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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. #if SRT_VERSION_VALUE >= 0x010302

  66.     int enforced_encryption;

  67.     int kmrefreshrate;

  68.     int kmpreannounce;

  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. } SRTContext;

  94. 

  95. #define D AV_OPT_FLAG_DECODING_PARAM

  96. #define E AV_OPT_FLAG_ENCODING_PARAM

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

  98. static const AVOption libsrt_options[] = {

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

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

  101.     { "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 },

  102.     { "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 },

  103.     { "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" },

  104.     { "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" },

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

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

  107.     { "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 },

  108.     { "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 },

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

  110. #if SRT_VERSION_VALUE >= 0x010302

  111.     { "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 },

  112.     { "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 },

  113.     { "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 },

  114. #endif

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

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

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

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

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

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

  121.     { "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 },

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

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

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

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

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

  127.     { "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 },

  128.     { "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" },

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

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

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

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

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

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

  135.     { "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 },

  136.     { "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 },

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

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

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

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

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

  142.     { "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 },

  143.     { NULL }

  144. };

  145. 

  146. static int libsrt_neterrno(URLContext *h)

  147. {

  148.     int os_errno;

  149.     int err = srt_getlasterror(&os_errno);

  150.     if (err == SRT_EASYNCRCV || err == SRT_EASYNCSND)

  151.         return AVERROR(EAGAIN);

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

  153.     return os_errno ? AVERROR(os_errno) : AVERROR_UNKNOWN;

  154. }

  155. 

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

  157. {

  158.     int ret, blocking = enable ? 0 : 1;

  159.     /* Setting SRTO_{SND,RCV}SYN options to 1 enable blocking mode, setting them to 0 enable non-blocking mode. */

  160.     ret = srt_setsockopt(socket, 0, SRTO_SNDSYN, &blocking, sizeof(blocking));

  161.     if (ret < 0)

  162.         return ret;

  163.     return srt_setsockopt(socket, 0, SRTO_RCVSYN, &blocking, sizeof(blocking));

  164. }

  165. 

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

  167. {

  168.     int ret, len = 1, errlen = 1;

  169.     int modes = SRT_EPOLL_ERR | (write ? SRT_EPOLL_OUT : SRT_EPOLL_IN);

  170.     SRTSOCKET ready[1];

  171.     SRTSOCKET error[1];

  172. 

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

  174.         return libsrt_neterrno(h);

  175.     if (write) {

  176.         ret = srt_epoll_wait(eid, error, &errlen, ready, &len, POLLING_TIME, 0, 0, 0, 0);

  177.     } else {

  178.         ret = srt_epoll_wait(eid, ready, &len, error, &errlen, POLLING_TIME, 0, 0, 0, 0);

  179.     }

  180.     if (ret < 0) {

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

  182.             ret = AVERROR(EAGAIN);

  183.         else

  184.             ret = libsrt_neterrno(h);

  185.     } else {

  186.         ret = errlen ? AVERROR(EIO) : 0;

  187.     }

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

  189.         return libsrt_neterrno(h);

  190.     return ret;

  191. }

  192. 

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

  194. 

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

  196. {

  197.     int ret;

  198.     int64_t wait_start = 0;

  199. 

  200.     while (1) {

  201.         if (ff_check_interrupt(int_cb))

  202.             return AVERROR_EXIT;

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

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

  205.             return ret;

  206.         if (timeout > 0) {

  207.             if (!wait_start)

  208.                 wait_start = av_gettime_relative();

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

  210.                 return AVERROR(ETIMEDOUT);

  211.         }

  212.     }

  213. }

  214. 

  215. static int libsrt_listen(int eid, int fd, const struct sockaddr *addr, socklen_t addrlen, URLContext *h, int64_t timeout)

  216. {

  217.     int ret;

  218.     int reuse = 1;

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

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

  221.     }

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

  223.     if (ret)

  224.         return libsrt_neterrno(h);

  225. 

  226.     ret = srt_listen(fd, 1);

  227.     if (ret)

  228.         return libsrt_neterrno(h);

  229. 

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

  231.     if (ret < 0)

  232.         return ret;

  233. 

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

  235.     if (ret < 0)

  236.         return libsrt_neterrno(h);

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

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

  239. 

  240.     return ret;

  241. }

  242. 

  243. 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)

  244. {

  245.     int ret;

  246. 

  247.     ret = srt_connect(fd, addr, addrlen);

  248.     if (ret < 0)

  249.         return libsrt_neterrno(h);

  250. 

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

  252.     if (ret < 0) {

  253.         if (will_try_next) {

  254.             av_log(h, AV_LOG_WARNING,

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

  256.                    h->filename, av_err2str(ret));

  257.         } else {

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

  259.                    h->filename, av_err2str(ret));

  260.         }

  261.     }

  262.     return ret;

  263. }

  264. 

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

  266. {

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

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

  269.         return AVERROR(EIO);

  270.     }

  271.     return 0;

  272. }

  273. 

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

  275. {

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

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

  278.         return AVERROR(EIO);

  279.     }

  280.     return 0;

  281. }

  282. 

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

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

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

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

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

  288. {

  289.     SRTContext *s = h->priv_data;

  290. 

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

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

  293.         return AVERROR(EIO);

  294.     }

  295.     return 0;

  296. }

  297. 

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

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

  300.      derived by accept-ed socket. */

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

  302. {

  303.     SRTContext *s = h->priv_data;

  304.     int yes = 1;

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

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

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

  308.     int connect_timeout = s->connect_timeout;

  309. 

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

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

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

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

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

  315. #if SRT_VERSION_VALUE >= 0x010302

  316. #if SRT_VERSION_VALUE >= 0x010401

  317.         (s->enforced_encryption >= 0 && libsrt_setsockopt(h, fd, SRTO_ENFORCEDENCRYPTION, "SRTO_ENFORCEDENCRYPTION", &s->enforced_encryption, sizeof(s->enforced_encryption)) < 0) ||

  318. #else

  319.         /* SRTO_STRICTENC == SRTO_ENFORCEDENCRYPTION (53), but for compatibility, we used SRTO_STRICTENC */

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

  321. #endif

  322.         (s->kmrefreshrate >= 0 && libsrt_setsockopt(h, fd, SRTO_KMREFRESHRATE, "SRTO_KMREFRESHRATE", &s->kmrefreshrate, sizeof(s->kmrefreshrate)) < 0) ||

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

  324. #endif

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  340. #if SRT_VERSION_VALUE >= 0x010401

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

  342. #else

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

  344. #endif

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

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

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

  348.         return AVERROR(EIO);

  349.     }

  350. 

  351.     if (s->linger >= 0) {

  352.         struct linger lin;

  353.         lin.l_linger = s->linger;

  354.         lin.l_onoff  = lin.l_linger > 0 ? 1 : 0;

  355.         if (libsrt_setsockopt(h, fd, SRTO_LINGER, "SRTO_LINGER", &lin, sizeof(lin)) < 0)

  356.             return AVERROR(EIO);

  357.     }

  358.     return 0;

  359. }

  360. 

  361. 

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

  363. {

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

  365.     int port, fd = -1;

  366.     SRTContext *s = h->priv_data;

  367.     const char *p;

  368.     char buf[256];

  369.     int ret;

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

  371.     char portstr[10];

  372.     int64_t open_timeout = 0;

  373.     int eid;

  374. 

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

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

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

  378.         return AVERROR(EINVAL);

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

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

  381.         return AVERROR(EINVAL);

  382.     }

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

  384.     if (p) {

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

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

  387.         }

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

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

  390.         }

  391.     }

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

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

  394.     }

  395.     hints.ai_family = AF_UNSPEC;

  396.     hints.ai_socktype = SOCK_DGRAM;

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

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

  399.         hints.ai_flags |= AI_PASSIVE;

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

  401.     if (ret) {

  402.         av_log(h, AV_LOG_ERROR,

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

  404.                hostname, gai_strerror(ret));

  405.         return AVERROR(EIO);

  406.     }

  407. 

  408.     cur_ai = ai;

  409. 

  410.     eid = srt_epoll_create();

  411.     if (eid < 0)

  412.         return libsrt_neterrno(h);

  413.     s->eid = eid;

  414. 

  415.  restart:

  416. 

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

  418.     if (fd < 0) {

  419.         ret = libsrt_neterrno(h);

  420.         goto fail;

  421.     }

  422. 

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

  424.         goto fail;

  425.     }

  426. 

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

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

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

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

  431.     }

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

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

  434.     }

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

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

  437. 

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

  439.         // multi-client

  440.         if ((ret = libsrt_listen(s->eid, fd, cur_ai->ai_addr, cur_ai->ai_addrlen, h, s->listen_timeout)) < 0)

  441.             goto fail1;

  442.         srt_close(fd);

  443.         fd = ret;

  444.     } else {

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

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

  447.             if (ret)

  448.                 goto fail1;

  449.         }

  450. 

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

  452.                                           open_timeout, h, !!cur_ai->ai_next)) < 0) {

  453.             if (ret == AVERROR_EXIT)

  454.                 goto fail1;

  455.             else

  456.                 goto fail;

  457.         }

  458.     }

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

  460.         goto fail;

  461.     }

  462. 

  463.     if (flags & AVIO_FLAG_WRITE) {

  464.         int packet_size = 0;

  465.         int optlen = sizeof(packet_size);

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

  467.         if (ret < 0)

  468.             goto fail1;

  469.         if (packet_size > 0)

  470.             h->max_packet_size = packet_size;

  471.     }

  472. 

  473.     h->is_streamed = 1;

  474.     s->fd = fd;

  475. 

  476.     freeaddrinfo(ai);

  477.     return 0;

  478. 

  479.  fail:

  480.     if (cur_ai->ai_next) {

  481.         /* Retry with the next sockaddr */

  482.         cur_ai = cur_ai->ai_next;

  483.         if (fd >= 0)

  484.             srt_close(fd);

  485.         ret = 0;

  486.         goto restart;

  487.     }

  488.  fail1:

  489.     if (fd >= 0)

  490.         srt_close(fd);

  491.     freeaddrinfo(ai);

  492.     srt_epoll_release(s->eid);

  493.     return ret;

  494. }

  495. 

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

  497. {

  498.     SRTContext *s = h->priv_data;

  499.     const char * p;

  500.     char buf[256];

  501.     int ret = 0;

  502. 

  503.     if (srt_startup() < 0) {

  504.         return AVERROR_UNKNOWN;

  505.     }

  506. 

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

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

  509.     if (p) {

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

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

  512.         }

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

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

  515.         }

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

  517.             av_freep(&s->passphrase);

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

  519.         }

  520. #if SRT_VERSION_VALUE >= 0x010302

  521.         if (av_find_info_tag(buf, sizeof(buf), "enforced_encryption", p)) {

  522.             s->enforced_encryption = strtol(buf, NULL, 10);

  523.         }

  524.         if (av_find_info_tag(buf, sizeof(buf), "kmrefreshrate", p)) {

  525.             s->kmrefreshrate = strtol(buf, NULL, 10);

  526.         }

  527.         if (av_find_info_tag(buf, sizeof(buf), "kmpreannounce", p)) {

  528.             s->kmpreannounce = strtol(buf, NULL, 10);

  529.         }

  530. #endif

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

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

  533.         }

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

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

  536.         }

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

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

  539.         }

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

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

  542.         }

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

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

  545.         }

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

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

  548.         }

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

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

  551.         }

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

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

  554.         }

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

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

  557.         }

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

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

  560.         }

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

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

  563.         }

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

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

  566.         }

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

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

  569.         }

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

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

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

  573.         }

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

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

  576.                 s->mode = SRT_MODE_CALLER;

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

  578.                 s->mode = SRT_MODE_LISTENER;

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

  580.                 s->mode = SRT_MODE_RENDEZVOUS;

  581.             } else {

  582.                 ret = AVERROR(EINVAL);

  583.                 goto err;

  584.             }

  585.         }

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

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

  588.         }

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

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

  591.         }

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

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

  594.         }

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

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

  597.         }

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

  599.             av_freep(&s->streamid);

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

  601.             if (!s->streamid) {

  602.                 ret = AVERROR(ENOMEM);

  603.                 goto err;

  604.             }

  605.         }

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

  607.             av_freep(&s->smoother);

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

  609.             if(!s->smoother) {

  610.                 ret = AVERROR(ENOMEM);

  611.                 goto err;

  612.             }

  613.         }

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

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

  616.         }

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

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

  619.                 s->transtype = SRTT_LIVE;

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

  621.                 s->transtype = SRTT_FILE;

  622.             } else {

  623.                 ret = AVERROR(EINVAL);

  624.                 goto err;

  625.             }

  626.         }

  627.         if (av_find_info_tag(buf, sizeof(buf), "linger", p)) {

  628.             s->linger = strtol(buf, NULL, 10);

  629.         }

  630.     }

  631.     ret = libsrt_setup(h, uri, flags);

  632.     if (ret < 0)

  633.         goto err;

  634.     return 0;

  635. 

  636. err:

  637.     av_freep(&s->smoother);

  638.     av_freep(&s->streamid);

  639.     srt_cleanup();

  640.     return ret;

  641. }

  642. 

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

  644. {

  645.     SRTContext *s = h->priv_data;

  646.     int ret;

  647. 

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

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

  650.         if (ret)

  651.             return ret;

  652.     }

  653. 

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

  655.     if (ret < 0) {

  656.         ret = libsrt_neterrno(h);

  657.     }

  658. 

  659.     return ret;

  660. }

  661. 

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

  663. {

  664.     SRTContext *s = h->priv_data;

  665.     int ret;

  666. 

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

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

  669.         if (ret)

  670.             return ret;

  671.     }

  672. 

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

  674.     if (ret < 0) {

  675.         ret = libsrt_neterrno(h);

  676.     }

  677. 

  678.     return ret;

  679. }

  680. 

  681. static int libsrt_close(URLContext *h)

  682. {

  683.     SRTContext *s = h->priv_data;

  684. 

  685.     srt_close(s->fd);

  686.     srt_epoll_release(s->eid);

  687. 

  688.     srt_cleanup();

  689. 

  690.     return 0;

  691. }

  692. 

  693. static int libsrt_get_file_handle(URLContext *h)

  694. {

  695.     SRTContext *s = h->priv_data;

  696.     return s->fd;

  697. }

  698. 

  699. static const AVClass libsrt_class = {

  700.     .class_name = "libsrt",

  701.     .item_name  = av_default_item_name,

  702.     .option     = libsrt_options,

  703.     .version    = LIBAVUTIL_VERSION_INT,

  704. };

  705. 

  706. const URLProtocol ff_libsrt_protocol = {

  707.     .name                = "srt",

  708.     .url_open            = libsrt_open,

  709.     .url_read            = libsrt_read,

  710.     .url_write           = libsrt_write,

  711.     .url_close           = libsrt_close,

  712.     .url_get_file_handle = libsrt_get_file_handle,

  713.     .priv_data_size      = sizeof(SRTContext),

  714.     .flags               = URL_PROTOCOL_FLAG_NETWORK,

  715.     .priv_data_class     = &libsrt_class,

  716. };