X-Git-Url: https://git.distorted.org.uk/~mdw/disorder/blobdiff_plain/1c3f1e73710d27fb5ae5b4c15798d03e89e74363..01f871b46afe3cd78e311f0344d002d844baf2b9:/server/speaker-network.c

diff --git a/server/speaker-network.c b/server/speaker-network.c
index 3d3bbc0..c81b7db 100644
--- a/server/speaker-network.c
+++ b/server/speaker-network.c
@@ -30,6 +30,8 @@
 #include <sys/socket.h>
 #include <sys/uio.h>
 #include <assert.h>
+#include <net/if.h>
+#include <ifaddrs.h>
 
 #include "configuration.h"
 #include "syscalls.h"
@@ -37,6 +39,7 @@
 #include "addr.h"
 #include "timeval.h"
 #include "rtp.h"
+#include "ifreq.h"
 #include "speaker-protocol.h"
 #include "speaker.h"
 
@@ -103,6 +106,11 @@ static void network_init(void) {
   socklen_t len;
   char *sockname, *ssockname;
 
+  /* Override sample format */
+  config->sample_format.rate = 44100;
+  config->sample_format.channels = 2;
+  config->sample_format.bits = 16;
+  config->sample_format.byte_format = AO_FMT_BIG;
   res = get_address(&config->broadcast, &pref, &sockname);
   if(!res) exit(-1);
   if(config->broadcast_from.n) {
@@ -114,8 +122,51 @@ static void network_init(void) {
                    res->ai_socktype,
                    res->ai_protocol)) < 0)
     fatal(errno, "error creating broadcast socket");
-  if(setsockopt(bfd, SOL_SOCKET, SO_BROADCAST, &one, sizeof one) < 0)
-    fatal(errno, "error setting SO_BROADCAST on broadcast socket");
+  if((res->ai_family == PF_INET
+      && IN_MULTICAST(
+           ntohl(((struct sockaddr_in *)res->ai_addr)->sin_addr.s_addr)
+         ))
+     || (res->ai_family == PF_INET6
+         && IN6_IS_ADDR_MULTICAST(
+               &((struct sockaddr_in6 *)res->ai_addr)->sin6_addr
+            ))) {
+    /* Multicasting */
+    switch(res->ai_family) {
+    case PF_INET: {
+      const int mttl = config->multicast_ttl;
+      if(setsockopt(bfd, IPPROTO_IP, IP_MULTICAST_TTL, &mttl, sizeof mttl) < 0)
+        fatal(errno, "error setting IP_MULTICAST_TTL on multicast socket");
+      break;
+    }
+    case PF_INET6: {
+      const int mttl = config->multicast_ttl;
+      if(setsockopt(bfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
+                    &mttl, sizeof mttl) < 0)
+        fatal(errno, "error setting IPV6_MULTICAST_HOPS on multicast socket");
+      break;
+    }
+    default:
+      fatal(0, "unsupported address family %d", res->ai_family);
+    }
+    info("multicasting on %s", sockname);
+  } else {
+    struct ifaddrs *ifs;
+
+    if(getifaddrs(&ifs) < 0)
+      fatal(errno, "error calling getifaddrs");
+    while(ifs) {
+      if((ifs->ifa_flags & IFF_BROADCAST)
+         && sockaddr_equal(ifs->ifa_broadaddr, res->ai_addr))
+        break;
+      ifs = ifs->ifa_next;
+    }
+    if(ifs) {
+      if(setsockopt(bfd, SOL_SOCKET, SO_BROADCAST, &one, sizeof one) < 0)
+        fatal(errno, "error setting SO_BROADCAST on broadcast socket");
+      info("broadcasting on %s (%s)", sockname, ifs->ifa_name);
+    } else
+      info("unicasting on %s", sockname);
+  }
   len = sizeof sndbuf;
   if(getsockopt(bfd, SOL_SOCKET, SO_SNDBUF,
                 &sndbuf, &len) < 0)
@@ -139,10 +190,6 @@ static void network_init(void) {
   /* Select an SSRC */
   gcry_randomize(&rtp_id, sizeof rtp_id, GCRY_STRONG_RANDOM);
   info("selected network backend, sending to %s", sockname);
-  if(config->sample_format.byte_format != AO_FMT_BIG) {
-    info("forcing big-endian sample format");
-    config->sample_format.byte_format = AO_FMT_BIG;
-  }
 }
 
 /** @brief Play over the network */