/*
* This file is part of DisOrder.
- * Copyright (C) 2009 Richard Kettlewell
+ * Copyright (C) 2009, 2013 Richard Kettlewell
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
#include <unistd.h>
#include <time.h>
#include <sys/uio.h>
+#include <pthread.h>
#include "uaudio.h"
#include "mem.h"
/** @brief RTP output socket */
static int rtp_fd;
+/** @brief RTP output socket (IPv6) */
+static int rtp_fd6;
+
/** @brief RTP SSRC */
static uint32_t rtp_id;
/** @brief Set while paused */
static volatile int rtp_paused;
+/** @brief RTP mode */
+static int rtp_mode;
+
+#define RTP_BROADCAST 1
+#define RTP_MULTICAST 2
+#define RTP_UNICAST 3
+#define RTP_REQUEST 4
+#define RTP_AUTO 5
+
+/** @brief A unicast client */
+struct rtp_recipient {
+ struct rtp_recipient *next;
+ struct sockaddr_storage sa;
+};
+
+/** @brief List of unicast clients */
+static struct rtp_recipient *rtp_recipient_list;
+
+/** @brief Mutex protecting data structures */
+static pthread_mutex_t rtp_lock = PTHREAD_MUTEX_INITIALIZER;
+
static const char *const rtp_options[] = {
"rtp-destination",
"rtp-destination-port",
"rtp-source-port",
"multicast-ttl",
"multicast-loop",
+ "rtp-mode",
NULL
};
uaudio_schedule_sent(nsamples);
return nsamples;
}
- 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 tranmission errors");
- return 0;
- } else
- rtp_errors /= 2; /* gradual decay */
+ if(rtp_mode == RTP_REQUEST) {
+ 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_fd : rtp_fd6,
+ &m, MSG_DONTWAIT|MSG_NOSIGNAL);
+ // TODO similar error handling to other case?
+ }
+ pthread_mutex_unlock(&rtp_lock);
+ } else {
+ 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);
}
static void rtp_open(void) {
- struct addrinfo *res, *sres;
+ struct addrinfo *dres, *sres;
static const int one = 1;
int sndbuf, target_sndbuf = 131072;
socklen_t len;
struct netaddress dst[1], src[1];
+ const char *mode;
- /* Get configuration */
+ /* 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",
"rtp-source",
"rtp-source-port",
src);
- /* ...microseconds */
-
- /* Resolve addresses */
- res = netaddress_resolve(dst, 0, IPPROTO_UDP);
- if(!res)
- exit(-1);
+ 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;
+ }
+ }
/* Create the socket */
- if((rtp_fd = socket(res->ai_family,
- res->ai_socktype,
- res->ai_protocol)) < 0)
- disorder_fatal(errno, "error creating broadcast socket");
- if(multicast(res->ai_addr)) {
+ 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");
+ } else { /* request mode slightly different */
+ if((rtp_fd = 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(res->ai_family) {
+ switch(dres->ai_family) {
case PF_INET: {
if(setsockopt(rtp_fd, IPPROTO_IP, IP_MULTICAST_TTL,
&ttl, sizeof ttl) < 0)
break;
}
default:
- disorder_fatal(0, "unsupported address family %d", res->ai_family);
+ disorder_fatal(0, "unsupported address family %d", dres->ai_family);
}
disorder_info("multicasting on %s TTL=%d loop=%s",
- format_sockaddr(res->ai_addr), ttl, loop ? "yes" : "no");
- } 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, res->ai_addr))
- break;
- ifs = ifs->ifa_next;
- }
- if(ifs) {
- 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 (%s)",
- format_sockaddr(res->ai_addr), ifs->ifa_name);
- } else
- disorder_info("unicasting on %s", format_sockaddr(res->ai_addr));
+ 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 buffer */
len = sizeof sndbuf;
disorder_error(errno, "error setting SO_SNDBUF to %d", target_sndbuf);
else
disorder_info("changed socket send buffer size from %d to %d",
- sndbuf, target_sndbuf);
+ sndbuf, target_sndbuf);
} else
disorder_info("default socket send buffer is %d", sndbuf);
/* We might well want to set additional broadcast- or multicast-related
* options here */
- 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, res->ai_addr, res->ai_addrlen) < 0)
- disorder_fatal(errno, "error connecting broadcast socket to %s",
- format_sockaddr(res->ai_addr));
+ 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));
+ }
if(config->rtp_verbose)
disorder_info("RTP: prepared socket");
}
uaudio_thread_stop();
close(rtp_fd);
rtp_fd = -1;
+ if(rtp_fd6 >= 0) {
+ close(rtp_fd6);
+ rtp_fd6 = -1;
+ }
}
static void rtp_configure(void) {
disorder_info("RTP: configured");
}
+/** @brief Add an RTP recipient address
+ * @param sa Pointer to recipient address
+ * @return 0 on success, -1 on error
+ */
+int rtp_add_recipient(const struct sockaddr_storage *sa) {
+ struct rtp_recipient *r;
+ int rc;
+ pthread_mutex_lock(&rtp_lock);
+ for(r = rtp_recipient_list;
+ r && sockaddrcmp((struct sockaddr *)sa,
+ (struct sockaddr *)&r->sa);
+ r = r->next)
+ ;
+ if(r)
+ rc = -1;
+ else {
+ r = xmalloc(sizeof *r);
+ memcpy(&r->sa, sa, sizeof sa);
+ r->next = rtp_recipient_list;
+ rtp_recipient_list = r;
+ rc = 0;
+ }
+ pthread_mutex_unlock(&rtp_lock);
+ return rc;
+}
+
+/** @brief Remove an RTP recipient address
+ * @param sa Pointer to recipient address
+ * @return 0 on success, -1 on error
+ */
+int rtp_remove_recipient(const struct sockaddr_storage *sa) {
+ struct rtp_recipient *r, **rr;
+ int rc;
+ pthread_mutex_lock(&rtp_lock);
+ for(rr = &rtp_recipient_list;
+ (r = *rr) && sockaddrcmp((struct sockaddr *)sa,
+ (struct sockaddr *)&r->sa);
+ rr = &r->next)
+ ;
+ if(r) {
+ *rr = r->next;
+ xfree(r);
+ rc = 0;
+ } else {
+ disorder_error(0, "bogus rtp_remove_recipient");
+ rc = -1;
+ }
+ pthread_mutex_unlock(&rtp_lock);
+ return rc;
+}
+
const struct uaudio uaudio_rtp = {
.name = "rtp",
.options = rtp_options,
~mdw / disorder / commitdiff