FFmpeg  4.3
libsrt.c
Go to the documentation of this file.
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 {
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;
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;
81  int64_t rcvlatency;
82  int64_t peerlatency;
83  enum SRTMode mode;
84  int sndbuf;
85  int rcvbuf;
88  char *streamid;
89  char *smoother;
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 
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) {
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. */
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. */
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;
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  /* SRTO_STRICTENC == SRTO_ENFORCEDENCRYPTION (53), but for compatibility, we used SRTO_STRICTENC */
317  (s->enforced_encryption >= 0 && libsrt_setsockopt(h, fd, SRTO_STRICTENC, "SRTO_STRICTENC", &s->enforced_encryption, sizeof(s->enforced_encryption)) < 0) ||
318  (s->kmrefreshrate >= 0 && libsrt_setsockopt(h, fd, SRTO_KMREFRESHRATE, "SRTO_KMREFRESHRATE", &s->kmrefreshrate, sizeof(s->kmrefreshrate)) < 0) ||
319  (s->kmpreannounce >= 0 && libsrt_setsockopt(h, fd, SRTO_KMPREANNOUNCE, "SRTO_KMPREANNOUNCE", &s->kmpreannounce, sizeof(s->kmpreannounce)) < 0) ||
320 #endif
321  (s->mss >= 0 && libsrt_setsockopt(h, fd, SRTO_MSS, "SRTO_MSS", &s->mss, sizeof(s->mss)) < 0) ||
322  (s->ffs >= 0 && libsrt_setsockopt(h, fd, SRTO_FC, "SRTO_FC", &s->ffs, sizeof(s->ffs)) < 0) ||
323  (s->ipttl >= 0 && libsrt_setsockopt(h, fd, SRTO_IPTTL, "SRTO_IPTTL", &s->ipttl, sizeof(s->ipttl)) < 0) ||
324  (s->iptos >= 0 && libsrt_setsockopt(h, fd, SRTO_IPTOS, "SRTO_IPTOS", &s->iptos, sizeof(s->iptos)) < 0) ||
325  (s->latency >= 0 && libsrt_setsockopt(h, fd, SRTO_LATENCY, "SRTO_LATENCY", &latency, sizeof(latency)) < 0) ||
326  (s->rcvlatency >= 0 && libsrt_setsockopt(h, fd, SRTO_RCVLATENCY, "SRTO_RCVLATENCY", &rcvlatency, sizeof(rcvlatency)) < 0) ||
327  (s->peerlatency >= 0 && libsrt_setsockopt(h, fd, SRTO_PEERLATENCY, "SRTO_PEERLATENCY", &peerlatency, sizeof(peerlatency)) < 0) ||
328  (s->tlpktdrop >= 0 && libsrt_setsockopt(h, fd, SRTO_TLPKTDROP, "SRTO_TLPKDROP", &s->tlpktdrop, sizeof(s->tlpktdrop)) < 0) ||
329  (s->nakreport >= 0 && libsrt_setsockopt(h, fd, SRTO_NAKREPORT, "SRTO_NAKREPORT", &s->nakreport, sizeof(s->nakreport)) < 0) ||
330  (connect_timeout >= 0 && libsrt_setsockopt(h, fd, SRTO_CONNTIMEO, "SRTO_CONNTIMEO", &connect_timeout, sizeof(connect_timeout)) <0 ) ||
331  (s->sndbuf >= 0 && libsrt_setsockopt(h, fd, SRTO_SNDBUF, "SRTO_SNDBUF", &s->sndbuf, sizeof(s->sndbuf)) < 0) ||
332  (s->rcvbuf >= 0 && libsrt_setsockopt(h, fd, SRTO_RCVBUF, "SRTO_RCVBUF", &s->rcvbuf, sizeof(s->rcvbuf)) < 0) ||
333  (s->lossmaxttl >= 0 && libsrt_setsockopt(h, fd, SRTO_LOSSMAXTTL, "SRTO_LOSSMAXTTL", &s->lossmaxttl, sizeof(s->lossmaxttl)) < 0) ||
334  (s->minversion >= 0 && libsrt_setsockopt(h, fd, SRTO_MINVERSION, "SRTO_MINVERSION", &s->minversion, sizeof(s->minversion)) < 0) ||
335  (s->streamid && libsrt_setsockopt(h, fd, SRTO_STREAMID, "SRTO_STREAMID", s->streamid, strlen(s->streamid)) < 0) ||
336  (s->smoother && libsrt_setsockopt(h, fd, SRTO_SMOOTHER, "SRTO_SMOOTHER", s->smoother, strlen(s->smoother)) < 0) ||
337  (s->messageapi >= 0 && libsrt_setsockopt(h, fd, SRTO_MESSAGEAPI, "SRTO_MESSAGEAPI", &s->messageapi, sizeof(s->messageapi)) < 0) ||
338  (s->payload_size >= 0 && libsrt_setsockopt(h, fd, SRTO_PAYLOADSIZE, "SRTO_PAYLOADSIZE", &s->payload_size, sizeof(s->payload_size)) < 0) ||
339  ((h->flags & AVIO_FLAG_WRITE) && libsrt_setsockopt(h, fd, SRTO_SENDER, "SRTO_SENDER", &yes, sizeof(yes)) < 0)) {
340  return AVERROR(EIO);
341  }
342 
343  if (s->linger >= 0) {
344  struct linger lin;
345  lin.l_linger = s->linger;
346  lin.l_onoff = lin.l_linger > 0 ? 1 : 0;
347  if (libsrt_setsockopt(h, fd, SRTO_LINGER, "SRTO_LINGER", &lin, sizeof(lin)) < 0)
348  return AVERROR(EIO);
349  }
350  return 0;
351 }
352 
353 
354 static int libsrt_setup(URLContext *h, const char *uri, int flags)
355 {
356  struct addrinfo hints = { 0 }, *ai, *cur_ai;
357  int port, fd = -1;
358  SRTContext *s = h->priv_data;
359  const char *p;
360  char buf[256];
361  int ret;
362  char hostname[1024],proto[1024],path[1024];
363  char portstr[10];
364  int64_t open_timeout = 0;
365  int eid;
366 
367  eid = srt_epoll_create();
368  if (eid < 0)
369  return libsrt_neterrno(h);
370  s->eid = eid;
371 
372  av_url_split(proto, sizeof(proto), NULL, 0, hostname, sizeof(hostname),
373  &port, path, sizeof(path), uri);
374  if (strcmp(proto, "srt"))
375  return AVERROR(EINVAL);
376  if (port <= 0 || port >= 65536) {
377  av_log(h, AV_LOG_ERROR, "Port missing in uri\n");
378  return AVERROR(EINVAL);
379  }
380  p = strchr(uri, '?');
381  if (p) {
382  if (av_find_info_tag(buf, sizeof(buf), "timeout", p)) {
383  s->rw_timeout = strtol(buf, NULL, 10);
384  }
385  if (av_find_info_tag(buf, sizeof(buf), "listen_timeout", p)) {
386  s->listen_timeout = strtol(buf, NULL, 10);
387  }
388  }
389  if (s->rw_timeout >= 0) {
390  open_timeout = h->rw_timeout = s->rw_timeout;
391  }
392  hints.ai_family = AF_UNSPEC;
393  hints.ai_socktype = SOCK_DGRAM;
394  snprintf(portstr, sizeof(portstr), "%d", port);
395  if (s->mode == SRT_MODE_LISTENER)
396  hints.ai_flags |= AI_PASSIVE;
397  ret = getaddrinfo(hostname[0] ? hostname : NULL, portstr, &hints, &ai);
398  if (ret) {
399  av_log(h, AV_LOG_ERROR,
400  "Failed to resolve hostname %s: %s\n",
401  hostname, gai_strerror(ret));
402  return AVERROR(EIO);
403  }
404 
405  cur_ai = ai;
406 
407  restart:
408 
409  fd = srt_socket(cur_ai->ai_family, cur_ai->ai_socktype, 0);
410  if (fd < 0) {
411  ret = libsrt_neterrno(h);
412  goto fail;
413  }
414 
415  if ((ret = libsrt_set_options_pre(h, fd)) < 0) {
416  goto fail;
417  }
418 
419  /* Set the socket's send or receive buffer sizes, if specified.
420  If unspecified or setting fails, system default is used. */
421  if (s->recv_buffer_size > 0) {
422  srt_setsockopt(fd, SOL_SOCKET, SRTO_UDP_RCVBUF, &s->recv_buffer_size, sizeof (s->recv_buffer_size));
423  }
424  if (s->send_buffer_size > 0) {
425  srt_setsockopt(fd, SOL_SOCKET, SRTO_UDP_SNDBUF, &s->send_buffer_size, sizeof (s->send_buffer_size));
426  }
427  if (libsrt_socket_nonblock(fd, 1) < 0)
428  av_log(h, AV_LOG_DEBUG, "libsrt_socket_nonblock failed\n");
429 
430  if (s->mode == SRT_MODE_LISTENER) {
431  // multi-client
432  if ((ret = libsrt_listen(s->eid, fd, cur_ai->ai_addr, cur_ai->ai_addrlen, h, s->listen_timeout)) < 0)
433  goto fail1;
434  fd = ret;
435  } else {
436  if (s->mode == SRT_MODE_RENDEZVOUS) {
437  ret = srt_bind(fd, cur_ai->ai_addr, cur_ai->ai_addrlen);
438  if (ret)
439  goto fail1;
440  }
441 
442  if ((ret = libsrt_listen_connect(s->eid, fd, cur_ai->ai_addr, cur_ai->ai_addrlen,
443  open_timeout, h, !!cur_ai->ai_next)) < 0) {
444  if (ret == AVERROR_EXIT)
445  goto fail1;
446  else
447  goto fail;
448  }
449  }
450  if ((ret = libsrt_set_options_post(h, fd)) < 0) {
451  goto fail;
452  }
453 
454  if (flags & AVIO_FLAG_WRITE) {
455  int packet_size = 0;
456  int optlen = sizeof(packet_size);
457  ret = libsrt_getsockopt(h, fd, SRTO_PAYLOADSIZE, "SRTO_PAYLOADSIZE", &packet_size, &optlen);
458  if (ret < 0)
459  goto fail1;
460  if (packet_size > 0)
461  h->max_packet_size = packet_size;
462  }
463 
464  h->is_streamed = 1;
465  s->fd = fd;
466 
467  freeaddrinfo(ai);
468  return 0;
469 
470  fail:
471  if (cur_ai->ai_next) {
472  /* Retry with the next sockaddr */
473  cur_ai = cur_ai->ai_next;
474  if (fd >= 0)
475  srt_close(fd);
476  ret = 0;
477  goto restart;
478  }
479  fail1:
480  if (fd >= 0)
481  srt_close(fd);
482  freeaddrinfo(ai);
483  return ret;
484 }
485 
486 static int libsrt_open(URLContext *h, const char *uri, int flags)
487 {
488  SRTContext *s = h->priv_data;
489  const char * p;
490  char buf[256];
491  int ret = 0;
492 
493  if (srt_startup() < 0) {
494  return AVERROR_UNKNOWN;
495  }
496 
497  /* SRT options (srt/srt.h) */
498  p = strchr(uri, '?');
499  if (p) {
500  if (av_find_info_tag(buf, sizeof(buf), "maxbw", p)) {
501  s->maxbw = strtoll(buf, NULL, 0);
502  }
503  if (av_find_info_tag(buf, sizeof(buf), "pbkeylen", p)) {
504  s->pbkeylen = strtol(buf, NULL, 10);
505  }
506  if (av_find_info_tag(buf, sizeof(buf), "passphrase", p)) {
507  av_freep(&s->passphrase);
508  s->passphrase = av_strndup(buf, strlen(buf));
509  }
510 #if SRT_VERSION_VALUE >= 0x010302
511  if (av_find_info_tag(buf, sizeof(buf), "enforced_encryption", p)) {
512  s->enforced_encryption = strtol(buf, NULL, 10);
513  }
514  if (av_find_info_tag(buf, sizeof(buf), "kmrefreshrate", p)) {
515  s->kmrefreshrate = strtol(buf, NULL, 10);
516  }
517  if (av_find_info_tag(buf, sizeof(buf), "kmpreannounce", p)) {
518  s->kmpreannounce = strtol(buf, NULL, 10);
519  }
520 #endif
521  if (av_find_info_tag(buf, sizeof(buf), "mss", p)) {
522  s->mss = strtol(buf, NULL, 10);
523  }
524  if (av_find_info_tag(buf, sizeof(buf), "ffs", p)) {
525  s->ffs = strtol(buf, NULL, 10);
526  }
527  if (av_find_info_tag(buf, sizeof(buf), "ipttl", p)) {
528  s->ipttl = strtol(buf, NULL, 10);
529  }
530  if (av_find_info_tag(buf, sizeof(buf), "iptos", p)) {
531  s->iptos = strtol(buf, NULL, 10);
532  }
533  if (av_find_info_tag(buf, sizeof(buf), "inputbw", p)) {
534  s->inputbw = strtoll(buf, NULL, 10);
535  }
536  if (av_find_info_tag(buf, sizeof(buf), "oheadbw", p)) {
537  s->oheadbw = strtoll(buf, NULL, 10);
538  }
539  if (av_find_info_tag(buf, sizeof(buf), "latency", p)) {
540  s->latency = strtol(buf, NULL, 10);
541  }
542  if (av_find_info_tag(buf, sizeof(buf), "tsbpddelay", p)) {
543  s->latency = strtol(buf, NULL, 10);
544  }
545  if (av_find_info_tag(buf, sizeof(buf), "rcvlatency", p)) {
546  s->rcvlatency = strtol(buf, NULL, 10);
547  }
548  if (av_find_info_tag(buf, sizeof(buf), "peerlatency", p)) {
549  s->peerlatency = strtol(buf, NULL, 10);
550  }
551  if (av_find_info_tag(buf, sizeof(buf), "tlpktdrop", p)) {
552  s->tlpktdrop = strtol(buf, NULL, 10);
553  }
554  if (av_find_info_tag(buf, sizeof(buf), "nakreport", p)) {
555  s->nakreport = strtol(buf, NULL, 10);
556  }
557  if (av_find_info_tag(buf, sizeof(buf), "connect_timeout", p)) {
558  s->connect_timeout = strtol(buf, NULL, 10);
559  }
560  if (av_find_info_tag(buf, sizeof(buf), "payload_size", p) ||
561  av_find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
562  s->payload_size = strtol(buf, NULL, 10);
563  }
564  if (av_find_info_tag(buf, sizeof(buf), "mode", p)) {
565  if (!strcmp(buf, "caller")) {
566  s->mode = SRT_MODE_CALLER;
567  } else if (!strcmp(buf, "listener")) {
568  s->mode = SRT_MODE_LISTENER;
569  } else if (!strcmp(buf, "rendezvous")) {
571  } else {
572  return AVERROR(EIO);
573  }
574  }
575  if (av_find_info_tag(buf, sizeof(buf), "sndbuf", p)) {
576  s->sndbuf = strtol(buf, NULL, 10);
577  }
578  if (av_find_info_tag(buf, sizeof(buf), "rcvbuf", p)) {
579  s->rcvbuf = strtol(buf, NULL, 10);
580  }
581  if (av_find_info_tag(buf, sizeof(buf), "lossmaxttl", p)) {
582  s->lossmaxttl = strtol(buf, NULL, 10);
583  }
584  if (av_find_info_tag(buf, sizeof(buf), "minversion", p)) {
585  s->minversion = strtol(buf, NULL, 0);
586  }
587  if (av_find_info_tag(buf, sizeof(buf), "streamid", p)) {
588  av_freep(&s->streamid);
589  s->streamid = av_strdup(buf);
590  if (!s->streamid) {
591  ret = AVERROR(ENOMEM);
592  goto err;
593  }
594  }
595  if (av_find_info_tag(buf, sizeof(buf), "smoother", p)) {
596  av_freep(&s->smoother);
597  s->smoother = av_strdup(buf);
598  if(!s->smoother) {
599  ret = AVERROR(ENOMEM);
600  goto err;
601  }
602  }
603  if (av_find_info_tag(buf, sizeof(buf), "messageapi", p)) {
604  s->messageapi = strtol(buf, NULL, 10);
605  }
606  if (av_find_info_tag(buf, sizeof(buf), "transtype", p)) {
607  if (!strcmp(buf, "live")) {
608  s->transtype = SRTT_LIVE;
609  } else if (!strcmp(buf, "file")) {
610  s->transtype = SRTT_FILE;
611  } else {
612  ret = AVERROR(EINVAL);
613  goto err;
614  }
615  }
616  if (av_find_info_tag(buf, sizeof(buf), "linger", p)) {
617  s->linger = strtol(buf, NULL, 10);
618  }
619  }
620  return libsrt_setup(h, uri, flags);
621 err:
622  av_freep(&s->smoother);
623  av_freep(&s->streamid);
624  return ret;
625 }
626 
627 static int libsrt_read(URLContext *h, uint8_t *buf, int size)
628 {
629  SRTContext *s = h->priv_data;
630  int ret;
631 
632  if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
634  if (ret)
635  return ret;
636  }
637 
638  ret = srt_recvmsg(s->fd, buf, size);
639  if (ret < 0) {
640  ret = libsrt_neterrno(h);
641  }
642 
643  return ret;
644 }
645 
646 static int libsrt_write(URLContext *h, const uint8_t *buf, int size)
647 {
648  SRTContext *s = h->priv_data;
649  int ret;
650 
651  if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
653  if (ret)
654  return ret;
655  }
656 
657  ret = srt_sendmsg(s->fd, buf, size, -1, 0);
658  if (ret < 0) {
659  ret = libsrt_neterrno(h);
660  }
661 
662  return ret;
663 }
664 
666 {
667  SRTContext *s = h->priv_data;
668 
669  srt_close(s->fd);
670 
671  srt_epoll_release(s->eid);
672 
673  srt_cleanup();
674 
675  return 0;
676 }
677 
679 {
680  SRTContext *s = h->priv_data;
681  return s->fd;
682 }
683 
684 static const AVClass libsrt_class = {
685  .class_name = "libsrt",
686  .item_name = av_default_item_name,
687  .option = libsrt_options,
688  .version = LIBAVUTIL_VERSION_INT,
689 };
690 
692  .name = "srt",
693  .url_open = libsrt_open,
694  .url_read = libsrt_read,
695  .url_write = libsrt_write,
696  .url_close = libsrt_close,
697  .url_get_file_handle = libsrt_get_file_handle,
698  .priv_data_size = sizeof(SRTContext),
700  .priv_data_class = &libsrt_class,
701 };
void av_url_split(char *proto, int proto_size, char *authorization, int authorization_size, char *hostname, int hostname_size, int *port_ptr, char *path, int path_size, const char *url)
Split a URL string into components.
Definition: utils.c:4792
#define NULL
Definition: coverity.c:32
int size
#define URL_PROTOCOL_FLAG_NETWORK
Definition: url.h:34
static int libsrt_listen(int eid, int fd, const struct sockaddr *addr, socklen_t addrlen, URLContext *h, int64_t timeout)
Definition: libsrt.c:215
AVOption.
Definition: opt.h:246
static int libsrt_open(URLContext *h, const char *uri, int flags)
Definition: libsrt.c:486
int tlpktdrop
Definition: libsrt.c:77
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
#define D
Definition: libsrt.c:95
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
int recv_buffer_size
Definition: libsrt.c:59
int is_streamed
true if streamed (no seek possible), default = false
Definition: url.h:45
int rcvbuf
Definition: libsrt.c:85
AVIOInterruptCB interrupt_callback
Definition: url.h:47
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)
Definition: libsrt.c:243
int64_t listen_timeout
Definition: libsrt.c:58
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
int64_t rw_timeout
maximum time to wait for (network) read/write operation completion, in mcs
Definition: url.h:48
int64_t latency
Definition: libsrt.c:76
#define AVIO_FLAG_WRITE
write-only
Definition: avio.h:675
#define AI_PASSIVE
Definition: network.h:179
SRT_TRANSTYPE transtype
Definition: libsrt.c:91
int flags
Definition: url.h:43
#define freeaddrinfo
Definition: network.h:218
static void error(const char *err)
char * streamid
Definition: libsrt.c:88
static int libsrt_setsockopt(URLContext *h, int fd, SRT_SOCKOPT optname, const char *optnamestr, const void *optval, int optlen)
Definition: libsrt.c:265
static int libsrt_socket_nonblock(int socket, int enable)
Definition: libsrt.c:156
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
int minversion
Definition: libsrt.c:87
uint8_t
AVOptions.
miscellaneous OS support macros and functions.
int nakreport
Definition: libsrt.c:78
int64_t inputbw
Definition: libsrt.c:74
char * passphrase
Definition: libsrt.c:64
int eid
Definition: libsrt.c:56
static int libsrt_getsockopt(URLContext *h, int fd, SRT_SOCKOPT optname, const char *optnamestr, void *optval, int *optlen)
Definition: libsrt.c:274
int av_find_info_tag(char *arg, int arg_size, const char *tag1, const char *info)
Attempt to find a specific tag in a URL.
Definition: parseutils.c:749
#define av_log(a,...)
Callback for checking whether to abort blocking functions.
Definition: avio.h:58
int lossmaxttl
Definition: libsrt.c:86
int oheadbw
Definition: libsrt.c:75
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
static const AVClass libsrt_class
Definition: libsrt.c:684
static int libsrt_setup(URLContext *h, const char *uri, int flags)
Definition: libsrt.c:354
const AVIOInterruptCB int_cb
Definition: ffmpeg.c:489
#define AVERROR(e)
Definition: error.h:43
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
static int libsrt_set_options_post(URLContext *h, int fd)
Definition: libsrt.c:287
simple assert() macros that are a bit more flexible than ISO C assert().
int pbkeylen
Definition: libsrt.c:63
#define fail()
Definition: checkasm.h:123
static int libsrt_network_wait_fd(URLContext *h, int eid, int fd, int write)
Definition: libsrt.c:166
#define SRT_LIVE_MAX_PAYLOAD_SIZE
Definition: libsrt.c:44
int fd
Definition: libsrt.c:55
static int libsrt_read(URLContext *h, uint8_t *buf, int size)
Definition: libsrt.c:627
char * smoother
Definition: libsrt.c:89
int messageapi
Definition: libsrt.c:90
static int libsrt_network_wait_fd_timeout(URLContext *h, int eid, int fd, int write, int64_t timeout, AVIOInterruptCB *int_cb)
Definition: libsrt.c:195
#define av_err2str(errnum)
Convenience macro, the return value should be used only directly in function arguments but never stan...
Definition: error.h:119
#define SRT_LIVE_DEFAULT_PAYLOAD_SIZE
Definition: libsrt.c:39
enum SRTMode mode
Definition: libsrt.c:83
#define s(width, name)
Definition: cbs_vp9.c:257
static int libsrt_get_file_handle(URLContext *h)
Definition: libsrt.c:678
int64_t peerlatency
Definition: libsrt.c:82
int64_t maxbw
Definition: libsrt.c:62
#define AVERROR_EXIT
Immediate exit was requested; the called function should not be restarted.
Definition: error.h:56
static const AVOption libsrt_options[]
Definition: libsrt.c:98
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:255
int payload_size
Definition: libsrt.c:80
int ff_check_interrupt(AVIOInterruptCB *cb)
Check if the user has requested to interrupt a blocking function associated with cb.
Definition: avio.c:663
#define AVIO_FLAG_NONBLOCK
Use non-blocking mode.
Definition: avio.h:693
int iptos
Definition: libsrt.c:73
Definition: url.h:38
const URLProtocol ff_libsrt_protocol
Definition: libsrt.c:691
Describe the class of an AVClass context structure.
Definition: log.h:67
void * priv_data
Definition: url.h:41
#define gai_strerror
Definition: network.h:225
#define snprintf
Definition: snprintf.h:34
misc parsing utilities
#define POLLING_TIME
Definition: network.h:249
const char * name
Definition: url.h:55
int ai_socktype
Definition: network.h:140
int64_t av_gettime_relative(void)
Get the current time in microseconds since some unspecified starting point.
Definition: time.c:56
#define flags(name, subs,...)
Definition: cbs_av1.c:564
int ipttl
Definition: libsrt.c:72
int64_t connect_timeout
Definition: libsrt.c:79
#define getaddrinfo
Definition: network.h:217
Main libavformat public API header.
int64_t rw_timeout
Definition: libsrt.c:57
int sndbuf
Definition: libsrt.c:84
int ffs
Definition: libsrt.c:71
char * filename
specified URL
Definition: url.h:42
#define OFFSET(x)
Definition: libsrt.c:97
#define AVERROR_UNKNOWN
Unknown error, typically from an external library.
Definition: error.h:71
int send_buffer_size
Definition: libsrt.c:60
#define E
Definition: libsrt.c:96
static const SiprModeParam modes[MODE_COUNT]
Definition: sipr.c:69
static int libsrt_write(URLContext *h, const uint8_t *buf, int size)
Definition: libsrt.c:646
int64_t rcvlatency
Definition: libsrt.c:81
int len
int mss
Definition: libsrt.c:70
static int libsrt_close(URLContext *h)
Definition: libsrt.c:665
SRTMode
Definition: libsrt.c:47
int ai_flags
Definition: network.h:138
int max_packet_size
if non zero, the stream is packetized with this max packet size
Definition: url.h:44
#define av_freep(p)
unbuffered private I/O API
int linger
Definition: libsrt.c:92
mode
Use these values in ebur128_init (or&#39;ed).
Definition: ebur128.h:83
char * av_strndup(const char *s, size_t len)
Duplicate a substring of a string.
Definition: mem.c:267
static int libsrt_set_options_pre(URLContext *h, int fd)
Definition: libsrt.c:301
static int libsrt_neterrno(URLContext *h)
Definition: libsrt.c:146
int ai_family
Definition: network.h:139