- Support for setting DSCP via dscp option

- Support for setting outgoing IPv4 multicast interface
  (note that only the Linux kernel can do that)
- Some cleaning/dirtying up

src/libvlc.h

@@ -437,15 +437,20 @@ static char *ppsz_clock_descriptions[] =
     "the multicast packets sent by the stream output (0 = use operating "\
     "system built-in default).")
 
-#define MIFACE_TEXT N_("IPv6 multicast output interface")
+#define MIFACE_TEXT N_("Multicast output interface")
 #define MIFACE_LONGTEXT N_( \
-    "Default IPv6 multicast interface. This overrides the routing table.")
+    "Default multicast interface. This overrides the routing table.")
 
 #define MIFACE_ADDR_TEXT N_("IPv4 multicast output interface address")
 #define MIFACE_ADDR_LONGTEXT N_( \
     "IPv4 adress for the default multicast interface. This overrides " \
     "the routing table.")
 
+#define DSCP_TEXT N_("DiffServ Code Point")
+#define DSCP_LONGTEXT N_("Differentiated Services Code Point " \
+    "for outgoing UDP streams (or IPv4 Type Of Service, " \
+    "or IPv6 Traffic Class). This is used for network Quality of Service.")
+
 #define INPUT_PROGRAM_TEXT N_("Program")
 #define INPUT_PROGRAM_LONGTEXT N_( \
     "Choose the program to select by giving its Service ID. " \
@@ -1535,6 +1540,7 @@ vlc_module_begin();
     add_integer( "ttl", 0, NULL, TTL_TEXT, TTL_LONGTEXT, VLC_TRUE );
     add_string( "miface", NULL, NULL, MIFACE_TEXT, MIFACE_LONGTEXT, VLC_TRUE );
     add_string( "miface-addr", NULL, NULL, MIFACE_ADDR_TEXT, MIFACE_ADDR_LONGTEXT, VLC_TRUE );
+    add_integer( "dscp", 0, NULL, DSCP_TEXT, DSCP_LONGTEXT, VLC_TRUE );
 
     set_subcategory( SUBCAT_SOUT_PACKETIZER );
     add_module( "packetizer","packetizer", NULL, NULL,

src/network/udp.c

@@ -111,61 +111,81 @@ static int net_SetMcastHopLimit( vlc_object_t *p_this,
 }
 
 
-static int net_SetMcastIface( vlc_object_t *p_this,
-                              int fd, int family, const char *str )
+static int net_SetMcastOutIface (int fd, int family, int scope)
 {
-    switch( family )
+    switch (family)
     {
-#ifndef SYS_BEOS
+#ifdef IPV6_MULTICAST_IF
+        case AF_INET6:
+            return setsockopt (fd, SOL_IPV6, IPV6_MULTICAST_IF,
+                               &scope, sizeof (scope));
+#endif
+
+#ifdef __linux__
         case AF_INET:
         {
-            struct in_addr addr;
-
-            if( inet_pton( AF_INET, str, &addr) <= 0 )
-            {
-                msg_Err( p_this, "Invalid multicast interface %s", str );
-                return VLC_EGENERIC;
-            }
+            struct ip_mreqn req = { .imr_ifindex = scope };
 
-            if( setsockopt( fd, SOL_IP, IP_MULTICAST_IF, &addr,
-                            sizeof( addr ) ) < 0 )
-            {
-                msg_Err( p_this, "Cannot use %s as multicast interface: %s",
-                         str, strerror(errno) );
-                return VLC_EGENERIC;
-            }
-            break;
+            return setsockopt (fd, SOL_IP, IP_MULTICAST_IF, &req,
+                               sizeof (req));
         }
-#endif /* SYS_BEOS */
+#endif
+    }
 
-#ifdef IPV6_MULTICAST_IF
-        case AF_INET6:
+    errno = EAFNOSUPPORT;
+    return -1;
+}
+
+
+static inline int net_SetMcastOutIPv4 (int fd, struct in_addr ipv4)
+{
+#ifdef IP_MULTICAST_IF
+    return setsockopt( fd, SOL_IP, IP_MULTICAST_IF, &ipv4, sizeof (ipv4));
+#else
+    errno = EAFNOSUPPORT;
+    return -1;
+#endif
+}
+
+
+static int net_SetMcastOut (vlc_object_t *p_this, int fd, int family,
+                            const char *iface, const char *addr)
+{
+    if (iface != NULL)
+    {
+        int scope = if_nametoindex (iface);
+        if (scope == 0)
         {
-            int scope = if_nametoindex( str );
+            msg_Err (p_this, "%s: invalid interface for multicast", iface);
+            return -1;
+        }
 
-            if( scope == 0 )
-            {
-                msg_Err( p_this, "Invalid multicast interface %s", str );
-                return VLC_EGENERIC;
-            }
+        if (net_SetMcastOutIface (fd, family, scope) == 0)
+            return 0;
 
-            if( setsockopt( fd, SOL_IPV6, IPV6_MULTICAST_IF,
-                            &scope, sizeof( scope ) ) < 0 )
+        msg_Err (p_this, "%s: %s", iface, net_strerror (net_errno));
+    }
+
+    if (addr != NULL)
+    {
+        if (family == AF_INET)
+        {
+            struct in_addr ipv4;
+            if (inet_pton (AF_INET, addr, &ipv4) <= 0)
             {
-                msg_Err( p_this, "Cannot use %s as multicast interface: %s",
-                         str, strerror( errno ) );
-                return VLC_EGENERIC;
+                msg_Err (p_this, "%s: invalid IPv4 address for multicast",
+                         addr);
+                return -1;
             }
-            break;
-        }
-#endif
 
-        default:
-            msg_Warn( p_this, "%s", strerror( EAFNOSUPPORT ) );
-            return VLC_EGENERIC;
+            if (net_SetMcastOutIPv4 (fd, ipv4) == 0)
+                return 0;
+
+            msg_Err (p_this, "%s: %s", addr, net_strerror (net_errno));
+        }
     }
 
-    return VLC_SUCCESS;
+    return -1;
 }
 
 
@@ -236,44 +256,41 @@ int __net_ConnectUDP( vlc_object_t *p_this, const char *psz_host, int i_port,
 
     for( ptr = res; ptr != NULL; ptr = ptr->ai_next )
     {
-        int fd;
-        char *psz_mif;
-
-        fd = net_Socket( p_this, ptr->ai_family, ptr->ai_socktype,
-                         ptr->ai_protocol );
-        if( fd == -1 )
+        char *str;
+        int fd = net_Socket (p_this, ptr->ai_family, ptr->ai_socktype,
+                             ptr->ai_protocol);
+        if (fd == -1)
             continue;
+
 #if !defined( SYS_BEOS )
-        else
-        {
-            int i_val;
-
-            /* Increase the receive buffer size to 1/2MB (8Mb/s during 1/2s)
-             * to avoid packet loss caused by scheduling problems */
-            i_val = 0x80000;
-            setsockopt( fd, SOL_SOCKET, SO_RCVBUF, (void *)&i_val,
-                        sizeof( i_val ) );
-            i_val = 0x80000;
-            setsockopt( fd, SOL_SOCKET, SO_SNDBUF, (void *)&i_val,
-                        sizeof( i_val ) );
-
-            /* Allow broadcast sending */
-            i_val = 1;
-            setsockopt( fd, SOL_SOCKET, SO_BROADCAST, (void*)&i_val,
-                        sizeof( i_val ) );
-        }
+        /* Increase the receive buffer size to 1/2MB (8Mb/s during 1/2s)
+        * to avoid packet loss caused by scheduling problems */
+        setsockopt (fd, SOL_SOCKET, SO_RCVBUF, &(int){ 0x80000 }, sizeof (int));
+        setsockopt (fd, SOL_SOCKET, SO_SNDBUF, &(int){ 0x80000 }, sizeof (int));
+
+        /* Allow broadcast sending */
+        setsockopt (fd, SOL_SOCKET, SO_BROADCAST, &(int){ 1 }, sizeof (int));
 #endif
 
         if( i_hlim > 0 )
             net_SetMcastHopLimit( p_this, fd, ptr->ai_family, i_hlim );
-        psz_mif = config_GetPsz( p_this, (ptr->ai_family != AF_INET)
-                                            ? "miface" : "miface-addr" );
-        if( psz_mif != NULL )
+
+        str = var_CreateGetString (p_this, "miface");
+        if (str != NULL)
+        {
+            net_SetMcastOut (p_this, fd, ptr->ai_family, str, NULL);
+            free (str);
+        }
+
+        str = var_CreateGetString (p_this, "miface-addr");
+        if (str != NULL)
         {
-            net_SetMcastIface( p_this, fd, ptr->ai_family, psz_mif );
-            free( psz_mif );
+            net_SetMcastOut (p_this, fd, ptr->ai_family, NULL, str);
+            free (str);
         }
 
+        net_SetDSCP (fd, var_CreateGetInteger (p_this, "dscp"));
+
         if( connect( fd, ptr->ai_addr, ptr->ai_addrlen ) == 0 )
         {
             /* success */