]> git.sesse.net Git - vlc/blobdiff - src/stream_output/sap.c
Restore some kind of SAP support
[vlc] / src / stream_output / sap.c
index 1ba969e641008eea9b5a0b578d5746ead646e7d9..573b88d34df740785caed7a61b113ca5eb38b899 100644 (file)
@@ -1,10 +1,11 @@
 /*****************************************************************************
  * sap.c : SAP announce handler
  *****************************************************************************
- * Copyright (C) 2002-2004 VideoLAN
+ * Copyright (C) 2002-2005 the VideoLAN team
  * $Id$
  *
- * Authors: Clément Stenac <zorglub@videolan.org>
+ * Authors: Clément Stenac <zorglub@videolan.org>
+ *          Rémi Denis-Courmont <rem # videolan.org>
  *
  * 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
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  *****************************************************************************/
 
 /*****************************************************************************
  * Preamble
  *****************************************************************************/
+
+#include <vlc/vlc.h>
+
 #include <stdlib.h>                                                /* free() */
 #include <stdio.h>                                              /* sprintf() */
 #include <string.h>                                            /* strerror() */
+#include <ctype.h>                                  /* tolower(), isxdigit() */
 
-#include <vlc/vlc.h>
-#include <vlc/sout.h>
+#include <vlc_sout.h>
+#include <vlc_network.h>
+#include <vlc_charset.h>
 
-#include <network.h>
+#include "stream_output.h"
 
-#define SAP_IPV4_ADDR "224.2.127.254" /* Standard port and address for SAP */
+/* SAP is always on that port */
 #define SAP_PORT 9875
 
-#define SAP_IPV6_ADDR_1 "FF0"
-#define SAP_IPV6_ADDR_2 "::2:7FFE"
-
-#define DEFAULT_IPV6_SCOPE '8'
-
 #define DEFAULT_PORT "1234"
 
 #undef EXTRA_DEBUG
 
+/* SAP Specific structures */
+
+/* 100ms */
+#define SAP_IDLE ((mtime_t)(0.100*CLOCK_FREQ))
+#define SAP_MAX_BUFFER 65534
+#define MIN_INTERVAL 2
+#define MAX_INTERVAL 300
+
+/* A SAP announce address. For each of these, we run the
+ * control flow algorithm */
+struct sap_address_t
+{
+    char *psz_address;
+    struct sockaddr_storage orig;
+    socklen_t origlen;
+    int i_rfd; /* Read socket */
+    int i_wfd; /* Write socket */
+
+    /* Used for flow control */
+    mtime_t t1;
+    vlc_bool_t b_enabled;
+    vlc_bool_t b_ready;
+    int i_interval;
+    int i_buff;
+    int i_limit;
+};
+
+/* A SAP session descriptor, enqueued in the SAP handler queue */
+struct sap_session_t {
+    uint8_t       *psz_data;
+    unsigned      i_length;
+    sap_address_t *p_address;
+    session_descriptor_t *p_sd;
+
+    /* Last and next send */
+    mtime_t        i_last;
+    mtime_t        i_next;
+};
+
 /*****************************************************************************
  * Local prototypes
  *****************************************************************************/
 static void RunThread( vlc_object_t *p_this);
 static int CalculateRate( sap_handler_t *p_sap, sap_address_t *p_address );
-static int SDPGenerate( sap_handler_t *p_sap, session_descriptor_t *p_session );
+static char *SDPGenerate( sap_handler_t *p_sap,
+                          const session_descriptor_t *p_session,
+                          const sap_address_t *p_addr, vlc_bool_t b_ssm );
 
 static int announce_SendSAPAnnounce( sap_handler_t *p_sap,
                                      sap_session_t *p_session );
 
 
 static int announce_SAPAnnounceAdd( sap_handler_t *p_sap,
-                             session_descriptor_t *p_session,
-                             announce_method_t *p_method );
+                             session_descriptor_t *p_session );
 
 static int announce_SAPAnnounceDel( sap_handler_t *p_sap,
                              session_descriptor_t *p_session );
 
-#define FREE( p ) if( p ) { free( p ); (p) = NULL; }
-
 
 /**
  * Create the SAP handler
@@ -98,7 +137,7 @@ sap_handler_t *announce_SAPHandlerCreate( announce_handler_t *p_announce )
     if( vlc_thread_create( p_sap, "sap handler", RunThread,
                        VLC_THREAD_PRIORITY_LOW, VLC_FALSE ) )
     {
-        msg_Dbg( p_announce, "Unable to spawn SAP handler thread");
+        msg_Dbg( p_announce, "unable to spawn SAP handler thread");
         free( p_sap );
         return NULL;
     };
@@ -121,17 +160,16 @@ void announce_SAPHandlerDestroy( sap_handler_t *p_sap )
     for( i = 0 ; i< p_sap->i_sessions ; i++)
     {
         sap_session_t *p_session = p_sap->pp_sessions[i];
-        FREE( p_session->psz_sdp );
-        FREE( p_session->psz_data );
+        FREENULL( p_session->psz_data );
         REMOVE_ELEM( p_sap->pp_sessions, p_sap->i_sessions , i );
-        FREE( p_session );
+        FREENULL( p_session );
     }
 
     /* Free the remaining addresses */
     for( i = 0 ; i< p_sap->i_addresses ; i++)
     {
         sap_address_t *p_address = p_sap->pp_addresses[i];
-        FREE( p_address->psz_address );
+        FREENULL( p_address->psz_address );
         if( p_address->i_rfd > -1 )
         {
             net_Close( p_address->i_rfd );
@@ -141,7 +179,7 @@ void announce_SAPHandlerDestroy( sap_handler_t *p_sap )
             net_Close( p_address->i_wfd );
         }
         REMOVE_ELEM( p_sap->pp_addresses, p_sap->i_addresses, i );
-        FREE( p_address );
+        FREENULL( p_address );
     }
 
     /* Free the structure */
@@ -206,93 +244,154 @@ static void RunThread( vlc_object_t *p_this)
 
 /* Add a SAP announce */
 static int announce_SAPAnnounceAdd( sap_handler_t *p_sap,
-                             session_descriptor_t *p_session,
-                             announce_method_t *p_method )
+                             session_descriptor_t *p_session )
 {
     int i;
-    char *psz_type = "application/sdp";
-    int i_header_size;
-    char *psz_head;
-    vlc_bool_t b_found = VLC_FALSE;
+    char psz_addr[NI_MAXNUMERICHOST];
+    vlc_bool_t b_ipv6 = VLC_FALSE, b_ssm = VLC_FALSE;
     sap_session_t *p_sap_session;
     mtime_t i_hash;
+    struct sockaddr_storage addr;
+    socklen_t addrlen;
 
     vlc_mutex_lock( &p_sap->object_lock );
-
-    /* If needed, build the SDP */
-    if( !p_session->psz_sdp )
+    addrlen = p_session->addrlen;
+    if ((addrlen == 0) || (addrlen > sizeof (addr)))
     {
-        if ( SDPGenerate( p_sap, p_session ) != VLC_SUCCESS )
-        {
-            vlc_mutex_unlock( &p_sap->object_lock );
-            return VLC_EGENERIC;
-        }
+        vlc_mutex_unlock( &p_sap->object_lock );
+        msg_Err( p_sap, "No/invalid address specified for SAP announce" );
+        return VLC_EGENERIC;
     }
 
-    if( !p_method->psz_address )
+    /* Determine SAP multicast address automatically */
+    memcpy (&addr, &p_session->addr, addrlen);
+
+    switch( p_session->addr.ss_family )
     {
-        if( p_method->i_ip_version == 6 )
+#if defined (HAVE_INET_PTON) || defined (WIN32)
+        case AF_INET6:
         {
-            char sz_scope;
-            if( p_method->psz_ipv6_scope != NULL )
+            /* See RFC3513 for list of valid IPv6 scopes */
+            struct in6_addr *a6 = &((struct sockaddr_in6 *)&addr)->sin6_addr;
+
+            memcpy( a6->s6_addr + 2, "\x00\x00\x00\x00\x00\x00"
+                   "\x00\x00\x00\x00\x00\x02\x7f\xfe", 14 );
+            if( IN6_IS_ADDR_MULTICAST( a6 ) )
             {
-                sz_scope = *p_method->psz_ipv6_scope;
+                /* SSM <=> ff3x::/32 */
+                b_ssm = (U32_AT (a6->s6_addr) & 0xfff0ffff) == 0xff300000;
+
+                /* force flags to zero, preserve scope */
+                a6->s6_addr[1] &= 0xf;
             }
             else
-            {
-                sz_scope = DEFAULT_IPV6_SCOPE;
-            }
-            p_method->psz_address = (char*)malloc( 30*sizeof(char ));
-            sprintf( p_method->psz_address, "%s%c%s",
-                            SAP_IPV6_ADDR_1, sz_scope, SAP_IPV6_ADDR_2 );
+                /* Unicast IPv6 - assume global scope */
+                memcpy( a6->s6_addr, "\xff\x0e", 2 );
+
+            b_ipv6 = VLC_TRUE;
+            break;
         }
-        else
+#endif
+
+        case AF_INET:
         {
-            /* IPv4 */
-            p_method->psz_address = (char*)malloc( 15*sizeof(char) );
-            snprintf(p_method->psz_address, 15, SAP_IPV4_ADDR );
+            /* See RFC2365 for IPv4 scopes */
+            uint32_t ipv4;
+
+            ipv4 = ntohl( ((struct sockaddr_in *)&addr)->sin_addr.s_addr );
+            /* 224.0.0.0/24 => 224.0.0.255 */
+            if ((ipv4 & 0xffffff00) == 0xe0000000)
+                ipv4 =  0xe00000ff;
+            else
+            /* 239.255.0.0/16 => 239.255.255.255 */
+            if ((ipv4 & 0xffff0000) == 0xefff0000)
+                ipv4 =  0xefffffff;
+            else
+            /* 239.192.0.0/14 => 239.195.255.255 */
+            if ((ipv4 & 0xfffc0000) == 0xefc00000)
+                ipv4 =  0xefc3ffff;
+            else
+            if ((ipv4 & 0xff000000) == 0xef000000)
+                ipv4 = 0;
+            else
+            /* other addresses => 224.2.127.254 */
+            {
+                /* SSM: 232.0.0.0/8 */
+                b_ssm = (ipv4 >> 24) == 232;
+                ipv4 = 0xe0027ffe;
+            }
+
+            /* FIXME FIXME FIXME */
+            if( ipv4 == 0 )
+            {
+                msg_Err( p_sap, "Out-of-scope multicast address "
+                         "not supported by SAP" );
+                vlc_mutex_unlock( &p_sap->object_lock );
+                return VLC_EGENERIC;
+            }
+
+            ((struct sockaddr_in *)&addr)->sin_addr.s_addr = htonl( ipv4 );
+            break;
         }
+
+        default:
+            vlc_mutex_unlock( &p_sap->object_lock );
+            msg_Err( p_sap, "Address family %d not supported by SAP",
+                     addr.ss_family );
+            return VLC_EGENERIC;
     }
-    msg_Dbg( p_sap, "using SAP address: %s",p_method->psz_address);
+
+    i = vlc_getnameinfo( (struct sockaddr *)&addr, addrlen,
+                         psz_addr, sizeof( psz_addr ), NULL, NI_NUMERICHOST );
+
+    if( i )
+    {
+        vlc_mutex_unlock( &p_sap->object_lock );
+        msg_Err( p_sap, "%s", vlc_gai_strerror( i ) );
+        return VLC_EGENERIC;
+    }
+
+    msg_Dbg( p_sap, "using SAP address: %s", psz_addr);
 
     /* XXX: Check for dupes */
     p_sap_session = (sap_session_t*)malloc(sizeof(sap_session_t));
-
-    p_sap_session->psz_sdp = strdup( p_session->psz_sdp );
-    p_sap_session->i_last = 0;
+    p_sap_session->p_sd = p_session;
+    p_sap_session->p_address = NULL;
 
     /* Add the address to the buffer */
-    for( i = 0; i< p_sap->i_addresses; i++)
+    for( i = 0; i < p_sap->i_addresses; i++)
     {
-        if( !strcmp( p_method->psz_address,
-             p_sap->pp_addresses[i]->psz_address ) )
+        if( !strcmp( psz_addr, p_sap->pp_addresses[i]->psz_address ) )
         {
             p_sap_session->p_address = p_sap->pp_addresses[i];
-            b_found = VLC_TRUE;
             break;
         }
     }
-    if( b_found == VLC_FALSE )
+
+    if( p_sap_session->p_address == NULL )
     {
         sap_address_t *p_address = (sap_address_t *)
                                     malloc( sizeof(sap_address_t) );
         if( !p_address )
         {
-            msg_Err( p_sap, "out of memory" );
+            vlc_mutex_unlock( &p_sap->object_lock );
             return VLC_ENOMEM;
         }
-        p_address->psz_address = strdup( p_method->psz_address );
-        p_address->i_ip_version = p_method->i_ip_version;
-        p_address->i_port  =  9875;
-        p_address->i_wfd = net_OpenUDP( p_sap, "", 0,
-                                        p_address->psz_address,
-                                        p_address->i_port );
+        p_address->psz_address = strdup( psz_addr );
+        p_address->i_wfd = net_ConnectUDP( VLC_OBJECT(p_sap), psz_addr, SAP_PORT, 255 );
+        if( p_address->i_wfd != -1 )
+        {
+            net_StopRecv( p_address->i_wfd );
+            p_address->origlen = sizeof (p_address->orig);
+            getsockname (p_address->i_wfd, (struct sockaddr *)&p_address->orig,
+                         &p_address->origlen);
+        }
 
         if( p_sap->b_control == VLC_TRUE )
         {
-            p_address->i_rfd = net_OpenUDP( p_sap, p_method->psz_address,
-                                            p_address->i_port,
-                                            "", 0 );
+            p_address->i_rfd = net_ListenUDP1( (vlc_object_t*)p_sap, psz_addr, SAP_PORT );
+            if( p_address->i_rfd != -1 )
+                net_StopSend( p_address->i_rfd );
             p_address->i_buff = 0;
             p_address->b_enabled = VLC_TRUE;
             p_address->b_ready = VLC_FALSE;
@@ -304,6 +403,7 @@ static int announce_SAPAnnounceAdd( sap_handler_t *p_sap,
             p_address->b_enabled = VLC_TRUE;
             p_address->b_ready = VLC_TRUE;
             p_address->i_interval = config_GetInt( p_sap,"sap-interval");
+            p_address->i_rfd = -1;
         }
 
         if( p_address->i_wfd == -1 || (p_address->i_rfd == -1
@@ -320,85 +420,100 @@ static int announce_SAPAnnounceAdd( sap_handler_t *p_sap,
         p_sap_session->p_address = p_address;
     }
 
-    /* Build the SAP Headers */
-    i_header_size = ( p_method->i_ip_version == 6 ? 20 : 8 ) + strlen( psz_type ) + 1;
-    psz_head = (char *) malloc( i_header_size * sizeof( char ) );
-    if( ! psz_head )
+    if (p_session->origlen == 0)
+        memcpy (&p_session->orig, &p_sap_session->p_address->orig,
+                p_session->origlen = p_sap_session->p_address->origlen);
+
+    size_t headsize = 20;
+    switch (p_session->orig.ss_family)
+    {
+#ifdef AF_INET6
+        case AF_INET6:
+            headsize += 16;
+            break;
+#endif
+        case AF_INET:
+            headsize =+ 4;
+            break;
+        default:
+            msg_Err( p_sap, "Address family %d not supported by SAP",
+                     addr.ss_family );
+            vlc_mutex_unlock( &p_sap->object_lock );
+            return VLC_EGENERIC;
+    }
+
+    /* If needed, build the SDP */
+    if( p_session->psz_sdp == NULL )
     {
-        msg_Err( p_sap, "out of memory" );
+        p_session->psz_sdp = SDPGenerate( p_sap, p_session,
+                                          p_sap_session->p_address, b_ssm );
+        if( p_session->psz_sdp == NULL )
+        {
+            vlc_mutex_unlock( &p_sap->object_lock );
+            return VLC_ENOMEM;
+        }
+    }
+
+    p_sap_session->i_last = 0;
+    p_sap_session->i_length = headsize + strlen (p_session->psz_sdp);
+    p_sap_session->psz_data = malloc (p_sap_session->i_length + 1);
+    if (p_sap_session->psz_data == NULL)
+    {
+        free (p_session->psz_sdp);
+        vlc_mutex_unlock( &p_sap->object_lock );
         return VLC_ENOMEM;
     }
 
-    psz_head[0] = 0x20; /* Means SAPv1, IPv4, not encrypted, not compressed */
+    /* Build the SAP Headers */
+    uint8_t *psz_head = p_sap_session->psz_data;
+
+    /* SAPv1, not encrypted, not compressed */
+    psz_head[0] = 0x20;
     psz_head[1] = 0x00; /* No authentification length */
 
     i_hash = mdate();
-    psz_head[2] = (i_hash & 0xFF00) >> 8; /* Msg id hash */
-    psz_head[3] = (i_hash & 0xFF);        /* Msg id hash 2 */
+    psz_head[2] = i_hash >> 8; /* Msg id hash */
+    psz_head[3] = i_hash;      /* Msg id hash 2 */
 
-    if( p_method->i_ip_version == 6 )
+    headsize = 4;
+    switch (p_session->orig.ss_family)
     {
-        /* in_addr_t ip_server = inet_addr( ip ); */
-        psz_head[0] |= 0x10; /* Set IPv6 */
-
-        psz_head[4] = 0x01; /* Source IP  FIXME: we should get the real address */
-        psz_head[5] = 0x02; /* idem */
-        psz_head[6] = 0x03; /* idem */
-        psz_head[7] = 0x04; /* idem */
-
-        psz_head[8] = 0x01; /* Source IP  FIXME: we should get the real address */
-        psz_head[9] = 0x02; /* idem */
-        psz_head[10] = 0x03; /* idem */
-        psz_head[11] = 0x04; /* idem */
-
-        psz_head[12] = 0x01; /* Source IP  FIXME: we should get the real address */
-        psz_head[13] = 0x02; /* idem */
-        psz_head[14] = 0x03; /* idem */
-        psz_head[15] = 0x04; /* idem */
-
-        psz_head[16] = 0x01; /* Source IP  FIXME: we should get the real address */
-        psz_head[17] = 0x02; /* idem */
-        psz_head[18] = 0x03; /* idem */
-        psz_head[19] = 0x04; /* idem */
-
-        strncpy( psz_head + 20, psz_type, 15 );
-    }
-    else
-    {
-        /* in_addr_t ip_server = inet_addr( ip) */
-        /* Source IP  FIXME: we should get the real address */
-        psz_head[4] = 0x01; /* ip_server */
-        psz_head[5] = 0x02; /* ip_server>>8 */
-        psz_head[6] = 0x03; /* ip_server>>16 */
-        psz_head[7] = 0x04; /* ip_server>>24 */
-
-        strncpy( psz_head + 8, psz_type, 15 );
-    }
+#ifdef AF_INET6
+        case AF_INET6:
+        {
+            struct in6_addr *a6 =
+                &((struct sockaddr_in6 *)&p_session->orig)->sin6_addr;
+            memcpy (psz_head + headsize, a6, 16);
+            psz_head[0] |= 0x10; /* IPv6 flag */
+            headsize += 16;
+            break;
+        }
+#endif
+        case AF_INET:
+        {
+            uint32_t ipv4 =
+                (((struct sockaddr_in *)&p_session->orig)->sin_addr.s_addr);
+            memcpy (psz_head + headsize, &ipv4, 4);
+            headsize += 4;
+            break;
+        }
 
-    psz_head[ i_header_size-1 ] = '\0';
-    p_sap_session->i_length = i_header_size + strlen( p_sap_session->psz_sdp);
+    }
 
-    p_sap_session->psz_data = (char *)malloc( sizeof(char)*
-                                              p_sap_session->i_length );
+    memcpy (psz_head + headsize, "application/sdp", 16);
+    headsize += 16;
 
     /* Build the final message */
-    memcpy( p_sap_session->psz_data, psz_head, i_header_size );
-    memcpy( p_sap_session->psz_data+i_header_size, p_sap_session->psz_sdp,
-            strlen( p_sap_session->psz_sdp) );
-
-    free( psz_head );
+    strcpy( (char *)psz_head + headsize, p_session->psz_sdp);
 
     /* Enqueue the announce */
     INSERT_ELEM( p_sap->pp_sessions,
                  p_sap->i_sessions,
                  p_sap->i_sessions,
                  p_sap_session );
-    msg_Dbg( p_sap,"Addresses: %i  Sessions: %i",
+    msg_Dbg( p_sap,"%i addresses, %i sessions",
                    p_sap->i_addresses,p_sap->i_sessions);
 
-    /* Remember the SAP session for later deletion */
-    p_session->p_sap = p_sap_session;
-
     vlc_mutex_unlock( &p_sap->object_lock );
 
     return VLC_SUCCESS;
@@ -411,16 +526,20 @@ static int announce_SAPAnnounceDel( sap_handler_t *p_sap,
     int i;
     vlc_mutex_lock( &p_sap->object_lock );
 
-    msg_Dbg( p_sap,"removing SAP announce %p",p_session->p_sap);
+    msg_Dbg( p_sap, "removing session %p from SAP", p_session);
 
     /* Dequeue the announce */
     for( i = 0; i< p_sap->i_sessions; i++)
     {
-        if( p_session->p_sap == p_sap->pp_sessions[i] )
+        if( p_session == p_sap->pp_sessions[i]->p_sd )
         {
+            sap_session_t *p_mysession = p_sap->pp_sessions[i];
             REMOVE_ELEM( p_sap->pp_sessions,
                          p_sap->i_sessions,
                          i );
+
+            free( p_mysession->psz_data );
+            free( p_mysession );
             break;
         }
     }
@@ -429,7 +548,7 @@ static int announce_SAPAnnounceDel( sap_handler_t *p_sap,
      * TODO: - address refcount
              - send a SAP deletion packet */
 
-    msg_Dbg( p_sap,"%i announces remaining", p_sap->i_sessions );
+    msg_Dbg( p_sap,"%i announcements remaining", p_sap->i_sessions );
 
     vlc_mutex_unlock( &p_sap->object_lock );
 
@@ -452,16 +571,16 @@ static int announce_SendSAPAnnounce( sap_handler_t *p_sap,
     if( p_session->i_next < mdate() )
     {
 #ifdef EXTRA_DEBUG
-        msg_Dbg( p_sap, "Sending announce");
+        msg_Dbg( p_sap, "sending announce");
 #endif
-        i_ret = net_Write( p_sap, p_session->p_address->i_wfd,
+        i_ret = net_Write( p_sap, p_session->p_address->i_wfd, NULL,
                            p_session->psz_data,
                            p_session->i_length );
-        if( i_ret  != p_session->i_length )
+        if( i_ret != (int)p_session->i_length )
         {
             msg_Warn( p_sap, "SAP send failed on address %s (%i %i)",
-                   p_session->p_address->psz_address,
-                   i_ret, p_session->i_length );
+                      p_session->p_address->psz_address,
+                      i_ret, p_session->i_length );
         }
         p_session->i_last = p_session->i_next;
         p_session->i_next = p_session->i_last
@@ -474,61 +593,59 @@ static int announce_SendSAPAnnounce( sap_handler_t *p_sap,
     return VLC_SUCCESS;
 }
 
-static int SDPGenerate( sap_handler_t *p_sap, session_descriptor_t *p_session )
+static char *SDPGenerate( sap_handler_t *p_sap,
+                          const session_descriptor_t *p_session,
+                          const sap_address_t *p_addr, vlc_bool_t b_ssm )
 {
-    int64_t i_sdp_id = mdate();
-    int     i_sdp_version = 1 + p_sap->i_sessions + (rand()&0xfff);
-
-    /* see the lists in modules/stream_out/rtp.c for compliance stuff */
-    p_session->psz_sdp = (char *)malloc(
-                            sizeof("v=0\r\n"
-                                   "o=- 45383436098 45398  IN IP4 127.0.0.1\r\n" /* FIXME */
-                                   "s=\r\n"
-                                   "t=0 0\r\n"
-                                   "c=IN IP4 /\r\n"
-                                   "m=video  udp\r\n"
-                                   "a=tool:"PACKAGE_STRING"\r\n"
-                                   "a=type:broadcast\r\n")
-                           + strlen( p_session->psz_name )
-                           + strlen( p_session->psz_uri ) + 300
-                           + ( p_session->psz_group ?
-                                 strlen( p_session->psz_group ) : 0 ) );
-
-    if( !p_session->psz_sdp )
-    {
-        msg_Err( p_sap, "out of memory" );
-        return VLC_ENOMEM;
-    }
-    sprintf( p_session->psz_sdp,
-                            "v=0\r\n"
-                            "o=- "I64Fd" %d IN IP4 127.0.0.1\r\n"
-                            "s=%s\r\n"
-                            "t=0 0\r\n"
-                            "c=IN IP4 %s/%d\r\n"
-                            "m=video %d udp %d\r\n"
-                            "a=tool:"PACKAGE_STRING"\r\n"
-                            "a=type:broadcast\r\n",
-                            i_sdp_id, i_sdp_version,
-                            p_session->psz_name,
-                            p_session->psz_uri, p_session->i_ttl,
-                            p_session->i_port, p_session->i_payload );
-
-    if( p_session->psz_group )
-    {
-        sprintf( p_session->psz_sdp, "%sa=x-plgroup:%s\r\n",
-                                     p_session->psz_sdp,
-                                     p_session->psz_group );
-    }
+    char *psz_group, *psz_name, *psz_sdp;
 
-    msg_Dbg( p_sap, "Generated SDP (%i bytes):\n%s", strlen(p_session->psz_sdp),
-                    p_session->psz_sdp );
-    return VLC_SUCCESS;
+     char *head = StartSDP (p_session->psz_name, p_session->description,
+        p_session->url, p_session->email, p_session->phone,
+        (const struct sockaddr *)&p_session->orig, p_session->origlen,
+        (const struct sockaddr *)&p_session->addr, p_session->addrlen);
+    if (head == NULL)
+        return NULL;
+
+    psz_group = p_session->psz_group;
+    psz_name = p_session->psz_name;
+
+    char *plgroup;
+    if ((psz_group == NULL)
+     || (asprintf (&plgroup, "a=x-plgroup:%s\r\n", psz_group) == -1))
+        plgroup = NULL;
+
+    char *sfilter;
+#if 0
+    if ((!b_ssm)
+     || (asprintf (&sfilter, "a=source-filter: incl IN IP%c * %s\r\n",
+                   ipv, p_addr->psz_machine) == -1))
+#else
+# warning FIXME: repair Source Specific Multicast
+#endif
+        sfilter = NULL;
+
+    int res = asprintf (&psz_sdp, "%s" "%s" "%s"
+                        "m=video %d %s\r\n",
+                        head,
+                        plgroup ?: "",
+                        sfilter ?: "",
+                        net_GetPort ((const struct sockaddr *)&p_session->addr),
+                        p_session->sdpformat);
+    free (plgroup);
+    free (sfilter);
+
+    if (res == -1)
+        return NULL;
+
+    msg_Dbg( p_sap, "Generated SDP (%i bytes):\n%s", strlen(psz_sdp),
+             psz_sdp );
+    return psz_sdp;
 }
 
 static int CalculateRate( sap_handler_t *p_sap, sap_address_t *p_address )
 {
     int i_read;
-    char buffer[SAP_MAX_BUFFER];
+    uint8_t buffer[SAP_MAX_BUFFER];
     int i_tot = 0;
     mtime_t i_temp;
     int i_rate;
@@ -541,10 +658,10 @@ static int CalculateRate( sap_handler_t *p_sap, sap_address_t *p_address )
     do
     {
         /* Might be too slow if we have huge data */
-        i_read = net_ReadNonBlock( p_sap, p_address->i_rfd, buffer,
+        i_read = net_ReadNonBlock( p_sap, p_address->i_rfd, NULL, buffer,
                                    SAP_MAX_BUFFER, 0 );
         i_tot += i_read;
-    } while( i_read > 0 && i_tot < SAP_MAX_BUFFER );
+    } while( i_read > 0 );
 
     i_temp = mdate();
 
@@ -569,10 +686,8 @@ static int CalculateRate( sap_handler_t *p_sap, sap_address_t *p_address )
         p_address->i_interval = MAX_INTERVAL;
     }
 #ifdef EXTRA_DEBUG
-    msg_Dbg( p_sap,"%s:%i : Rate=%i, Interval = %i s",
-                    p_address->psz_address,p_address->i_port,
-                    i_rate,
-                    p_address->i_interval );
+    msg_Dbg( p_sap,"%s:%i: rate=%i, interval = %i s",
+             p_address->psz_address,SAP_PORT, i_rate, p_address->i_interval );
 #endif
 
     p_address->b_ready = VLC_TRUE;