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 too-late 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
libsrt_neterrno(URLContext * h)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
libsrt_socket_nonblock(int socket,int enable)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
libsrt_epoll_create(URLContext * h,int fd,int write)166 static int libsrt_epoll_create(URLContext *h, int fd, int write)
167 {
168 int modes = SRT_EPOLL_ERR | (write ? SRT_EPOLL_OUT : SRT_EPOLL_IN);
169 int eid = srt_epoll_create();
170 if (eid < 0)
171 return libsrt_neterrno(h);
172 if (srt_epoll_add_usock(eid, fd, &modes) < 0) {
173 srt_epoll_release(eid);
174 return libsrt_neterrno(h);
175 }
176 return eid;
177 }
178
libsrt_network_wait_fd(URLContext * h,int eid,int write)179 static int libsrt_network_wait_fd(URLContext *h, int eid, int write)
180 {
181 int ret, len = 1, errlen = 1;
182 SRTSOCKET ready[1];
183 SRTSOCKET error[1];
184
185 if (write) {
186 ret = srt_epoll_wait(eid, error, &errlen, ready, &len, POLLING_TIME, 0, 0, 0, 0);
187 } else {
188 ret = srt_epoll_wait(eid, ready, &len, error, &errlen, POLLING_TIME, 0, 0, 0, 0);
189 }
190 if (ret < 0) {
191 if (srt_getlasterror(NULL) == SRT_ETIMEOUT)
192 ret = AVERROR(EAGAIN);
193 else
194 ret = libsrt_neterrno(h);
195 } else {
196 ret = errlen ? AVERROR(EIO) : 0;
197 }
198 return ret;
199 }
200
201 /* TODO de-duplicate code from ff_network_wait_fd_timeout() */
202
libsrt_network_wait_fd_timeout(URLContext * h,int eid,int write,int64_t timeout,AVIOInterruptCB * int_cb)203 static int libsrt_network_wait_fd_timeout(URLContext *h, int eid, int write, int64_t timeout, AVIOInterruptCB *int_cb)
204 {
205 int ret;
206 int64_t wait_start = 0;
207
208 while (1) {
209 if (ff_check_interrupt(int_cb))
210 return AVERROR_EXIT;
211 ret = libsrt_network_wait_fd(h, eid, write);
212 if (ret != AVERROR(EAGAIN))
213 return ret;
214 if (timeout > 0) {
215 if (!wait_start)
216 wait_start = av_gettime_relative();
217 else if (av_gettime_relative() - wait_start > timeout)
218 return AVERROR(ETIMEDOUT);
219 }
220 }
221 }
222
libsrt_listen(int eid,int fd,const struct sockaddr * addr,socklen_t addrlen,URLContext * h,int64_t timeout)223 static int libsrt_listen(int eid, int fd, const struct sockaddr *addr, socklen_t addrlen, URLContext *h, int64_t timeout)
224 {
225 int ret;
226 int reuse = 1;
227 if (srt_setsockopt(fd, SOL_SOCKET, SRTO_REUSEADDR, &reuse, sizeof(reuse))) {
228 av_log(h, AV_LOG_WARNING, "setsockopt(SRTO_REUSEADDR) failed\n");
229 }
230 if (srt_bind(fd, addr, addrlen))
231 return libsrt_neterrno(h);
232
233 if (srt_listen(fd, 1))
234 return libsrt_neterrno(h);
235
236 ret = libsrt_network_wait_fd_timeout(h, eid, 1, timeout, &h->interrupt_callback);
237 if (ret < 0)
238 return ret;
239
240 ret = srt_accept(fd, NULL, NULL);
241 if (ret < 0)
242 return libsrt_neterrno(h);
243 if (libsrt_socket_nonblock(ret, 1) < 0)
244 av_log(h, AV_LOG_DEBUG, "libsrt_socket_nonblock failed\n");
245
246 return ret;
247 }
248
libsrt_listen_connect(int eid,int fd,const struct sockaddr * addr,socklen_t addrlen,int64_t timeout,URLContext * h,int will_try_next)249 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)
250 {
251 int ret;
252
253 if (srt_connect(fd, addr, addrlen) < 0)
254 return libsrt_neterrno(h);
255
256 ret = libsrt_network_wait_fd_timeout(h, eid, 1, timeout, &h->interrupt_callback);
257 if (ret < 0) {
258 if (will_try_next) {
259 av_log(h, AV_LOG_WARNING,
260 "Connection to %s failed (%s), trying next address\n",
261 h->filename, av_err2str(ret));
262 } else {
263 av_log(h, AV_LOG_ERROR, "Connection to %s failed: %s\n",
264 h->filename, av_err2str(ret));
265 }
266 }
267 return ret;
268 }
269
libsrt_setsockopt(URLContext * h,int fd,SRT_SOCKOPT optname,const char * optnamestr,const void * optval,int optlen)270 static int libsrt_setsockopt(URLContext *h, int fd, SRT_SOCKOPT optname, const char * optnamestr, const void * optval, int optlen)
271 {
272 if (srt_setsockopt(fd, 0, optname, optval, optlen) < 0) {
273 av_log(h, AV_LOG_ERROR, "failed to set option %s on socket: %s\n", optnamestr, srt_getlasterror_str());
274 return AVERROR(EIO);
275 }
276 return 0;
277 }
278
libsrt_getsockopt(URLContext * h,int fd,SRT_SOCKOPT optname,const char * optnamestr,void * optval,int * optlen)279 static int libsrt_getsockopt(URLContext *h, int fd, SRT_SOCKOPT optname, const char * optnamestr, void * optval, int * optlen)
280 {
281 if (srt_getsockopt(fd, 0, optname, optval, optlen) < 0) {
282 av_log(h, AV_LOG_ERROR, "failed to get option %s on socket: %s\n", optnamestr, srt_getlasterror_str());
283 return AVERROR(EIO);
284 }
285 return 0;
286 }
287
288 /* - The "POST" options can be altered any time on a connected socket.
289 They MAY have also some meaning when set prior to connecting; such
290 option is SRTO_RCVSYN, which makes connect/accept call asynchronous.
291 Because of that this option is treated special way in this app. */
libsrt_set_options_post(URLContext * h,int fd)292 static int libsrt_set_options_post(URLContext *h, int fd)
293 {
294 SRTContext *s = h->priv_data;
295
296 if ((s->inputbw >= 0 && libsrt_setsockopt(h, fd, SRTO_INPUTBW, "SRTO_INPUTBW", &s->inputbw, sizeof(s->inputbw)) < 0) ||
297 (s->oheadbw >= 0 && libsrt_setsockopt(h, fd, SRTO_OHEADBW, "SRTO_OHEADBW", &s->oheadbw, sizeof(s->oheadbw)) < 0)) {
298 return AVERROR(EIO);
299 }
300 return 0;
301 }
302
303 /* - The "PRE" options must be set prior to connecting and can't be altered
304 on a connected socket, however if set on a listening socket, they are
305 derived by accept-ed socket. */
libsrt_set_options_pre(URLContext * h,int fd)306 static int libsrt_set_options_pre(URLContext *h, int fd)
307 {
308 SRTContext *s = h->priv_data;
309 int yes = 1;
310 int latency = s->latency / 1000;
311 int rcvlatency = s->rcvlatency / 1000;
312 int peerlatency = s->peerlatency / 1000;
313 int connect_timeout = s->connect_timeout;
314
315 if ((s->mode == SRT_MODE_RENDEZVOUS && libsrt_setsockopt(h, fd, SRTO_RENDEZVOUS, "SRTO_RENDEZVOUS", &yes, sizeof(yes)) < 0) ||
316 (s->transtype != SRTT_INVALID && libsrt_setsockopt(h, fd, SRTO_TRANSTYPE, "SRTO_TRANSTYPE", &s->transtype, sizeof(s->transtype)) < 0) ||
317 (s->maxbw >= 0 && libsrt_setsockopt(h, fd, SRTO_MAXBW, "SRTO_MAXBW", &s->maxbw, sizeof(s->maxbw)) < 0) ||
318 (s->pbkeylen >= 0 && libsrt_setsockopt(h, fd, SRTO_PBKEYLEN, "SRTO_PBKEYLEN", &s->pbkeylen, sizeof(s->pbkeylen)) < 0) ||
319 (s->passphrase && libsrt_setsockopt(h, fd, SRTO_PASSPHRASE, "SRTO_PASSPHRASE", s->passphrase, strlen(s->passphrase)) < 0) ||
320 #if SRT_VERSION_VALUE >= 0x010302
321 #if SRT_VERSION_VALUE >= 0x010401
322 (s->enforced_encryption >= 0 && libsrt_setsockopt(h, fd, SRTO_ENFORCEDENCRYPTION, "SRTO_ENFORCEDENCRYPTION", &s->enforced_encryption, sizeof(s->enforced_encryption)) < 0) ||
323 #else
324 /* SRTO_STRICTENC == SRTO_ENFORCEDENCRYPTION (53), but for compatibility, we used SRTO_STRICTENC */
325 (s->enforced_encryption >= 0 && libsrt_setsockopt(h, fd, SRTO_STRICTENC, "SRTO_STRICTENC", &s->enforced_encryption, sizeof(s->enforced_encryption)) < 0) ||
326 #endif
327 (s->kmrefreshrate >= 0 && libsrt_setsockopt(h, fd, SRTO_KMREFRESHRATE, "SRTO_KMREFRESHRATE", &s->kmrefreshrate, sizeof(s->kmrefreshrate)) < 0) ||
328 (s->kmpreannounce >= 0 && libsrt_setsockopt(h, fd, SRTO_KMPREANNOUNCE, "SRTO_KMPREANNOUNCE", &s->kmpreannounce, sizeof(s->kmpreannounce)) < 0) ||
329 #endif
330 (s->mss >= 0 && libsrt_setsockopt(h, fd, SRTO_MSS, "SRTO_MSS", &s->mss, sizeof(s->mss)) < 0) ||
331 (s->ffs >= 0 && libsrt_setsockopt(h, fd, SRTO_FC, "SRTO_FC", &s->ffs, sizeof(s->ffs)) < 0) ||
332 (s->ipttl >= 0 && libsrt_setsockopt(h, fd, SRTO_IPTTL, "SRTO_IPTTL", &s->ipttl, sizeof(s->ipttl)) < 0) ||
333 (s->iptos >= 0 && libsrt_setsockopt(h, fd, SRTO_IPTOS, "SRTO_IPTOS", &s->iptos, sizeof(s->iptos)) < 0) ||
334 (s->latency >= 0 && libsrt_setsockopt(h, fd, SRTO_LATENCY, "SRTO_LATENCY", &latency, sizeof(latency)) < 0) ||
335 (s->rcvlatency >= 0 && libsrt_setsockopt(h, fd, SRTO_RCVLATENCY, "SRTO_RCVLATENCY", &rcvlatency, sizeof(rcvlatency)) < 0) ||
336 (s->peerlatency >= 0 && libsrt_setsockopt(h, fd, SRTO_PEERLATENCY, "SRTO_PEERLATENCY", &peerlatency, sizeof(peerlatency)) < 0) ||
337 (s->tlpktdrop >= 0 && libsrt_setsockopt(h, fd, SRTO_TLPKTDROP, "SRTO_TLPKTDROP", &s->tlpktdrop, sizeof(s->tlpktdrop)) < 0) ||
338 (s->nakreport >= 0 && libsrt_setsockopt(h, fd, SRTO_NAKREPORT, "SRTO_NAKREPORT", &s->nakreport, sizeof(s->nakreport)) < 0) ||
339 (connect_timeout >= 0 && libsrt_setsockopt(h, fd, SRTO_CONNTIMEO, "SRTO_CONNTIMEO", &connect_timeout, sizeof(connect_timeout)) <0 ) ||
340 (s->sndbuf >= 0 && libsrt_setsockopt(h, fd, SRTO_SNDBUF, "SRTO_SNDBUF", &s->sndbuf, sizeof(s->sndbuf)) < 0) ||
341 (s->rcvbuf >= 0 && libsrt_setsockopt(h, fd, SRTO_RCVBUF, "SRTO_RCVBUF", &s->rcvbuf, sizeof(s->rcvbuf)) < 0) ||
342 (s->lossmaxttl >= 0 && libsrt_setsockopt(h, fd, SRTO_LOSSMAXTTL, "SRTO_LOSSMAXTTL", &s->lossmaxttl, sizeof(s->lossmaxttl)) < 0) ||
343 (s->minversion >= 0 && libsrt_setsockopt(h, fd, SRTO_MINVERSION, "SRTO_MINVERSION", &s->minversion, sizeof(s->minversion)) < 0) ||
344 (s->streamid && libsrt_setsockopt(h, fd, SRTO_STREAMID, "SRTO_STREAMID", s->streamid, strlen(s->streamid)) < 0) ||
345 #if SRT_VERSION_VALUE >= 0x010401
346 (s->smoother && libsrt_setsockopt(h, fd, SRTO_CONGESTION, "SRTO_CONGESTION", s->smoother, strlen(s->smoother)) < 0) ||
347 #else
348 (s->smoother && libsrt_setsockopt(h, fd, SRTO_SMOOTHER, "SRTO_SMOOTHER", s->smoother, strlen(s->smoother)) < 0) ||
349 #endif
350 (s->messageapi >= 0 && libsrt_setsockopt(h, fd, SRTO_MESSAGEAPI, "SRTO_MESSAGEAPI", &s->messageapi, sizeof(s->messageapi)) < 0) ||
351 (s->payload_size >= 0 && libsrt_setsockopt(h, fd, SRTO_PAYLOADSIZE, "SRTO_PAYLOADSIZE", &s->payload_size, sizeof(s->payload_size)) < 0) ||
352 ((h->flags & AVIO_FLAG_WRITE) && libsrt_setsockopt(h, fd, SRTO_SENDER, "SRTO_SENDER", &yes, sizeof(yes)) < 0)) {
353 return AVERROR(EIO);
354 }
355
356 if (s->linger >= 0) {
357 struct linger lin;
358 lin.l_linger = s->linger;
359 lin.l_onoff = lin.l_linger > 0 ? 1 : 0;
360 if (libsrt_setsockopt(h, fd, SRTO_LINGER, "SRTO_LINGER", &lin, sizeof(lin)) < 0)
361 return AVERROR(EIO);
362 }
363 return 0;
364 }
365
366
libsrt_setup(URLContext * h,const char * uri,int flags)367 static int libsrt_setup(URLContext *h, const char *uri, int flags)
368 {
369 struct addrinfo hints = { 0 }, *ai, *cur_ai;
370 int port, fd;
371 SRTContext *s = h->priv_data;
372 const char *p;
373 char buf[256];
374 int ret;
375 char hostname[1024],proto[1024],path[1024];
376 char portstr[10];
377 int64_t open_timeout = 0;
378 int eid, write_eid;
379
380 av_url_split(proto, sizeof(proto), NULL, 0, hostname, sizeof(hostname),
381 &port, path, sizeof(path), uri);
382 if (strcmp(proto, "srt"))
383 return AVERROR(EINVAL);
384 if (port <= 0 || port >= 65536) {
385 av_log(h, AV_LOG_ERROR, "Port missing in uri\n");
386 return AVERROR(EINVAL);
387 }
388 p = strchr(uri, '?');
389 if (p) {
390 if (av_find_info_tag(buf, sizeof(buf), "timeout", p)) {
391 s->rw_timeout = strtol(buf, NULL, 10);
392 }
393 if (av_find_info_tag(buf, sizeof(buf), "listen_timeout", p)) {
394 s->listen_timeout = strtol(buf, NULL, 10);
395 }
396 }
397 if (s->rw_timeout >= 0) {
398 open_timeout = h->rw_timeout = s->rw_timeout;
399 }
400 hints.ai_family = AF_UNSPEC;
401 hints.ai_socktype = SOCK_DGRAM;
402 snprintf(portstr, sizeof(portstr), "%d", port);
403 if (s->mode == SRT_MODE_LISTENER)
404 hints.ai_flags |= AI_PASSIVE;
405 ret = getaddrinfo(hostname[0] ? hostname : NULL, portstr, &hints, &ai);
406 if (ret) {
407 av_log(h, AV_LOG_ERROR,
408 "Failed to resolve hostname %s: %s\n",
409 hostname, gai_strerror(ret));
410 return AVERROR(EIO);
411 }
412
413 cur_ai = ai;
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 ret = write_eid = libsrt_epoll_create(h, fd, 1);
439 if (ret < 0)
440 goto fail1;
441 if (s->mode == SRT_MODE_LISTENER) {
442 // multi-client
443 ret = libsrt_listen(write_eid, fd, cur_ai->ai_addr, cur_ai->ai_addrlen, h, s->listen_timeout);
444 srt_epoll_release(write_eid);
445 if (ret < 0)
446 goto fail1;
447 srt_close(fd);
448 fd = ret;
449 } else {
450 if (s->mode == SRT_MODE_RENDEZVOUS) {
451 if (srt_bind(fd, cur_ai->ai_addr, cur_ai->ai_addrlen)) {
452 ret = libsrt_neterrno(h);
453 srt_epoll_release(write_eid);
454 goto fail1;
455 }
456 }
457
458 ret = libsrt_listen_connect(write_eid, fd, cur_ai->ai_addr, cur_ai->ai_addrlen,
459 open_timeout, h, !!cur_ai->ai_next);
460 srt_epoll_release(write_eid);
461 if (ret < 0) {
462 if (ret == AVERROR_EXIT)
463 goto fail1;
464 else
465 goto fail;
466 }
467 }
468 if ((ret = libsrt_set_options_post(h, fd)) < 0) {
469 goto fail;
470 }
471
472 if (flags & AVIO_FLAG_WRITE) {
473 int packet_size = 0;
474 int optlen = sizeof(packet_size);
475 ret = libsrt_getsockopt(h, fd, SRTO_PAYLOADSIZE, "SRTO_PAYLOADSIZE", &packet_size, &optlen);
476 if (ret < 0)
477 goto fail1;
478 if (packet_size > 0)
479 h->max_packet_size = packet_size;
480 }
481
482 ret = eid = libsrt_epoll_create(h, fd, flags & AVIO_FLAG_WRITE);
483 if (eid < 0)
484 goto fail1;
485
486 h->is_streamed = 1;
487 s->fd = fd;
488 s->eid = eid;
489
490 freeaddrinfo(ai);
491 return 0;
492
493 fail:
494 if (cur_ai->ai_next) {
495 /* Retry with the next sockaddr */
496 cur_ai = cur_ai->ai_next;
497 if (fd >= 0)
498 srt_close(fd);
499 ret = 0;
500 goto restart;
501 }
502 fail1:
503 if (fd >= 0)
504 srt_close(fd);
505 freeaddrinfo(ai);
506 return ret;
507 }
508
libsrt_open(URLContext * h,const char * uri,int flags)509 static int libsrt_open(URLContext *h, const char *uri, int flags)
510 {
511 SRTContext *s = h->priv_data;
512 const char * p;
513 char buf[256];
514 int ret = 0;
515
516 if (srt_startup() < 0) {
517 return AVERROR_UNKNOWN;
518 }
519
520 /* SRT options (srt/srt.h) */
521 p = strchr(uri, '?');
522 if (p) {
523 if (av_find_info_tag(buf, sizeof(buf), "maxbw", p)) {
524 s->maxbw = strtoll(buf, NULL, 0);
525 }
526 if (av_find_info_tag(buf, sizeof(buf), "pbkeylen", p)) {
527 s->pbkeylen = strtol(buf, NULL, 10);
528 }
529 if (av_find_info_tag(buf, sizeof(buf), "passphrase", p)) {
530 av_freep(&s->passphrase);
531 s->passphrase = av_strndup(buf, strlen(buf));
532 }
533 #if SRT_VERSION_VALUE >= 0x010302
534 if (av_find_info_tag(buf, sizeof(buf), "enforced_encryption", p)) {
535 s->enforced_encryption = strtol(buf, NULL, 10);
536 }
537 if (av_find_info_tag(buf, sizeof(buf), "kmrefreshrate", p)) {
538 s->kmrefreshrate = strtol(buf, NULL, 10);
539 }
540 if (av_find_info_tag(buf, sizeof(buf), "kmpreannounce", p)) {
541 s->kmpreannounce = strtol(buf, NULL, 10);
542 }
543 #endif
544 if (av_find_info_tag(buf, sizeof(buf), "mss", p)) {
545 s->mss = strtol(buf, NULL, 10);
546 }
547 if (av_find_info_tag(buf, sizeof(buf), "ffs", p)) {
548 s->ffs = strtol(buf, NULL, 10);
549 }
550 if (av_find_info_tag(buf, sizeof(buf), "ipttl", p)) {
551 s->ipttl = strtol(buf, NULL, 10);
552 }
553 if (av_find_info_tag(buf, sizeof(buf), "iptos", p)) {
554 s->iptos = strtol(buf, NULL, 10);
555 }
556 if (av_find_info_tag(buf, sizeof(buf), "inputbw", p)) {
557 s->inputbw = strtoll(buf, NULL, 10);
558 }
559 if (av_find_info_tag(buf, sizeof(buf), "oheadbw", p)) {
560 s->oheadbw = strtoll(buf, NULL, 10);
561 }
562 if (av_find_info_tag(buf, sizeof(buf), "latency", p)) {
563 s->latency = strtol(buf, NULL, 10);
564 }
565 if (av_find_info_tag(buf, sizeof(buf), "tsbpddelay", p)) {
566 s->latency = strtol(buf, NULL, 10);
567 }
568 if (av_find_info_tag(buf, sizeof(buf), "rcvlatency", p)) {
569 s->rcvlatency = strtol(buf, NULL, 10);
570 }
571 if (av_find_info_tag(buf, sizeof(buf), "peerlatency", p)) {
572 s->peerlatency = strtol(buf, NULL, 10);
573 }
574 if (av_find_info_tag(buf, sizeof(buf), "tlpktdrop", p)) {
575 s->tlpktdrop = strtol(buf, NULL, 10);
576 }
577 if (av_find_info_tag(buf, sizeof(buf), "nakreport", p)) {
578 s->nakreport = strtol(buf, NULL, 10);
579 }
580 if (av_find_info_tag(buf, sizeof(buf), "connect_timeout", p)) {
581 s->connect_timeout = strtol(buf, NULL, 10);
582 }
583 if (av_find_info_tag(buf, sizeof(buf), "payload_size", p) ||
584 av_find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
585 s->payload_size = strtol(buf, NULL, 10);
586 }
587 if (av_find_info_tag(buf, sizeof(buf), "mode", p)) {
588 if (!strcmp(buf, "caller")) {
589 s->mode = SRT_MODE_CALLER;
590 } else if (!strcmp(buf, "listener")) {
591 s->mode = SRT_MODE_LISTENER;
592 } else if (!strcmp(buf, "rendezvous")) {
593 s->mode = SRT_MODE_RENDEZVOUS;
594 } else {
595 ret = AVERROR(EINVAL);
596 goto err;
597 }
598 }
599 if (av_find_info_tag(buf, sizeof(buf), "sndbuf", p)) {
600 s->sndbuf = strtol(buf, NULL, 10);
601 }
602 if (av_find_info_tag(buf, sizeof(buf), "rcvbuf", p)) {
603 s->rcvbuf = strtol(buf, NULL, 10);
604 }
605 if (av_find_info_tag(buf, sizeof(buf), "lossmaxttl", p)) {
606 s->lossmaxttl = strtol(buf, NULL, 10);
607 }
608 if (av_find_info_tag(buf, sizeof(buf), "minversion", p)) {
609 s->minversion = strtol(buf, NULL, 0);
610 }
611 if (av_find_info_tag(buf, sizeof(buf), "streamid", p)) {
612 av_freep(&s->streamid);
613 s->streamid = av_strdup(buf);
614 if (!s->streamid) {
615 ret = AVERROR(ENOMEM);
616 goto err;
617 }
618 }
619 if (av_find_info_tag(buf, sizeof(buf), "smoother", p)) {
620 av_freep(&s->smoother);
621 s->smoother = av_strdup(buf);
622 if(!s->smoother) {
623 ret = AVERROR(ENOMEM);
624 goto err;
625 }
626 }
627 if (av_find_info_tag(buf, sizeof(buf), "messageapi", p)) {
628 s->messageapi = strtol(buf, NULL, 10);
629 }
630 if (av_find_info_tag(buf, sizeof(buf), "transtype", p)) {
631 if (!strcmp(buf, "live")) {
632 s->transtype = SRTT_LIVE;
633 } else if (!strcmp(buf, "file")) {
634 s->transtype = SRTT_FILE;
635 } else {
636 ret = AVERROR(EINVAL);
637 goto err;
638 }
639 }
640 if (av_find_info_tag(buf, sizeof(buf), "linger", p)) {
641 s->linger = strtol(buf, NULL, 10);
642 }
643 }
644 ret = libsrt_setup(h, uri, flags);
645 if (ret < 0)
646 goto err;
647 return 0;
648
649 err:
650 av_freep(&s->smoother);
651 av_freep(&s->streamid);
652 srt_cleanup();
653 return ret;
654 }
655
libsrt_read(URLContext * h,uint8_t * buf,int size)656 static int libsrt_read(URLContext *h, uint8_t *buf, int size)
657 {
658 SRTContext *s = h->priv_data;
659 int ret;
660
661 if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
662 ret = libsrt_network_wait_fd_timeout(h, s->eid, 0, h->rw_timeout, &h->interrupt_callback);
663 if (ret)
664 return ret;
665 }
666
667 ret = srt_recvmsg(s->fd, buf, size);
668 if (ret < 0) {
669 ret = libsrt_neterrno(h);
670 }
671
672 return ret;
673 }
674
libsrt_write(URLContext * h,const uint8_t * buf,int size)675 static int libsrt_write(URLContext *h, const uint8_t *buf, int size)
676 {
677 SRTContext *s = h->priv_data;
678 int ret;
679
680 if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
681 ret = libsrt_network_wait_fd_timeout(h, s->eid, 1, h->rw_timeout, &h->interrupt_callback);
682 if (ret)
683 return ret;
684 }
685
686 ret = srt_sendmsg(s->fd, buf, size, -1, 0);
687 if (ret < 0) {
688 ret = libsrt_neterrno(h);
689 }
690
691 return ret;
692 }
693
libsrt_close(URLContext * h)694 static int libsrt_close(URLContext *h)
695 {
696 SRTContext *s = h->priv_data;
697
698 srt_epoll_release(s->eid);
699 srt_close(s->fd);
700
701 srt_cleanup();
702
703 return 0;
704 }
705
libsrt_get_file_handle(URLContext * h)706 static int libsrt_get_file_handle(URLContext *h)
707 {
708 SRTContext *s = h->priv_data;
709 return s->fd;
710 }
711
712 static const AVClass libsrt_class = {
713 .class_name = "libsrt",
714 .item_name = av_default_item_name,
715 .option = libsrt_options,
716 .version = LIBAVUTIL_VERSION_INT,
717 };
718
719 const URLProtocol ff_libsrt_protocol = {
720 .name = "srt",
721 .url_open = libsrt_open,
722 .url_read = libsrt_read,
723 .url_write = libsrt_write,
724 .url_close = libsrt_close,
725 .url_get_file_handle = libsrt_get_file_handle,
726 .priv_data_size = sizeof(SRTContext),
727 .flags = URL_PROTOCOL_FLAG_NETWORK,
728 .priv_data_class = &libsrt_class,
729 };
730