1 /*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 /**
20 * @file
21 * Haivision Open SRT (Secure Reliable Transport) protocol
22 */
23
24 #include <srt/srt.h>
25
26 #include "libavutil/avassert.h"
27 #include "libavutil/opt.h"
28 #include "libavutil/parseutils.h"
29 #include "libavutil/time.h"
30
31 #include "avformat.h"
32 #include "internal.h"
33 #include "network.h"
34 #include "os_support.h"
35 #include "url.h"
36
37 /* This is for MPEG-TS and it's a default SRTO_PAYLOADSIZE for SRTT_LIVE (8 TS packets) */
38 #ifndef SRT_LIVE_DEFAULT_PAYLOAD_SIZE
39 #define SRT_LIVE_DEFAULT_PAYLOAD_SIZE 1316
40 #endif
41
42 /* This is the maximum payload size for Live mode, should you have a different payload type than MPEG-TS */
43 #ifndef SRT_LIVE_MAX_PAYLOAD_SIZE
44 #define SRT_LIVE_MAX_PAYLOAD_SIZE 1456
45 #endif
46
47 enum SRTMode {
48 SRT_MODE_CALLER = 0,
49 SRT_MODE_LISTENER = 1,
50 SRT_MODE_RENDEZVOUS = 2
51 };
52
53 typedef struct SRTContext {
54 const AVClass *class;
55 int fd;
56 int eid;
57 int64_t rw_timeout;
58 int64_t listen_timeout;
59 int recv_buffer_size;
60 int send_buffer_size;
61
62 int64_t maxbw;
63 int pbkeylen;
64 char *passphrase;
65 #if SRT_VERSION_VALUE >= 0x010302
66 int enforced_encryption;
67 int kmrefreshrate;
68 int kmpreannounce;
69 #endif
70 int mss;
71 int ffs;
72 int ipttl;
73 int iptos;
74 int64_t inputbw;
75 int oheadbw;
76 int64_t latency;
77 int tlpktdrop;
78 int nakreport;
79 int64_t connect_timeout;
80 int payload_size;
81 int64_t rcvlatency;
82 int64_t peerlatency;
83 enum SRTMode mode;
84 int sndbuf;
85 int rcvbuf;
86 int lossmaxttl;
87 int minversion;
88 char *streamid;
89 char *smoother;
90 int messageapi;
91 SRT_TRANSTYPE transtype;
92 int linger;
93 } SRTContext;
94
95 #define D AV_OPT_FLAG_DECODING_PARAM
96 #define E AV_OPT_FLAG_ENCODING_PARAM
97 #define OFFSET(x) offsetof(SRTContext, x)
98 static const AVOption libsrt_options[] = {
99 { "timeout", "Timeout of socket I/O operations (in microseconds)", OFFSET(rw_timeout), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
100 { "listen_timeout", "Connection awaiting timeout (in microseconds)" , OFFSET(listen_timeout), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
101 { "send_buffer_size", "Socket send buffer size (in bytes)", OFFSET(send_buffer_size), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
102 { "recv_buffer_size", "Socket receive buffer size (in bytes)", OFFSET(recv_buffer_size), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
103 { "pkt_size", "Maximum SRT packet size", OFFSET(payload_size), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, SRT_LIVE_MAX_PAYLOAD_SIZE, .flags = D|E, "payload_size" },
104 { "payload_size", "Maximum SRT packet size", OFFSET(payload_size), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, SRT_LIVE_MAX_PAYLOAD_SIZE, .flags = D|E, "payload_size" },
105 { "ts_size", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = SRT_LIVE_DEFAULT_PAYLOAD_SIZE }, INT_MIN, INT_MAX, .flags = D|E, "payload_size" },
106 { "max_size", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = SRT_LIVE_MAX_PAYLOAD_SIZE }, INT_MIN, INT_MAX, .flags = D|E, "payload_size" },
107 { "maxbw", "Maximum bandwidth (bytes per second) that the connection can use", OFFSET(maxbw), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
108 { "pbkeylen", "Crypto key len in bytes {16,24,32} Default: 16 (128-bit)", OFFSET(pbkeylen), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 32, .flags = D|E },
109 { "passphrase", "Crypto PBKDF2 Passphrase size[0,10..64] 0:disable crypto", OFFSET(passphrase), AV_OPT_TYPE_STRING, { .str = NULL }, .flags = D|E },
110 #if SRT_VERSION_VALUE >= 0x010302
111 { "enforced_encryption", "Enforces that both connection parties have the same passphrase set", OFFSET(enforced_encryption), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, .flags = D|E },
112 { "kmrefreshrate", "The number of packets to be transmitted after which the encryption key is switched to a new key", OFFSET(kmrefreshrate), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
113 { "kmpreannounce", "The interval between when a new encryption key is sent and when switchover occurs", OFFSET(kmpreannounce), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
114 #endif
115 { "mss", "The Maximum Segment Size", OFFSET(mss), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1500, .flags = D|E },
116 { "ffs", "Flight flag size (window size) (in bytes)", OFFSET(ffs), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
117 { "ipttl", "IP Time To Live", OFFSET(ipttl), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 255, .flags = D|E },
118 { "iptos", "IP Type of Service", OFFSET(iptos), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 255, .flags = D|E },
119 { "inputbw", "Estimated input stream rate", OFFSET(inputbw), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
120 { "oheadbw", "MaxBW ceiling based on % over input stream rate", OFFSET(oheadbw), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 100, .flags = D|E },
121 { "latency", "receiver delay (in microseconds) to absorb bursts of missed packet retransmissions", OFFSET(latency), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
122 { "tsbpddelay", "deprecated, same effect as latency option", OFFSET(latency), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
123 { "rcvlatency", "receive latency (in microseconds)", OFFSET(rcvlatency), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
124 { "peerlatency", "peer latency (in microseconds)", OFFSET(peerlatency), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
125 { "tlpktdrop", "Enable receiver pkt drop", OFFSET(tlpktdrop), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, .flags = D|E },
126 { "nakreport", "Enable receiver to send periodic NAK reports", OFFSET(nakreport), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, .flags = D|E },
127 { "connect_timeout", "Connect timeout(in milliseconds). Caller default: 3000, rendezvous (x 10)", OFFSET(connect_timeout), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
128 { "mode", "Connection mode (caller, listener, rendezvous)", OFFSET(mode), AV_OPT_TYPE_INT, { .i64 = SRT_MODE_CALLER }, SRT_MODE_CALLER, SRT_MODE_RENDEZVOUS, .flags = D|E, "mode" },
129 { "caller", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = SRT_MODE_CALLER }, INT_MIN, INT_MAX, .flags = D|E, "mode" },
130 { "listener", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = SRT_MODE_LISTENER }, INT_MIN, INT_MAX, .flags = D|E, "mode" },
131 { "rendezvous", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = SRT_MODE_RENDEZVOUS }, INT_MIN, INT_MAX, .flags = D|E, "mode" },
132 { "sndbuf", "Send buffer size (in bytes)", OFFSET(sndbuf), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
133 { "rcvbuf", "Receive buffer size (in bytes)", OFFSET(rcvbuf), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
134 { "lossmaxttl", "Maximum possible packet reorder tolerance", OFFSET(lossmaxttl), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
135 { "minversion", "The minimum SRT version that is required from the peer", OFFSET(minversion), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
136 { "streamid", "A string of up to 512 characters that an Initiator can pass to a Responder", OFFSET(streamid), AV_OPT_TYPE_STRING, { .str = NULL }, .flags = D|E },
137 { "smoother", "The type of Smoother used for the transmission for that socket", OFFSET(smoother), AV_OPT_TYPE_STRING, { .str = NULL }, .flags = D|E },
138 { "messageapi", "Enable message API", OFFSET(messageapi), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, .flags = D|E },
139 { "transtype", "The transmission type for the socket", OFFSET(transtype), AV_OPT_TYPE_INT, { .i64 = SRTT_INVALID }, SRTT_LIVE, SRTT_INVALID, .flags = D|E, "transtype" },
140 { "live", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = SRTT_LIVE }, INT_MIN, INT_MAX, .flags = D|E, "transtype" },
141 { "file", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = SRTT_FILE }, INT_MIN, INT_MAX, .flags = D|E, "transtype" },
142 { "linger", "Number of seconds that the socket waits for unsent data when closing", OFFSET(linger), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
143 { NULL }
144 };
145
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_network_wait_fd(URLContext * h,int eid,int fd,int write)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
libsrt_network_wait_fd_timeout(URLContext * h,int eid,int fd,int write,int64_t timeout,AVIOInterruptCB * int_cb)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
libsrt_listen(int eid,int fd,const struct sockaddr * addr,socklen_t addrlen,URLContext * h,int64_t timeout)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
libsrt_listen_connect(int eid,int fd,const struct sockaddr * addr,socklen_t addrlen,int64_t timeout,URLContext * h,int will_try_next)243 static int libsrt_listen_connect(int eid, int fd, const struct sockaddr *addr, socklen_t addrlen, int64_t timeout, URLContext *h, int will_try_next)
244 {
245 int ret;
246
247 ret = srt_connect(fd, addr, addrlen);
248 if (ret < 0)
249 return libsrt_neterrno(h);
250
251 ret = libsrt_network_wait_fd_timeout(h, eid, fd, 1, timeout, &h->interrupt_callback);
252 if (ret < 0) {
253 if (will_try_next) {
254 av_log(h, AV_LOG_WARNING,
255 "Connection to %s failed (%s), trying next address\n",
256 h->filename, av_err2str(ret));
257 } else {
258 av_log(h, AV_LOG_ERROR, "Connection to %s failed: %s\n",
259 h->filename, av_err2str(ret));
260 }
261 }
262 return ret;
263 }
264
libsrt_setsockopt(URLContext * h,int fd,SRT_SOCKOPT optname,const char * optnamestr,const void * optval,int optlen)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
libsrt_getsockopt(URLContext * h,int fd,SRT_SOCKOPT optname,const char * optnamestr,void * optval,int * optlen)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. */
libsrt_set_options_post(URLContext * h,int fd)287 static int libsrt_set_options_post(URLContext *h, int fd)
288 {
289 SRTContext *s = h->priv_data;
290
291 if ((s->inputbw >= 0 && libsrt_setsockopt(h, fd, SRTO_INPUTBW, "SRTO_INPUTBW", &s->inputbw, sizeof(s->inputbw)) < 0) ||
292 (s->oheadbw >= 0 && libsrt_setsockopt(h, fd, SRTO_OHEADBW, "SRTO_OHEADBW", &s->oheadbw, sizeof(s->oheadbw)) < 0)) {
293 return AVERROR(EIO);
294 }
295 return 0;
296 }
297
298 /* - The "PRE" options must be set prior to connecting and can't be altered
299 on a connected socket, however if set on a listening socket, they are
300 derived by accept-ed socket. */
libsrt_set_options_pre(URLContext * h,int fd)301 static int libsrt_set_options_pre(URLContext *h, int fd)
302 {
303 SRTContext *s = h->priv_data;
304 int yes = 1;
305 int latency = s->latency / 1000;
306 int rcvlatency = s->rcvlatency / 1000;
307 int peerlatency = s->peerlatency / 1000;
308 int connect_timeout = s->connect_timeout;
309
310 if ((s->mode == SRT_MODE_RENDEZVOUS && libsrt_setsockopt(h, fd, SRTO_RENDEZVOUS, "SRTO_RENDEZVOUS", &yes, sizeof(yes)) < 0) ||
311 (s->transtype != SRTT_INVALID && libsrt_setsockopt(h, fd, SRTO_TRANSTYPE, "SRTO_TRANSTYPE", &s->transtype, sizeof(s->transtype)) < 0) ||
312 (s->maxbw >= 0 && libsrt_setsockopt(h, fd, SRTO_MAXBW, "SRTO_MAXBW", &s->maxbw, sizeof(s->maxbw)) < 0) ||
313 (s->pbkeylen >= 0 && libsrt_setsockopt(h, fd, SRTO_PBKEYLEN, "SRTO_PBKEYLEN", &s->pbkeylen, sizeof(s->pbkeylen)) < 0) ||
314 (s->passphrase && libsrt_setsockopt(h, fd, SRTO_PASSPHRASE, "SRTO_PASSPHRASE", s->passphrase, strlen(s->passphrase)) < 0) ||
315 #if SRT_VERSION_VALUE >= 0x010302
316 /* 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
libsrt_setup(URLContext * h,const char * uri,int flags)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
libsrt_open(URLContext * h,const char * uri,int flags)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")) {
570 s->mode = SRT_MODE_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
libsrt_read(URLContext * h,uint8_t * buf,int size)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)) {
633 ret = libsrt_network_wait_fd_timeout(h, s->eid, s->fd, 0, h->rw_timeout, &h->interrupt_callback);
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
libsrt_write(URLContext * h,const uint8_t * buf,int size)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)) {
652 ret = libsrt_network_wait_fd_timeout(h, s->eid, s->fd, 1, h->rw_timeout, &h->interrupt_callback);
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
libsrt_close(URLContext * h)665 static int libsrt_close(URLContext *h)
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
libsrt_get_file_handle(URLContext * h)678 static int libsrt_get_file_handle(URLContext *h)
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
691 const URLProtocol ff_libsrt_protocol = {
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),
699 .flags = URL_PROTOCOL_FLAG_NETWORK,
700 .priv_data_class = &libsrt_class,
701 };
702