 0)) {
 368         return AVERROR(EIO);
 369     }
 370
 371     if (s->linger >= 0) {
 372         struct linger lin;
 373         lin.l_linger = s->linger;
 374         lin.l_onoff  = lin.l_linger > 0 ? 1 : 0;
 375         if (libsrt_setsockopt(h, fd, SRTO_LINGER, "SRTO_LINGER", &lin, sizeof(lin)) < 0)
 376             return AVERROR(EIO);
 377     }
 378     return 0;
 379 }
 380
 381
 382 static int libsrt_setup(URLContext *h, const char *uri, int flags)
 383 {
 384     struct addrinfo hints = { 0 }, *ai, *cur_ai;
 385     int port, fd;
 386     SRTContext *s = h->priv_data;
 387     const char *p;
 388     char buf[256];
 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     p = strchr(uri, '?');
 404     if (p) {
 405         if (av_find_info_tag(buf, sizeof(buf), "timeout", p)) {
 406             s->rw_timeout = strtoll(buf, NULL, 10);
 407         }
 408         if (av_find_info_tag(buf, sizeof(buf), "listen_timeout", p)) {
 409             s->listen_timeout = strtoll(buf, NULL, 10);
 410         }
 411     }
 412     if (s->rw_timeout >= 0) {
 413         open_timeout = h->rw_timeout = s->rw_timeout;
 414     }
 415     hints.ai_family = AF_UNSPEC;
 416     hints.ai_socktype = SOCK_DGRAM;
 417     snprintf(portstr, sizeof(portstr), "%d", port);
 418     if (s->mode == SRT_MODE_LISTENER)
 419         hints.ai_flags |= AI_PASSIVE;
 420     ret = getaddrinfo(hostname[0] ? hostname : NULL, portstr, &hints, &ai);
 421     if (ret) {
 422         av_log(h, AV_LOG_ERROR,
 423                "Failed to resolve hostname %s: %s\n",
 424                hostname, gai_strerror(ret));
 425         return AVERROR(EIO);
 426     }
 427
 428     cur_ai = ai;
 429
 430  restart:
 431
 432 #if SRT_VERSION_VALUE >= 0x010401
 433     fd = srt_create_socket();
 434 #else
 435     fd = srt_socket(cur_ai->ai_family, cur_ai->ai_socktype, 0);
 436 #endif
 437     if (fd < 0) {
 438         ret = libsrt_neterrno(h);
 439         goto fail;
 440     }
 441
 442     if ((ret = libsrt_set_options_pre(h, fd)) < 0) {
 443         goto fail;
 444     }
 445
 446     /* Set the socket's send or receive buffer sizes, if specified.
 447        If unspecified or setting fails, system default is used. */
 448     if (s->recv_buffer_size > 0) {
 449         srt_setsockopt(fd, SOL_SOCKET, SRTO_UDP_RCVBUF, &s->recv_buffer_size, sizeof (s->recv_buffer_size));
 450     }
 451     if (s->send_buffer_size > 0) {
 452         srt_setsockopt(fd, SOL_SOCKET, SRTO_UDP_SNDBUF, &s->send_buffer_size, sizeof (s->send_buffer_size));
 453     }
 454     if (libsrt_socket_nonblock(fd, 1) < 0)
 455         av_log(h, AV_LOG_DEBUG, "libsrt_socket_nonblock failed\n");
 456
 457     if (s->mode == SRT_MODE_LISTENER) {
 458         int read_eid = ret = libsrt_epoll_create(h, fd, 0);
 459         if (ret < 0)
 460             goto fail1;
 461         // multi-client
 462         ret = libsrt_listen(read_eid, fd, cur_ai->ai_addr, cur_ai->ai_addrlen, h, s->listen_timeout);
 463         srt_epoll_release(read_eid);
 464         if (ret < 0)
 465             goto fail1;
 466         srt_close(fd);
 467         fd = ret;
 468     } else {
 469         int write_eid = ret = libsrt_epoll_create(h, fd, 1);
 470         if (ret < 0)
 471             goto fail1;
 472         if (s->mode == SRT_MODE_RENDEZVOUS) {
 473             if (srt_bind(fd, cur_ai->ai_addr, cur_ai->ai_addrlen)) {
 474                 ret = libsrt_neterrno(h);
 475                 srt_epoll_release(write_eid);
 476                 goto fail1;
 477             }
 478         }
 479
 480         ret = libsrt_listen_connect(write_eid, fd, cur_ai->ai_addr, cur_ai->ai_addrlen,
 481                                     open_timeout, h, !!cur_ai->ai_next);
 482         srt_epoll_release(write_eid);
 483         if (ret < 0) {
 484             if (ret == AVERROR_EXIT)
 485                 goto fail1;
 486             else
 487                 goto fail;
 488         }
 489     }
 490     if ((ret = libsrt_set_options_post(h, fd)) < 0) {
 491         goto fail;
 492     }
 493
 494     if (flags & AVIO_FLAG_WRITE) {
 495         int packet_size = 0;
 496         int optlen = sizeof(packet_size);
 497         ret = libsrt_getsockopt(h, fd, SRTO_PAYLOADSIZE, "SRTO_PAYLOADSIZE", &packet_size, &optlen);
 498         if (ret < 0)
 499             goto fail1;
 500         if (packet_size > 0)
 501             h->max_packet_size = packet_size;
 502     }
 503
 504     ret = eid = libsrt_epoll_create(h, fd, flags & AVIO_FLAG_WRITE);
 505     if (eid < 0)
 506         goto fail1;
 507
 508     h->is_streamed = 1;
 509     s->fd = fd;
 510     s->eid = eid;
 511
 512     freeaddrinfo(ai);
 513     return 0;
 514
 515  fail:
 516     if (cur_ai->ai_next) {
 517         /* Retry with the next sockaddr */
 518         cur_ai = cur_ai->ai_next;
 519         if (fd >= 0)
 520             srt_close(fd);
 521         ret = 0;
 522         goto restart;
 523     }
 524  fail1:
 525     if (fd >= 0)
 526         srt_close(fd);
 527     freeaddrinfo(ai);
 528     return ret;
 529 }
 530
 531 static int libsrt_open(URLContext *h, const char *uri, int flags)
 532 {
 533     SRTContext *s = h->priv_data;
 534     const char * p;
 535     char buf[1024];
 536     int ret = 0;
 537
 538     if (srt_startup() < 0) {
 539         return AVERROR_UNKNOWN;
 540     }
 541
 542     /* SRT options (srt/srt.h) */
 543     p = strchr(uri, '?');
 544     if (p) {
 545         if (av_find_info_tag(buf, sizeof(buf), "maxbw", p)) {
 546             s->maxbw = strtoll(buf, NULL, 10);
 547         }
 548         if (av_find_info_tag(buf, sizeof(buf), "pbkeylen", p)) {
 549             s->pbkeylen = strtol(buf, NULL, 10);
 550         }
 551         if (av_find_info_tag(buf, sizeof(buf), "passphrase", p)) {
 552             av_freep(&s->passphrase);
 553             s->passphrase = av_strndup(buf, strlen(buf));
 554         }
 555 #if SRT_VERSION_VALUE >= 0x010302
 556         if (av_find_info_tag(buf, sizeof(buf), "enforced_encryption", p)) {
 557             s->enforced_encryption = strtol(buf, NULL, 10);
 558         }
 559         if (av_find_info_tag(buf, sizeof(buf), "kmrefreshrate", p)) {
 560             s->kmrefreshrate = strtol(buf, NULL, 10);
 561         }
 562         if (av_find_info_tag(buf, sizeof(buf), "kmpreannounce", p)) {
 563             s->kmpreannounce = strtol(buf, NULL, 10);
 564         }
 565         if (av_find_info_tag(buf, sizeof(buf), "snddropdelay", p)) {
 566             s->snddropdelay = strtoll(buf, NULL, 10);
 567         }
 568 #endif
 569         if (av_find_info_tag(buf, sizeof(buf), "mss", p)) {
 570             s->mss = strtol(buf, NULL, 10);
 571         }
 572         if (av_find_info_tag(buf, sizeof(buf), "ffs", p)) {
 573             s->ffs = strtol(buf, NULL, 10);
 574         }
 575         if (av_find_info_tag(buf, sizeof(buf), "ipttl", p)) {
 576             s->ipttl = strtol(buf, NULL, 10);
 577         }
 578         if (av_find_info_tag(buf, sizeof(buf), "iptos", p)) {
 579             s->iptos = strtol(buf, NULL, 10);
 580         }
 581         if (av_find_info_tag(buf, sizeof(buf), "inputbw", p)) {
 582             s->inputbw = strtoll(buf, NULL, 10);
 583         }
 584         if (av_find_info_tag(buf, sizeof(buf), "oheadbw", p)) {
 585             s->oheadbw = strtol(buf, NULL, 10);
 586         }
 587         if (av_find_info_tag(buf, sizeof(buf), "latency", p)) {
 588             s->latency = strtoll(buf, NULL, 10);
 589         }
 590         if (av_find_info_tag(buf, sizeof(buf), "tsbpddelay", p)) {
 591             s->latency = strtoll(buf, NULL, 10);
 592         }
 593         if (av_find_info_tag(buf, sizeof(buf), "rcvlatency", p)) {
 594             s->rcvlatency = strtoll(buf, NULL, 10);
 595         }
 596         if (av_find_info_tag(buf, sizeof(buf), "peerlatency", p)) {
 597             s->peerlatency = strtoll(buf, NULL, 10);
 598         }
 599         if (av_find_info_tag(buf, sizeof(buf), "tlpktdrop", p)) {
 600             s->tlpktdrop = strtol(buf, NULL, 10);
 601         }
 602         if (av_find_info_tag(buf, sizeof(buf), "nakreport", p)) {
 603             s->nakreport = strtol(buf, NULL, 10);
 604         }
 605         if (av_find_info_tag(buf, sizeof(buf), "connect_timeout", p)) {
 606             s->connect_timeout = strtoll(buf, NULL, 10);
 607         }
 608         if (av_find_info_tag(buf, sizeof(buf), "payload_size", p) ||
 609             av_find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
 610             s->payload_size = strtol(buf, NULL, 10);
 611         }
 612         if (av_find_info_tag(buf, sizeof(buf), "mode", p)) {
 613             if (!strcmp(buf, "caller")) {
 614                 s->mode = SRT_MODE_CALLER;
 615             } else if (!strcmp(buf, "listener")) {
 616                 s->mode = SRT_MODE_LISTENER;
 617             } else if (!strcmp(buf, "rendezvous")) {
 618                 s->mode = SRT_MODE_RENDEZVOUS;
 619             } else {
 620                 ret = AVERROR(EINVAL);
 621                 goto err;
 622             }
 623         }
 624         if (av_find_info_tag(buf, sizeof(buf), "sndbuf", p)) {
 625             s->sndbuf = strtol(buf, NULL, 10);
 626         }
 627         if (av_find_info_tag(buf, sizeof(buf), "rcvbuf", p)) {
 628             s->rcvbuf = strtol(buf, NULL, 10);
 629         }
 630         if (av_find_info_tag(buf, sizeof(buf), "lossmaxttl", p)) {
 631             s->lossmaxttl = strtol(buf, NULL, 10);
 632         }
 633         if (av_find_info_tag(buf, sizeof(buf), "minversion", p)) {
 634             s->minversion = strtol(buf, NULL, 0);
 635         }
 636         if (av_find_info_tag(buf, sizeof(buf), "streamid", p)) {
 637             av_freep(&s->streamid);
 638             s->streamid = av_strdup(buf);
 639             if (!s->streamid) {
 640                 ret = AVERROR(ENOMEM);
 641                 goto err;
 642             }
 643         }
 644         if (av_find_info_tag(buf, sizeof(buf), "smoother", p)) {
 645             av_freep(&s->smoother);
 646             s->smoother = av_strdup(buf);
 647             if(!s->smoother) {
 648                 ret = AVERROR(ENOMEM);
 649                 goto err;
 650             }
 651         }
 652         if (av_find_info_tag(buf, sizeof(buf), "messageapi", p)) {
 653             s->messageapi = strtol(buf, NULL, 10);
 654         }
 655         if (av_find_info_tag(buf, sizeof(buf), "transtype", p)) {
 656             if (!strcmp(buf, "live")) {
 657                 s->transtype = SRTT_LIVE;
 658             } else if (!strcmp(buf, "file")) {
 659                 s->transtype = SRTT_FILE;
 660             } else {
 661                 ret = AVERROR(EINVAL);
 662                 goto err;
 663             }
 664         }
 665         if (av_find_info_tag(buf, sizeof(buf), "linger", p)) {
 666             s->linger = strtol(buf, NULL, 10);
 667         }
 668     }
 669     ret = libsrt_setup(h, uri, flags);
 670     if (ret < 0)
 671         goto err;
 672     return 0;
 673
 674 err:
 675     av_freep(&s->smoother);
 676     av_freep(&s->streamid);
 677     srt_cleanup();
 678     return ret;
 679 }
 680
 681 static int libsrt_read(URLContext *h, uint8_t *buf, int size)
 682 {
 683     SRTContext *s = h->priv_data;
 684     int ret;
 685
 686     if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
 687         ret = libsrt_network_wait_fd_timeout(h, s->eid, 0, h->rw_timeout, &h->interrupt_callback);
 688         if (ret)
 689             return ret;
 690     }
 691
 692     ret = srt_recvmsg(s->fd, buf, size);
 693     if (ret < 0) {
 694         ret = libsrt_neterrno(h);
 695     }
 696
 697     return ret;
 698 }
 699
 700 static int libsrt_write(URLContext *h, const uint8_t *buf, int size)
 701 {
 702     SRTContext *s = h->priv_data;
 703     int ret;
 704
 705     if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
 706         ret = libsrt_network_wait_fd_timeout(h, s->eid, 1, h->rw_timeout, &h->interrupt_callback);
 707         if (ret)
 708             return ret;
 709     }
 710
 711     ret = srt_sendmsg(s->fd, buf, size, -1, 1);
 712     if (ret < 0) {
 713         ret = libsrt_neterrno(h);
 714     }
 715
 716     return ret;
 717 }
 718
 719 static int libsrt_close(URLContext *h)
 720 {
 721     SRTContext *s = h->priv_data;
 722
 723     srt_epoll_release(s->eid);
 724     srt_close(s->fd);
 725
 726     srt_cleanup();
 727
 728     return 0;
 729 }
 730
 731 static const AVClass libsrt_class = {
 732     .class_name = "libsrt",
 733     .item_name  = av_default_item_name,
 734     .option     = libsrt_options,
 735     .version    = LIBAVUTIL_VERSION_INT,
 736 };
 737
 738 const URLProtocol ff_libsrt_protocol = {
 739     .name                = "srt",
 740     .url_open            = libsrt_open,
 741     .url_read            = libsrt_read,
 742     .url_write           = libsrt_write,
 743     .url_close           = libsrt_close,
 744     .priv_data_size      = sizeof(SRTContext),
 745     .flags               = URL_PROTOCOL_FLAG_NETWORK,
 746     .priv_data_class     = &libsrt_class,
 747 };