git.sesse.net Git - vlc/blob - src/stream_output/sap.c

   1 /*****************************************************************************
   2  * sap.c : SAP announce handler
   3  *****************************************************************************
   4  * Copyright (C) 2002-2005 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Clément Stenac <zorglub@videolan.org>
   8  *          Rémi Denis-Courmont <rem # videolan.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  23  *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28 #include <stdlib.h>                                                /* free() */
  29 #include <stdio.h>                                              /* sprintf() */
  30 #include <string.h>                                            /* strerror() */
  31 #include <ctype.h>                                  /* tolower(), isxdigit() */
  32
  33 #include <vlc/vlc.h>
  34 #include <vlc/sout.h>
  35
  36 #include "network.h"
  37 #if defined( WIN32 ) || defined( UNDER_CE )
  38 #   if defined(UNDER_CE) && defined(sockaddr_storage)
  39 #       undef sockaddr_storage
  40 #   endif
  41 #   include <winsock2.h>
  42 #   include <ws2tcpip.h>
  43 #else
  44 #   include <netdb.h>
  45 #endif
  46 #include "charset.h"
  47
  48 /* SAP is always on that port */
  49 #define SAP_PORT 9875
  50
  51 #define DEFAULT_PORT "1234"
  52
  53 #undef EXTRA_DEBUG
  54
  55 /* SAP Specific structures */
  56
  57 /* 100ms */
  58 #define SAP_IDLE ((mtime_t)(0.100*CLOCK_FREQ))
  59 #define SAP_MAX_BUFFER 65534
  60 #define MIN_INTERVAL 2
  61 #define MAX_INTERVAL 300
  62
  63 /* A SAP announce address. For each of these, we run the
  64  * control flow algorithm */
  65 struct sap_address_t
  66 {
  67     char *psz_address;
  68     char psz_machine[NI_MAXNUMERICHOST];
  69     int i_port;
  70     int i_rfd; /* Read socket */
  71     int i_wfd; /* Write socket */
  72
  73     /* Used for flow control */
  74     mtime_t t1;
  75     vlc_bool_t b_enabled;
  76     vlc_bool_t b_ready;
  77     int i_interval;
  78     int i_buff;
  79     int i_limit;
  80 };
  81
  82 /*****************************************************************************
  83  * Local prototypes
  84  *****************************************************************************/
  85 static void RunThread( vlc_object_t *p_this);
  86 static int CalculateRate( sap_handler_t *p_sap, sap_address_t *p_address );
  87 static char *SDPGenerate( sap_handler_t *p_sap,
  88                           const session_descriptor_t *p_session,
  89                           const sap_address_t *p_addr );
  90
  91 static int announce_SendSAPAnnounce( sap_handler_t *p_sap,
  92                                      sap_session_t *p_session );
  93
  94
  95 static int announce_SAPAnnounceAdd( sap_handler_t *p_sap,
  96                              session_descriptor_t *p_session );
  97
  98 static int announce_SAPAnnounceDel( sap_handler_t *p_sap,
  99                              session_descriptor_t *p_session );
 100 static char *convert_to_utf8( struct sap_handler_t *p_this, char *psz_local );
 101
 102 #define FREE( p ) if( p ) { free( p ); (p) = NULL; }
 103
 104
 105 /**
 106  * Create the SAP handler
 107  *
 108  * \param p_announce the parent announce_handler
 109  * \return the newly created SAP handler or NULL on error
 110  */
 111 sap_handler_t *announce_SAPHandlerCreate( announce_handler_t *p_announce )
 112 {
 113     sap_handler_t *p_sap;
 114     char *psz_charset;
 115
 116     p_sap = vlc_object_create( p_announce, sizeof( sap_handler_t ) );
 117
 118     if( !p_sap )
 119     {
 120         msg_Err( p_announce, "out of memory" );
 121         return NULL;
 122     }
 123
 124     vlc_mutex_init( p_sap, &p_sap->object_lock );
 125
 126     vlc_current_charset( &psz_charset );
 127     p_sap->iconvHandle = vlc_iconv_open( "UTF-8", psz_charset );
 128     free( psz_charset );
 129     if( p_sap->iconvHandle == (vlc_iconv_t)(-1) )
 130         msg_Warn( p_sap, "Unable to do requested conversion" );
 131
 132     p_sap->pf_add = announce_SAPAnnounceAdd;
 133     p_sap->pf_del = announce_SAPAnnounceDel;
 134
 135     p_sap->i_sessions = 0;
 136     p_sap->i_addresses = 0;
 137     p_sap->i_current_session = 0;
 138
 139     p_sap->b_control = config_GetInt( p_sap, "sap-flow-control");
 140
 141     if( vlc_thread_create( p_sap, "sap handler", RunThread,
 142                        VLC_THREAD_PRIORITY_LOW, VLC_FALSE ) )
 143     {
 144         msg_Dbg( p_announce, "Unable to spawn SAP handler thread");
 145         free( p_sap );
 146         return NULL;
 147     };
 148     msg_Dbg( p_announce, "thread created, %i sessions", p_sap->i_sessions);
 149     return p_sap;
 150 }
 151
 152 /**
 153  *  Destroy the SAP handler
 154  *  \param p_this the SAP Handler to destroy
 155  *  \return nothing
 156  */
 157 void announce_SAPHandlerDestroy( sap_handler_t *p_sap )
 158 {
 159     int i;
 160
 161     vlc_mutex_destroy( &p_sap->object_lock );
 162
 163     /* Free the remaining sessions */
 164     for( i = 0 ; i< p_sap->i_sessions ; i++)
 165     {
 166         sap_session_t *p_session = p_sap->pp_sessions[i];
 167         FREE( p_session->psz_sdp );
 168         FREE( p_session->psz_data );
 169         REMOVE_ELEM( p_sap->pp_sessions, p_sap->i_sessions , i );
 170         FREE( p_session );
 171     }
 172
 173     /* Free the remaining addresses */
 174     for( i = 0 ; i< p_sap->i_addresses ; i++)
 175     {
 176         sap_address_t *p_address = p_sap->pp_addresses[i];
 177         FREE( p_address->psz_address );
 178         if( p_address->i_rfd > -1 )
 179         {
 180             net_Close( p_address->i_rfd );
 181         }
 182         if( p_address->i_wfd > -1 && p_sap->b_control )
 183         {
 184             net_Close( p_address->i_wfd );
 185         }
 186         REMOVE_ELEM( p_sap->pp_addresses, p_sap->i_addresses, i );
 187         FREE( p_address );
 188     }
 189
 190     if( p_sap->iconvHandle != (vlc_iconv_t)(-1) )
 191         vlc_iconv_close( p_sap->iconvHandle );
 192
 193     /* Free the structure */
 194     vlc_object_destroy( p_sap );
 195 }
 196
 197 /**
 198  * main SAP handler thread
 199  * \param p_this the SAP Handler object
 200  * \return nothing
 201  */
 202 static void RunThread( vlc_object_t *p_this)
 203 {
 204     sap_handler_t *p_sap = (sap_handler_t*)p_this;
 205     sap_session_t *p_session;
 206
 207     while( !p_sap->b_die )
 208     {
 209         int i;
 210
 211         /* If needed, get the rate info */
 212         if( p_sap->b_control == VLC_TRUE )
 213         {
 214             for( i = 0 ; i< p_sap->i_addresses ; i++)
 215             {
 216                 if( p_sap->pp_addresses[i]->b_enabled == VLC_TRUE )
 217                 {
 218                     CalculateRate( p_sap, p_sap->pp_addresses[i] );
 219                 }
 220             }
 221         }
 222
 223         /* Find the session to announce */
 224         vlc_mutex_lock( &p_sap->object_lock );
 225         if( p_sap->i_sessions > p_sap->i_current_session + 1)
 226         {
 227             p_sap->i_current_session++;
 228         }
 229         else if( p_sap->i_sessions > 0)
 230         {
 231             p_sap->i_current_session = 0;
 232         }
 233         else
 234         {
 235             vlc_mutex_unlock( &p_sap->object_lock );
 236             msleep( SAP_IDLE );
 237             continue;
 238         }
 239         p_session = p_sap->pp_sessions[p_sap->i_current_session];
 240         vlc_mutex_unlock( &p_sap->object_lock );
 241
 242         /* And announce it */
 243         if( p_session->p_address->b_enabled == VLC_TRUE &&
 244             p_session->p_address->b_ready == VLC_TRUE )
 245         {
 246             announce_SendSAPAnnounce( p_sap, p_session );
 247         }
 248
 249         msleep( SAP_IDLE );
 250     }
 251 }
 252
 253 /* Add a SAP announce */
 254 static int announce_SAPAnnounceAdd( sap_handler_t *p_sap,
 255                              session_descriptor_t *p_session )
 256 {
 257     int i_header_size, i;
 258     char *psz_head, psz_addr[NI_MAXNUMERICHOST];
 259     vlc_bool_t b_ipv6 = VLC_FALSE;
 260     sap_session_t *p_sap_session;
 261     mtime_t i_hash;
 262     struct addrinfo hints, *res;
 263     struct sockaddr_storage addr;
 264
 265     vlc_mutex_lock( &p_sap->object_lock );
 266
 267     if( p_session->psz_uri == NULL )
 268     {
 269         vlc_mutex_unlock( &p_sap->object_lock );
 270         msg_Err( p_sap, "*FIXME* Unexpected NULL URI for SAP announce" );
 271         msg_Err( p_sap, "This should not happen. VLC needs fixing." );
 272         return VLC_EGENERIC;
 273     }
 274
 275     /* Determine SAP multicast address automatically */
 276     memset( &hints, 0, sizeof( hints ) );
 277     hints.ai_socktype = SOCK_DGRAM;
 278     hints.ai_flags = AI_NUMERICHOST;
 279
 280     i = vlc_getaddrinfo( (vlc_object_t *)p_sap, p_session->psz_uri, 0,
 281                          &hints, &res );
 282     if( i )
 283     {
 284         vlc_mutex_unlock( &p_sap->object_lock );
 285         msg_Err( p_sap, "Invalid URI for SAP announce: %s: %s",
 286                  p_session->psz_uri, vlc_gai_strerror( i ) );
 287         return VLC_EGENERIC;
 288     }
 289
 290     if( (unsigned)res->ai_addrlen > sizeof( addr ) )
 291     {
 292         vlc_mutex_unlock( &p_sap->object_lock );
 293         vlc_freeaddrinfo( res );
 294         msg_Err( p_sap, "Unsupported address family of size %d > %u",
 295                  res->ai_addrlen, sizeof( addr ) );
 296         return VLC_EGENERIC;
 297     }
 298
 299     memcpy( &addr, res->ai_addr, res->ai_addrlen );
 300
 301     switch( addr.ss_family )
 302     {
 303 #if defined (HAVE_GETADDRINFO) || defined (WIN32)
 304         case AF_INET6:
 305         {
 306             /* See RFC3513 for list of valid IPv6 scopes */
 307             struct in6_addr *a6 = &((struct sockaddr_in6 *)&addr)->sin6_addr;
 308
 309             memcpy( a6->s6_addr + 2, "\x00\x00\x00\x00\x00\x00"
 310                    "\x00\x00\x00\x00\x00\x02\x7f\xfe", 14 );
 311             if( IN6_IS_ADDR_MULTICAST( a6 ) )
 312                  /* force flags to zero, preserve scope */
 313                 a6->s6_addr[1] &= 0xf;
 314             else
 315                 /* Unicast IPv6 - assume global scope */
 316                 memcpy( a6->s6_addr, "\xff\x0e", 2 );
 317
 318             b_ipv6 = VLC_TRUE;
 319             break;
 320         }
 321 #endif
 322
 323         case AF_INET:
 324         {
 325             /* See RFC2365 for IPv4 scopes */
 326             uint32_t ipv4;
 327
 328             ipv4 = ntohl( ((struct sockaddr_in *)&addr)->sin_addr.s_addr );
 329             /* 224.0.0.0/24 => 224.0.0.255 */
 330             if ((ipv4 & 0xffffff00) == 0xe0000000)
 331                 ipv4 =  0xe00000ff;
 332             else
 333             /* 239.255.0.0/16 => 239.255.255.255 */
 334             if ((ipv4 & 0xffff0000) == 0xefff0000)
 335                 ipv4 =  0xefffffff;
 336             else
 337             /* 239.192.0.0/14 => 239.195.255.255 */
 338             if ((ipv4 & 0xfffc0000) == 0xefc00000)
 339                 ipv4 =  0xefc3ffff;
 340             else
 341             /* other addresses => 224.2.127.254 */
 342                 ipv4 = 0xe0027ffe;
 343             break;
 344         }
 345
 346         default:
 347             vlc_mutex_unlock( &p_sap->object_lock );
 348             vlc_freeaddrinfo( res );
 349             msg_Err( p_sap, "Address family %d not supported by SAP",
 350                      addr.ss_family );
 351             return VLC_EGENERIC;
 352     }
 353
 354     i = vlc_getnameinfo( (struct sockaddr *)&addr, res->ai_addrlen,
 355                          psz_addr, sizeof( psz_addr ), NULL, NI_NUMERICHOST );
 356     vlc_freeaddrinfo( res );
 357
 358     if( i )
 359     {
 360         vlc_mutex_unlock( &p_sap->object_lock );
 361         msg_Err( p_sap, "%s", vlc_gai_strerror( i ) );
 362         return VLC_EGENERIC;
 363     }
 364
 365     msg_Dbg( p_sap, "using SAP address: %s", psz_addr);
 366
 367     /* XXX: Check for dupes */
 368     p_sap_session = (sap_session_t*)malloc(sizeof(sap_session_t));
 369     p_sap_session->p_address = NULL;
 370
 371     /* Add the address to the buffer */
 372     for( i = 0; i < p_sap->i_addresses; i++)
 373     {
 374         if( !strcmp( psz_addr, p_sap->pp_addresses[i]->psz_address ) )
 375         {
 376             p_sap_session->p_address = p_sap->pp_addresses[i];
 377             break;
 378         }
 379     }
 380
 381     if( p_sap_session->p_address == NULL )
 382     {
 383         sap_address_t *p_address = (sap_address_t *)
 384                                     malloc( sizeof(sap_address_t) );
 385         if( !p_address )
 386         {
 387             msg_Err( p_sap, "out of memory" );
 388             return VLC_ENOMEM;
 389         }
 390         p_address->psz_address = strdup( psz_addr );
 391         p_address->i_port  =  9875;
 392         p_address->i_wfd = net_OpenUDP( p_sap, "", 0, psz_addr,
 393                                         p_address->i_port );
 394         if( p_address->i_wfd != -1 )
 395         {
 396             char *ptr;
 397
 398             net_StopRecv( p_address->i_wfd );
 399             net_GetSockAddress( p_sap, p_address->i_wfd,
 400                                 p_address->psz_machine, NULL );
 401
 402             /* removes scope if present */
 403             ptr = strchr( p_address->psz_machine, '%' );
 404             if( ptr != NULL )
 405                 *ptr = '\0';
 406         }
 407
 408         if( p_sap->b_control == VLC_TRUE )
 409         {
 410             p_address->i_rfd = net_OpenUDP( p_sap, psz_addr,
 411                                             p_address->i_port, "", 0 );
 412             if( p_address->i_rfd != -1 )
 413                 net_StopSend( p_address->i_rfd );
 414             p_address->i_buff = 0;
 415             p_address->b_enabled = VLC_TRUE;
 416             p_address->b_ready = VLC_FALSE;
 417             p_address->i_limit = 10000; /* 10000 bps */
 418             p_address->t1 = 0;
 419         }
 420         else
 421         {
 422             p_address->b_enabled = VLC_TRUE;
 423             p_address->b_ready = VLC_TRUE;
 424             p_address->i_interval = config_GetInt( p_sap,"sap-interval");
 425             p_address->i_rfd = -1;
 426         }
 427
 428         if( p_address->i_wfd == -1 || (p_address->i_rfd == -1
 429                                         && p_sap->b_control ) )
 430         {
 431             msg_Warn( p_sap, "disabling address" );
 432             p_address->b_enabled = VLC_FALSE;
 433         }
 434
 435         INSERT_ELEM( p_sap->pp_addresses,
 436                      p_sap->i_addresses,
 437                      p_sap->i_addresses,
 438                      p_address );
 439         p_sap_session->p_address = p_address;
 440     }
 441
 442
 443     /* Build the SAP Headers */
 444     i_header_size = ( b_ipv6 ? 16 : 4 ) + 20;
 445     psz_head = (char *) malloc( i_header_size * sizeof( char ) );
 446     if( psz_head == NULL )
 447     {
 448         msg_Err( p_sap, "out of memory" );
 449         return VLC_ENOMEM;
 450     }
 451
 452     /* SAPv1, not encrypted, not compressed */
 453     psz_head[0] = b_ipv6 ? 0x30 : 0x20;
 454     psz_head[1] = 0x00; /* No authentification length */
 455
 456     i_hash = mdate();
 457     psz_head[2] = (i_hash & 0xFF00) >> 8; /* Msg id hash */
 458     psz_head[3] = (i_hash & 0xFF);        /* Msg id hash 2 */
 459
 460     inet_pton( b_ipv6 ? AF_INET6 : AF_INET, /* can't fail */
 461                p_sap_session->p_address->psz_machine, psz_head + 4 );
 462
 463     memcpy( psz_head + (b_ipv6 ? 20 : 8), "application/sdp", 15 );
 464
 465     /* If needed, build the SDP */
 466     if( p_session->psz_sdp == NULL )
 467     {
 468         p_session->psz_sdp = SDPGenerate( p_sap, p_session,
 469                                           p_sap_session->p_address );
 470         if( p_session->psz_sdp == NULL )
 471         {
 472             vlc_mutex_unlock( &p_sap->object_lock );
 473             return VLC_ENOMEM;
 474         }
 475     }
 476
 477     p_sap_session->psz_sdp = strdup( p_session->psz_sdp );
 478     p_sap_session->i_last = 0;
 479
 480     psz_head[ i_header_size-1 ] = '\0';
 481     p_sap_session->i_length = i_header_size + strlen( p_sap_session->psz_sdp);
 482
 483     p_sap_session->psz_data = (uint8_t *)malloc( sizeof(char)*
 484                                                  p_sap_session->i_length );
 485
 486     /* Build the final message */
 487     memcpy( p_sap_session->psz_data, psz_head, i_header_size );
 488     memcpy( p_sap_session->psz_data+i_header_size, p_sap_session->psz_sdp,
 489             strlen( p_sap_session->psz_sdp) );
 490
 491     free( psz_head );
 492
 493     /* Enqueue the announce */
 494     INSERT_ELEM( p_sap->pp_sessions,
 495                  p_sap->i_sessions,
 496                  p_sap->i_sessions,
 497                  p_sap_session );
 498     msg_Dbg( p_sap,"Addresses: %i  Sessions: %i",
 499                    p_sap->i_addresses,p_sap->i_sessions);
 500
 501     /* Remember the SAP session for later deletion */
 502     p_session->p_sap = p_sap_session;
 503
 504     vlc_mutex_unlock( &p_sap->object_lock );
 505
 506     return VLC_SUCCESS;
 507 }
 508
 509 /* Remove a SAP Announce */
 510 static int announce_SAPAnnounceDel( sap_handler_t *p_sap,
 511                              session_descriptor_t *p_session )
 512 {
 513     int i;
 514     vlc_mutex_lock( &p_sap->object_lock );
 515
 516     msg_Dbg( p_sap,"removing SAP announce %p",p_session->p_sap);
 517
 518     /* Dequeue the announce */
 519     for( i = 0; i< p_sap->i_sessions; i++)
 520     {
 521         if( p_session->p_sap == p_sap->pp_sessions[i] )
 522         {
 523             REMOVE_ELEM( p_sap->pp_sessions,
 524                          p_sap->i_sessions,
 525                          i );
 526
 527             FREE( p_session->p_sap->psz_sdp );
 528             FREE( p_session->p_sap->psz_data );
 529             free( p_session->p_sap );
 530             break;
 531         }
 532     }
 533
 534     /* XXX: Dequeue the address too if it is not used anymore
 535      * TODO: - address refcount
 536              - send a SAP deletion packet */
 537
 538     msg_Dbg( p_sap,"%i announces remaining", p_sap->i_sessions );
 539
 540     vlc_mutex_unlock( &p_sap->object_lock );
 541
 542     return VLC_SUCCESS;
 543 }
 544
 545 static int announce_SendSAPAnnounce( sap_handler_t *p_sap,
 546                                      sap_session_t *p_session )
 547 {
 548     int i_ret;
 549
 550     /* This announce has never been sent yet */
 551     if( p_session->i_last == 0 )
 552     {
 553         p_session->i_next = mdate()+ p_session->p_address->i_interval*1000000;
 554         p_session->i_last = 1;
 555         return VLC_SUCCESS;
 556     }
 557
 558     if( p_session->i_next < mdate() )
 559     {
 560 #ifdef EXTRA_DEBUG
 561         msg_Dbg( p_sap, "Sending announce");
 562 #endif
 563         i_ret = net_Write( p_sap, p_session->p_address->i_wfd, NULL,
 564                            p_session->psz_data,
 565                            p_session->i_length );
 566         if( i_ret != (int)p_session->i_length )
 567         {
 568             msg_Warn( p_sap, "SAP send failed on address %s (%i %i)",
 569                    p_session->p_address->psz_address,
 570                    i_ret, p_session->i_length );
 571         }
 572         p_session->i_last = p_session->i_next;
 573         p_session->i_next = p_session->i_last
 574                             + p_session->p_address->i_interval*1000000;
 575     }
 576     else
 577     {
 578         return VLC_SUCCESS;
 579     }
 580     return VLC_SUCCESS;
 581 }
 582
 583 static char *SDPGenerate( sap_handler_t *p_sap,
 584                           const session_descriptor_t *p_session,
 585                           const sap_address_t *p_addr )
 586 {
 587     int64_t i_sdp_id = mdate();
 588     int     i_sdp_version = 1 + p_sap->i_sessions + (rand()&0xfff);
 589     char *psz_group, *psz_name, psz_uribuf[NI_MAXNUMERICHOST], *psz_uri,
 590          *psz_sdp;
 591     char ipv;
 592
 593     psz_group = convert_to_utf8( p_sap, p_session->psz_group );
 594     psz_name = convert_to_utf8( p_sap, p_session->psz_name );
 595     if( psz_name == NULL )
 596     {
 597         FREE( psz_group );
 598         return NULL;
 599     }
 600
 601     /* FIXME: really check that psz_uri is a real IP address
 602      * FIXME: make a common function to obtain a canonical IP address */
 603     ipv = ( strchr( p_session->psz_uri, ':' )  != NULL) ? '6' : '4';
 604     if( *p_session->psz_uri == '[' )
 605     {
 606         char *ptr;
 607
 608         strncpy( psz_uribuf, p_session->psz_uri + 1, sizeof( psz_uribuf ) );
 609         psz_uribuf[sizeof( psz_uribuf ) - 1] = '\0';
 610         ptr = strchr( psz_uribuf, '%' );
 611         if( ptr != NULL)
 612             *ptr = '\0';
 613         ptr = strchr( psz_uribuf, ']' );
 614         if( ptr != NULL)
 615             *ptr = '\0';
 616         psz_uri = psz_uribuf;
 617     }
 618     else
 619         psz_uri = p_session->psz_uri;
 620
 621     /* see the lists in modules/stream_out/rtp.c for compliance stuff */
 622     if( asprintf( &psz_sdp,
 623                             "v=0\r\n"
 624                             "o=- "I64Fd" %d IN IP%c %s\r\n"
 625                             "s=%s\r\n"
 626                             "t=0 0\r\n"
 627                             "c=IN IP%c %s/%d\r\n"
 628                             "m=video %d udp %d\r\n"
 629                             "a=tool:"PACKAGE_STRING"\r\n"
 630                             "a=type:broadcast\r\n",
 631                             i_sdp_id, i_sdp_version,
 632                             ipv, p_addr->psz_machine,
 633                             psz_name, ipv,
 634                             psz_uri, p_session->i_ttl,
 635                             p_session->i_port, p_session->i_payload ) == -1 )
 636     {
 637         free( psz_name );
 638         FREE( psz_group );
 639         return NULL;
 640     }
 641
 642     free( psz_name );
 643
 644     if( psz_group )
 645     {
 646         /* FIXME: this is illegal use of sprintf */
 647         sprintf( psz_sdp, "%sa=x-plgroup:%s\r\n", psz_sdp, psz_group );
 648         free( psz_group );
 649     }
 650
 651     msg_Dbg( p_sap, "Generated SDP (%i bytes):\n%s", strlen(psz_sdp),
 652              psz_sdp );
 653     return psz_sdp;
 654 }
 655
 656 static int CalculateRate( sap_handler_t *p_sap, sap_address_t *p_address )
 657 {
 658     int i_read;
 659     uint8_t buffer[SAP_MAX_BUFFER];
 660     int i_tot = 0;
 661     mtime_t i_temp;
 662     int i_rate;
 663
 664     if( p_address->t1 == 0 )
 665     {
 666         p_address->t1 = mdate();
 667         return VLC_SUCCESS;
 668     }
 669     do
 670     {
 671         /* Might be too slow if we have huge data */
 672         i_read = net_ReadNonBlock( p_sap, p_address->i_rfd, NULL, buffer,
 673                                    SAP_MAX_BUFFER, 0 );
 674         i_tot += i_read;
 675     } while( i_read > 0 && i_tot < SAP_MAX_BUFFER );
 676
 677     i_temp = mdate();
 678
 679     /* We calculate the rate every 5 seconds */
 680     if( i_temp - p_address->t1 < 5000000 )
 681     {
 682         p_address->i_buff += i_tot;
 683         return VLC_SUCCESS;
 684     }
 685
 686     /* Bits/second */
 687     i_rate = (int)(8*1000000*((mtime_t)p_address->i_buff + (mtime_t)i_tot ) /
 688                         (i_temp - p_address->t1 ));
 689
 690     p_address->i_limit = 10000;
 691
 692     p_address->i_interval = ((1000*i_rate / p_address->i_limit) *
 693                             (MAX_INTERVAL - MIN_INTERVAL))/1000 + MIN_INTERVAL;
 694
 695     if( p_address->i_interval > MAX_INTERVAL || p_address->i_interval < 0 )
 696     {
 697         p_address->i_interval = MAX_INTERVAL;
 698     }
 699 #ifdef EXTRA_DEBUG
 700     msg_Dbg( p_sap,"%s:%i : Rate=%i, Interval = %i s",
 701                     p_address->psz_address,p_address->i_port,
 702                     i_rate,
 703                     p_address->i_interval );
 704 #endif
 705
 706     p_address->b_ready = VLC_TRUE;
 707
 708     p_address->t1 = i_temp;
 709     p_address->i_buff = 0;
 710
 711     return VLC_SUCCESS;
 712 }
 713
 714
 715 static char *convert_to_utf8( struct sap_handler_t *p_this, char *psz_local )
 716 {
 717     char *psz_unicode, *psz_in, *psz_out;
 718     size_t ret, i_in, i_out;
 719
 720     if( psz_local == NULL )
 721         return NULL;
 722     if ( p_this->iconvHandle == (vlc_iconv_t)(-1) )
 723         return strdup( psz_local );
 724
 725     psz_in = psz_local;
 726     i_in = strlen( psz_local );
 727
 728     i_out = 6 * i_in;
 729     psz_unicode = malloc( i_out + 1 );
 730     if( psz_unicode == NULL )
 731         return strdup( psz_local );
 732     psz_out = psz_unicode;
 733
 734     ret = vlc_iconv( p_this->iconvHandle,
 735                      &psz_in, &i_in, &psz_out, &i_out);
 736     if( ret == (size_t)(-1) || i_in )
 737     {
 738         msg_Warn( p_this, "Failed to convert \"%s\" to UTF-8", psz_local );
 739         return strdup( psz_local );
 740     }
 741     *psz_out = '\0';
 742     return psz_unicode;
 743 }