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FFmpeg/libavformat/libsrt.c

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  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 eid;

  57.     int64_t rw_timeout;

  58.     int64_t listen_timeout;

  59.     int recv_buffer_size;

  60.     int send_buffer_size;

  61. 

  62.     int64_t maxbw;

  63.     int pbkeylen;

  64.     char *passphrase;

  65.     int mss;

  66.     int ffs;

  67.     int ipttl;

  68.     int iptos;

  69.     int64_t inputbw;

  70.     int oheadbw;

  71.     int64_t latency;

  72.     int tlpktdrop;

  73.     int nakreport;

  74.     int64_t connect_timeout;

  75.     int payload_size;

  76.     int64_t rcvlatency;

  77.     int64_t peerlatency;

  78.     enum SRTMode mode;

  79. } SRTContext;

  80. 

  81. #define D AV_OPT_FLAG_DECODING_PARAM

  82. #define E AV_OPT_FLAG_ENCODING_PARAM

  83. #define OFFSET(x) offsetof(SRTContext, x)

  84. static const AVOption libsrt_options[] = {

  85.     { "rw_timeout",     "Timeout of socket I/O operations",                                     OFFSET(rw_timeout),       AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },

  86.     { "listen_timeout", "Connection awaiting timeout",                                          OFFSET(listen_timeout),   AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },

  87.     { "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 },

  88.     { "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 },

  89.     { "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" },

  90.     { "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" },

  91.     { "ts_size",        NULL, 0, AV_OPT_TYPE_CONST,  { .i64 = SRT_LIVE_DEFAULT_PAYLOAD_SIZE }, INT_MIN, INT_MAX, .flags = D|E, "payload_size" },

  92.     { "max_size",       NULL, 0, AV_OPT_TYPE_CONST,  { .i64 = SRT_LIVE_MAX_PAYLOAD_SIZE },     INT_MIN, INT_MAX, .flags = D|E, "payload_size" },

  93.     { "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 },

  94.     { "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 },

  95.     { "passphrase",     "Crypto PBKDF2 Passphrase size[0,10..64] 0:disable crypto",             OFFSET(passphrase),       AV_OPT_TYPE_STRING,   { .str = NULL },              .flags = D|E },

  96.     { "mss",            "The Maximum Segment Size",                                             OFFSET(mss),              AV_OPT_TYPE_INT,      { .i64 = -1 }, -1, 1500,      .flags = D|E },

  97.     { "ffs",            "Flight flag size (window size) (in bytes)",                            OFFSET(ffs),              AV_OPT_TYPE_INT,      { .i64 = -1 }, -1, INT_MAX,   .flags = D|E },

  98.     { "ipttl",          "IP Time To Live",                                                      OFFSET(ipttl),            AV_OPT_TYPE_INT,      { .i64 = -1 }, -1, 255,       .flags = D|E },

  99.     { "iptos",          "IP Type of Service",                                                   OFFSET(iptos),            AV_OPT_TYPE_INT,      { .i64 = -1 }, -1, 255,       .flags = D|E },

  100.     { "inputbw",        "Estimated input stream rate",                                          OFFSET(inputbw),          AV_OPT_TYPE_INT64,    { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },

  101.     { "oheadbw",        "MaxBW ceiling based on % over input stream rate",                      OFFSET(oheadbw),          AV_OPT_TYPE_INT,      { .i64 = -1 }, -1, 100,       .flags = D|E },

  102.     { "latency",        "receiver delay to absorb bursts of missed packet retransmissions",     OFFSET(latency),          AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },

  103.     { "tsbpddelay",     "deprecated, same effect as latency option",                            OFFSET(latency),          AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },

  104.     { "rcvlatency",     "receive latency",                                                      OFFSET(rcvlatency),       AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },

  105.     { "peerlatency",    "peer latency",                                                         OFFSET(peerlatency),      AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },

  106.     { "tlpktdrop",      "Enable receiver pkt drop",                                             OFFSET(tlpktdrop),        AV_OPT_TYPE_INT,      { .i64 = -1 }, -1, 1,         .flags = D|E },

  107.     { "nakreport",      "Enable receiver to send periodic NAK reports",                         OFFSET(nakreport),        AV_OPT_TYPE_INT,      { .i64 = -1 }, -1, 1,         .flags = D|E },

  108.     { "connect_timeout", "Connect timeout. Caller default: 3000, rendezvous (x 10)",            OFFSET(connect_timeout),  AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },

  109.     { "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" },

  110.     { "caller",         NULL, 0, AV_OPT_TYPE_CONST,  { .i64 = SRT_MODE_CALLER },     INT_MIN, INT_MAX, .flags = D|E, "mode" },

  111.     { "listener",       NULL, 0, AV_OPT_TYPE_CONST,  { .i64 = SRT_MODE_LISTENER },   INT_MIN, INT_MAX, .flags = D|E, "mode" },

  112.     { "rendezvous",     NULL, 0, AV_OPT_TYPE_CONST,  { .i64 = SRT_MODE_RENDEZVOUS }, INT_MIN, INT_MAX, .flags = D|E, "mode" },

  113.     { NULL }

  114. };

  115. 

  116. static int libsrt_neterrno(URLContext *h)

  117. {

  118.     int err = srt_getlasterror(NULL);

  119.     av_log(h, AV_LOG_ERROR, "%s\n", srt_getlasterror_str());

  120.     if (err == SRT_EASYNCRCV)

  121.         return AVERROR(EAGAIN);

  122.     return AVERROR_UNKNOWN;

  123. }

  124. 

  125. static int libsrt_socket_nonblock(int socket, int enable)

  126. {

  127.     int ret = srt_setsockopt(socket, 0, SRTO_SNDSYN, &enable, sizeof(enable));

  128.     if (ret < 0)

  129.         return ret;

  130.     return srt_setsockopt(socket, 0, SRTO_RCVSYN, &enable, sizeof(enable));

  131. }

  132. 

  133. static int libsrt_network_wait_fd(URLContext *h, int eid, int fd, int write)

  134. {

  135.     int ret, len = 1;

  136.     int modes = write ? SRT_EPOLL_OUT : SRT_EPOLL_IN;

  137.     SRTSOCKET ready[1];

  138. 

  139.     if (srt_epoll_add_usock(eid, fd, &modes) < 0)

  140.         return libsrt_neterrno(h);

  141.     if (write) {

  142.         ret = srt_epoll_wait(eid, 0, 0, ready, &len, POLLING_TIME, 0, 0, 0, 0);

  143.     } else {

  144.         ret = srt_epoll_wait(eid, ready, &len, 0, 0, POLLING_TIME, 0, 0, 0, 0);

  145.     }

  146.     if (ret < 0) {

  147.         if (srt_getlasterror(NULL) == SRT_ETIMEOUT)

  148.             ret = AVERROR(EAGAIN);

  149.         else

  150.             ret = libsrt_neterrno(h);

  151.     } else {

  152.         ret = 0;

  153.     }

  154.     if (srt_epoll_remove_usock(eid, fd) < 0)

  155.         return libsrt_neterrno(h);

  156.     return ret;

  157. }

  158. 

  159. /* TODO de-duplicate code from ff_network_wait_fd_timeout() */

  160. 

  161. static int libsrt_network_wait_fd_timeout(URLContext *h, int eid, int fd, int write, int64_t timeout, AVIOInterruptCB *int_cb)

  162. {

  163.     int ret;

  164.     int64_t wait_start = 0;

  165. 

  166.     while (1) {

  167.         if (ff_check_interrupt(int_cb))

  168.             return AVERROR_EXIT;

  169.         ret = libsrt_network_wait_fd(h, eid, fd, write);

  170.         if (ret != AVERROR(EAGAIN))

  171.             return ret;

  172.         if (timeout > 0) {

  173.             if (!wait_start)

  174.                 wait_start = av_gettime_relative();

  175.             else if (av_gettime_relative() - wait_start > timeout)

  176.                 return AVERROR(ETIMEDOUT);

  177.         }

  178.     }

  179. }

  180. 

  181. static int libsrt_listen(int eid, int fd, const struct sockaddr *addr, socklen_t addrlen, URLContext *h, int timeout)

  182. {

  183.     int ret;

  184.     int reuse = 1;

  185.     if (srt_setsockopt(fd, SOL_SOCKET, SRTO_REUSEADDR, &reuse, sizeof(reuse))) {

  186.         av_log(h, AV_LOG_WARNING, "setsockopt(SRTO_REUSEADDR) failed\n");

  187.     }

  188.     ret = srt_bind(fd, addr, addrlen);

  189.     if (ret)

  190.         return libsrt_neterrno(h);

  191. 

  192.     ret = srt_listen(fd, 1);

  193.     if (ret)

  194.         return libsrt_neterrno(h);

  195. 

  196.     while ((ret = libsrt_network_wait_fd_timeout(h, eid, fd, 1, timeout, &h->interrupt_callback))) {

  197.         switch (ret) {

  198.         case AVERROR(ETIMEDOUT):

  199.             continue;

  200.         default:

  201.             return ret;

  202.         }

  203.     }

  204. 

  205.     ret = srt_accept(fd, NULL, NULL);

  206.     if (ret < 0)

  207.         return libsrt_neterrno(h);

  208.     if (libsrt_socket_nonblock(ret, 1) < 0)

  209.         av_log(h, AV_LOG_DEBUG, "libsrt_socket_nonblock failed\n");

  210. 

  211.     return ret;

  212. }

  213. 

  214. static int libsrt_listen_connect(int eid, int fd, const struct sockaddr *addr, socklen_t addrlen, int timeout, URLContext *h, int will_try_next)

  215. {

  216.     int ret;

  217. 

  218.     if (libsrt_socket_nonblock(fd, 1) < 0)

  219.         av_log(h, AV_LOG_DEBUG, "ff_socket_nonblock failed\n");

  220. 

  221.     while ((ret = srt_connect(fd, addr, addrlen))) {

  222.         ret = libsrt_neterrno(h);

  223.         switch (ret) {

  224.         case AVERROR(EINTR):

  225.             if (ff_check_interrupt(&h->interrupt_callback))

  226.                 return AVERROR_EXIT;

  227.             continue;

  228.         case AVERROR(EINPROGRESS):

  229.         case AVERROR(EAGAIN):

  230.             ret = libsrt_network_wait_fd_timeout(h, eid, fd, 1, timeout, &h->interrupt_callback);

  231.             if (ret < 0)

  232.                 return ret;

  233.             ret = srt_getlasterror(NULL);

  234.             srt_clearlasterror();

  235.             if (ret != 0) {

  236.                 char buf[128];

  237.                 ret = AVERROR(ret);

  238.                 av_strerror(ret, buf, sizeof(buf));

  239.                 if (will_try_next)

  240.                     av_log(h, AV_LOG_WARNING,

  241.                            "Connection to %s failed (%s), trying next address\n",

  242.                            h->filename, buf);

  243.                 else

  244.                     av_log(h, AV_LOG_ERROR, "Connection to %s failed: %s\n",

  245.                            h->filename, buf);

  246.             }

  247.         default:

  248.             return ret;

  249.         }

  250.     }

  251.     return ret;

  252. }

  253. 

  254. static int libsrt_setsockopt(URLContext *h, int fd, SRT_SOCKOPT optname, const char * optnamestr, const void * optval, int optlen)

  255. {

  256.     if (srt_setsockopt(fd, 0, optname, optval, optlen) < 0) {

  257.         av_log(h, AV_LOG_ERROR, "failed to set option %s on socket: %s\n", optnamestr, srt_getlasterror_str());

  258.         return AVERROR(EIO);

  259.     }

  260.     return 0;

  261. }

  262. 

  263. static int libsrt_getsockopt(URLContext *h, int fd, SRT_SOCKOPT optname, const char * optnamestr, void * optval, int * optlen)

  264. {

  265.     if (srt_getsockopt(fd, 0, optname, optval, optlen) < 0) {

  266.         av_log(h, AV_LOG_ERROR, "failed to get option %s on socket: %s\n", optnamestr, srt_getlasterror_str());

  267.         return AVERROR(EIO);

  268.     }

  269.     return 0;

  270. }

  271. 

  272. /* - The "POST" options can be altered any time on a connected socket.

  273.      They MAY have also some meaning when set prior to connecting; such

  274.      option is SRTO_RCVSYN, which makes connect/accept call asynchronous.

  275.      Because of that this option is treated special way in this app. */

  276. static int libsrt_set_options_post(URLContext *h, int fd)

  277. {

  278.     SRTContext *s = h->priv_data;

  279. 

  280.     if ((s->inputbw >= 0 && libsrt_setsockopt(h, fd, SRTO_INPUTBW, "SRTO_INPUTBW", &s->inputbw, sizeof(s->inputbw)) < 0) ||

  281.         (s->oheadbw >= 0 && libsrt_setsockopt(h, fd, SRTO_OHEADBW, "SRTO_OHEADBW", &s->oheadbw, sizeof(s->oheadbw)) < 0)) {

  282.         return AVERROR(EIO);

  283.     }

  284.     return 0;

  285. }

  286. 

  287. /* - The "PRE" options must be set prior to connecting and can't be altered

  288.      on a connected socket, however if set on a listening socket, they are

  289.      derived by accept-ed socket. */

  290. static int libsrt_set_options_pre(URLContext *h, int fd)

  291. {

  292.     SRTContext *s = h->priv_data;

  293.     int yes = 1;

  294.     int latency = s->latency / 1000;

  295.     int rcvlatency = s->rcvlatency / 1000;

  296.     int peerlatency = s->peerlatency / 1000;

  297.     int connect_timeout = s->connect_timeout;

  298. 

  299.     if ((s->mode == SRT_MODE_RENDEZVOUS && libsrt_setsockopt(h, fd, SRTO_RENDEZVOUS, "SRTO_RENDEZVOUS", &yes, sizeof(yes)) < 0) ||

  300.         (s->maxbw >= 0 && libsrt_setsockopt(h, fd, SRTO_MAXBW, "SRTO_MAXBW", &s->maxbw, sizeof(s->maxbw)) < 0) ||

  301.         (s->pbkeylen >= 0 && libsrt_setsockopt(h, fd, SRTO_PBKEYLEN, "SRTO_PBKEYLEN", &s->pbkeylen, sizeof(s->pbkeylen)) < 0) ||

  302.         (s->passphrase && libsrt_setsockopt(h, fd, SRTO_PASSPHRASE, "SRTO_PASSPHRASE", s->passphrase, strlen(s->passphrase)) < 0) ||

  303.         (s->mss >= 0 && libsrt_setsockopt(h, fd, SRTO_MSS, "SRTO_MMS", &s->mss, sizeof(s->mss)) < 0) ||

  304.         (s->ffs >= 0 && libsrt_setsockopt(h, fd, SRTO_FC, "SRTO_FC", &s->ffs, sizeof(s->ffs)) < 0) ||

  305.         (s->ipttl >= 0 && libsrt_setsockopt(h, fd, SRTO_IPTTL, "SRTO_UPTTL", &s->ipttl, sizeof(s->ipttl)) < 0) ||

  306.         (s->iptos >= 0 && libsrt_setsockopt(h, fd, SRTO_IPTOS, "SRTO_IPTOS", &s->iptos, sizeof(s->iptos)) < 0) ||

  307.         (s->latency >= 0 && libsrt_setsockopt(h, fd, SRTO_LATENCY, "SRTO_LATENCY", &latency, sizeof(latency)) < 0) ||

  308.         (s->rcvlatency >= 0 && libsrt_setsockopt(h, fd, SRTO_RCVLATENCY, "SRTO_RCVLATENCY", &rcvlatency, sizeof(rcvlatency)) < 0) ||

  309.         (s->peerlatency >= 0 && libsrt_setsockopt(h, fd, SRTO_PEERLATENCY, "SRTO_PEERLATENCY", &peerlatency, sizeof(peerlatency)) < 0) ||

  310.         (s->tlpktdrop >= 0 && libsrt_setsockopt(h, fd, SRTO_TLPKTDROP, "SRTO_TLPKDROP", &s->tlpktdrop, sizeof(s->tlpktdrop)) < 0) ||

  311.         (s->nakreport >= 0 && libsrt_setsockopt(h, fd, SRTO_NAKREPORT, "SRTO_NAKREPORT", &s->nakreport, sizeof(s->nakreport)) < 0) ||

  312.         (connect_timeout >= 0 && libsrt_setsockopt(h, fd, SRTO_CONNTIMEO, "SRTO_CONNTIMEO", &connect_timeout, sizeof(connect_timeout)) <0 )) ||

  313.         (s->payload_size >= 0 && libsrt_setsockopt(h, fd, SRTO_PAYLOADSIZE, "SRTO_PAYLOADSIZE", &s->payload_size, sizeof(s->payload_size)) < 0) {

  314.         return AVERROR(EIO);

  315.     }

  316.     return 0;

  317. }

  318. 

  319. 

  320. static int libsrt_setup(URLContext *h, const char *uri, int flags)

  321. {

  322.     struct addrinfo hints = { 0 }, *ai, *cur_ai;

  323.     int port, fd = -1;

  324.     SRTContext *s = h->priv_data;

  325.     const char *p;

  326.     char buf[256];

  327.     int ret;

  328.     char hostname[1024],proto[1024],path[1024];

  329.     char portstr[10];

  330.     int open_timeout = 5000000;

  331.     int eid;

  332. 

  333.     eid = srt_epoll_create();

  334.     if (eid < 0)

  335.         return libsrt_neterrno(h);

  336.     s->eid = eid;

  337. 

  338.     av_url_split(proto, sizeof(proto), NULL, 0, hostname, sizeof(hostname),

  339.         &port, path, sizeof(path), uri);

  340.     if (strcmp(proto, "srt"))

  341.         return AVERROR(EINVAL);

  342.     if (port <= 0 || port >= 65536) {

  343.         av_log(h, AV_LOG_ERROR, "Port missing in uri\n");

  344.         return AVERROR(EINVAL);

  345.     }

  346.     p = strchr(uri, '?');

  347.     if (p) {

  348.         if (av_find_info_tag(buf, sizeof(buf), "timeout", p)) {

  349.             s->rw_timeout = strtol(buf, NULL, 10);

  350.         }

  351.         if (av_find_info_tag(buf, sizeof(buf), "listen_timeout", p)) {

  352.             s->listen_timeout = strtol(buf, NULL, 10);

  353.         }

  354.     }

  355.     if (s->rw_timeout >= 0) {

  356.         open_timeout = h->rw_timeout = s->rw_timeout;

  357.     }

  358.     hints.ai_family = AF_UNSPEC;

  359.     hints.ai_socktype = SOCK_DGRAM;

  360.     snprintf(portstr, sizeof(portstr), "%d", port);

  361.     if (s->mode == SRT_MODE_LISTENER)

  362.         hints.ai_flags |= AI_PASSIVE;

  363.     ret = getaddrinfo(hostname[0] ? hostname : NULL, portstr, &hints, &ai);

  364.     if (ret) {

  365.         av_log(h, AV_LOG_ERROR,

  366.                "Failed to resolve hostname %s: %s\n",

  367.                hostname, gai_strerror(ret));

  368.         return AVERROR(EIO);

  369.     }

  370. 

  371.     cur_ai = ai;

  372. 

  373.  restart:

  374. 

  375.     fd = srt_socket(cur_ai->ai_family, cur_ai->ai_socktype, 0);

  376.     if (fd < 0) {

  377.         ret = libsrt_neterrno(h);

  378.         goto fail;

  379.     }

  380. 

  381.     if ((ret = libsrt_set_options_pre(h, fd)) < 0) {

  382.         goto fail;

  383.     }

  384. 

  385.     /* Set the socket's send or receive buffer sizes, if specified.

  386.        If unspecified or setting fails, system default is used. */

  387.     if (s->recv_buffer_size > 0) {

  388.         srt_setsockopt(fd, SOL_SOCKET, SRTO_UDP_RCVBUF, &s->recv_buffer_size, sizeof (s->recv_buffer_size));

  389.     }

  390.     if (s->send_buffer_size > 0) {

  391.         srt_setsockopt(fd, SOL_SOCKET, SRTO_UDP_SNDBUF, &s->send_buffer_size, sizeof (s->send_buffer_size));

  392.     }

  393.     if (s->mode == SRT_MODE_LISTENER) {

  394.         // multi-client

  395.         if ((ret = libsrt_listen(s->eid, fd, cur_ai->ai_addr, cur_ai->ai_addrlen, h, open_timeout / 1000)) < 0)

  396.             goto fail1;

  397.         fd = ret;

  398.     } else {

  399.         if (s->mode == SRT_MODE_RENDEZVOUS) {

  400.             ret = srt_bind(fd, cur_ai->ai_addr, cur_ai->ai_addrlen);

  401.             if (ret)

  402.                 goto fail1;

  403.         }

  404. 

  405.         if ((ret = libsrt_listen_connect(s->eid, fd, cur_ai->ai_addr, cur_ai->ai_addrlen,

  406.                                           open_timeout / 1000, h, !!cur_ai->ai_next)) < 0) {

  407.             if (ret == AVERROR_EXIT)

  408.                 goto fail1;

  409.             else

  410.                 goto fail;

  411.         }

  412.     }

  413.     if ((ret = libsrt_set_options_post(h, fd)) < 0) {

  414.         goto fail;

  415.     }

  416. 

  417.     if (flags & AVIO_FLAG_WRITE) {

  418.         int packet_size = 0;

  419.         int optlen = sizeof(packet_size);

  420.         ret = libsrt_getsockopt(h, fd, SRTO_PAYLOADSIZE, "SRTO_PAYLOADSIZE", &packet_size, &optlen);

  421.         if (ret < 0)

  422.             goto fail1;

  423.         if (packet_size > 0)

  424.             h->max_packet_size = packet_size;

  425.     }

  426. 

  427.     h->is_streamed = 1;

  428.     s->fd = fd;

  429. 

  430.     freeaddrinfo(ai);

  431.     return 0;

  432. 

  433.  fail:

  434.     if (cur_ai->ai_next) {

  435.         /* Retry with the next sockaddr */

  436.         cur_ai = cur_ai->ai_next;

  437.         if (fd >= 0)

  438.             srt_close(fd);

  439.         ret = 0;

  440.         goto restart;

  441.     }

  442.  fail1:

  443.     if (fd >= 0)

  444.         srt_close(fd);

  445.     freeaddrinfo(ai);

  446.     return ret;

  447. }

  448. 

  449. static int libsrt_open(URLContext *h, const char *uri, int flags)

  450. {

  451.     SRTContext *s = h->priv_data;

  452.     const char * p;

  453.     char buf[256];

  454. 

  455.     if (srt_startup() < 0) {

  456.         return AVERROR_UNKNOWN;

  457.     }

  458. 

  459.     /* SRT options (srt/srt.h) */

  460.     p = strchr(uri, '?');

  461.     if (p) {

  462.         if (av_find_info_tag(buf, sizeof(buf), "maxbw", p)) {

  463.             s->maxbw = strtoll(buf, NULL, 0);

  464.         }

  465.         if (av_find_info_tag(buf, sizeof(buf), "pbkeylen", p)) {

  466.             s->pbkeylen = strtol(buf, NULL, 10);

  467.         }

  468.         if (av_find_info_tag(buf, sizeof(buf), "passphrase", p)) {

  469.             s->passphrase = av_strndup(buf, strlen(buf));

  470.         }

  471.         if (av_find_info_tag(buf, sizeof(buf), "mss", p)) {

  472.             s->mss = strtol(buf, NULL, 10);

  473.         }

  474.         if (av_find_info_tag(buf, sizeof(buf), "ffs", p)) {

  475.             s->ffs = strtol(buf, NULL, 10);

  476.         }

  477.         if (av_find_info_tag(buf, sizeof(buf), "ipttl", p)) {

  478.             s->ipttl = strtol(buf, NULL, 10);

  479.         }

  480.         if (av_find_info_tag(buf, sizeof(buf), "iptos", p)) {

  481.             s->iptos = strtol(buf, NULL, 10);

  482.         }

  483.         if (av_find_info_tag(buf, sizeof(buf), "inputbw", p)) {

  484.             s->inputbw = strtoll(buf, NULL, 10);

  485.         }

  486.         if (av_find_info_tag(buf, sizeof(buf), "oheadbw", p)) {

  487.             s->oheadbw = strtoll(buf, NULL, 10);

  488.         }

  489.         if (av_find_info_tag(buf, sizeof(buf), "latency", p)) {

  490.             s->latency = strtol(buf, NULL, 10);

  491.         }

  492.         if (av_find_info_tag(buf, sizeof(buf), "tsbpddelay", p)) {

  493.             s->latency = strtol(buf, NULL, 10);

  494.         }

  495.         if (av_find_info_tag(buf, sizeof(buf), "rcvlatency", p)) {

  496.             s->rcvlatency = strtol(buf, NULL, 10);

  497.         }

  498.         if (av_find_info_tag(buf, sizeof(buf), "peerlatency", p)) {

  499.             s->peerlatency = strtol(buf, NULL, 10);

  500.         }

  501.         if (av_find_info_tag(buf, sizeof(buf), "tlpktdrop", p)) {

  502.             s->tlpktdrop = strtol(buf, NULL, 10);

  503.         }

  504.         if (av_find_info_tag(buf, sizeof(buf), "nakreport", p)) {

  505.             s->nakreport = strtol(buf, NULL, 10);

  506.         }

  507.         if (av_find_info_tag(buf, sizeof(buf), "connect_timeout", p)) {

  508.             s->connect_timeout = strtol(buf, NULL, 10);

  509.         }

  510.         if (av_find_info_tag(buf, sizeof(buf), "payload_size", p)) {

  511.             s->payload_size = strtol(buf, NULL, 10);

  512.         }

  513.         if (av_find_info_tag(buf, sizeof(buf), "mode", p)) {

  514.             if (!strcmp(buf, "caller")) {

  515.                 s->mode = SRT_MODE_CALLER;

  516.             } else if (!strcmp(buf, "listener")) {

  517.                 s->mode = SRT_MODE_LISTENER;

  518.             } else if (!strcmp(buf, "rendezvous")) {

  519.                 s->mode = SRT_MODE_RENDEZVOUS;

  520.             } else {

  521.                 return AVERROR(EIO);

  522.             }

  523.         }

  524.     }

  525.     return libsrt_setup(h, uri, flags);

  526. }

  527. 

  528. static int libsrt_read(URLContext *h, uint8_t *buf, int size)

  529. {

  530.     SRTContext *s = h->priv_data;

  531.     int ret;

  532. 

  533.     if (!(h->flags & AVIO_FLAG_NONBLOCK)) {

  534.         ret = libsrt_network_wait_fd_timeout(h, s->eid, s->fd, 0, h->rw_timeout, &h->interrupt_callback);

  535.         if (ret)

  536.             return ret;

  537.     }

  538. 

  539.     ret = srt_recvmsg(s->fd, buf, size);

  540.     if (ret < 0) {

  541.         ret = libsrt_neterrno(h);

  542.     }

  543. 

  544.     return ret;

  545. }

  546. 

  547. static int libsrt_write(URLContext *h, const uint8_t *buf, int size)

  548. {

  549.     SRTContext *s = h->priv_data;

  550.     int ret;

  551. 

  552.     if (!(h->flags & AVIO_FLAG_NONBLOCK)) {

  553.         ret = libsrt_network_wait_fd_timeout(h, s->eid, s->fd, 1, h->rw_timeout, &h->interrupt_callback);

  554.         if (ret)

  555.             return ret;

  556.     }

  557. 

  558.     ret = srt_sendmsg(s->fd, buf, size, -1, 0);

  559.     if (ret < 0) {

  560.         ret = libsrt_neterrno(h);

  561.     }

  562. 

  563.     return ret;

  564. }

  565. 

  566. static int libsrt_close(URLContext *h)

  567. {

  568.     SRTContext *s = h->priv_data;

  569. 

  570.     srt_close(s->fd);

  571. 

  572.     srt_epoll_release(s->eid);

  573. 

  574.     srt_cleanup();

  575. 

  576.     return 0;

  577. }

  578. 

  579. static int libsrt_get_file_handle(URLContext *h)

  580. {

  581.     SRTContext *s = h->priv_data;

  582.     return s->fd;

  583. }

  584. 

  585. static const AVClass libsrt_class = {

  586.     .class_name = "libsrt",

  587.     .item_name  = av_default_item_name,

  588.     .option     = libsrt_options,

  589.     .version    = LIBAVUTIL_VERSION_INT,

  590. };

  591. 

  592. const URLProtocol ff_libsrt_protocol = {

  593.     .name                = "srt",

  594.     .url_open            = libsrt_open,

  595.     .url_read            = libsrt_read,

  596.     .url_write           = libsrt_write,

  597.     .url_close           = libsrt_close,

  598.     .url_get_file_handle = libsrt_get_file_handle,

  599.     .priv_data_size      = sizeof(SRTContext),

  600.     .flags               = URL_PROTOCOL_FLAG_NETWORK,

  601.     .priv_data_class     = &libsrt_class,

  602. };