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 listen_fd;
57 int eid;
58 int64_t rw_timeout;
59 int64_t listen_timeout;
60 int recv_buffer_size;
61 int send_buffer_size;
62
63 int64_t maxbw;
64 int pbkeylen;
65 char *passphrase;
66 #if SRT_VERSION_VALUE >= 0x010302
67 int enforced_encryption;
68 int kmrefreshrate;
69 int kmpreannounce;
70 #endif
71 int mss;
72 int ffs;
73 int ipttl;
74 int iptos;
75 int64_t inputbw;
76 int oheadbw;
77 int64_t latency;
78 int tlpktdrop;
79 int nakreport;
80 int64_t connect_timeout;
81 int payload_size;
82 int64_t rcvlatency;
83 int64_t peerlatency;
84 enum SRTMode mode;
85 int sndbuf;
86 int rcvbuf;
87 int lossmaxttl;
88 int minversion;
89 char *streamid;
90 char *smoother;
91 int messageapi;
92 SRT_TRANSTYPE transtype;
93 int linger;
94 } SRTContext;
95
96 #define D AV_OPT_FLAG_DECODING_PARAM
97 #define E AV_OPT_FLAG_ENCODING_PARAM
98 #define OFFSET(x) offsetof(SRTContext, x)
99 static const AVOption libsrt_options[] = {
100 { "timeout", "Timeout of socket I/O operations (in microseconds)", OFFSET(rw_timeout), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
101 { "listen_timeout", "Connection awaiting timeout (in microseconds)" , OFFSET(listen_timeout), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
102 { "send_buffer_size", "Socket send buffer size (in bytes)", OFFSET(send_buffer_size), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
103 { "recv_buffer_size", "Socket receive buffer size (in bytes)", OFFSET(recv_buffer_size), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
104 { "pkt_size", "Maximum SRT packet size", OFFSET(payload_size), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, SRT_LIVE_MAX_PAYLOAD_SIZE, .flags = D|E, "payload_size" },
105 { "payload_size", "Maximum SRT packet size", OFFSET(payload_size), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, SRT_LIVE_MAX_PAYLOAD_SIZE, .flags = D|E, "payload_size" },
106 { "ts_size", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = SRT_LIVE_DEFAULT_PAYLOAD_SIZE }, INT_MIN, INT_MAX, .flags = D|E, "payload_size" },
107 { "max_size", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = SRT_LIVE_MAX_PAYLOAD_SIZE }, INT_MIN, INT_MAX, .flags = D|E, "payload_size" },
108 { "maxbw", "Maximum bandwidth (bytes per second) that the connection can use", OFFSET(maxbw), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
109 { "pbkeylen", "Crypto key len in bytes {16,24,32} Default: 16 (128-bit)", OFFSET(pbkeylen), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 32, .flags = D|E },
110 { "passphrase", "Crypto PBKDF2 Passphrase size[0,10..64] 0:disable crypto", OFFSET(passphrase), AV_OPT_TYPE_STRING, { .str = NULL }, .flags = D|E },
111 #if SRT_VERSION_VALUE >= 0x010302
112 { "enforced_encryption", "Enforces that both connection parties have the same passphrase set", OFFSET(enforced_encryption), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, .flags = D|E },
113 { "kmrefreshrate", "The number of packets to be transmitted after which the encryption key is switched to a new key", OFFSET(kmrefreshrate), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
114 { "kmpreannounce", "The interval between when a new encryption key is sent and when switchover occurs", OFFSET(kmpreannounce), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
115 #endif
116 { "mss", "The Maximum Segment Size", OFFSET(mss), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1500, .flags = D|E },
117 { "ffs", "Flight flag size (window size) (in bytes)", OFFSET(ffs), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
118 { "ipttl", "IP Time To Live", OFFSET(ipttl), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 255, .flags = D|E },
119 { "iptos", "IP Type of Service", OFFSET(iptos), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 255, .flags = D|E },
120 { "inputbw", "Estimated input stream rate", OFFSET(inputbw), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
121 { "oheadbw", "MaxBW ceiling based on % over input stream rate", OFFSET(oheadbw), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 100, .flags = D|E },
122 { "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 },
123 { "tsbpddelay", "deprecated, same effect as latency option", OFFSET(latency), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
124 { "rcvlatency", "receive latency (in microseconds)", OFFSET(rcvlatency), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
125 { "peerlatency", "peer latency (in microseconds)", OFFSET(peerlatency), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
126 { "tlpktdrop", "Enable receiver pkt drop", OFFSET(tlpktdrop), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, .flags = D|E },
127 { "nakreport", "Enable receiver to send periodic NAK reports", OFFSET(nakreport), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, .flags = D|E },
128 { "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 },
129 { "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" },
130 { "caller", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = SRT_MODE_CALLER }, INT_MIN, INT_MAX, .flags = D|E, "mode" },
131 { "listener", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = SRT_MODE_LISTENER }, INT_MIN, INT_MAX, .flags = D|E, "mode" },
132 { "rendezvous", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = SRT_MODE_RENDEZVOUS }, INT_MIN, INT_MAX, .flags = D|E, "mode" },
133 { "sndbuf", "Send buffer size (in bytes)", OFFSET(sndbuf), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
134 { "rcvbuf", "Receive buffer size (in bytes)", OFFSET(rcvbuf), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
135 { "lossmaxttl", "Maximum possible packet reorder tolerance", OFFSET(lossmaxttl), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
136 { "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 },
137 { "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 },
138 { "smoother", "The type of Smoother used for the transmission for that socket", OFFSET(smoother), AV_OPT_TYPE_STRING, { .str = NULL }, .flags = D|E },
139 { "messageapi", "Enable message API", OFFSET(messageapi), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, .flags = D|E },
140 { "transtype", "The transmission type for the socket", OFFSET(transtype), AV_OPT_TYPE_INT, { .i64 = SRTT_INVALID }, SRTT_LIVE, SRTT_INVALID, .flags = D|E, "transtype" },
141 { "live", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = SRTT_LIVE }, INT_MIN, INT_MAX, .flags = D|E, "transtype" },
142 { "file", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = SRTT_FILE }, INT_MIN, INT_MAX, .flags = D|E, "transtype" },
143 { "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 },
144 { NULL }
145 };
146
libsrt_neterrno(URLContext * h)147 static int libsrt_neterrno(URLContext *h)
148 {
149 int os_errno;
150 int err = srt_getlasterror(&os_errno);
151 if (err == SRT_EASYNCRCV || err == SRT_EASYNCSND)
152 return AVERROR(EAGAIN);
153 av_log(h, AV_LOG_ERROR, "%s\n", srt_getlasterror_str());
154 return os_errno ? AVERROR(os_errno) : AVERROR_UNKNOWN;
155 }
156
libsrt_socket_nonblock(int socket,int enable)157 static int libsrt_socket_nonblock(int socket, int enable)
158 {
159 int ret, blocking = enable ? 0 : 1;
160 /* Setting SRTO_{SND,RCV}SYN options to 1 enable blocking mode, setting them to 0 enable non-blocking mode. */
161 ret = srt_setsockopt(socket, 0, SRTO_SNDSYN, &blocking, sizeof(blocking));
162 if (ret < 0)
163 return ret;
164 return srt_setsockopt(socket, 0, SRTO_RCVSYN, &blocking, sizeof(blocking));
165 }
166
libsrt_network_wait_fd(URLContext * h,int eid,int fd,int write)167 static int libsrt_network_wait_fd(URLContext *h, int eid, int fd, int write)
168 {
169 int ret, len = 1, errlen = 1;
170 int modes = SRT_EPOLL_ERR | (write ? SRT_EPOLL_OUT : SRT_EPOLL_IN);
171 SRTSOCKET ready[1];
172 SRTSOCKET error[1];
173
174 if (srt_epoll_add_usock(eid, fd, &modes) < 0)
175 return libsrt_neterrno(h);
176 if (write) {
177 ret = srt_epoll_wait(eid, error, &errlen, ready, &len, POLLING_TIME, 0, 0, 0, 0);
178 } else {
179 ret = srt_epoll_wait(eid, ready, &len, error, &errlen, POLLING_TIME, 0, 0, 0, 0);
180 }
181 if (ret < 0) {
182 if (srt_getlasterror(NULL) == SRT_ETIMEOUT)
183 ret = AVERROR(EAGAIN);
184 else
185 ret = libsrt_neterrno(h);
186 } else {
187 ret = errlen ? AVERROR(EIO) : 0;
188 }
189 if (srt_epoll_remove_usock(eid, fd) < 0)
190 return libsrt_neterrno(h);
191 return ret;
192 }
193
194 /* TODO de-duplicate code from ff_network_wait_fd_timeout() */
195
libsrt_network_wait_fd_timeout(URLContext * h,int eid,int fd,int write,int64_t timeout,AVIOInterruptCB * int_cb)196 static int libsrt_network_wait_fd_timeout(URLContext *h, int eid, int fd, int write, int64_t timeout, AVIOInterruptCB *int_cb)
197 {
198 int ret;
199 int64_t wait_start = 0;
200
201 while (1) {
202 if (ff_check_interrupt(int_cb))
203 return AVERROR_EXIT;
204 ret = libsrt_network_wait_fd(h, eid, fd, write);
205 if (ret != AVERROR(EAGAIN))
206 return ret;
207 if (timeout > 0) {
208 if (!wait_start)
209 wait_start = av_gettime_relative();
210 else if (av_gettime_relative() - wait_start > timeout)
211 return AVERROR(ETIMEDOUT);
212 }
213 }
214 }
215
libsrt_listen(int eid,int fd,const struct sockaddr * addr,socklen_t addrlen,URLContext * h,int64_t timeout)216 static int libsrt_listen(int eid, int fd, const struct sockaddr *addr, socklen_t addrlen, URLContext *h, int64_t timeout)
217 {
218 int ret;
219 int reuse = 1;
220 if (srt_setsockopt(fd, SOL_SOCKET, SRTO_REUSEADDR, &reuse, sizeof(reuse))) {
221 av_log(h, AV_LOG_WARNING, "setsockopt(SRTO_REUSEADDR) failed\n");
222 }
223 ret = srt_bind(fd, addr, addrlen);
224 if (ret)
225 return libsrt_neterrno(h);
226
227 ret = srt_listen(fd, 1);
228 if (ret)
229 return libsrt_neterrno(h);
230
231 ret = libsrt_network_wait_fd_timeout(h, eid, fd, 1, timeout, &h->interrupt_callback);
232 if (ret < 0)
233 return ret;
234
235 ret = srt_accept(fd, NULL, NULL);
236 if (ret < 0)
237 return libsrt_neterrno(h);
238 if (libsrt_socket_nonblock(ret, 1) < 0)
239 av_log(h, AV_LOG_DEBUG, "libsrt_socket_nonblock failed\n");
240
241 return ret;
242 }
243
libsrt_listen_connect(int eid,int fd,const struct sockaddr * addr,socklen_t addrlen,int64_t timeout,URLContext * h,int will_try_next)244 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)
245 {
246 int ret;
247
248 ret = srt_connect(fd, addr, addrlen);
249 if (ret < 0)
250 return libsrt_neterrno(h);
251
252 ret = libsrt_network_wait_fd_timeout(h, eid, fd, 1, timeout, &h->interrupt_callback);
253 if (ret < 0) {
254 if (will_try_next) {
255 av_log(h, AV_LOG_WARNING,
256 "Connection to %s failed (%s), trying next address\n",
257 h->filename, av_err2str(ret));
258 } else {
259 av_log(h, AV_LOG_ERROR, "Connection to %s failed: %s\n",
260 h->filename, av_err2str(ret));
261 }
262 }
263 return ret;
264 }
265
libsrt_setsockopt(URLContext * h,int fd,SRT_SOCKOPT optname,const char * optnamestr,const void * optval,int optlen)266 static int libsrt_setsockopt(URLContext *h, int fd, SRT_SOCKOPT optname, const char * optnamestr, const void * optval, int optlen)
267 {
268 if (srt_setsockopt(fd, 0, optname, optval, optlen) < 0) {
269 av_log(h, AV_LOG_ERROR, "failed to set option %s on socket: %s\n", optnamestr, srt_getlasterror_str());
270 return AVERROR(EIO);
271 }
272 return 0;
273 }
274
libsrt_getsockopt(URLContext * h,int fd,SRT_SOCKOPT optname,const char * optnamestr,void * optval,int * optlen)275 static int libsrt_getsockopt(URLContext *h, int fd, SRT_SOCKOPT optname, const char * optnamestr, void * optval, int * optlen)
276 {
277 if (srt_getsockopt(fd, 0, optname, optval, optlen) < 0) {
278 av_log(h, AV_LOG_ERROR, "failed to get option %s on socket: %s\n", optnamestr, srt_getlasterror_str());
279 return AVERROR(EIO);
280 }
281 return 0;
282 }
283
284 /* - The "POST" options can be altered any time on a connected socket.
285 They MAY have also some meaning when set prior to connecting; such
286 option is SRTO_RCVSYN, which makes connect/accept call asynchronous.
287 Because of that this option is treated special way in this app. */
libsrt_set_options_post(URLContext * h,int fd)288 static int libsrt_set_options_post(URLContext *h, int fd)
289 {
290 SRTContext *s = h->priv_data;
291
292 if ((s->inputbw >= 0 && libsrt_setsockopt(h, fd, SRTO_INPUTBW, "SRTO_INPUTBW", &s->inputbw, sizeof(s->inputbw)) < 0) ||
293 (s->oheadbw >= 0 && libsrt_setsockopt(h, fd, SRTO_OHEADBW, "SRTO_OHEADBW", &s->oheadbw, sizeof(s->oheadbw)) < 0)) {
294 return AVERROR(EIO);
295 }
296 return 0;
297 }
298
299 /* - The "PRE" options must be set prior to connecting and can't be altered
300 on a connected socket, however if set on a listening socket, they are
301 derived by accept-ed socket. */
libsrt_set_options_pre(URLContext * h,int fd)302 static int libsrt_set_options_pre(URLContext *h, int fd)
303 {
304 SRTContext *s = h->priv_data;
305 int yes = 1;
306 int latency = s->latency / 1000;
307 int rcvlatency = s->rcvlatency / 1000;
308 int peerlatency = s->peerlatency / 1000;
309 int connect_timeout = s->connect_timeout;
310
311 if ((s->mode == SRT_MODE_RENDEZVOUS && libsrt_setsockopt(h, fd, SRTO_RENDEZVOUS, "SRTO_RENDEZVOUS", &yes, sizeof(yes)) < 0) ||
312 (s->transtype != SRTT_INVALID && libsrt_setsockopt(h, fd, SRTO_TRANSTYPE, "SRTO_TRANSTYPE", &s->transtype, sizeof(s->transtype)) < 0) ||
313 (s->maxbw >= 0 && libsrt_setsockopt(h, fd, SRTO_MAXBW, "SRTO_MAXBW", &s->maxbw, sizeof(s->maxbw)) < 0) ||
314 (s->pbkeylen >= 0 && libsrt_setsockopt(h, fd, SRTO_PBKEYLEN, "SRTO_PBKEYLEN", &s->pbkeylen, sizeof(s->pbkeylen)) < 0) ||
315 (s->passphrase && libsrt_setsockopt(h, fd, SRTO_PASSPHRASE, "SRTO_PASSPHRASE", s->passphrase, strlen(s->passphrase)) < 0) ||
316 #if SRT_VERSION_VALUE >= 0x010302
317 #if SRT_VERSION_VALUE >= 0x010401
318 (s->enforced_encryption >= 0 && libsrt_setsockopt(h, fd, SRTO_ENFORCEDENCRYPTION, "SRTO_ENFORCEDENCRYPTION", &s->enforced_encryption, sizeof(s->enforced_encryption)) < 0) ||
319 #else
320 /* SRTO_STRICTENC == SRTO_ENFORCEDENCRYPTION (53), but for compatibility, we used SRTO_STRICTENC */
321 (s->enforced_encryption >= 0 && libsrt_setsockopt(h, fd, SRTO_STRICTENC, "SRTO_STRICTENC", &s->enforced_encryption, sizeof(s->enforced_encryption)) < 0) ||
322 #endif
323 (s->kmrefreshrate >= 0 && libsrt_setsockopt(h, fd, SRTO_KMREFRESHRATE, "SRTO_KMREFRESHRATE", &s->kmrefreshrate, sizeof(s->kmrefreshrate)) < 0) ||
324 (s->kmpreannounce >= 0 && libsrt_setsockopt(h, fd, SRTO_KMPREANNOUNCE, "SRTO_KMPREANNOUNCE", &s->kmpreannounce, sizeof(s->kmpreannounce)) < 0) ||
325 #endif
326 (s->mss >= 0 && libsrt_setsockopt(h, fd, SRTO_MSS, "SRTO_MSS", &s->mss, sizeof(s->mss)) < 0) ||
327 (s->ffs >= 0 && libsrt_setsockopt(h, fd, SRTO_FC, "SRTO_FC", &s->ffs, sizeof(s->ffs)) < 0) ||
328 (s->ipttl >= 0 && libsrt_setsockopt(h, fd, SRTO_IPTTL, "SRTO_IPTTL", &s->ipttl, sizeof(s->ipttl)) < 0) ||
329 (s->iptos >= 0 && libsrt_setsockopt(h, fd, SRTO_IPTOS, "SRTO_IPTOS", &s->iptos, sizeof(s->iptos)) < 0) ||
330 (s->latency >= 0 && libsrt_setsockopt(h, fd, SRTO_LATENCY, "SRTO_LATENCY", &latency, sizeof(latency)) < 0) ||
331 (s->rcvlatency >= 0 && libsrt_setsockopt(h, fd, SRTO_RCVLATENCY, "SRTO_RCVLATENCY", &rcvlatency, sizeof(rcvlatency)) < 0) ||
332 (s->peerlatency >= 0 && libsrt_setsockopt(h, fd, SRTO_PEERLATENCY, "SRTO_PEERLATENCY", &peerlatency, sizeof(peerlatency)) < 0) ||
333 (s->tlpktdrop >= 0 && libsrt_setsockopt(h, fd, SRTO_TLPKTDROP, "SRTO_TLPKDROP", &s->tlpktdrop, sizeof(s->tlpktdrop)) < 0) ||
334 (s->nakreport >= 0 && libsrt_setsockopt(h, fd, SRTO_NAKREPORT, "SRTO_NAKREPORT", &s->nakreport, sizeof(s->nakreport)) < 0) ||
335 (connect_timeout >= 0 && libsrt_setsockopt(h, fd, SRTO_CONNTIMEO, "SRTO_CONNTIMEO", &connect_timeout, sizeof(connect_timeout)) <0 ) ||
336 (s->sndbuf >= 0 && libsrt_setsockopt(h, fd, SRTO_SNDBUF, "SRTO_SNDBUF", &s->sndbuf, sizeof(s->sndbuf)) < 0) ||
337 (s->rcvbuf >= 0 && libsrt_setsockopt(h, fd, SRTO_RCVBUF, "SRTO_RCVBUF", &s->rcvbuf, sizeof(s->rcvbuf)) < 0) ||
338 (s->lossmaxttl >= 0 && libsrt_setsockopt(h, fd, SRTO_LOSSMAXTTL, "SRTO_LOSSMAXTTL", &s->lossmaxttl, sizeof(s->lossmaxttl)) < 0) ||
339 (s->minversion >= 0 && libsrt_setsockopt(h, fd, SRTO_MINVERSION, "SRTO_MINVERSION", &s->minversion, sizeof(s->minversion)) < 0) ||
340 (s->streamid && libsrt_setsockopt(h, fd, SRTO_STREAMID, "SRTO_STREAMID", s->streamid, strlen(s->streamid)) < 0) ||
341 #if SRT_VERSION_VALUE >= 0x010401
342 (s->smoother && libsrt_setsockopt(h, fd, SRTO_CONGESTION, "SRTO_CONGESTION", s->smoother, strlen(s->smoother)) < 0) ||
343 #else
344 (s->smoother && libsrt_setsockopt(h, fd, SRTO_SMOOTHER, "SRTO_SMOOTHER", s->smoother, strlen(s->smoother)) < 0) ||
345 #endif
346 (s->messageapi >= 0 && libsrt_setsockopt(h, fd, SRTO_MESSAGEAPI, "SRTO_MESSAGEAPI", &s->messageapi, sizeof(s->messageapi)) < 0) ||
347 (s->payload_size >= 0 && libsrt_setsockopt(h, fd, SRTO_PAYLOADSIZE, "SRTO_PAYLOADSIZE", &s->payload_size, sizeof(s->payload_size)) < 0) ||
348 ((h->flags & AVIO_FLAG_WRITE) && libsrt_setsockopt(h, fd, SRTO_SENDER, "SRTO_SENDER", &yes, sizeof(yes)) < 0)) {
349 return AVERROR(EIO);
350 }
351
352 if (s->linger >= 0) {
353 struct linger lin;
354 lin.l_linger = s->linger;
355 lin.l_onoff = lin.l_linger > 0 ? 1 : 0;
356 if (libsrt_setsockopt(h, fd, SRTO_LINGER, "SRTO_LINGER", &lin, sizeof(lin)) < 0)
357 return AVERROR(EIO);
358 }
359 return 0;
360 }
361
362
libsrt_setup(URLContext * h,const char * uri,int flags)363 static int libsrt_setup(URLContext *h, const char *uri, int flags)
364 {
365 struct addrinfo hints = { 0 }, *ai, *cur_ai;
366 int port, fd = -1, listen_fd = -1;
367 SRTContext *s = h->priv_data;
368 const char *p;
369 char buf[256];
370 int ret;
371 char hostname[1024],proto[1024],path[1024];
372 char portstr[10];
373 int64_t open_timeout = 0;
374 int eid;
375
376 av_url_split(proto, sizeof(proto), NULL, 0, hostname, sizeof(hostname),
377 &port, path, sizeof(path), uri);
378 if (strcmp(proto, "srt"))
379 return AVERROR(EINVAL);
380 if (port <= 0 || port >= 65536) {
381 av_log(h, AV_LOG_ERROR, "Port missing in uri\n");
382 return AVERROR(EINVAL);
383 }
384 p = strchr(uri, '?');
385 if (p) {
386 if (av_find_info_tag(buf, sizeof(buf), "timeout", p)) {
387 s->rw_timeout = strtol(buf, NULL, 10);
388 }
389 if (av_find_info_tag(buf, sizeof(buf), "listen_timeout", p)) {
390 s->listen_timeout = strtol(buf, NULL, 10);
391 }
392 }
393 if (s->rw_timeout >= 0) {
394 open_timeout = h->rw_timeout = s->rw_timeout;
395 }
396 hints.ai_family = AF_UNSPEC;
397 hints.ai_socktype = SOCK_DGRAM;
398 snprintf(portstr, sizeof(portstr), "%d", port);
399 if (s->mode == SRT_MODE_LISTENER)
400 hints.ai_flags |= AI_PASSIVE;
401 ret = getaddrinfo(hostname[0] ? hostname : NULL, portstr, &hints, &ai);
402 if (ret) {
403 av_log(h, AV_LOG_ERROR,
404 "Failed to resolve hostname %s: %s\n",
405 hostname, gai_strerror(ret));
406 return AVERROR(EIO);
407 }
408
409 cur_ai = ai;
410
411 eid = srt_epoll_create();
412 if (eid < 0)
413 return libsrt_neterrno(h);
414 s->eid = eid;
415
416 restart:
417
418 fd = srt_socket(cur_ai->ai_family, cur_ai->ai_socktype, 0);
419 if (fd < 0) {
420 ret = libsrt_neterrno(h);
421 goto fail;
422 }
423
424 if ((ret = libsrt_set_options_pre(h, fd)) < 0) {
425 goto fail;
426 }
427
428 /* Set the socket's send or receive buffer sizes, if specified.
429 If unspecified or setting fails, system default is used. */
430 if (s->recv_buffer_size > 0) {
431 srt_setsockopt(fd, SOL_SOCKET, SRTO_UDP_RCVBUF, &s->recv_buffer_size, sizeof (s->recv_buffer_size));
432 }
433 if (s->send_buffer_size > 0) {
434 srt_setsockopt(fd, SOL_SOCKET, SRTO_UDP_SNDBUF, &s->send_buffer_size, sizeof (s->send_buffer_size));
435 }
436 if (libsrt_socket_nonblock(fd, 1) < 0)
437 av_log(h, AV_LOG_DEBUG, "libsrt_socket_nonblock failed\n");
438
439 if (s->mode == SRT_MODE_LISTENER) {
440 // multi-client
441 if ((ret = libsrt_listen(s->eid, fd, cur_ai->ai_addr, cur_ai->ai_addrlen, h, s->listen_timeout)) < 0)
442 goto fail1;
443 listen_fd = fd;
444 fd = ret;
445 } else {
446 if (s->mode == SRT_MODE_RENDEZVOUS) {
447 ret = srt_bind(fd, cur_ai->ai_addr, cur_ai->ai_addrlen);
448 if (ret)
449 goto fail1;
450 }
451
452 if ((ret = libsrt_listen_connect(s->eid, fd, cur_ai->ai_addr, cur_ai->ai_addrlen,
453 open_timeout, h, !!cur_ai->ai_next)) < 0) {
454 if (ret == AVERROR_EXIT)
455 goto fail1;
456 else
457 goto fail;
458 }
459 }
460 if ((ret = libsrt_set_options_post(h, fd)) < 0) {
461 goto fail;
462 }
463
464 if (flags & AVIO_FLAG_WRITE) {
465 int packet_size = 0;
466 int optlen = sizeof(packet_size);
467 ret = libsrt_getsockopt(h, fd, SRTO_PAYLOADSIZE, "SRTO_PAYLOADSIZE", &packet_size, &optlen);
468 if (ret < 0)
469 goto fail1;
470 if (packet_size > 0)
471 h->max_packet_size = packet_size;
472 }
473
474 h->is_streamed = 1;
475 s->fd = fd;
476 s->listen_fd = listen_fd;
477
478 freeaddrinfo(ai);
479 return 0;
480
481 fail:
482 if (cur_ai->ai_next) {
483 /* Retry with the next sockaddr */
484 cur_ai = cur_ai->ai_next;
485 if (fd >= 0)
486 srt_close(fd);
487 if (listen_fd >= 0)
488 srt_close(listen_fd);
489 ret = 0;
490 goto restart;
491 }
492 fail1:
493 if (fd >= 0)
494 srt_close(fd);
495 if (listen_fd >= 0)
496 srt_close(listen_fd);
497 freeaddrinfo(ai);
498 srt_epoll_release(s->eid);
499 return ret;
500 }
501
libsrt_open(URLContext * h,const char * uri,int flags)502 static int libsrt_open(URLContext *h, const char *uri, int flags)
503 {
504 SRTContext *s = h->priv_data;
505 const char * p;
506 char buf[256];
507 int ret = 0;
508
509 if (srt_startup() < 0) {
510 return AVERROR_UNKNOWN;
511 }
512
513 /* SRT options (srt/srt.h) */
514 p = strchr(uri, '?');
515 if (p) {
516 if (av_find_info_tag(buf, sizeof(buf), "maxbw", p)) {
517 s->maxbw = strtoll(buf, NULL, 0);
518 }
519 if (av_find_info_tag(buf, sizeof(buf), "pbkeylen", p)) {
520 s->pbkeylen = strtol(buf, NULL, 10);
521 }
522 if (av_find_info_tag(buf, sizeof(buf), "passphrase", p)) {
523 av_freep(&s->passphrase);
524 s->passphrase = av_strndup(buf, strlen(buf));
525 }
526 #if SRT_VERSION_VALUE >= 0x010302
527 if (av_find_info_tag(buf, sizeof(buf), "enforced_encryption", p)) {
528 s->enforced_encryption = strtol(buf, NULL, 10);
529 }
530 if (av_find_info_tag(buf, sizeof(buf), "kmrefreshrate", p)) {
531 s->kmrefreshrate = strtol(buf, NULL, 10);
532 }
533 if (av_find_info_tag(buf, sizeof(buf), "kmpreannounce", p)) {
534 s->kmpreannounce = strtol(buf, NULL, 10);
535 }
536 #endif
537 if (av_find_info_tag(buf, sizeof(buf), "mss", p)) {
538 s->mss = strtol(buf, NULL, 10);
539 }
540 if (av_find_info_tag(buf, sizeof(buf), "ffs", p)) {
541 s->ffs = strtol(buf, NULL, 10);
542 }
543 if (av_find_info_tag(buf, sizeof(buf), "ipttl", p)) {
544 s->ipttl = strtol(buf, NULL, 10);
545 }
546 if (av_find_info_tag(buf, sizeof(buf), "iptos", p)) {
547 s->iptos = strtol(buf, NULL, 10);
548 }
549 if (av_find_info_tag(buf, sizeof(buf), "inputbw", p)) {
550 s->inputbw = strtoll(buf, NULL, 10);
551 }
552 if (av_find_info_tag(buf, sizeof(buf), "oheadbw", p)) {
553 s->oheadbw = strtoll(buf, NULL, 10);
554 }
555 if (av_find_info_tag(buf, sizeof(buf), "latency", p)) {
556 s->latency = strtol(buf, NULL, 10);
557 }
558 if (av_find_info_tag(buf, sizeof(buf), "tsbpddelay", p)) {
559 s->latency = strtol(buf, NULL, 10);
560 }
561 if (av_find_info_tag(buf, sizeof(buf), "rcvlatency", p)) {
562 s->rcvlatency = strtol(buf, NULL, 10);
563 }
564 if (av_find_info_tag(buf, sizeof(buf), "peerlatency", p)) {
565 s->peerlatency = strtol(buf, NULL, 10);
566 }
567 if (av_find_info_tag(buf, sizeof(buf), "tlpktdrop", p)) {
568 s->tlpktdrop = strtol(buf, NULL, 10);
569 }
570 if (av_find_info_tag(buf, sizeof(buf), "nakreport", p)) {
571 s->nakreport = strtol(buf, NULL, 10);
572 }
573 if (av_find_info_tag(buf, sizeof(buf), "connect_timeout", p)) {
574 s->connect_timeout = strtol(buf, NULL, 10);
575 }
576 if (av_find_info_tag(buf, sizeof(buf), "payload_size", p) ||
577 av_find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
578 s->payload_size = strtol(buf, NULL, 10);
579 }
580 if (av_find_info_tag(buf, sizeof(buf), "mode", p)) {
581 if (!strcmp(buf, "caller")) {
582 s->mode = SRT_MODE_CALLER;
583 } else if (!strcmp(buf, "listener")) {
584 s->mode = SRT_MODE_LISTENER;
585 } else if (!strcmp(buf, "rendezvous")) {
586 s->mode = SRT_MODE_RENDEZVOUS;
587 } else {
588 ret = AVERROR(EINVAL);
589 goto err;
590 }
591 }
592 if (av_find_info_tag(buf, sizeof(buf), "sndbuf", p)) {
593 s->sndbuf = strtol(buf, NULL, 10);
594 }
595 if (av_find_info_tag(buf, sizeof(buf), "rcvbuf", p)) {
596 s->rcvbuf = strtol(buf, NULL, 10);
597 }
598 if (av_find_info_tag(buf, sizeof(buf), "lossmaxttl", p)) {
599 s->lossmaxttl = strtol(buf, NULL, 10);
600 }
601 if (av_find_info_tag(buf, sizeof(buf), "minversion", p)) {
602 s->minversion = strtol(buf, NULL, 0);
603 }
604 if (av_find_info_tag(buf, sizeof(buf), "streamid", p)) {
605 av_freep(&s->streamid);
606 s->streamid = av_strdup(buf);
607 if (!s->streamid) {
608 ret = AVERROR(ENOMEM);
609 goto err;
610 }
611 }
612 if (av_find_info_tag(buf, sizeof(buf), "smoother", p)) {
613 av_freep(&s->smoother);
614 s->smoother = av_strdup(buf);
615 if(!s->smoother) {
616 ret = AVERROR(ENOMEM);
617 goto err;
618 }
619 }
620 if (av_find_info_tag(buf, sizeof(buf), "messageapi", p)) {
621 s->messageapi = strtol(buf, NULL, 10);
622 }
623 if (av_find_info_tag(buf, sizeof(buf), "transtype", p)) {
624 if (!strcmp(buf, "live")) {
625 s->transtype = SRTT_LIVE;
626 } else if (!strcmp(buf, "file")) {
627 s->transtype = SRTT_FILE;
628 } else {
629 ret = AVERROR(EINVAL);
630 goto err;
631 }
632 }
633 if (av_find_info_tag(buf, sizeof(buf), "linger", p)) {
634 s->linger = strtol(buf, NULL, 10);
635 }
636 }
637 ret = libsrt_setup(h, uri, flags);
638 if (ret < 0)
639 goto err;
640 return 0;
641
642 err:
643 av_freep(&s->smoother);
644 av_freep(&s->streamid);
645 srt_cleanup();
646 return ret;
647 }
648
libsrt_read(URLContext * h,uint8_t * buf,int size)649 static int libsrt_read(URLContext *h, uint8_t *buf, int size)
650 {
651 SRTContext *s = h->priv_data;
652 int ret;
653
654 if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
655 ret = libsrt_network_wait_fd_timeout(h, s->eid, s->fd, 0, h->rw_timeout, &h->interrupt_callback);
656 if (ret)
657 return ret;
658 }
659
660 ret = srt_recvmsg(s->fd, buf, size);
661 if (ret < 0) {
662 ret = libsrt_neterrno(h);
663 }
664
665 return ret;
666 }
667
libsrt_write(URLContext * h,const uint8_t * buf,int size)668 static int libsrt_write(URLContext *h, const uint8_t *buf, int size)
669 {
670 SRTContext *s = h->priv_data;
671 int ret;
672
673 if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
674 ret = libsrt_network_wait_fd_timeout(h, s->eid, s->fd, 1, h->rw_timeout, &h->interrupt_callback);
675 if (ret)
676 return ret;
677 }
678
679 ret = srt_sendmsg(s->fd, buf, size, -1, 0);
680 if (ret < 0) {
681 ret = libsrt_neterrno(h);
682 }
683
684 return ret;
685 }
686
libsrt_close(URLContext * h)687 static int libsrt_close(URLContext *h)
688 {
689 SRTContext *s = h->priv_data;
690
691 srt_close(s->fd);
692
693 if (s->listen_fd >= 0)
694 srt_close(s->listen_fd);
695
696 srt_epoll_release(s->eid);
697
698 srt_cleanup();
699
700 return 0;
701 }
702
libsrt_get_file_handle(URLContext * h)703 static int libsrt_get_file_handle(URLContext *h)
704 {
705 SRTContext *s = h->priv_data;
706 return s->fd;
707 }
708
709 static const AVClass libsrt_class = {
710 .class_name = "libsrt",
711 .item_name = av_default_item_name,
712 .option = libsrt_options,
713 .version = LIBAVUTIL_VERSION_INT,
714 };
715
716 const URLProtocol ff_libsrt_protocol = {
717 .name = "srt",
718 .url_open = libsrt_open,
719 .url_read = libsrt_read,
720 .url_write = libsrt_write,
721 .url_close = libsrt_close,
722 .url_get_file_handle = libsrt_get_file_handle,
723 .priv_data_size = sizeof(SRTContext),
724 .flags = URL_PROTOCOL_FLAG_NETWORK,
725 .priv_data_class = &libsrt_class,
726 };
727