+static void rtp_get_netconfig(const char *af,
+ const char *addr,
+ const char *port,
+ struct netaddress *na) {
+ char *vec[3];
+
+ vec[0] = uaudio_get(af, NULL);
+ vec[1] = uaudio_get(addr, NULL);
+ vec[2] = uaudio_get(port, NULL);
+ if(!*vec)
+ na->af = -1;
+ else
+ if(netaddress_parse(na, 3, vec))
+ disorder_fatal(0, "invalid RTP address");
+}
+
+static void rtp_set_netconfig(const char *af,
+ const char *addr,
+ const char *port,
+ const struct netaddress *na) {
+ uaudio_set(af, NULL);
+ uaudio_set(addr, NULL);
+ uaudio_set(port, NULL);
+ if(na->af != -1) {
+ int nvec;
+ char **vec;
+
+ netaddress_format(na, &nvec, &vec);
+ if(nvec > 0) {
+ uaudio_set(af, vec[0]);
+ xfree(vec[0]);
+ }
+ if(nvec > 1) {
+ uaudio_set(addr, vec[1]);
+ xfree(vec[1]);
+ }
+ if(nvec > 2) {
+ uaudio_set(port, vec[2]);
+ xfree(vec[2]);
+ }
+ xfree(vec);
+ }
+}
+
+static size_t rtp_play(void *buffer, size_t nsamples, unsigned flags) {
+ struct rtp_header header;
+ struct iovec vec[2];
+
+#if 0
+ if(flags & (UAUDIO_PAUSE|UAUDIO_RESUME))
+ fprintf(stderr, "rtp_play %zu samples%s%s%s%s\n", nsamples,
+ flags & UAUDIO_PAUSE ? " UAUDIO_PAUSE" : "",
+ flags & UAUDIO_RESUME ? " UAUDIO_RESUME" : "",
+ flags & UAUDIO_PLAYING ? " UAUDIO_PLAYING" : "",
+ flags & UAUDIO_PAUSED ? " UAUDIO_PAUSED" : "");
+#endif
+
+ /* We do as much work as possible before checking what time it is */
+ /* Fill out header */
+ header.vpxcc = 2 << 6; /* V=2, P=0, X=0, CC=0 */
+ header.seq = htons(rtp_sequence++);
+ header.ssrc = rtp_id;
+ header.mpt = rtp_payload;
+ /* If we've come out of a pause, set the marker bit */
+ if(flags & UAUDIO_RESUME)
+ header.mpt |= 0x80;
+#if !WORDS_BIGENDIAN
+ /* Convert samples to network byte order */
+ uint16_t *u = buffer, *const limit = u + nsamples;
+ while(u < limit) {
+ *u = htons(*u);
+ ++u;
+ }
+#endif
+ vec[0].iov_base = (void *)&header;
+ vec[0].iov_len = sizeof header;
+ vec[1].iov_base = buffer;
+ vec[1].iov_len = nsamples * uaudio_sample_size;
+ const uint32_t timestamp = uaudio_schedule_sync();
+ header.timestamp = htonl(rtp_base + (uint32_t)timestamp);
+
+ /* We send ~120 packets a second with current arrangements. So if we log
+ * once every 8192 packets we log about once a minute. */
+
+ if(!(ntohs(header.seq) & 8191)
+ && config->rtp_verbose)
+ disorder_info("RTP: seq %04"PRIx16" %08"PRIx32"+%08"PRIx32"=%08"PRIx32" ns %zu%s",
+ ntohs(header.seq),
+ rtp_base,
+ timestamp,
+ header.timestamp,
+ nsamples,
+ flags & UAUDIO_PAUSED ? " [paused]" : "");
+
+ /* If we're paused don't actually end a packet, we just pretend */
+ if(flags & UAUDIO_PAUSED) {
+ uaudio_schedule_sent(nsamples);
+ return nsamples;
+ }
+ /* Send stuff to explicitly registerd unicast addresses unconditionally */
+ struct rtp_recipient *r;
+ struct msghdr m;
+ memset(&m, 0, sizeof m);
+ m.msg_iov = vec;
+ m.msg_iovlen = 2;
+ pthread_mutex_lock(&rtp_lock);
+ for(r = rtp_recipient_list; r; r = r->next) {
+ m.msg_name = &r->sa;
+ m.msg_namelen = r->sa.ss_family == AF_INET ?
+ sizeof(struct sockaddr_in) : sizeof (struct sockaddr_in6);
+ sendmsg(r->sa.ss_family == AF_INET ? rtp_fd4 : rtp_fd6,
+ &m, MSG_DONTWAIT|MSG_NOSIGNAL);
+ // TODO similar error handling to other case?
+ }
+ pthread_mutex_unlock(&rtp_lock);
+ if(rtp_mode != RTP_REQUEST) {
+ int written_bytes;
+ do {
+ written_bytes = writev(rtp_fd, vec, 2);
+ } while(written_bytes < 0 && errno == EINTR);
+ if(written_bytes < 0) {
+ disorder_error(errno, "error transmitting audio data");
+ ++rtp_errors;
+ if(rtp_errors == 10)
+ disorder_fatal(0, "too many audio transmission errors");
+ return 0;
+ } else
+ rtp_errors /= 2; /* gradual decay */
+ }
+ /* TODO what can we sensibly do about short writes here? Really that's just
+ * an error and we ought to be using smaller packets. */
+ uaudio_schedule_sent(nsamples);
+ return nsamples;
+}
+
+static void hack_send_buffer_size(int fd, const char *what) {
+ int sndbuf, target_sndbuf = 131072;
+ socklen_t len = sizeof sndbuf;
+
+ if(getsockopt(fd, SOL_SOCKET, SO_SNDBUF,
+ &sndbuf, &len) < 0)
+ disorder_fatal(errno, "error getting SO_SNDBUF on %s socket", what);
+ if(target_sndbuf > sndbuf) {
+ if(setsockopt(fd, SOL_SOCKET, SO_SNDBUF,
+ &target_sndbuf, sizeof target_sndbuf) < 0)
+ disorder_error(errno, "error setting SO_SNDBUF on %s socket to %d",
+ what, target_sndbuf);
+ else
+ disorder_info("changed socket send buffer size on %socket from %d to %d",
+ what, sndbuf, target_sndbuf);
+ } else
+ disorder_info("default socket send buffer on %s socket is %d",
+ what, sndbuf);
+}
+
+static void rtp_open(void) {
+ struct addrinfo *dres, *sres;
+ static const int one = 1;
+ struct netaddress dst[1], src[1];
+ const char *mode;
+#ifdef IP_MTU_DISCOVER
+ const char *mtu_disc;
+ int opt;
+#endif
+
+ /* Get the mode */
+ mode = uaudio_get("rtp-mode", "auto");
+ if(!strcmp(mode, "broadcast")) rtp_mode = RTP_BROADCAST;
+ else if(!strcmp(mode, "multicast")) rtp_mode = RTP_MULTICAST;
+ else if(!strcmp(mode, "unicast")) rtp_mode = RTP_UNICAST;
+ else if(!strcmp(mode, "request")) rtp_mode = RTP_REQUEST;
+ else rtp_mode = RTP_AUTO;
+ /* Get the source and destination addresses (which might be missing) */
+ rtp_get_netconfig("rtp-destination-af",
+ "rtp-destination",
+ "rtp-destination-port",
+ dst);
+ rtp_get_netconfig("rtp-source-af",
+ "rtp-source",
+ "rtp-source-port",
+ src);
+ if(dst->af != -1) {
+ dres = netaddress_resolve(dst, 0, IPPROTO_UDP);
+ if(!dres)
+ exit(-1);
+ } else
+ dres = 0;
+ if(src->af != -1) {
+ sres = netaddress_resolve(src, 1, IPPROTO_UDP);
+ if(!sres)
+ exit(-1);
+ } else
+ sres = 0;
+ /* _AUTO inspects the destination address and acts accordingly */
+ if(rtp_mode == RTP_AUTO) {
+ if(!dres)
+ rtp_mode = RTP_REQUEST;
+ else if(multicast(dres->ai_addr))
+ rtp_mode = RTP_MULTICAST;
+ else {
+ struct ifaddrs *ifs;
+
+ if(getifaddrs(&ifs) < 0)
+ disorder_fatal(errno, "error calling getifaddrs");
+ while(ifs) {
+ /* (At least on Darwin) IFF_BROADCAST might be set but ifa_broadaddr
+ * still a null pointer. It turns out that there's a subsequent entry
+ * for he same interface which _does_ have ifa_broadaddr though... */
+ if((ifs->ifa_flags & IFF_BROADCAST)
+ && ifs->ifa_broadaddr
+ && sockaddr_equal(ifs->ifa_broadaddr, dres->ai_addr))
+ break;
+ ifs = ifs->ifa_next;
+ }
+ if(ifs)
+ rtp_mode = RTP_BROADCAST;
+ else
+ rtp_mode = RTP_UNICAST;
+ }
+ }
+ rtp_max_payload = atoi(uaudio_get("rtp-max-payload", "-1"));
+ if(rtp_max_payload < 0)
+ rtp_max_payload = 1500 - 8/*UDP*/ - 40/*IP*/ - 8/*conservatism*/;
+ /* Create the sockets */
+ if(rtp_mode != RTP_REQUEST) {
+ if((rtp_fd = socket(dres->ai_family,
+ dres->ai_socktype,
+ dres->ai_protocol)) < 0)
+ disorder_fatal(errno, "error creating RTP transmission socket");
+ }
+ if((rtp_fd4 = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
+ disorder_fatal(errno, "error creating v4 RTP transmission socket");
+ if((rtp_fd6 = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP)) < 0)
+ disorder_fatal(errno, "error creating v6 RTP transmission socket");
+ /* Configure the socket according to the desired mode */
+ switch(rtp_mode) {
+ case RTP_MULTICAST: {
+ /* Enable multicast options */
+ const int ttl = atoi(uaudio_get("multicast-ttl", "1"));
+ const int loop = !strcmp(uaudio_get("multicast-loop", "yes"), "yes");
+ switch(dres->ai_family) {
+ case PF_INET: {
+ if(setsockopt(rtp_fd, IPPROTO_IP, IP_MULTICAST_TTL,
+ &ttl, sizeof ttl) < 0)
+ disorder_fatal(errno, "error setting IP_MULTICAST_TTL on multicast socket");
+ if(setsockopt(rtp_fd, IPPROTO_IP, IP_MULTICAST_LOOP,
+ &loop, sizeof loop) < 0)
+ disorder_fatal(errno, "error setting IP_MULTICAST_LOOP on multicast socket");
+ break;
+ }
+ case PF_INET6: {
+ if(setsockopt(rtp_fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
+ &ttl, sizeof ttl) < 0)
+ disorder_fatal(errno, "error setting IPV6_MULTICAST_HOPS on multicast socket");
+ if(setsockopt(rtp_fd, IPPROTO_IP, IPV6_MULTICAST_LOOP,
+ &loop, sizeof loop) < 0)
+ disorder_fatal(errno, "error setting IPV6_MULTICAST_LOOP on multicast socket");
+ break;
+ }
+ default:
+ disorder_fatal(0, "unsupported address family %d", dres->ai_family);
+ }
+ disorder_info("multicasting on %s TTL=%d loop=%s",
+ format_sockaddr(dres->ai_addr), ttl, loop ? "yes" : "no");
+ break;
+ }
+ case RTP_UNICAST: {
+ disorder_info("unicasting on %s", format_sockaddr(dres->ai_addr));
+ break;
+ }
+ case RTP_BROADCAST: {
+ if(setsockopt(rtp_fd, SOL_SOCKET, SO_BROADCAST, &one, sizeof one) < 0)
+ disorder_fatal(errno, "error setting SO_BROADCAST on broadcast socket");
+ disorder_info("broadcasting on %s",
+ format_sockaddr(dres->ai_addr));
+ break;
+ }
+ case RTP_REQUEST: {
+ disorder_info("will transmit on request");
+ break;
+ }
+ }
+ /* Enlarge the socket buffers */
+ if (rtp_fd != -1) hack_send_buffer_size(rtp_fd, "master socket");
+ hack_send_buffer_size(rtp_fd4, "IPv4 on-demand socket");
+ hack_send_buffer_size(rtp_fd6, "IPv6 on-demand socket");
+ /* We might well want to set additional broadcast- or multicast-related
+ * options here */
+ if(rtp_mode != RTP_REQUEST) {
+ if(sres && bind(rtp_fd, sres->ai_addr, sres->ai_addrlen) < 0)
+ disorder_fatal(errno, "error binding broadcast socket to %s",
+ format_sockaddr(sres->ai_addr));
+ if(connect(rtp_fd, dres->ai_addr, dres->ai_addrlen) < 0)
+ disorder_fatal(errno, "error connecting broadcast socket to %s",
+ format_sockaddr(dres->ai_addr));
+ }
+#ifdef IP_MTU_DISCOVER
+ mtu_disc = uaudio_get("rtp-mtu-discovery", "default");
+ do {
+ if(!strcmp(mtu_disc, "yes")) opt = IP_PMTUDISC_DO;
+ else if(!strcmp(mtu_disc, "no")) opt = IP_PMTUDISC_DONT;
+ else break;
+ if(setsockopt(rtp_fd4, IPPROTO_IP, IP_MTU_DISCOVER, &opt, sizeof opt))
+ disorder_fatal(errno, "error setting MTU discovery");
+ if(sres->ai_family == AF_INET &&
+ setsockopt(rtp_fd, IPPROTO_IP, IP_MTU_DISCOVER, &opt, sizeof opt))
+ disorder_fatal(errno, "error setting MTU discovery");
+ } while (0);
+#endif
+ if(config->rtp_verbose)
+ disorder_info("RTP: prepared socket");
+}
+
~mdw / disorder / blobdiff