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7a2c7068 RK |
1 | /* |
2 | * This file is part of DisOrder. | |
80fb0bd9 | 3 | * Copyright (C) 2009, 2013 Richard Kettlewell |
7a2c7068 RK |
4 | * |
5 | * This program is free software: you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation, either version 3 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
17 | */ | |
e8c185c3 | 18 | /** @file lib/uaudio-rtp.c |
7a2c7068 RK |
19 | * @brief Support for RTP network play backend */ |
20 | #include "common.h" | |
21 | ||
dfa51bb7 | 22 | #include <errno.h> |
60e5bc86 | 23 | #include <sys/socket.h> |
dfa51bb7 RK |
24 | #include <ifaddrs.h> |
25 | #include <net/if.h> | |
adeb58a0 RK |
26 | #include <arpa/inet.h> |
27 | #include <netinet/in.h> | |
dfa51bb7 RK |
28 | #include <gcrypt.h> |
29 | #include <unistd.h> | |
30 | #include <time.h> | |
60e5bc86 | 31 | #include <sys/uio.h> |
80fb0bd9 | 32 | #include <pthread.h> |
7a2c7068 RK |
33 | |
34 | #include "uaudio.h" | |
35 | #include "mem.h" | |
36 | #include "log.h" | |
37 | #include "syscalls.h" | |
dfa51bb7 RK |
38 | #include "rtp.h" |
39 | #include "addr.h" | |
40 | #include "ifreq.h" | |
41 | #include "timeval.h" | |
ba70caca | 42 | #include "configuration.h" |
dfa51bb7 RK |
43 | |
44 | /** @brief Bytes to send per network packet | |
45 | * | |
46 | * This is the maximum number of bytes we pass to write(2); to determine actual | |
47 | * packet sizes, add a UDP header and an IP header (and a link layer header if | |
48 | * it's the link layer size you care about). | |
49 | * | |
50 | * Don't make this too big or arithmetic will start to overflow. | |
51 | */ | |
52 | #define NETWORK_BYTES (1500-8/*UDP*/-40/*IP*/-8/*conservatism*/) | |
53 | ||
54 | /** @brief RTP payload type */ | |
55 | static int rtp_payload; | |
56 | ||
57 | /** @brief RTP output socket */ | |
58 | static int rtp_fd; | |
59 | ||
80fb0bd9 RK |
60 | /** @brief RTP output socket (IPv6) */ |
61 | static int rtp_fd6; | |
62 | ||
dfa51bb7 RK |
63 | /** @brief RTP SSRC */ |
64 | static uint32_t rtp_id; | |
65 | ||
b1f6ca8c RK |
66 | /** @brief Base for timestamp */ |
67 | static uint32_t rtp_base; | |
68 | ||
dfa51bb7 RK |
69 | /** @brief RTP sequence number */ |
70 | static uint16_t rtp_sequence; | |
71 | ||
dfa51bb7 RK |
72 | /** @brief Network error count |
73 | * | |
74 | * If too many errors occur in too short a time, we give up. | |
75 | */ | |
76 | static int rtp_errors; | |
77 | ||
80fb0bd9 RK |
78 | /** @brief RTP mode */ |
79 | static int rtp_mode; | |
80 | ||
81 | #define RTP_BROADCAST 1 | |
82 | #define RTP_MULTICAST 2 | |
83 | #define RTP_UNICAST 3 | |
84 | #define RTP_REQUEST 4 | |
85 | #define RTP_AUTO 5 | |
86 | ||
87 | /** @brief A unicast client */ | |
88 | struct rtp_recipient { | |
89 | struct rtp_recipient *next; | |
90 | struct sockaddr_storage sa; | |
91 | }; | |
92 | ||
93 | /** @brief List of unicast clients */ | |
94 | static struct rtp_recipient *rtp_recipient_list; | |
95 | ||
96 | /** @brief Mutex protecting data structures */ | |
97 | static pthread_mutex_t rtp_lock = PTHREAD_MUTEX_INITIALIZER; | |
98 | ||
7a2c7068 | 99 | static const char *const rtp_options[] = { |
dfa51bb7 RK |
100 | "rtp-destination", |
101 | "rtp-destination-port", | |
102 | "rtp-source", | |
103 | "rtp-source-port", | |
104 | "multicast-ttl", | |
105 | "multicast-loop", | |
80fb0bd9 | 106 | "rtp-mode", |
7a2c7068 RK |
107 | NULL |
108 | }; | |
109 | ||
76e72f65 RK |
110 | static void rtp_get_netconfig(const char *af, |
111 | const char *addr, | |
112 | const char *port, | |
113 | struct netaddress *na) { | |
114 | char *vec[3]; | |
115 | ||
116 | vec[0] = uaudio_get(af, NULL); | |
117 | vec[1] = uaudio_get(addr, NULL); | |
118 | vec[2] = uaudio_get(port, NULL); | |
119 | if(!*vec) | |
120 | na->af = -1; | |
121 | else | |
122 | if(netaddress_parse(na, 3, vec)) | |
2e9ba080 | 123 | disorder_fatal(0, "invalid RTP address"); |
76e72f65 RK |
124 | } |
125 | ||
126 | static void rtp_set_netconfig(const char *af, | |
127 | const char *addr, | |
128 | const char *port, | |
129 | const struct netaddress *na) { | |
130 | uaudio_set(af, NULL); | |
131 | uaudio_set(addr, NULL); | |
132 | uaudio_set(port, NULL); | |
133 | if(na->af != -1) { | |
134 | int nvec; | |
135 | char **vec; | |
136 | ||
137 | netaddress_format(na, &nvec, &vec); | |
138 | if(nvec > 0) { | |
139 | uaudio_set(af, vec[0]); | |
140 | xfree(vec[0]); | |
141 | } | |
142 | if(nvec > 1) { | |
143 | uaudio_set(addr, vec[1]); | |
144 | xfree(vec[1]); | |
145 | } | |
146 | if(nvec > 2) { | |
147 | uaudio_set(port, vec[2]); | |
148 | xfree(vec[2]); | |
149 | } | |
150 | xfree(vec); | |
151 | } | |
152 | } | |
153 | ||
b1f6ca8c | 154 | static size_t rtp_play(void *buffer, size_t nsamples, unsigned flags) { |
dfa51bb7 RK |
155 | struct rtp_header header; |
156 | struct iovec vec[2]; | |
b1f6ca8c RK |
157 | |
158 | #if 0 | |
159 | if(flags & (UAUDIO_PAUSE|UAUDIO_RESUME)) | |
160 | fprintf(stderr, "rtp_play %zu samples%s%s%s%s\n", nsamples, | |
161 | flags & UAUDIO_PAUSE ? " UAUDIO_PAUSE" : "", | |
162 | flags & UAUDIO_RESUME ? " UAUDIO_RESUME" : "", | |
163 | flags & UAUDIO_PLAYING ? " UAUDIO_PLAYING" : "", | |
164 | flags & UAUDIO_PAUSED ? " UAUDIO_PAUSED" : ""); | |
165 | #endif | |
166 | ||
dfa51bb7 RK |
167 | /* We do as much work as possible before checking what time it is */ |
168 | /* Fill out header */ | |
169 | header.vpxcc = 2 << 6; /* V=2, P=0, X=0, CC=0 */ | |
170 | header.seq = htons(rtp_sequence++); | |
171 | header.ssrc = rtp_id; | |
b1f6ca8c RK |
172 | header.mpt = rtp_payload; |
173 | /* If we've come out of a pause, set the marker bit */ | |
174 | if(flags & UAUDIO_RESUME) | |
175 | header.mpt |= 0x80; | |
dfa51bb7 RK |
176 | #if !WORDS_BIGENDIAN |
177 | /* Convert samples to network byte order */ | |
178 | uint16_t *u = buffer, *const limit = u + nsamples; | |
179 | while(u < limit) { | |
180 | *u = htons(*u); | |
181 | ++u; | |
182 | } | |
183 | #endif | |
184 | vec[0].iov_base = (void *)&header; | |
185 | vec[0].iov_len = sizeof header; | |
186 | vec[1].iov_base = buffer; | |
187 | vec[1].iov_len = nsamples * uaudio_sample_size; | |
b1f6ca8c RK |
188 | const uint32_t timestamp = uaudio_schedule_sync(); |
189 | header.timestamp = htonl(rtp_base + (uint32_t)timestamp); | |
87864f77 RK |
190 | |
191 | /* We send ~120 packets a second with current arrangements. So if we log | |
192 | * once every 8192 packets we log about once a minute. */ | |
193 | ||
194 | if(!(ntohs(header.seq) & 8191) | |
195 | && config->rtp_verbose) | |
196 | disorder_info("RTP: seq %04"PRIx16" %08"PRIx32"+%08"PRIx32"=%08"PRIx32" ns %zu%s", | |
197 | ntohs(header.seq), | |
198 | rtp_base, | |
199 | timestamp, | |
200 | header.timestamp, | |
201 | nsamples, | |
202 | flags & UAUDIO_PAUSED ? " [paused]" : ""); | |
203 | ||
b1f6ca8c RK |
204 | /* If we're paused don't actually end a packet, we just pretend */ |
205 | if(flags & UAUDIO_PAUSED) { | |
206 | uaudio_schedule_sent(nsamples); | |
207 | return nsamples; | |
208 | } | |
80fb0bd9 RK |
209 | if(rtp_mode == RTP_REQUEST) { |
210 | struct rtp_recipient *r; | |
211 | struct msghdr m; | |
212 | memset(&m, 0, sizeof m); | |
213 | m.msg_iov = vec; | |
214 | m.msg_iovlen = 2; | |
215 | pthread_mutex_lock(&rtp_lock); | |
216 | for(r = rtp_recipient_list; r; r = r->next) { | |
217 | m.msg_name = &r->sa; | |
218 | m.msg_namelen = r->sa.ss_family == AF_INET ? | |
219 | sizeof(struct sockaddr_in) : sizeof (struct sockaddr_in6); | |
220 | sendmsg(r->sa.ss_family == AF_INET ? rtp_fd : rtp_fd6, | |
221 | &m, MSG_DONTWAIT|MSG_NOSIGNAL); | |
222 | // TODO similar error handling to other case? | |
223 | } | |
224 | pthread_mutex_unlock(&rtp_lock); | |
225 | } else { | |
226 | int written_bytes; | |
227 | do { | |
228 | written_bytes = writev(rtp_fd, vec, 2); | |
229 | } while(written_bytes < 0 && errno == EINTR); | |
230 | if(written_bytes < 0) { | |
231 | disorder_error(errno, "error transmitting audio data"); | |
232 | ++rtp_errors; | |
233 | if(rtp_errors == 10) | |
234 | disorder_fatal(0, "too many audio transmission errors"); | |
235 | return 0; | |
236 | } else | |
237 | rtp_errors /= 2; /* gradual decay */ | |
238 | } | |
b1f6ca8c RK |
239 | /* TODO what can we sensibly do about short writes here? Really that's just |
240 | * an error and we ought to be using smaller packets. */ | |
241 | uaudio_schedule_sent(nsamples); | |
242 | return nsamples; | |
dfa51bb7 RK |
243 | } |
244 | ||
245 | static void rtp_open(void) { | |
80fb0bd9 | 246 | struct addrinfo *dres, *sres; |
dfa51bb7 RK |
247 | static const int one = 1; |
248 | int sndbuf, target_sndbuf = 131072; | |
249 | socklen_t len; | |
76e72f65 | 250 | struct netaddress dst[1], src[1]; |
80fb0bd9 | 251 | const char *mode; |
dfa51bb7 | 252 | |
80fb0bd9 RK |
253 | /* Get the mode */ |
254 | mode = uaudio_get("rtp-mode", "auto"); | |
255 | if(!strcmp(mode, "broadcast")) rtp_mode = RTP_BROADCAST; | |
256 | else if(!strcmp(mode, "multicast")) rtp_mode = RTP_MULTICAST; | |
257 | else if(!strcmp(mode, "unicast")) rtp_mode = RTP_UNICAST; | |
258 | else if(!strcmp(mode, "request")) rtp_mode = RTP_REQUEST; | |
259 | else rtp_mode = RTP_AUTO; | |
260 | /* Get the source and destination addresses (which might be missing) */ | |
76e72f65 RK |
261 | rtp_get_netconfig("rtp-destination-af", |
262 | "rtp-destination", | |
263 | "rtp-destination-port", | |
264 | dst); | |
265 | rtp_get_netconfig("rtp-source-af", | |
266 | "rtp-source", | |
267 | "rtp-source-port", | |
268 | src); | |
80fb0bd9 RK |
269 | if(dst->af != -1) { |
270 | dres = netaddress_resolve(dst, 0, IPPROTO_UDP); | |
271 | if(!dres) | |
272 | exit(-1); | |
273 | } else | |
274 | dres = 0; | |
76e72f65 RK |
275 | if(src->af != -1) { |
276 | sres = netaddress_resolve(src, 1, IPPROTO_UDP); | |
277 | if(!sres) | |
278 | exit(-1); | |
dfa51bb7 RK |
279 | } else |
280 | sres = 0; | |
80fb0bd9 RK |
281 | /* _AUTO inspects the destination address and acts accordingly */ |
282 | if(rtp_mode == RTP_AUTO) { | |
283 | if(!dres) | |
284 | rtp_mode = RTP_REQUEST; | |
285 | else if(multicast(dres->ai_addr)) | |
286 | rtp_mode = RTP_MULTICAST; | |
287 | else { | |
288 | struct ifaddrs *ifs; | |
289 | ||
290 | if(getifaddrs(&ifs) < 0) | |
291 | disorder_fatal(errno, "error calling getifaddrs"); | |
292 | while(ifs) { | |
293 | /* (At least on Darwin) IFF_BROADCAST might be set but ifa_broadaddr | |
294 | * still a null pointer. It turns out that there's a subsequent entry | |
295 | * for he same interface which _does_ have ifa_broadaddr though... */ | |
296 | if((ifs->ifa_flags & IFF_BROADCAST) | |
297 | && ifs->ifa_broadaddr | |
298 | && sockaddr_equal(ifs->ifa_broadaddr, dres->ai_addr)) | |
299 | break; | |
300 | ifs = ifs->ifa_next; | |
301 | } | |
302 | if(ifs) | |
303 | rtp_mode = RTP_BROADCAST; | |
304 | else | |
305 | rtp_mode = RTP_UNICAST; | |
306 | } | |
307 | } | |
dfa51bb7 | 308 | /* Create the socket */ |
80fb0bd9 RK |
309 | if(rtp_mode != RTP_REQUEST) { |
310 | if((rtp_fd = socket(dres->ai_family, | |
311 | dres->ai_socktype, | |
312 | dres->ai_protocol)) < 0) | |
313 | disorder_fatal(errno, "error creating RTP transmission socket"); | |
314 | } else { /* request mode slightly different */ | |
315 | if((rtp_fd = socket(AF_INET, | |
316 | SOCK_DGRAM, | |
317 | IPPROTO_UDP)) < 0) | |
318 | disorder_fatal(errno, "error creating v4 RTP transmission socket"); | |
319 | if((rtp_fd6 = socket(AF_INET6, | |
320 | SOCK_DGRAM, | |
321 | IPPROTO_UDP)) < 0) | |
322 | disorder_fatal(errno, "error creating v6 RTP transmission socket"); | |
323 | } | |
324 | /* Configure the socket according to the desired mode */ | |
325 | switch(rtp_mode) { | |
326 | case RTP_MULTICAST: { | |
dfa51bb7 | 327 | /* Enable multicast options */ |
b50cfb8a RK |
328 | const int ttl = atoi(uaudio_get("multicast-ttl", "1")); |
329 | const int loop = !strcmp(uaudio_get("multicast-loop", "yes"), "yes"); | |
80fb0bd9 | 330 | switch(dres->ai_family) { |
dfa51bb7 RK |
331 | case PF_INET: { |
332 | if(setsockopt(rtp_fd, IPPROTO_IP, IP_MULTICAST_TTL, | |
333 | &ttl, sizeof ttl) < 0) | |
2e9ba080 | 334 | disorder_fatal(errno, "error setting IP_MULTICAST_TTL on multicast socket"); |
dfa51bb7 RK |
335 | if(setsockopt(rtp_fd, IPPROTO_IP, IP_MULTICAST_LOOP, |
336 | &loop, sizeof loop) < 0) | |
2e9ba080 | 337 | disorder_fatal(errno, "error setting IP_MULTICAST_LOOP on multicast socket"); |
dfa51bb7 RK |
338 | break; |
339 | } | |
340 | case PF_INET6: { | |
341 | if(setsockopt(rtp_fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, | |
342 | &ttl, sizeof ttl) < 0) | |
2e9ba080 | 343 | disorder_fatal(errno, "error setting IPV6_MULTICAST_HOPS on multicast socket"); |
dfa51bb7 RK |
344 | if(setsockopt(rtp_fd, IPPROTO_IP, IPV6_MULTICAST_LOOP, |
345 | &loop, sizeof loop) < 0) | |
2e9ba080 | 346 | disorder_fatal(errno, "error setting IPV6_MULTICAST_LOOP on multicast socket"); |
dfa51bb7 RK |
347 | break; |
348 | } | |
349 | default: | |
80fb0bd9 | 350 | disorder_fatal(0, "unsupported address family %d", dres->ai_family); |
dfa51bb7 | 351 | } |
2e9ba080 | 352 | disorder_info("multicasting on %s TTL=%d loop=%s", |
80fb0bd9 RK |
353 | format_sockaddr(dres->ai_addr), ttl, loop ? "yes" : "no"); |
354 | break; | |
355 | } | |
356 | case RTP_UNICAST: { | |
357 | disorder_info("unicasting on %s", format_sockaddr(dres->ai_addr)); | |
358 | break; | |
359 | } | |
360 | case RTP_BROADCAST: { | |
361 | if(setsockopt(rtp_fd, SOL_SOCKET, SO_BROADCAST, &one, sizeof one) < 0) | |
362 | disorder_fatal(errno, "error setting SO_BROADCAST on broadcast socket"); | |
363 | disorder_info("broadcasting on %s", | |
364 | format_sockaddr(dres->ai_addr)); | |
365 | break; | |
366 | } | |
367 | case RTP_REQUEST: { | |
368 | disorder_info("will transmit on request"); | |
369 | break; | |
370 | } | |
dfa51bb7 RK |
371 | } |
372 | /* Enlarge the socket buffer */ | |
373 | len = sizeof sndbuf; | |
374 | if(getsockopt(rtp_fd, SOL_SOCKET, SO_SNDBUF, | |
375 | &sndbuf, &len) < 0) | |
2e9ba080 | 376 | disorder_fatal(errno, "error getting SO_SNDBUF"); |
dfa51bb7 RK |
377 | if(target_sndbuf > sndbuf) { |
378 | if(setsockopt(rtp_fd, SOL_SOCKET, SO_SNDBUF, | |
379 | &target_sndbuf, sizeof target_sndbuf) < 0) | |
2e9ba080 | 380 | disorder_error(errno, "error setting SO_SNDBUF to %d", target_sndbuf); |
dfa51bb7 | 381 | else |
2e9ba080 | 382 | disorder_info("changed socket send buffer size from %d to %d", |
80fb0bd9 | 383 | sndbuf, target_sndbuf); |
dfa51bb7 | 384 | } else |
2e9ba080 | 385 | disorder_info("default socket send buffer is %d", sndbuf); |
dfa51bb7 RK |
386 | /* We might well want to set additional broadcast- or multicast-related |
387 | * options here */ | |
80fb0bd9 RK |
388 | if(rtp_mode != RTP_REQUEST) { |
389 | if(sres && bind(rtp_fd, sres->ai_addr, sres->ai_addrlen) < 0) | |
390 | disorder_fatal(errno, "error binding broadcast socket to %s", | |
391 | format_sockaddr(sres->ai_addr)); | |
392 | if(connect(rtp_fd, dres->ai_addr, dres->ai_addrlen) < 0) | |
393 | disorder_fatal(errno, "error connecting broadcast socket to %s", | |
394 | format_sockaddr(dres->ai_addr)); | |
395 | } | |
87864f77 RK |
396 | if(config->rtp_verbose) |
397 | disorder_info("RTP: prepared socket"); | |
dfa51bb7 RK |
398 | } |
399 | ||
7a2c7068 RK |
400 | static void rtp_start(uaudio_callback *callback, |
401 | void *userdata) { | |
dfa51bb7 RK |
402 | /* We only support L16 (but we do stereo and mono and will convert sign) */ |
403 | if(uaudio_channels == 2 | |
404 | && uaudio_bits == 16 | |
405 | && uaudio_rate == 44100) | |
406 | rtp_payload = 10; | |
407 | else if(uaudio_channels == 1 | |
408 | && uaudio_bits == 16 | |
409 | && uaudio_rate == 44100) | |
410 | rtp_payload = 11; | |
411 | else | |
2e9ba080 RK |
412 | disorder_fatal(0, "asked for %d/%d/%d 16/44100/1 and 16/44100/2", |
413 | uaudio_bits, uaudio_rate, uaudio_channels); | |
87864f77 RK |
414 | if(config->rtp_verbose) |
415 | disorder_info("RTP: %d channels %d bits %d Hz payload type %d", | |
416 | uaudio_channels, uaudio_bits, uaudio_rate, rtp_payload); | |
ec57f6c9 RK |
417 | /* Various fields are required to have random initial values by RFC3550. The |
418 | * packet contents are highly public so there's no point asking for very | |
419 | * strong randomness. */ | |
420 | gcry_create_nonce(&rtp_id, sizeof rtp_id); | |
b1f6ca8c | 421 | gcry_create_nonce(&rtp_base, sizeof rtp_base); |
ec57f6c9 | 422 | gcry_create_nonce(&rtp_sequence, sizeof rtp_sequence); |
87864f77 RK |
423 | if(config->rtp_verbose) |
424 | disorder_info("RTP: id %08"PRIx32" base %08"PRIx32" initial seq %08"PRIx16, | |
425 | rtp_id, rtp_base, rtp_sequence); | |
dfa51bb7 | 426 | rtp_open(); |
ec57f6c9 | 427 | uaudio_schedule_init(); |
87864f77 RK |
428 | if(config->rtp_verbose) |
429 | disorder_info("RTP: initialized schedule"); | |
dfa51bb7 RK |
430 | uaudio_thread_start(callback, |
431 | userdata, | |
432 | rtp_play, | |
433 | 256 / uaudio_sample_size, | |
434 | (NETWORK_BYTES - sizeof(struct rtp_header)) | |
63761c19 RK |
435 | / uaudio_sample_size, |
436 | 0); | |
87864f77 RK |
437 | if(config->rtp_verbose) |
438 | disorder_info("RTP: created thread"); | |
7a2c7068 RK |
439 | } |
440 | ||
441 | static void rtp_stop(void) { | |
dfa51bb7 RK |
442 | uaudio_thread_stop(); |
443 | close(rtp_fd); | |
444 | rtp_fd = -1; | |
80fb0bd9 RK |
445 | if(rtp_fd6 >= 0) { |
446 | close(rtp_fd6); | |
447 | rtp_fd6 = -1; | |
448 | } | |
7a2c7068 RK |
449 | } |
450 | ||
ba70caca RK |
451 | static void rtp_configure(void) { |
452 | char buffer[64]; | |
453 | ||
b0116b5c | 454 | uaudio_set("rtp-mode", config->rtp_mode); |
76e72f65 RK |
455 | rtp_set_netconfig("rtp-destination-af", |
456 | "rtp-destination", | |
457 | "rtp-destination-port", &config->broadcast); | |
458 | rtp_set_netconfig("rtp-source-af", | |
459 | "rtp-source", | |
460 | "rtp-source-port", &config->broadcast_from); | |
ba70caca RK |
461 | snprintf(buffer, sizeof buffer, "%ld", config->multicast_ttl); |
462 | uaudio_set("multicast-ttl", buffer); | |
463 | uaudio_set("multicast-loop", config->multicast_loop ? "yes" : "no"); | |
87864f77 RK |
464 | if(config->rtp_verbose) |
465 | disorder_info("RTP: configured"); | |
ba70caca RK |
466 | } |
467 | ||
80fb0bd9 RK |
468 | /** @brief Add an RTP recipient address |
469 | * @param sa Pointer to recipient address | |
470 | * @return 0 on success, -1 on error | |
471 | */ | |
472 | int rtp_add_recipient(const struct sockaddr_storage *sa) { | |
473 | struct rtp_recipient *r; | |
474 | int rc; | |
475 | pthread_mutex_lock(&rtp_lock); | |
476 | for(r = rtp_recipient_list; | |
477 | r && sockaddrcmp((struct sockaddr *)sa, | |
478 | (struct sockaddr *)&r->sa); | |
479 | r = r->next) | |
480 | ; | |
481 | if(r) | |
482 | rc = -1; | |
483 | else { | |
484 | r = xmalloc(sizeof *r); | |
c0dadbae | 485 | memcpy(&r->sa, sa, sizeof *sa); |
80fb0bd9 RK |
486 | r->next = rtp_recipient_list; |
487 | rtp_recipient_list = r; | |
488 | rc = 0; | |
489 | } | |
490 | pthread_mutex_unlock(&rtp_lock); | |
491 | return rc; | |
492 | } | |
493 | ||
494 | /** @brief Remove an RTP recipient address | |
495 | * @param sa Pointer to recipient address | |
496 | * @return 0 on success, -1 on error | |
497 | */ | |
498 | int rtp_remove_recipient(const struct sockaddr_storage *sa) { | |
499 | struct rtp_recipient *r, **rr; | |
500 | int rc; | |
501 | pthread_mutex_lock(&rtp_lock); | |
502 | for(rr = &rtp_recipient_list; | |
503 | (r = *rr) && sockaddrcmp((struct sockaddr *)sa, | |
504 | (struct sockaddr *)&r->sa); | |
505 | rr = &r->next) | |
506 | ; | |
507 | if(r) { | |
508 | *rr = r->next; | |
509 | xfree(r); | |
510 | rc = 0; | |
511 | } else { | |
512 | disorder_error(0, "bogus rtp_remove_recipient"); | |
513 | rc = -1; | |
514 | } | |
515 | pthread_mutex_unlock(&rtp_lock); | |
516 | return rc; | |
517 | } | |
518 | ||
7a2c7068 RK |
519 | const struct uaudio uaudio_rtp = { |
520 | .name = "rtp", | |
521 | .options = rtp_options, | |
522 | .start = rtp_start, | |
523 | .stop = rtp_stop, | |
b1f6ca8c RK |
524 | .activate = uaudio_thread_activate, |
525 | .deactivate = uaudio_thread_deactivate, | |
ba70caca | 526 | .configure = rtp_configure, |
06385470 | 527 | .flags = UAUDIO_API_SERVER, |
7a2c7068 RK |
528 | }; |
529 | ||
530 | /* | |
531 | Local Variables: | |
532 | c-basic-offset:2 | |
533 | comment-column:40 | |
534 | fill-column:79 | |
535 | indent-tabs-mode:nil | |
536 | End: | |
537 | */ |