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

   1 /*****************************************************************************
   2  * sap.c : SAP announce handler
   3  *****************************************************************************
   4  * Copyright (C) 2002-2005 VideoLAN
   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     int i_port;
  69     int i_rfd; /* Read socket */
  70     int i_wfd; /* Write socket */
  71
  72     /* Used for flow control */
  73     mtime_t t1;
  74     vlc_bool_t b_enabled;
  75     vlc_bool_t b_ready;
  76     int i_interval;
  77     int i_buff;
  78     int i_limit;
  79 };
  80
  81 /*****************************************************************************
  82  * Local prototypes
  83  *****************************************************************************/
  84 static void RunThread( vlc_object_t *p_this);
  85 static int CalculateRate( sap_handler_t *p_sap, sap_address_t *p_address );
  86 static int SDPGenerate( sap_handler_t *p_sap, session_descriptor_t *p_session );
  87
  88 static int announce_SendSAPAnnounce( sap_handler_t *p_sap,
  89                                      sap_session_t *p_session );
  90
  91
  92 static int announce_SAPAnnounceAdd( sap_handler_t *p_sap,
  93                              session_descriptor_t *p_session,
  94                              announce_method_t *p_method );
  95
  96 static int announce_SAPAnnounceDel( sap_handler_t *p_sap,
  97                              session_descriptor_t *p_session );
  98 static char *convert_to_utf8( struct sap_handler_t *p_this, char *psz_local );
  99
 100 #define FREE( p ) if( p ) { free( p ); (p) = NULL; }
 101
 102
 103 /**
 104  * Create the SAP handler
 105  *
 106  * \param p_announce the parent announce_handler
 107  * \return the newly created SAP handler or NULL on error
 108  */
 109 sap_handler_t *announce_SAPHandlerCreate( announce_handler_t *p_announce )
 110 {
 111     sap_handler_t *p_sap;
 112     char *psz_charset;
 113
 114     p_sap = vlc_object_create( p_announce, sizeof( sap_handler_t ) );
 115
 116     if( !p_sap )
 117     {
 118         msg_Err( p_announce, "out of memory" );
 119         return NULL;
 120     }
 121
 122     vlc_mutex_init( p_sap, &p_sap->object_lock );
 123
 124     vlc_current_charset( &psz_charset );
 125     p_sap->iconvHandle = vlc_iconv_open( "UTF-8", psz_charset );
 126     free( psz_charset );
 127     if( p_sap->iconvHandle == (vlc_iconv_t)(-1) )
 128     {
 129         msg_Warn( p_sap, "Unable to do requested conversion" );
 130     }
 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                              announce_method_t *p_method )
 257 {
 258     int i;
 259     char *psz_type = "application/sdp";
 260     int i_header_size;
 261     char *psz_head;
 262     vlc_bool_t b_found = VLC_FALSE, b_ipv6 = VLC_FALSE;
 263     sap_session_t *p_sap_session;
 264     mtime_t i_hash;
 265
 266     vlc_mutex_lock( &p_sap->object_lock );
 267
 268     /* If needed, build the SDP */
 269     if( !p_session->psz_sdp )
 270     {
 271         if ( SDPGenerate( p_sap, p_session ) != VLC_SUCCESS )
 272         {
 273             vlc_mutex_unlock( &p_sap->object_lock );
 274             return VLC_EGENERIC;
 275         }
 276     }
 277
 278     if( p_method->psz_address == NULL )
 279     {
 280         /* Determine SAP multicast address automatically */
 281         char psz_buf[NI_MAXNUMERICHOST], *ptr;
 282         const char *psz_addr;
 283         struct addrinfo hints, *res;
 284
 285         if( p_session->psz_uri == NULL )
 286         {
 287             msg_Err( p_sap, "*FIXME* Unexpected NULL URI for SAP announce" );
 288             msg_Err( p_sap, "This should not happen. VLC needs fixing." );
 289             vlc_mutex_unlock( &p_sap->object_lock );
 290             return VLC_EGENERIC;
 291         }
 292
 293         /* Canonicalize IP address (e.g. 224.00.010.1 => 224.0.10.1) */
 294         memset( &hints, 0, sizeof( hints ) );
 295         hints.ai_socktype = SOCK_DGRAM;
 296         hints.ai_flags = AI_NUMERICHOST;
 297
 298         i = vlc_getaddrinfo( (vlc_object_t *)p_sap, p_session->psz_uri, 0,
 299                              &hints, &res );
 300         if( i == 0 )
 301             i = vlc_getnameinfo( (vlc_object_t *)p_sap, res->ai_addr,
 302                                  res->ai_addrlen, psz_buf, sizeof( psz_buf ),
 303                                  NULL, NI_NUMERICHOST );
 304         if( i )
 305         {
 306             msg_Err( p_sap, "Invalid URI for SAP announce : %s : %s",
 307                      p_session->psz_uri, vlc_gai_strerror( i ) );
 308             vlc_mutex_unlock( &p_sap->object_lock );
 309             return VLC_EGENERIC;
 310         }
 311
 312         /* Remove interface specification if present */
 313         ptr = strchr( psz_buf, '%' );
 314         if( ptr != NULL )
 315             *ptr = '\0';
 316
 317         if( strchr( psz_buf, ':' ) != NULL )
 318         {
 319             b_ipv6 = VLC_TRUE;
 320
 321             /* See RFC3513 for list of valid IPv6 scopes */
 322             if( ( tolower( psz_buf[0] ) == 'f' )
 323              && ( tolower( psz_buf[1] ) == 'f' )
 324              && isxdigit( psz_buf[2] ) && isxdigit( psz_buf[3] ) )
 325             {
 326                 /* Multicast IPv6 */
 327                 psz_buf[2] = '0'; /* force flags to zero */
 328                 /* keep scope in psz_addr[3] */
 329                 memcpy( &psz_buf[4], "::2:7ffe", sizeof( "::2:7ffe" ) );
 330                 psz_addr = psz_buf;
 331             }
 332             else
 333                 /* Unicast IPv6 - assume global scope */
 334                 psz_addr = "ff0e::2:7ffe";
 335         }
 336         else
 337         {
 338             /* See RFC2365 for IPv4 scopes */
 339             if( memcmp( psz_buf, "224.0.0.", 8 ) == 0 )
 340                 psz_addr = "224.0.0.255";
 341             else
 342             if( memcmp( psz_buf, "239.255.", 8 ) == 0 )
 343                 psz_addr = "239.255.255.255";
 344             else
 345             if( ( memcmp( psz_buf, "239.19", 6 ) == 0 )
 346              && ( ( psz_buf[6] >= '2' ) && ( psz_buf[6] <= '5' ) ) )
 347                 psz_addr = "239.195.255.255";
 348             else
 349                 /* assume global scope */
 350                 psz_addr = "224.2.127.254";
 351         }
 352
 353         p_method->psz_address = strdup( psz_addr );
 354     }
 355     else
 356         b_ipv6 == (strchr( p_method->psz_address, ':' ) != NULL);
 357
 358     msg_Dbg( p_sap, "using SAP address: %s", p_method->psz_address);
 359
 360     /* XXX: Check for dupes */
 361     p_sap_session = (sap_session_t*)malloc(sizeof(sap_session_t));
 362
 363     p_sap_session->psz_sdp = strdup( p_session->psz_sdp );
 364     p_sap_session->i_last = 0;
 365
 366     /* Add the address to the buffer */
 367     for( i = 0; i< p_sap->i_addresses; i++)
 368     {
 369         if( !strcmp( p_method->psz_address,
 370              p_sap->pp_addresses[i]->psz_address ) )
 371         {
 372             p_sap_session->p_address = p_sap->pp_addresses[i];
 373             b_found = VLC_TRUE;
 374             break;
 375         }
 376     }
 377     if( b_found == VLC_FALSE )
 378     {
 379         sap_address_t *p_address = (sap_address_t *)
 380                                     malloc( sizeof(sap_address_t) );
 381         if( !p_address )
 382         {
 383             msg_Err( p_sap, "out of memory" );
 384             return VLC_ENOMEM;
 385         }
 386         p_address->psz_address = strdup( p_method->psz_address );
 387         p_address->i_port  =  9875;
 388         p_address->i_wfd = net_OpenUDP( p_sap, "", 0,
 389                                         p_address->psz_address,
 390                                         p_address->i_port );
 391
 392         if( p_sap->b_control == VLC_TRUE )
 393         {
 394             p_address->i_rfd = net_OpenUDP( p_sap, p_method->psz_address,
 395                                             p_address->i_port,
 396                                             "", 0 );
 397             p_address->i_buff = 0;
 398             p_address->b_enabled = VLC_TRUE;
 399             p_address->b_ready = VLC_FALSE;
 400             p_address->i_limit = 10000; /* 10000 bps */
 401             p_address->t1 = 0;
 402         }
 403         else
 404         {
 405             p_address->b_enabled = VLC_TRUE;
 406             p_address->b_ready = VLC_TRUE;
 407             p_address->i_interval = config_GetInt( p_sap,"sap-interval");
 408             p_address->i_rfd = -1;
 409         }
 410
 411         if( p_address->i_wfd == -1 || (p_address->i_rfd == -1
 412                                         && p_sap->b_control ) )
 413         {
 414             msg_Warn( p_sap, "disabling address" );
 415             p_address->b_enabled = VLC_FALSE;
 416         }
 417
 418         INSERT_ELEM( p_sap->pp_addresses,
 419                      p_sap->i_addresses,
 420                      p_sap->i_addresses,
 421                      p_address );
 422         p_sap_session->p_address = p_address;
 423     }
 424
 425     /* Build the SAP Headers */
 426     i_header_size = ( b_ipv6 ? 20 : 8 ) + strlen( psz_type ) + 1;
 427     psz_head = (char *) malloc( i_header_size * sizeof( char ) );
 428     if( ! psz_head )
 429     {
 430         msg_Err( p_sap, "out of memory" );
 431         return VLC_ENOMEM;
 432     }
 433
 434     psz_head[0] = 0x20; /* Means SAPv1, IPv4, not encrypted, not compressed */
 435     psz_head[1] = 0x00; /* No authentification length */
 436
 437     i_hash = mdate();
 438     psz_head[2] = (i_hash & 0xFF00) >> 8; /* Msg id hash */
 439     psz_head[3] = (i_hash & 0xFF);        /* Msg id hash 2 */
 440
 441     if( b_ipv6 )
 442     {
 443         /* in_addr_t ip_server = inet_addr( ip ); */
 444         psz_head[0] |= 0x10; /* Set IPv6 */
 445
 446         psz_head[4] = 0x01; /* Source IP  FIXME: we should get the real address */
 447         psz_head[5] = 0x02; /* idem */
 448         psz_head[6] = 0x03; /* idem */
 449         psz_head[7] = 0x04; /* idem */
 450
 451         psz_head[8] = 0x01; /* Source IP  FIXME: we should get the real address */
 452         psz_head[9] = 0x02; /* idem */
 453         psz_head[10] = 0x03; /* idem */
 454         psz_head[11] = 0x04; /* idem */
 455
 456         psz_head[12] = 0x01; /* Source IP  FIXME: we should get the real address */
 457         psz_head[13] = 0x02; /* idem */
 458         psz_head[14] = 0x03; /* idem */
 459         psz_head[15] = 0x04; /* idem */
 460
 461         psz_head[16] = 0x01; /* Source IP  FIXME: we should get the real address */
 462         psz_head[17] = 0x02; /* idem */
 463         psz_head[18] = 0x03; /* idem */
 464         psz_head[19] = 0x04; /* idem */
 465
 466         strncpy( psz_head + 20, psz_type, 15 );
 467     }
 468     else
 469     {
 470         /* in_addr_t ip_server = inet_addr( ip) */
 471         /* Source IP  FIXME: we should get the real address */
 472         psz_head[4] = 0x01; /* ip_server */
 473         psz_head[5] = 0x02; /* ip_server>>8 */
 474         psz_head[6] = 0x03; /* ip_server>>16 */
 475         psz_head[7] = 0x04; /* ip_server>>24 */
 476
 477         strncpy( psz_head + 8, psz_type, 15 );
 478     }
 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 = (char *)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  != 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 int SDPGenerate( sap_handler_t *p_sap, session_descriptor_t *p_session )
 584 {
 585     int64_t i_sdp_id = mdate();
 586     int     i_sdp_version = 1 + p_sap->i_sessions + (rand()&0xfff);
 587     char *psz_group, *psz_name, psz_uribuf[NI_MAXNUMERICHOST], *psz_uri;
 588     char ipv;
 589
 590     psz_group = convert_to_utf8( p_sap, p_session->psz_group );
 591     psz_name = convert_to_utf8( p_sap, p_session->psz_name );
 592
 593     /* FIXME: really check that psz_uri is a real IP address
 594      * FIXME: make a common function to obtain a canonical IP address */
 595     ipv = ( strchr( p_session->psz_uri, ':' )  != NULL) ? '6' : '4';
 596     if( *p_session->psz_uri == '[' )
 597     {
 598         char *ptr;
 599
 600         strncpy( psz_uribuf, p_session->psz_uri + 1, sizeof( psz_uribuf ) );
 601         psz_uribuf[sizeof( psz_uribuf ) - 1] = '\0';
 602         ptr = strchr( psz_uribuf, '%' );
 603         if( ptr != NULL)
 604             *ptr = '\0';
 605         ptr = strchr( psz_uribuf, ']' );
 606         if( ptr != NULL)
 607             *ptr = '\0';
 608         psz_uri = psz_uribuf;
 609     }
 610     else
 611         psz_uri = p_session->psz_uri;
 612
 613     /* see the lists in modules/stream_out/rtp.c for compliance stuff */
 614     p_session->psz_sdp = (char *)malloc(
 615                             sizeof("v=0\r\n"
 616                                    "o=- 45383436098 45398  IN IP4 127.0.0.1\r\n" /* FIXME */
 617                                    "s=\r\n"
 618                                    "t=0 0\r\n"
 619                                    "c=IN IP4 /\r\n"
 620                                    "m=video  udp\r\n"
 621                                    "a=tool:"PACKAGE_STRING"\r\n"
 622                                    "a=type:broadcast\r\n")
 623                            + strlen( psz_name )
 624                            + strlen( psz_uri ) + 300
 625                            + ( psz_group ? strlen( psz_group ) : 0 ) );
 626
 627     if( p_session->psz_sdp == NULL || psz_name == NULL )
 628     {
 629         msg_Err( p_sap, "out of memory" );
 630         FREE( psz_name );
 631         FREE( psz_group );
 632         return VLC_ENOMEM;
 633     }
 634
 635     sprintf( p_session->psz_sdp,
 636                             "v=0\r\n"
 637                             "o=- "I64Fd" %d IN IP4 127.0.0.1\r\n"
 638                             "s=%s\r\n"
 639                             "t=0 0\r\n"
 640                             "c=IN IP%c %s/%d\r\n"
 641                             "m=video %d udp %d\r\n"
 642                             "a=tool:"PACKAGE_STRING"\r\n"
 643                             "a=type:broadcast\r\n",
 644                             i_sdp_id, i_sdp_version,
 645                             psz_name, ipv,
 646                             psz_uri, p_session->i_ttl,
 647                             p_session->i_port, p_session->i_payload );
 648     free( psz_name );
 649
 650     if( psz_group )
 651     {
 652         sprintf( p_session->psz_sdp, "%sa=x-plgroup:%s\r\n",
 653                                      p_session->psz_sdp, psz_group );
 654         free( psz_group );
 655     }
 656
 657     msg_Dbg( p_sap, "Generated SDP (%i bytes):\n%s", strlen(p_session->psz_sdp),
 658                     p_session->psz_sdp );
 659     return VLC_SUCCESS;
 660 }
 661
 662 static int CalculateRate( sap_handler_t *p_sap, sap_address_t *p_address )
 663 {
 664     int i_read;
 665     char buffer[SAP_MAX_BUFFER];
 666     int i_tot = 0;
 667     mtime_t i_temp;
 668     int i_rate;
 669
 670     if( p_address->t1 == 0 )
 671     {
 672         p_address->t1 = mdate();
 673         return VLC_SUCCESS;
 674     }
 675     do
 676     {
 677         /* Might be too slow if we have huge data */
 678         i_read = net_ReadNonBlock( p_sap, p_address->i_rfd, NULL, buffer,
 679                                    SAP_MAX_BUFFER, 0 );
 680         i_tot += i_read;
 681     } while( i_read > 0 && i_tot < SAP_MAX_BUFFER );
 682
 683     i_temp = mdate();
 684
 685     /* We calculate the rate every 5 seconds */
 686     if( i_temp - p_address->t1 < 5000000 )
 687     {
 688         p_address->i_buff += i_tot;
 689         return VLC_SUCCESS;
 690     }
 691
 692     /* Bits/second */
 693     i_rate = (int)(8*1000000*((mtime_t)p_address->i_buff + (mtime_t)i_tot ) /
 694                         (i_temp - p_address->t1 ));
 695
 696     p_address->i_limit = 10000;
 697
 698     p_address->i_interval = ((1000*i_rate / p_address->i_limit) *
 699                             (MAX_INTERVAL - MIN_INTERVAL))/1000 + MIN_INTERVAL;
 700
 701     if( p_address->i_interval > MAX_INTERVAL || p_address->i_interval < 0 )
 702     {
 703         p_address->i_interval = MAX_INTERVAL;
 704     }
 705 #ifdef EXTRA_DEBUG
 706     msg_Dbg( p_sap,"%s:%i : Rate=%i, Interval = %i s",
 707                     p_address->psz_address,p_address->i_port,
 708                     i_rate,
 709                     p_address->i_interval );
 710 #endif
 711
 712     p_address->b_ready = VLC_TRUE;
 713
 714     p_address->t1 = i_temp;
 715     p_address->i_buff = 0;
 716
 717     return VLC_SUCCESS;
 718 }
 719
 720
 721 static char *convert_to_utf8( struct sap_handler_t *p_this, char *psz_local )
 722 {
 723     char *psz_unicode, *psz_in, *psz_out;
 724     size_t ret, i_in, i_out;
 725
 726     if( psz_local == NULL )
 727         return NULL;
 728     if ( p_this->iconvHandle == (vlc_iconv_t)(-1) )
 729         return strdup( psz_local );
 730
 731     psz_in = psz_local;
 732     i_in = strlen( psz_local );
 733
 734     i_out = 6 * i_in;
 735     psz_unicode = malloc( i_out + 1 );
 736     if( psz_unicode == NULL )
 737         return strdup( psz_local );
 738     psz_out = psz_unicode;
 739
 740     ret = vlc_iconv( p_this->iconvHandle,
 741                      &psz_in, &i_in, &psz_out, &i_out);
 742     if( ret == (size_t)(-1) || i_in )
 743     {
 744         msg_Warn( p_this, "Failed to convert \"%s\" to UTF-8", psz_local );
 745         return strdup( psz_local );
 746     }
 747     *psz_out = '\0';
 748     return psz_unicode;
 749 }