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/opt.h"
27 #include "libavutil/parseutils.h"
28 #include "libavutil/time.h"
29
30 #include "avformat.h"
31 #include "internal.h"
32 #include "network.h"
33 #include "os_support.h"
34 #include "url.h"
35
36 /* This is for MPEG-TS and it's a default SRTO_PAYLOADSIZE for SRTT_LIVE (8 TS packets) */
37 #ifndef SRT_LIVE_DEFAULT_PAYLOAD_SIZE
38 #define SRT_LIVE_DEFAULT_PAYLOAD_SIZE 1316
39 #endif
40
41 /* This is the maximum payload size for Live mode, should you have a different payload type than MPEG-TS */
42 #ifndef SRT_LIVE_MAX_PAYLOAD_SIZE
43 #define SRT_LIVE_MAX_PAYLOAD_SIZE 1456
44 #endif
45
46 enum SRTMode {
47 SRT_MODE_CALLER = 0,
48 SRT_MODE_LISTENER = 1,
49 SRT_MODE_RENDEZVOUS = 2
50 };
51
52 typedef struct SRTContext {
53 const AVClass *class;
54 int fd;
55 int eid;
56 int64_t rw_timeout;
57 int64_t listen_timeout;
58 int recv_buffer_size;
59 int send_buffer_size;
60
61 int64_t maxbw;
62 int pbkeylen;
63 char *passphrase;
64 #if SRT_VERSION_VALUE >= 0x010302
65 int enforced_encryption;
66 int kmrefreshrate;
67 int kmpreannounce;
68 int64_t snddropdelay;
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 int tsbpd;
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 { "snddropdelay", "The sender's extra delay(in microseconds) before dropping packets", OFFSET(snddropdelay), AV_OPT_TYPE_INT64, { .i64 = -2 }, -2, INT64_MAX, .flags = D|E },
116 #endif
117 { "mss", "The Maximum Segment Size", OFFSET(mss), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1500, .flags = D|E },
118 { "ffs", "Flight flag size (window size) (in bytes)", OFFSET(ffs), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
119 { "ipttl", "IP Time To Live", OFFSET(ipttl), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 255, .flags = D|E },
120 { "iptos", "IP Type of Service", OFFSET(iptos), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 255, .flags = D|E },
121 { "inputbw", "Estimated input stream rate", OFFSET(inputbw), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
122 { "oheadbw", "MaxBW ceiling based on % over input stream rate", OFFSET(oheadbw), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 100, .flags = D|E },
123 { "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 },
124 { "tsbpddelay", "deprecated, same effect as latency option", OFFSET(latency), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
125 { "rcvlatency", "receive latency (in microseconds)", OFFSET(rcvlatency), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
126 { "peerlatency", "peer latency (in microseconds)", OFFSET(peerlatency), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
127 { "tlpktdrop", "Enable too-late pkt drop", OFFSET(tlpktdrop), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, .flags = D|E },
128 { "nakreport", "Enable receiver to send periodic NAK reports", OFFSET(nakreport), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, .flags = D|E },
129 { "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 },
130 { "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" },
131 { "caller", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = SRT_MODE_CALLER }, INT_MIN, INT_MAX, .flags = D|E, "mode" },
132 { "listener", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = SRT_MODE_LISTENER }, INT_MIN, INT_MAX, .flags = D|E, "mode" },
133 { "rendezvous", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = SRT_MODE_RENDEZVOUS }, INT_MIN, INT_MAX, .flags = D|E, "mode" },
134 { "sndbuf", "Send buffer size (in bytes)", OFFSET(sndbuf), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
135 { "rcvbuf", "Receive buffer size (in bytes)", OFFSET(rcvbuf), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
136 { "lossmaxttl", "Maximum possible packet reorder tolerance", OFFSET(lossmaxttl), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
137 { "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 },
138 { "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 },
139 { "srt_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 },
140 { "smoother", "The type of Smoother used for the transmission for that socket", OFFSET(smoother), AV_OPT_TYPE_STRING, { .str = NULL }, .flags = D|E },
141 { "messageapi", "Enable message API", OFFSET(messageapi), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, .flags = D|E },
142 { "transtype", "The transmission type for the socket", OFFSET(transtype), AV_OPT_TYPE_INT, { .i64 = SRTT_INVALID }, SRTT_LIVE, SRTT_INVALID, .flags = D|E, "transtype" },
143 { "live", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = SRTT_LIVE }, INT_MIN, INT_MAX, .flags = D|E, "transtype" },
144 { "file", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = SRTT_FILE }, INT_MIN, INT_MAX, .flags = D|E, "transtype" },
145 { "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 },
146 { "tsbpd", "Timestamp-based packet delivery", OFFSET(tsbpd), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, .flags = D|E },
147 { NULL }
148 };
149
libsrt_neterrno(URLContext * h)150 static int libsrt_neterrno(URLContext *h)
151 {
152 int os_errno;
153 int err = srt_getlasterror(&os_errno);
154 if (err == SRT_EASYNCRCV || err == SRT_EASYNCSND)
155 return AVERROR(EAGAIN);
156 av_log(h, AV_LOG_ERROR, "%s\n", srt_getlasterror_str());
157 return os_errno ? AVERROR(os_errno) : AVERROR_UNKNOWN;
158 }
159
libsrt_getsockopt(URLContext * h,int fd,SRT_SOCKOPT optname,const char * optnamestr,void * optval,int * optlen)160 static int libsrt_getsockopt(URLContext *h, int fd, SRT_SOCKOPT optname, const char * optnamestr, void * optval, int * optlen)
161 {
162 if (srt_getsockopt(fd, 0, optname, optval, optlen) < 0) {
163 av_log(h, AV_LOG_ERROR, "failed to get option %s on socket: %s\n", optnamestr, srt_getlasterror_str());
164 return AVERROR(EIO);
165 }
166 return 0;
167 }
168
libsrt_socket_nonblock(int socket,int enable)169 static int libsrt_socket_nonblock(int socket, int enable)
170 {
171 int ret, blocking = enable ? 0 : 1;
172 /* Setting SRTO_{SND,RCV}SYN options to 1 enable blocking mode, setting them to 0 enable non-blocking mode. */
173 ret = srt_setsockopt(socket, 0, SRTO_SNDSYN, &blocking, sizeof(blocking));
174 if (ret < 0)
175 return ret;
176 return srt_setsockopt(socket, 0, SRTO_RCVSYN, &blocking, sizeof(blocking));
177 }
178
libsrt_epoll_create(URLContext * h,int fd,int write)179 static int libsrt_epoll_create(URLContext *h, int fd, int write)
180 {
181 int modes = SRT_EPOLL_ERR | (write ? SRT_EPOLL_OUT : SRT_EPOLL_IN);
182 int eid = srt_epoll_create();
183 if (eid < 0)
184 return libsrt_neterrno(h);
185 if (srt_epoll_add_usock(eid, fd, &modes) < 0) {
186 srt_epoll_release(eid);
187 return libsrt_neterrno(h);
188 }
189 return eid;
190 }
191
libsrt_network_wait_fd(URLContext * h,int eid,int write)192 static int libsrt_network_wait_fd(URLContext *h, int eid, int write)
193 {
194 int ret, len = 1, errlen = 1;
195 SRTSOCKET ready[1];
196 SRTSOCKET error[1];
197
198 if (write) {
199 ret = srt_epoll_wait(eid, error, &errlen, ready, &len, POLLING_TIME, 0, 0, 0, 0);
200 } else {
201 ret = srt_epoll_wait(eid, ready, &len, error, &errlen, POLLING_TIME, 0, 0, 0, 0);
202 }
203 if (ret < 0) {
204 if (srt_getlasterror(NULL) == SRT_ETIMEOUT)
205 ret = AVERROR(EAGAIN);
206 else
207 ret = libsrt_neterrno(h);
208 } else {
209 ret = errlen ? AVERROR(EIO) : 0;
210 }
211 return ret;
212 }
213
214 /* TODO de-duplicate code from ff_network_wait_fd_timeout() */
215
libsrt_network_wait_fd_timeout(URLContext * h,int eid,int write,int64_t timeout,AVIOInterruptCB * int_cb)216 static int libsrt_network_wait_fd_timeout(URLContext *h, int eid, int write, int64_t timeout, AVIOInterruptCB *int_cb)
217 {
218 int ret;
219 int64_t wait_start = 0;
220
221 while (1) {
222 if (ff_check_interrupt(int_cb))
223 return AVERROR_EXIT;
224 ret = libsrt_network_wait_fd(h, eid, write);
225 if (ret != AVERROR(EAGAIN))
226 return ret;
227 if (timeout > 0) {
228 if (!wait_start)
229 wait_start = av_gettime_relative();
230 else if (av_gettime_relative() - wait_start > timeout)
231 return AVERROR(ETIMEDOUT);
232 }
233 }
234 }
235
libsrt_listen(int eid,int fd,const struct sockaddr * addr,socklen_t addrlen,URLContext * h,int64_t timeout)236 static int libsrt_listen(int eid, int fd, const struct sockaddr *addr, socklen_t addrlen, URLContext *h, int64_t timeout)
237 {
238 int ret;
239 int reuse = 1;
240 /* Max streamid length plus an extra space for the terminating null character */
241 char streamid[513];
242 int streamid_len = sizeof(streamid);
243 if (srt_setsockopt(fd, SOL_SOCKET, SRTO_REUSEADDR, &reuse, sizeof(reuse))) {
244 av_log(h, AV_LOG_WARNING, "setsockopt(SRTO_REUSEADDR) failed\n");
245 }
246 if (srt_bind(fd, addr, addrlen))
247 return libsrt_neterrno(h);
248
249 if (srt_listen(fd, 1))
250 return libsrt_neterrno(h);
251
252 ret = libsrt_network_wait_fd_timeout(h, eid, 1, timeout, &h->interrupt_callback);
253 if (ret < 0)
254 return ret;
255
256 ret = srt_accept(fd, NULL, NULL);
257 if (ret < 0)
258 return libsrt_neterrno(h);
259 if (libsrt_socket_nonblock(ret, 1) < 0)
260 av_log(h, AV_LOG_DEBUG, "libsrt_socket_nonblock failed\n");
261 if (!libsrt_getsockopt(h, ret, SRTO_STREAMID, "SRTO_STREAMID", streamid, &streamid_len))
262 /* Note: returned streamid_len doesn't count the terminating null character */
263 av_log(h, AV_LOG_VERBOSE, "accept streamid [%s], length %d\n", streamid, streamid_len);
264
265 return ret;
266 }
267
libsrt_listen_connect(int eid,int fd,const struct sockaddr * addr,socklen_t addrlen,int64_t timeout,URLContext * h,int will_try_next)268 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)
269 {
270 int ret;
271
272 if (srt_connect(fd, addr, addrlen) < 0)
273 return libsrt_neterrno(h);
274
275 ret = libsrt_network_wait_fd_timeout(h, eid, 1, timeout, &h->interrupt_callback);
276 if (ret < 0) {
277 if (will_try_next) {
278 av_log(h, AV_LOG_WARNING,
279 "Connection to %s failed (%s), trying next address\n",
280 h->filename, av_err2str(ret));
281 } else {
282 av_log(h, AV_LOG_ERROR, "Connection to %s failed: %s\n",
283 h->filename, av_err2str(ret));
284 }
285 }
286 return ret;
287 }
288
libsrt_setsockopt(URLContext * h,int fd,SRT_SOCKOPT optname,const char * optnamestr,const void * optval,int optlen)289 static int libsrt_setsockopt(URLContext *h, int fd, SRT_SOCKOPT optname, const char * optnamestr, const void * optval, int optlen)
290 {
291 if (srt_setsockopt(fd, 0, optname, optval, optlen) < 0) {
292 av_log(h, AV_LOG_ERROR, "failed to set option %s on socket: %s\n", optnamestr, srt_getlasterror_str());
293 return AVERROR(EIO);
294 }
295 return 0;
296 }
297
298 /* - The "POST" options can be altered any time on a connected socket.
299 They MAY have also some meaning when set prior to connecting; such
300 option is SRTO_RCVSYN, which makes connect/accept call asynchronous.
301 Because of that this option is treated special way in this app. */
libsrt_set_options_post(URLContext * h,int fd)302 static int libsrt_set_options_post(URLContext *h, int fd)
303 {
304 SRTContext *s = h->priv_data;
305
306 if ((s->inputbw >= 0 && libsrt_setsockopt(h, fd, SRTO_INPUTBW, "SRTO_INPUTBW", &s->inputbw, sizeof(s->inputbw)) < 0) ||
307 (s->oheadbw >= 0 && libsrt_setsockopt(h, fd, SRTO_OHEADBW, "SRTO_OHEADBW", &s->oheadbw, sizeof(s->oheadbw)) < 0)) {
308 return AVERROR(EIO);
309 }
310 return 0;
311 }
312
313 /* - The "PRE" options must be set prior to connecting and can't be altered
314 on a connected socket, however if set on a listening socket, they are
315 derived by accept-ed socket. */
libsrt_set_options_pre(URLContext * h,int fd)316 static int libsrt_set_options_pre(URLContext *h, int fd)
317 {
318 SRTContext *s = h->priv_data;
319 int yes = 1;
320 int latency = s->latency / 1000;
321 int rcvlatency = s->rcvlatency / 1000;
322 int peerlatency = s->peerlatency / 1000;
323 #if SRT_VERSION_VALUE >= 0x010302
324 int snddropdelay = s->snddropdelay > 0 ? s->snddropdelay / 1000 : s->snddropdelay;
325 #endif
326 int connect_timeout = s->connect_timeout;
327
328 if ((s->mode == SRT_MODE_RENDEZVOUS && libsrt_setsockopt(h, fd, SRTO_RENDEZVOUS, "SRTO_RENDEZVOUS", &yes, sizeof(yes)) < 0) ||
329 (s->transtype != SRTT_INVALID && libsrt_setsockopt(h, fd, SRTO_TRANSTYPE, "SRTO_TRANSTYPE", &s->transtype, sizeof(s->transtype)) < 0) ||
330 (s->maxbw >= 0 && libsrt_setsockopt(h, fd, SRTO_MAXBW, "SRTO_MAXBW", &s->maxbw, sizeof(s->maxbw)) < 0) ||
331 (s->pbkeylen >= 0 && libsrt_setsockopt(h, fd, SRTO_PBKEYLEN, "SRTO_PBKEYLEN", &s->pbkeylen, sizeof(s->pbkeylen)) < 0) ||
332 (s->passphrase && libsrt_setsockopt(h, fd, SRTO_PASSPHRASE, "SRTO_PASSPHRASE", s->passphrase, strlen(s->passphrase)) < 0) ||
333 #if SRT_VERSION_VALUE >= 0x010302
334 #if SRT_VERSION_VALUE >= 0x010401
335 (s->enforced_encryption >= 0 && libsrt_setsockopt(h, fd, SRTO_ENFORCEDENCRYPTION, "SRTO_ENFORCEDENCRYPTION", &s->enforced_encryption, sizeof(s->enforced_encryption)) < 0) ||
336 #else
337 /* SRTO_STRICTENC == SRTO_ENFORCEDENCRYPTION (53), but for compatibility, we used SRTO_STRICTENC */
338 (s->enforced_encryption >= 0 && libsrt_setsockopt(h, fd, SRTO_STRICTENC, "SRTO_STRICTENC", &s->enforced_encryption, sizeof(s->enforced_encryption)) < 0) ||
339 #endif
340 (s->kmrefreshrate >= 0 && libsrt_setsockopt(h, fd, SRTO_KMREFRESHRATE, "SRTO_KMREFRESHRATE", &s->kmrefreshrate, sizeof(s->kmrefreshrate)) < 0) ||
341 (s->kmpreannounce >= 0 && libsrt_setsockopt(h, fd, SRTO_KMPREANNOUNCE, "SRTO_KMPREANNOUNCE", &s->kmpreannounce, sizeof(s->kmpreannounce)) < 0) ||
342 (s->snddropdelay >=-1 && libsrt_setsockopt(h, fd, SRTO_SNDDROPDELAY, "SRTO_SNDDROPDELAY", &snddropdelay, sizeof(snddropdelay)) < 0) ||
343 #endif
344 (s->mss >= 0 && libsrt_setsockopt(h, fd, SRTO_MSS, "SRTO_MSS", &s->mss, sizeof(s->mss)) < 0) ||
345 (s->ffs >= 0 && libsrt_setsockopt(h, fd, SRTO_FC, "SRTO_FC", &s->ffs, sizeof(s->ffs)) < 0) ||
346 (s->ipttl >= 0 && libsrt_setsockopt(h, fd, SRTO_IPTTL, "SRTO_IPTTL", &s->ipttl, sizeof(s->ipttl)) < 0) ||
347 (s->iptos >= 0 && libsrt_setsockopt(h, fd, SRTO_IPTOS, "SRTO_IPTOS", &s->iptos, sizeof(s->iptos)) < 0) ||
348 (s->latency >= 0 && libsrt_setsockopt(h, fd, SRTO_LATENCY, "SRTO_LATENCY", &latency, sizeof(latency)) < 0) ||
349 (s->rcvlatency >= 0 && libsrt_setsockopt(h, fd, SRTO_RCVLATENCY, "SRTO_RCVLATENCY", &rcvlatency, sizeof(rcvlatency)) < 0) ||
350 (s->peerlatency >= 0 && libsrt_setsockopt(h, fd, SRTO_PEERLATENCY, "SRTO_PEERLATENCY", &peerlatency, sizeof(peerlatency)) < 0) ||
351 (s->tlpktdrop >= 0 && libsrt_setsockopt(h, fd, SRTO_TLPKTDROP, "SRTO_TLPKTDROP", &s->tlpktdrop, sizeof(s->tlpktdrop)) < 0) ||
352 (s->nakreport >= 0 && libsrt_setsockopt(h, fd, SRTO_NAKREPORT, "SRTO_NAKREPORT", &s->nakreport, sizeof(s->nakreport)) < 0) ||
353 (connect_timeout >= 0 && libsrt_setsockopt(h, fd, SRTO_CONNTIMEO, "SRTO_CONNTIMEO", &connect_timeout, sizeof(connect_timeout)) <0 ) ||
354 (s->sndbuf >= 0 && libsrt_setsockopt(h, fd, SRTO_SNDBUF, "SRTO_SNDBUF", &s->sndbuf, sizeof(s->sndbuf)) < 0) ||
355 (s->rcvbuf >= 0 && libsrt_setsockopt(h, fd, SRTO_RCVBUF, "SRTO_RCVBUF", &s->rcvbuf, sizeof(s->rcvbuf)) < 0) ||
356 (s->lossmaxttl >= 0 && libsrt_setsockopt(h, fd, SRTO_LOSSMAXTTL, "SRTO_LOSSMAXTTL", &s->lossmaxttl, sizeof(s->lossmaxttl)) < 0) ||
357 (s->minversion >= 0 && libsrt_setsockopt(h, fd, SRTO_MINVERSION, "SRTO_MINVERSION", &s->minversion, sizeof(s->minversion)) < 0) ||
358 (s->streamid && libsrt_setsockopt(h, fd, SRTO_STREAMID, "SRTO_STREAMID", s->streamid, strlen(s->streamid)) < 0) ||
359 #if SRT_VERSION_VALUE >= 0x010401
360 (s->smoother && libsrt_setsockopt(h, fd, SRTO_CONGESTION, "SRTO_CONGESTION", s->smoother, strlen(s->smoother)) < 0) ||
361 #else
362 (s->smoother && libsrt_setsockopt(h, fd, SRTO_SMOOTHER, "SRTO_SMOOTHER", s->smoother, strlen(s->smoother)) < 0) ||
363 #endif
364 (s->messageapi >= 0 && libsrt_setsockopt(h, fd, SRTO_MESSAGEAPI, "SRTO_MESSAGEAPI", &s->messageapi, sizeof(s->messageapi)) < 0) ||
365 (s->payload_size >= 0 && libsrt_setsockopt(h, fd, SRTO_PAYLOADSIZE, "SRTO_PAYLOADSIZE", &s->payload_size, sizeof(s->payload_size)) < 0) ||
366 ((h->flags & AVIO_FLAG_WRITE) && libsrt_setsockopt(h, fd, SRTO_SENDER, "SRTO_SENDER", &yes, sizeof(yes)) < 0) ||
367 (s->tsbpd >= 0 && libsrt_setsockopt(h, fd, SRTO_TSBPDMODE, "SRTO_TSBPDMODE", &s->tsbpd, sizeof(s->tsbpd)) < 0)) {
368 return AVERROR(EIO);
369 }
370
371 if (s->linger >= 0) {
372 struct linger lin;
373 lin.l_linger = s->linger;
374 lin.l_onoff = lin.l_linger > 0 ? 1 : 0;
375 if (libsrt_setsockopt(h, fd, SRTO_LINGER, "SRTO_LINGER", &lin, sizeof(lin)) < 0)
376 return AVERROR(EIO);
377 }
378 return 0;
379 }
380
381
libsrt_setup(URLContext * h,const char * uri,int flags)382 static int libsrt_setup(URLContext *h, const char *uri, int flags)
383 {
384 struct addrinfo hints = { 0 }, *ai, *cur_ai;
385 int port, fd;
386 SRTContext *s = h->priv_data;
387 const char *p;
388 char buf[256];
389 int ret;
390 char hostname[1024],proto[1024],path[1024];
391 char portstr[10];
392 int64_t open_timeout = 0;
393 int eid, write_eid;
394
395 av_url_split(proto, sizeof(proto), NULL, 0, hostname, sizeof(hostname),
396 &port, path, sizeof(path), uri);
397 if (strcmp(proto, "srt"))
398 return AVERROR(EINVAL);
399 if (port <= 0 || port >= 65536) {
400 av_log(h, AV_LOG_ERROR, "Port missing in uri\n");
401 return AVERROR(EINVAL);
402 }
403 p = strchr(uri, '?');
404 if (p) {
405 if (av_find_info_tag(buf, sizeof(buf), "timeout", p)) {
406 s->rw_timeout = strtoll(buf, NULL, 10);
407 }
408 if (av_find_info_tag(buf, sizeof(buf), "listen_timeout", p)) {
409 s->listen_timeout = strtoll(buf, NULL, 10);
410 }
411 }
412 if (s->rw_timeout >= 0) {
413 open_timeout = h->rw_timeout = s->rw_timeout;
414 }
415 hints.ai_family = AF_UNSPEC;
416 hints.ai_socktype = SOCK_DGRAM;
417 snprintf(portstr, sizeof(portstr), "%d", port);
418 if (s->mode == SRT_MODE_LISTENER)
419 hints.ai_flags |= AI_PASSIVE;
420 ret = getaddrinfo(hostname[0] ? hostname : NULL, portstr, &hints, &ai);
421 if (ret) {
422 av_log(h, AV_LOG_ERROR,
423 "Failed to resolve hostname %s: %s\n",
424 hostname, gai_strerror(ret));
425 return AVERROR(EIO);
426 }
427
428 cur_ai = ai;
429
430 restart:
431
432 #if SRT_VERSION_VALUE >= 0x010401
433 fd = srt_create_socket();
434 #else
435 fd = srt_socket(cur_ai->ai_family, cur_ai->ai_socktype, 0);
436 #endif
437 if (fd < 0) {
438 ret = libsrt_neterrno(h);
439 goto fail;
440 }
441
442 if ((ret = libsrt_set_options_pre(h, fd)) < 0) {
443 goto fail;
444 }
445
446 /* Set the socket's send or receive buffer sizes, if specified.
447 If unspecified or setting fails, system default is used. */
448 if (s->recv_buffer_size > 0) {
449 srt_setsockopt(fd, SOL_SOCKET, SRTO_UDP_RCVBUF, &s->recv_buffer_size, sizeof (s->recv_buffer_size));
450 }
451 if (s->send_buffer_size > 0) {
452 srt_setsockopt(fd, SOL_SOCKET, SRTO_UDP_SNDBUF, &s->send_buffer_size, sizeof (s->send_buffer_size));
453 }
454 if (libsrt_socket_nonblock(fd, 1) < 0)
455 av_log(h, AV_LOG_DEBUG, "libsrt_socket_nonblock failed\n");
456
457 ret = write_eid = libsrt_epoll_create(h, fd, 1);
458 if (ret < 0)
459 goto fail1;
460 if (s->mode == SRT_MODE_LISTENER) {
461 // multi-client
462 ret = libsrt_listen(write_eid, fd, cur_ai->ai_addr, cur_ai->ai_addrlen, h, s->listen_timeout);
463 srt_epoll_release(write_eid);
464 if (ret < 0)
465 goto fail1;
466 srt_close(fd);
467 fd = ret;
468 } else {
469 if (s->mode == SRT_MODE_RENDEZVOUS) {
470 if (srt_bind(fd, cur_ai->ai_addr, cur_ai->ai_addrlen)) {
471 ret = libsrt_neterrno(h);
472 srt_epoll_release(write_eid);
473 goto fail1;
474 }
475 }
476
477 ret = libsrt_listen_connect(write_eid, fd, cur_ai->ai_addr, cur_ai->ai_addrlen,
478 open_timeout, h, !!cur_ai->ai_next);
479 srt_epoll_release(write_eid);
480 if (ret < 0) {
481 if (ret == AVERROR_EXIT)
482 goto fail1;
483 else
484 goto fail;
485 }
486 }
487 if ((ret = libsrt_set_options_post(h, fd)) < 0) {
488 goto fail;
489 }
490
491 if (flags & AVIO_FLAG_WRITE) {
492 int packet_size = 0;
493 int optlen = sizeof(packet_size);
494 ret = libsrt_getsockopt(h, fd, SRTO_PAYLOADSIZE, "SRTO_PAYLOADSIZE", &packet_size, &optlen);
495 if (ret < 0)
496 goto fail1;
497 if (packet_size > 0)
498 h->max_packet_size = packet_size;
499 }
500
501 ret = eid = libsrt_epoll_create(h, fd, flags & AVIO_FLAG_WRITE);
502 if (eid < 0)
503 goto fail1;
504
505 h->is_streamed = 1;
506 s->fd = fd;
507 s->eid = eid;
508
509 freeaddrinfo(ai);
510 return 0;
511
512 fail:
513 if (cur_ai->ai_next) {
514 /* Retry with the next sockaddr */
515 cur_ai = cur_ai->ai_next;
516 if (fd >= 0)
517 srt_close(fd);
518 ret = 0;
519 goto restart;
520 }
521 fail1:
522 if (fd >= 0)
523 srt_close(fd);
524 freeaddrinfo(ai);
525 return ret;
526 }
527
libsrt_open(URLContext * h,const char * uri,int flags)528 static int libsrt_open(URLContext *h, const char *uri, int flags)
529 {
530 SRTContext *s = h->priv_data;
531 const char * p;
532 char buf[1024];
533 int ret = 0;
534
535 if (srt_startup() < 0) {
536 return AVERROR_UNKNOWN;
537 }
538
539 /* SRT options (srt/srt.h) */
540 p = strchr(uri, '?');
541 if (p) {
542 if (av_find_info_tag(buf, sizeof(buf), "maxbw", p)) {
543 s->maxbw = strtoll(buf, NULL, 10);
544 }
545 if (av_find_info_tag(buf, sizeof(buf), "pbkeylen", p)) {
546 s->pbkeylen = strtol(buf, NULL, 10);
547 }
548 if (av_find_info_tag(buf, sizeof(buf), "passphrase", p)) {
549 av_freep(&s->passphrase);
550 s->passphrase = av_strndup(buf, strlen(buf));
551 }
552 #if SRT_VERSION_VALUE >= 0x010302
553 if (av_find_info_tag(buf, sizeof(buf), "enforced_encryption", p)) {
554 s->enforced_encryption = strtol(buf, NULL, 10);
555 }
556 if (av_find_info_tag(buf, sizeof(buf), "kmrefreshrate", p)) {
557 s->kmrefreshrate = strtol(buf, NULL, 10);
558 }
559 if (av_find_info_tag(buf, sizeof(buf), "kmpreannounce", p)) {
560 s->kmpreannounce = strtol(buf, NULL, 10);
561 }
562 if (av_find_info_tag(buf, sizeof(buf), "snddropdelay", p)) {
563 s->snddropdelay = strtoll(buf, NULL, 10);
564 }
565 #endif
566 if (av_find_info_tag(buf, sizeof(buf), "mss", p)) {
567 s->mss = strtol(buf, NULL, 10);
568 }
569 if (av_find_info_tag(buf, sizeof(buf), "ffs", p)) {
570 s->ffs = strtol(buf, NULL, 10);
571 }
572 if (av_find_info_tag(buf, sizeof(buf), "ipttl", p)) {
573 s->ipttl = strtol(buf, NULL, 10);
574 }
575 if (av_find_info_tag(buf, sizeof(buf), "iptos", p)) {
576 s->iptos = strtol(buf, NULL, 10);
577 }
578 if (av_find_info_tag(buf, sizeof(buf), "inputbw", p)) {
579 s->inputbw = strtoll(buf, NULL, 10);
580 }
581 if (av_find_info_tag(buf, sizeof(buf), "oheadbw", p)) {
582 s->oheadbw = strtol(buf, NULL, 10);
583 }
584 if (av_find_info_tag(buf, sizeof(buf), "latency", p)) {
585 s->latency = strtoll(buf, NULL, 10);
586 }
587 if (av_find_info_tag(buf, sizeof(buf), "tsbpddelay", p)) {
588 s->latency = strtoll(buf, NULL, 10);
589 }
590 if (av_find_info_tag(buf, sizeof(buf), "rcvlatency", p)) {
591 s->rcvlatency = strtoll(buf, NULL, 10);
592 }
593 if (av_find_info_tag(buf, sizeof(buf), "peerlatency", p)) {
594 s->peerlatency = strtoll(buf, NULL, 10);
595 }
596 if (av_find_info_tag(buf, sizeof(buf), "tlpktdrop", p)) {
597 s->tlpktdrop = strtol(buf, NULL, 10);
598 }
599 if (av_find_info_tag(buf, sizeof(buf), "nakreport", p)) {
600 s->nakreport = strtol(buf, NULL, 10);
601 }
602 if (av_find_info_tag(buf, sizeof(buf), "connect_timeout", p)) {
603 s->connect_timeout = strtoll(buf, NULL, 10);
604 }
605 if (av_find_info_tag(buf, sizeof(buf), "payload_size", p) ||
606 av_find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
607 s->payload_size = strtol(buf, NULL, 10);
608 }
609 if (av_find_info_tag(buf, sizeof(buf), "mode", p)) {
610 if (!strcmp(buf, "caller")) {
611 s->mode = SRT_MODE_CALLER;
612 } else if (!strcmp(buf, "listener")) {
613 s->mode = SRT_MODE_LISTENER;
614 } else if (!strcmp(buf, "rendezvous")) {
615 s->mode = SRT_MODE_RENDEZVOUS;
616 } else {
617 ret = AVERROR(EINVAL);
618 goto err;
619 }
620 }
621 if (av_find_info_tag(buf, sizeof(buf), "sndbuf", p)) {
622 s->sndbuf = strtol(buf, NULL, 10);
623 }
624 if (av_find_info_tag(buf, sizeof(buf), "rcvbuf", p)) {
625 s->rcvbuf = strtol(buf, NULL, 10);
626 }
627 if (av_find_info_tag(buf, sizeof(buf), "lossmaxttl", p)) {
628 s->lossmaxttl = strtol(buf, NULL, 10);
629 }
630 if (av_find_info_tag(buf, sizeof(buf), "minversion", p)) {
631 s->minversion = strtol(buf, NULL, 0);
632 }
633 if (av_find_info_tag(buf, sizeof(buf), "streamid", p)) {
634 av_freep(&s->streamid);
635 s->streamid = av_strdup(buf);
636 if (!s->streamid) {
637 ret = AVERROR(ENOMEM);
638 goto err;
639 }
640 }
641 if (av_find_info_tag(buf, sizeof(buf), "smoother", p)) {
642 av_freep(&s->smoother);
643 s->smoother = av_strdup(buf);
644 if(!s->smoother) {
645 ret = AVERROR(ENOMEM);
646 goto err;
647 }
648 }
649 if (av_find_info_tag(buf, sizeof(buf), "messageapi", p)) {
650 s->messageapi = strtol(buf, NULL, 10);
651 }
652 if (av_find_info_tag(buf, sizeof(buf), "transtype", p)) {
653 if (!strcmp(buf, "live")) {
654 s->transtype = SRTT_LIVE;
655 } else if (!strcmp(buf, "file")) {
656 s->transtype = SRTT_FILE;
657 } else {
658 ret = AVERROR(EINVAL);
659 goto err;
660 }
661 }
662 if (av_find_info_tag(buf, sizeof(buf), "linger", p)) {
663 s->linger = strtol(buf, NULL, 10);
664 }
665 }
666 ret = libsrt_setup(h, uri, flags);
667 if (ret < 0)
668 goto err;
669 return 0;
670
671 err:
672 av_freep(&s->smoother);
673 av_freep(&s->streamid);
674 srt_cleanup();
675 return ret;
676 }
677
libsrt_read(URLContext * h,uint8_t * buf,int size)678 static int libsrt_read(URLContext *h, uint8_t *buf, int size)
679 {
680 SRTContext *s = h->priv_data;
681 int ret;
682
683 if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
684 ret = libsrt_network_wait_fd_timeout(h, s->eid, 0, h->rw_timeout, &h->interrupt_callback);
685 if (ret)
686 return ret;
687 }
688
689 ret = srt_recvmsg(s->fd, buf, size);
690 if (ret < 0) {
691 ret = libsrt_neterrno(h);
692 }
693
694 return ret;
695 }
696
libsrt_write(URLContext * h,const uint8_t * buf,int size)697 static int libsrt_write(URLContext *h, const uint8_t *buf, int size)
698 {
699 SRTContext *s = h->priv_data;
700 int ret;
701
702 if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
703 ret = libsrt_network_wait_fd_timeout(h, s->eid, 1, h->rw_timeout, &h->interrupt_callback);
704 if (ret)
705 return ret;
706 }
707
708 ret = srt_sendmsg(s->fd, buf, size, -1, 1);
709 if (ret < 0) {
710 ret = libsrt_neterrno(h);
711 }
712
713 return ret;
714 }
715
libsrt_close(URLContext * h)716 static int libsrt_close(URLContext *h)
717 {
718 SRTContext *s = h->priv_data;
719
720 srt_epoll_release(s->eid);
721 srt_close(s->fd);
722
723 srt_cleanup();
724
725 return 0;
726 }
727
728 static const AVClass libsrt_class = {
729 .class_name = "libsrt",
730 .item_name = av_default_item_name,
731 .option = libsrt_options,
732 .version = LIBAVUTIL_VERSION_INT,
733 };
734
735 const URLProtocol ff_libsrt_protocol = {
736 .name = "srt",
737 .url_open = libsrt_open,
738 .url_read = libsrt_read,
739 .url_write = libsrt_write,
740 .url_close = libsrt_close,
741 .priv_data_size = sizeof(SRTContext),
742 .flags = URL_PROTOCOL_FLAG_NETWORK,
743 .priv_data_class = &libsrt_class,
744 };
745