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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.     int sndbuf;

  80.     int rcvbuf;

  81.     int lossmaxttl;

  82.     int minversion;

  83.     char *streamid;

  84.     char *smoother;

  85.     int messageapi;

  86.     SRT_TRANSTYPE transtype;

  87. } SRTContext;

  88. 

  89. #define D AV_OPT_FLAG_DECODING_PARAM

  90. #define E AV_OPT_FLAG_ENCODING_PARAM

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

  92. static const AVOption libsrt_options[] = {

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

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

  95.     { "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 },

  96.     { "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 },

  97.     { "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" },

  98.     { "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" },

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

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

  101.     { "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 },

  102.     { "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 },

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

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

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

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

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

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

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

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

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

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

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

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

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

  116.     { "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 },

  117.     { "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" },

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

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

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

  121.     { "sndbuf",         "Send buffer size (in bytes)",                                          OFFSET(sndbuf),           AV_OPT_TYPE_INT,      { .i64 = -1 }, -1, INT_MAX,   .flags = D|E },

  122.     { "rcvbuf",         "Receive buffer size (in bytes)",                                       OFFSET(rcvbuf),           AV_OPT_TYPE_INT,      { .i64 = -1 }, -1, INT_MAX,   .flags = D|E },

  123.     { "lossmaxttl",     "Maximum possible packet reorder tolerance",                            OFFSET(lossmaxttl),       AV_OPT_TYPE_INT,      { .i64 = -1 }, -1, INT_MAX,   .flags = D|E },

  124.     { "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 },

  125.     { "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 },

  126.     { "smoother",       "The type of Smoother used for the transmission for that socket",       OFFSET(smoother),         AV_OPT_TYPE_STRING,   { .str = NULL },              .flags = D|E },

  127.     { "messageapi",     "Enable message API",                                                   OFFSET(messageapi),       AV_OPT_TYPE_INT,      { .i64 = -1 }, -1, 1,         .flags = D|E },

  128.     { "transtype",      "The transmission type for the socket",                                 OFFSET(transtype),        AV_OPT_TYPE_INT,      { .i64 = SRTT_INVALID }, SRTT_LIVE, SRTT_INVALID, .flags = D|E, "transtype" },

  129.     { "live",           NULL, 0, AV_OPT_TYPE_CONST,  { .i64 = SRTT_LIVE }, INT_MIN, INT_MAX, .flags = D|E, "transtype" },

  130.     { "file",           NULL, 0, AV_OPT_TYPE_CONST,  { .i64 = SRTT_FILE }, INT_MIN, INT_MAX, .flags = D|E, "transtype" },

  131.     { NULL }

  132. };

  133. 

  134. static int libsrt_neterrno(URLContext *h)

  135. {

  136.     int err = srt_getlasterror(NULL);

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

  138.     if (err == SRT_EASYNCRCV)

  139.         return AVERROR(EAGAIN);

  140.     return AVERROR_UNKNOWN;

  141. }

  142. 

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

  144. {

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

  146.     if (ret < 0)

  147.         return ret;

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

  149. }

  150. 

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

  152. {

  153.     int ret, len = 1;

  154.     int modes = write ? SRT_EPOLL_OUT : SRT_EPOLL_IN;

  155.     SRTSOCKET ready[1];

  156. 

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

  158.         return libsrt_neterrno(h);

  159.     if (write) {

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

  161.     } else {

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

  163.     }

  164.     if (ret < 0) {

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

  166.             ret = AVERROR(EAGAIN);

  167.         else

  168.             ret = libsrt_neterrno(h);

  169.     } else {

  170.         ret = 0;

  171.     }

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

  173.         return libsrt_neterrno(h);

  174.     return ret;

  175. }

  176. 

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

  178. 

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

  180. {

  181.     int ret;

  182.     int64_t wait_start = 0;

  183. 

  184.     while (1) {

  185.         if (ff_check_interrupt(int_cb))

  186.             return AVERROR_EXIT;

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

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

  189.             return ret;

  190.         if (timeout > 0) {

  191.             if (!wait_start)

  192.                 wait_start = av_gettime_relative();

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

  194.                 return AVERROR(ETIMEDOUT);

  195.         }

  196.     }

  197. }

  198. 

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

  200. {

  201.     int ret;

  202.     int reuse = 1;

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

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

  205.     }

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

  207.     if (ret)

  208.         return libsrt_neterrno(h);

  209. 

  210.     ret = srt_listen(fd, 1);

  211.     if (ret)

  212.         return libsrt_neterrno(h);

  213. 

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

  215.         switch (ret) {

  216.         case AVERROR(ETIMEDOUT):

  217.             continue;

  218.         default:

  219.             return ret;

  220.         }

  221.     }

  222. 

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

  224.     if (ret < 0)

  225.         return libsrt_neterrno(h);

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

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

  228. 

  229.     return ret;

  230. }

  231. 

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

  233. {

  234.     int ret;

  235. 

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

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

  238. 

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

  240.         ret = libsrt_neterrno(h);

  241.         switch (ret) {

  242.         case AVERROR(EINTR):

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

  244.                 return AVERROR_EXIT;

  245.             continue;

  246.         case AVERROR(EINPROGRESS):

  247.         case AVERROR(EAGAIN):

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

  249.             if (ret < 0)

  250.                 return ret;

  251.             ret = srt_getlasterror(NULL);

  252.             srt_clearlasterror();

  253.             if (ret != 0) {

  254.                 char buf[128];

  255.                 ret = AVERROR(ret);

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

  257.                 if (will_try_next)

  258.                     av_log(h, AV_LOG_WARNING,

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

  260.                            h->filename, buf);

  261.                 else

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

  263.                            h->filename, buf);

  264.             }

  265.         default:

  266.             return ret;

  267.         }

  268.     }

  269.     return ret;

  270. }

  271. 

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

  273. {

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

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

  276.         return AVERROR(EIO);

  277.     }

  278.     return 0;

  279. }

  280. 

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

  282. {

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

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

  285.         return AVERROR(EIO);

  286.     }

  287.     return 0;

  288. }

  289. 

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

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

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

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

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

  295. {

  296.     SRTContext *s = h->priv_data;

  297. 

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

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

  300.         return AVERROR(EIO);

  301.     }

  302.     return 0;

  303. }

  304. 

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

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

  307.      derived by accept-ed socket. */

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

  309. {

  310.     SRTContext *s = h->priv_data;

  311.     int yes = 1;

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

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

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

  315.     int connect_timeout = s->connect_timeout;

  316. 

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

  318.         (s->transtype != SRTT_INVALID && libsrt_setsockopt(h, fd, SRTO_TRANSTYPE, "SRTO_TRANSTYPE", &s->transtype, sizeof(s->transtype)) < 0) ||

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

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

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

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

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

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

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

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

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

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

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

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

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

  332.         (s->sndbuf >= 0 && libsrt_setsockopt(h, fd, SRTO_SNDBUF, "SRTO_SNDBUF", &s->sndbuf, sizeof(s->sndbuf)) < 0) ||

  333.         (s->rcvbuf >= 0 && libsrt_setsockopt(h, fd, SRTO_RCVBUF, "SRTO_RCVBUF", &s->rcvbuf, sizeof(s->rcvbuf)) < 0) ||

  334.         (s->lossmaxttl >= 0 && libsrt_setsockopt(h, fd, SRTO_LOSSMAXTTL, "SRTO_LOSSMAXTTL", &s->lossmaxttl, sizeof(s->lossmaxttl)) < 0) ||

  335.         (s->minversion >= 0 && libsrt_setsockopt(h, fd, SRTO_MINVERSION, "SRTO_MINVERSION", &s->minversion, sizeof(s->minversion)) < 0) ||

  336.         (s->streamid && libsrt_setsockopt(h, fd, SRTO_STREAMID, "SRTO_STREAMID", s->streamid, strlen(s->streamid)) < 0) ||

  337.         (s->smoother && libsrt_setsockopt(h, fd, SRTO_SMOOTHER, "SRTO_SMOOTHER", s->smoother, strlen(s->smoother)) < 0) ||

  338.         (s->messageapi >= 0 && libsrt_setsockopt(h, fd, SRTO_MESSAGEAPI, "SRTO_MESSAGEAPI", &s->messageapi, sizeof(s->messageapi)) < 0) ||

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

  340.         ((h->flags & AVIO_FLAG_WRITE) && libsrt_setsockopt(h, fd, SRTO_SENDER, "SRTO_SENDER", &yes, sizeof(yes)) < 0)) {

  341.         return AVERROR(EIO);

  342.     }

  343.     return 0;

  344. }

  345. 

  346. 

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

  348. {

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

  350.     int port, fd = -1;

  351.     SRTContext *s = h->priv_data;

  352.     const char *p;

  353.     char buf[256];

  354.     int ret;

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

  356.     char portstr[10];

  357.     int open_timeout = 5000000;

  358.     int eid;

  359. 

  360.     eid = srt_epoll_create();

  361.     if (eid < 0)

  362.         return libsrt_neterrno(h);

  363.     s->eid = eid;

  364. 

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

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

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

  368.         return AVERROR(EINVAL);

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

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

  371.         return AVERROR(EINVAL);

  372.     }

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

  374.     if (p) {

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

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

  377.         }

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

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

  380.         }

  381.     }

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

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

  384.     }

  385.     hints.ai_family = AF_UNSPEC;

  386.     hints.ai_socktype = SOCK_DGRAM;

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

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

  389.         hints.ai_flags |= AI_PASSIVE;

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

  391.     if (ret) {

  392.         av_log(h, AV_LOG_ERROR,

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

  394.                hostname, gai_strerror(ret));

  395.         return AVERROR(EIO);

  396.     }

  397. 

  398.     cur_ai = ai;

  399. 

  400.  restart:

  401. 

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

  403.     if (fd < 0) {

  404.         ret = libsrt_neterrno(h);

  405.         goto fail;

  406.     }

  407. 

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

  409.         goto fail;

  410.     }

  411. 

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

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

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

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

  416.     }

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

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

  419.     }

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

  421.         // multi-client

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

  423.             goto fail1;

  424.         fd = ret;

  425.     } else {

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

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

  428.             if (ret)

  429.                 goto fail1;

  430.         }

  431. 

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

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

  434.             if (ret == AVERROR_EXIT)

  435.                 goto fail1;

  436.             else

  437.                 goto fail;

  438.         }

  439.     }

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

  441.         goto fail;

  442.     }

  443. 

  444.     if (flags & AVIO_FLAG_WRITE) {

  445.         int packet_size = 0;

  446.         int optlen = sizeof(packet_size);

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

  448.         if (ret < 0)

  449.             goto fail1;

  450.         if (packet_size > 0)

  451.             h->max_packet_size = packet_size;

  452.     }

  453. 

  454.     h->is_streamed = 1;

  455.     s->fd = fd;

  456. 

  457.     freeaddrinfo(ai);

  458.     return 0;

  459. 

  460.  fail:

  461.     if (cur_ai->ai_next) {

  462.         /* Retry with the next sockaddr */

  463.         cur_ai = cur_ai->ai_next;

  464.         if (fd >= 0)

  465.             srt_close(fd);

  466.         ret = 0;

  467.         goto restart;

  468.     }

  469.  fail1:

  470.     if (fd >= 0)

  471.         srt_close(fd);

  472.     freeaddrinfo(ai);

  473.     return ret;

  474. }

  475. 

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

  477. {

  478.     SRTContext *s = h->priv_data;

  479.     const char * p;

  480.     char buf[256];

  481.     int ret = 0;

  482. 

  483.     if (srt_startup() < 0) {

  484.         return AVERROR_UNKNOWN;

  485.     }

  486. 

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

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

  489.     if (p) {

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

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

  492.         }

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

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

  495.         }

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

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

  498.         }

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

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

  501.         }

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

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

  504.         }

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

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

  507.         }

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

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

  510.         }

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

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

  513.         }

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

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

  516.         }

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

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

  519.         }

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

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

  522.         }

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

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

  525.         }

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

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

  528.         }

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

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

  531.         }

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

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

  534.         }

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

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

  537.         }

  538.         if (av_find_info_tag(buf, sizeof(buf), "payload_size", p) ||

  539.             av_find_info_tag(buf, sizeof(buf), "pkt_size", p)) {

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

  541.         }

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

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

  544.                 s->mode = SRT_MODE_CALLER;

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

  546.                 s->mode = SRT_MODE_LISTENER;

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

  548.                 s->mode = SRT_MODE_RENDEZVOUS;

  549.             } else {

  550.                 return AVERROR(EIO);

  551.             }

  552.         }

  553.         if (av_find_info_tag(buf, sizeof(buf), "sndbuf", p)) {

  554.             s->sndbuf = strtol(buf, NULL, 10);

  555.         }

  556.         if (av_find_info_tag(buf, sizeof(buf), "rcvbuf", p)) {

  557.             s->rcvbuf = strtol(buf, NULL, 10);

  558.         }

  559.         if (av_find_info_tag(buf, sizeof(buf), "lossmaxttl", p)) {

  560.             s->lossmaxttl = strtol(buf, NULL, 10);

  561.         }

  562.         if (av_find_info_tag(buf, sizeof(buf), "minversion", p)) {

  563.             s->minversion = strtol(buf, NULL, 0);

  564.         }

  565.         if (av_find_info_tag(buf, sizeof(buf), "streamid", p)) {

  566.             av_freep(&s->streamid);

  567.             s->streamid = av_strdup(buf);

  568.             if (!s->streamid) {

  569.                 ret = AVERROR(ENOMEM);

  570.                 goto err;

  571.             }

  572.         }

  573.         if (av_find_info_tag(buf, sizeof(buf), "smoother", p)) {

  574.             av_freep(&s->smoother);

  575.             s->smoother = av_strdup(buf);

  576.             if(!s->smoother) {

  577.                 ret = AVERROR(ENOMEM);

  578.                 goto err;

  579.             }

  580.         }

  581.         if (av_find_info_tag(buf, sizeof(buf), "messageapi", p)) {

  582.             s->messageapi = strtol(buf, NULL, 10);

  583.         }

  584.         if (av_find_info_tag(buf, sizeof(buf), "transtype", p)) {

  585.             if (!strcmp(buf, "live")) {

  586.                 s->transtype = SRTT_LIVE;

  587.             } else if (!strcmp(buf, "file")) {

  588.                 s->transtype = SRTT_FILE;

  589.             } else {

  590.                 ret = AVERROR(EINVAL);

  591.                 goto err;

  592.             }

  593.         }

  594.     }

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

  596. err:

  597.     av_freep(&s->smoother);

  598.     av_freep(&s->streamid);

  599.     return ret;

  600. }

  601. 

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

  603. {

  604.     SRTContext *s = h->priv_data;

  605.     int ret;

  606. 

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

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

  609.         if (ret)

  610.             return ret;

  611.     }

  612. 

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

  614.     if (ret < 0) {

  615.         ret = libsrt_neterrno(h);

  616.     }

  617. 

  618.     return ret;

  619. }

  620. 

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

  622. {

  623.     SRTContext *s = h->priv_data;

  624.     int ret;

  625. 

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

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

  628.         if (ret)

  629.             return ret;

  630.     }

  631. 

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

  633.     if (ret < 0) {

  634.         ret = libsrt_neterrno(h);

  635.     }

  636. 

  637.     return ret;

  638. }

  639. 

  640. static int libsrt_close(URLContext *h)

  641. {

  642.     SRTContext *s = h->priv_data;

  643. 

  644.     srt_close(s->fd);

  645. 

  646.     srt_epoll_release(s->eid);

  647. 

  648.     srt_cleanup();

  649. 

  650.     return 0;

  651. }

  652. 

  653. static int libsrt_get_file_handle(URLContext *h)

  654. {

  655.     SRTContext *s = h->priv_data;

  656.     return s->fd;

  657. }

  658. 

  659. static const AVClass libsrt_class = {

  660.     .class_name = "libsrt",

  661.     .item_name  = av_default_item_name,

  662.     .option     = libsrt_options,

  663.     .version    = LIBAVUTIL_VERSION_INT,

  664. };

  665. 

  666. const URLProtocol ff_libsrt_protocol = {

  667.     .name                = "srt",

  668.     .url_open            = libsrt_open,

  669.     .url_read            = libsrt_read,

  670.     .url_write           = libsrt_write,

  671.     .url_close           = libsrt_close,

  672.     .url_get_file_handle = libsrt_get_file_handle,

  673.     .priv_data_size      = sizeof(SRTContext),

  674.     .flags               = URL_PROTOCOL_FLAG_NETWORK,

  675.     .priv_data_class     = &libsrt_class,

  676. };