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;
 258     const char *psz_type = "application/sdp";
 259     int i_header_size;
 260     char *psz_head;
 261     vlc_bool_t b_ipv6 = VLC_FALSE;
 262     sap_session_t *p_sap_session;
 263     mtime_t i_hash;
 264     char psz_buf[NI_MAXNUMERICHOST], *ptr;
 265     const char *psz_addr;
 266     struct addrinfo hints, *res;
 267
 268
 269     vlc_mutex_lock( &p_sap->object_lock );
 270
 271     if( p_session->psz_uri == NULL )
 272     {
 273         msg_Err( p_sap, "*FIXME* Unexpected NULL URI for SAP announce" );
 274         msg_Err( p_sap, "This should not happen. VLC needs fixing." );
 275         vlc_mutex_unlock( &p_sap->object_lock );
 276         return VLC_EGENERIC;
 277     }
 278
 279     /* Determine SAP multicast address automatically (FIXME: gruik) */
 280     /* Canonicalize IP address (e.g. 224.00.010.1 => 224.0.10.1) */
 281     memset( &hints, 0, sizeof( hints ) );
 282     hints.ai_socktype = SOCK_DGRAM;
 283     hints.ai_flags = AI_NUMERICHOST;
 284
 285     i = vlc_getaddrinfo( (vlc_object_t *)p_sap, p_session->psz_uri, 0,
 286                          &hints, &res );
 287     if( i == 0 )
 288     {
 289         i = vlc_getnameinfo( res->ai_addr, res->ai_addrlen, psz_buf,
 290                              sizeof( psz_buf ), NULL, NI_NUMERICHOST );
 291         vlc_freeaddrinfo( res );
 292     }
 293
 294     if( i )
 295     {
 296         msg_Err( p_sap, "Invalid URI for SAP announce : %s : %s",
 297                  p_session->psz_uri, vlc_gai_strerror( i ) );
 298         vlc_mutex_unlock( &p_sap->object_lock );
 299         return VLC_EGENERIC;
 300     }
 301
 302     /* Remove interface specification if present */
 303     ptr = strchr( psz_buf, '%' );
 304     if( ptr != NULL )
 305         *ptr = '\0';
 306
 307     if( strchr( psz_buf, ':' ) != NULL )
 308     {
 309         b_ipv6 = VLC_TRUE;
 310
 311         /* See RFC3513 for list of valid IPv6 scopes */
 312         if( ( tolower( psz_buf[0] ) == 'f' )
 313          && ( tolower( psz_buf[1] ) == 'f' )
 314          && isxdigit( psz_buf[2] ) && isxdigit( psz_buf[3] ) )
 315         {
 316             /* Multicast IPv6 */
 317             psz_buf[2] = '0'; /* force flags to zero */
 318             /* keep scope in psz_addr[3] */
 319             memcpy( &psz_buf[4], "::2:7ffe", sizeof( "::2:7ffe" ) );
 320             psz_addr = psz_buf;
 321         }
 322         else
 323             /* Unicast IPv6 - assume global scope */
 324             psz_addr = "ff0e::2:7ffe";
 325     }
 326     else
 327     {
 328         /* See RFC2365 for IPv4 scopes */
 329         if( memcmp( psz_buf, "224.0.0.", 8 ) == 0 )
 330             psz_addr = "224.0.0.255";
 331         else
 332         if( memcmp( psz_buf, "239.255.", 8 ) == 0 )
 333             psz_addr = "239.255.255.255";
 334         else
 335         if( ( memcmp( psz_buf, "239.19", 6 ) == 0 )
 336          && ( ( psz_buf[6] >= '2' ) && ( psz_buf[6] <= '5' ) ) )
 337             psz_addr = "239.195.255.255";
 338         else
 339             /* assume global scope */
 340             psz_addr = "224.2.127.254";
 341     }
 342
 343     msg_Dbg( p_sap, "using SAP address: %s", psz_addr);
 344
 345     /* XXX: Check for dupes */
 346     p_sap_session = (sap_session_t*)malloc(sizeof(sap_session_t));
 347     p_sap_session->p_address = NULL;
 348
 349     /* Add the address to the buffer */
 350     for( i = 0; i < p_sap->i_addresses; i++)
 351     {
 352         if( !strcmp( psz_addr, p_sap->pp_addresses[i]->psz_address ) )
 353         {
 354             p_sap_session->p_address = p_sap->pp_addresses[i];
 355             break;
 356         }
 357     }
 358
 359     if( p_sap_session->p_address == NULL )
 360     {
 361         sap_address_t *p_address = (sap_address_t *)
 362                                     malloc( sizeof(sap_address_t) );
 363         if( !p_address )
 364         {
 365             msg_Err( p_sap, "out of memory" );
 366             return VLC_ENOMEM;
 367         }
 368         p_address->psz_address = strdup( psz_addr );
 369         p_address->i_port  =  9875;
 370         p_address->i_wfd = net_OpenUDP( p_sap, "", 0, psz_addr,
 371                                         p_address->i_port );
 372         if( p_address->i_wfd != -1 )
 373         {
 374             net_StopRecv( p_address->i_wfd );
 375             net_GetSockAddress( p_sap, p_address->i_wfd,
 376                                 p_address->psz_machine, NULL );
 377         }
 378
 379         if( p_sap->b_control == VLC_TRUE )
 380         {
 381             p_address->i_rfd = net_OpenUDP( p_sap, psz_addr,
 382                                             p_address->i_port, "", 0 );
 383             if( p_address->i_rfd != -1 )
 384                 net_StopSend( p_address->i_rfd );
 385             p_address->i_buff = 0;
 386             p_address->b_enabled = VLC_TRUE;
 387             p_address->b_ready = VLC_FALSE;
 388             p_address->i_limit = 10000; /* 10000 bps */
 389             p_address->t1 = 0;
 390         }
 391         else
 392         {
 393             p_address->b_enabled = VLC_TRUE;
 394             p_address->b_ready = VLC_TRUE;
 395             p_address->i_interval = config_GetInt( p_sap,"sap-interval");
 396             p_address->i_rfd = -1;
 397         }
 398
 399         if( p_address->i_wfd == -1 || (p_address->i_rfd == -1
 400                                         && p_sap->b_control ) )
 401         {
 402             msg_Warn( p_sap, "disabling address" );
 403             p_address->b_enabled = VLC_FALSE;
 404         }
 405
 406         INSERT_ELEM( p_sap->pp_addresses,
 407                      p_sap->i_addresses,
 408                      p_sap->i_addresses,
 409                      p_address );
 410         p_sap_session->p_address = p_address;
 411     }
 412
 413
 414     /* Build the SAP Headers */
 415     i_header_size = ( b_ipv6 ? 20 : 8 ) + strlen( psz_type ) + 1;
 416     psz_head = (char *) malloc( i_header_size * sizeof( char ) );
 417     if( psz_head == NULL )
 418     {
 419         msg_Err( p_sap, "out of memory" );
 420         return VLC_ENOMEM;
 421     }
 422
 423     psz_head[0] = 0x20; /* Means SAPv1, IPv4, not encrypted, not compressed */
 424     psz_head[1] = 0x00; /* No authentification length */
 425
 426     i_hash = mdate();
 427     psz_head[2] = (i_hash & 0xFF00) >> 8; /* Msg id hash */
 428     psz_head[3] = (i_hash & 0xFF);        /* Msg id hash 2 */
 429
 430     if( b_ipv6 )
 431     {
 432         /* in_addr_t ip_server = inet_addr( ip ); */
 433         psz_head[0] |= 0x10; /* Set IPv6 */
 434
 435         psz_head[4] = 0x01; /* Source IP  FIXME: we should get the real address */
 436         psz_head[5] = 0x02; /* idem */
 437         psz_head[6] = 0x03; /* idem */
 438         psz_head[7] = 0x04; /* idem */
 439
 440         psz_head[8] = 0x01; /* Source IP  FIXME: we should get the real address */
 441         psz_head[9] = 0x02; /* idem */
 442         psz_head[10] = 0x03; /* idem */
 443         psz_head[11] = 0x04; /* idem */
 444
 445         psz_head[12] = 0x01; /* Source IP  FIXME: we should get the real address */
 446         psz_head[13] = 0x02; /* idem */
 447         psz_head[14] = 0x03; /* idem */
 448         psz_head[15] = 0x04; /* idem */
 449
 450         psz_head[16] = 0x01; /* Source IP  FIXME: we should get the real address */
 451         psz_head[17] = 0x02; /* idem */
 452         psz_head[18] = 0x03; /* idem */
 453         psz_head[19] = 0x04; /* idem */
 454
 455         strncpy( psz_head + 20, psz_type, 15 );
 456     }
 457     else
 458     {
 459         /* in_addr_t ip_server = inet_addr( ip) */
 460         /* Source IP  FIXME: we should get the real address */
 461         psz_head[4] = 0x01; /* ip_server */
 462         psz_head[5] = 0x02; /* ip_server>>8 */
 463         psz_head[6] = 0x03; /* ip_server>>16 */
 464         psz_head[7] = 0x04; /* ip_server>>24 */
 465
 466         strncpy( psz_head + 8, psz_type, 15 );
 467     }
 468
 469     /* If needed, build the SDP */
 470     if( p_session->psz_sdp == NULL )
 471     {
 472         p_session->psz_sdp = SDPGenerate( p_sap, p_session,
 473                                           p_sap_session->p_address );
 474         if( p_session->psz_sdp == NULL )
 475         {
 476             vlc_mutex_unlock( &p_sap->object_lock );
 477             return VLC_ENOMEM;
 478         }
 479     }
 480
 481     p_sap_session->psz_sdp = strdup( p_session->psz_sdp );
 482     p_sap_session->i_last = 0;
 483
 484     psz_head[ i_header_size-1 ] = '\0';
 485     p_sap_session->i_length = i_header_size + strlen( p_sap_session->psz_sdp);
 486
 487     p_sap_session->psz_data = (uint8_t *)malloc( sizeof(char)*
 488                                                  p_sap_session->i_length );
 489
 490     /* Build the final message */
 491     memcpy( p_sap_session->psz_data, psz_head, i_header_size );
 492     memcpy( p_sap_session->psz_data+i_header_size, p_sap_session->psz_sdp,
 493             strlen( p_sap_session->psz_sdp) );
 494
 495     free( psz_head );
 496
 497     /* Enqueue the announce */
 498     INSERT_ELEM( p_sap->pp_sessions,
 499                  p_sap->i_sessions,
 500                  p_sap->i_sessions,
 501                  p_sap_session );
 502     msg_Dbg( p_sap,"Addresses: %i  Sessions: %i",
 503                    p_sap->i_addresses,p_sap->i_sessions);
 504
 505     /* Remember the SAP session for later deletion */
 506     p_session->p_sap = p_sap_session;
 507
 508     vlc_mutex_unlock( &p_sap->object_lock );
 509
 510     return VLC_SUCCESS;
 511 }
 512
 513 /* Remove a SAP Announce */
 514 static int announce_SAPAnnounceDel( sap_handler_t *p_sap,
 515                              session_descriptor_t *p_session )
 516 {
 517     int i;
 518     vlc_mutex_lock( &p_sap->object_lock );
 519
 520     msg_Dbg( p_sap,"removing SAP announce %p",p_session->p_sap);
 521
 522     /* Dequeue the announce */
 523     for( i = 0; i< p_sap->i_sessions; i++)
 524     {
 525         if( p_session->p_sap == p_sap->pp_sessions[i] )
 526         {
 527             REMOVE_ELEM( p_sap->pp_sessions,
 528                          p_sap->i_sessions,
 529                          i );
 530
 531             FREE( p_session->p_sap->psz_sdp );
 532             FREE( p_session->p_sap->psz_data );
 533             free( p_session->p_sap );
 534             break;
 535         }
 536     }
 537
 538     /* XXX: Dequeue the address too if it is not used anymore
 539      * TODO: - address refcount
 540              - send a SAP deletion packet */
 541
 542     msg_Dbg( p_sap,"%i announces remaining", p_sap->i_sessions );
 543
 544     vlc_mutex_unlock( &p_sap->object_lock );
 545
 546     return VLC_SUCCESS;
 547 }
 548
 549 static int announce_SendSAPAnnounce( sap_handler_t *p_sap,
 550                                      sap_session_t *p_session )
 551 {
 552     int i_ret;
 553
 554     /* This announce has never been sent yet */
 555     if( p_session->i_last == 0 )
 556     {
 557         p_session->i_next = mdate()+ p_session->p_address->i_interval*1000000;
 558         p_session->i_last = 1;
 559         return VLC_SUCCESS;
 560     }
 561
 562     if( p_session->i_next < mdate() )
 563     {
 564 #ifdef EXTRA_DEBUG
 565         msg_Dbg( p_sap, "Sending announce");
 566 #endif
 567         i_ret = net_Write( p_sap, p_session->p_address->i_wfd, NULL,
 568                            p_session->psz_data,
 569                            p_session->i_length );
 570         if( i_ret != (int)p_session->i_length )
 571         {
 572             msg_Warn( p_sap, "SAP send failed on address %s (%i %i)",
 573                    p_session->p_address->psz_address,
 574                    i_ret, p_session->i_length );
 575         }
 576         p_session->i_last = p_session->i_next;
 577         p_session->i_next = p_session->i_last
 578                             + p_session->p_address->i_interval*1000000;
 579     }
 580     else
 581     {
 582         return VLC_SUCCESS;
 583     }
 584     return VLC_SUCCESS;
 585 }
 586
 587 static char *SDPGenerate( sap_handler_t *p_sap,
 588                           const session_descriptor_t *p_session,
 589                           const sap_address_t *p_addr )
 590 {
 591     int64_t i_sdp_id = mdate();
 592     int     i_sdp_version = 1 + p_sap->i_sessions + (rand()&0xfff);
 593     char *psz_group, *psz_name, psz_uribuf[NI_MAXNUMERICHOST], *psz_uri,
 594          *psz_sdp;
 595     char ipv;
 596
 597     psz_group = convert_to_utf8( p_sap, p_session->psz_group );
 598     psz_name = convert_to_utf8( p_sap, p_session->psz_name );
 599     if( psz_name == NULL )
 600     {
 601         FREE( psz_group );
 602         return NULL;
 603     }
 604
 605     /* FIXME: really check that psz_uri is a real IP address
 606      * FIXME: make a common function to obtain a canonical IP address */
 607     ipv = ( strchr( p_session->psz_uri, ':' )  != NULL) ? '6' : '4';
 608     if( *p_session->psz_uri == '[' )
 609     {
 610         char *ptr;
 611
 612         strncpy( psz_uribuf, p_session->psz_uri + 1, sizeof( psz_uribuf ) );
 613         psz_uribuf[sizeof( psz_uribuf ) - 1] = '\0';
 614         ptr = strchr( psz_uribuf, '%' );
 615         if( ptr != NULL)
 616             *ptr = '\0';
 617         ptr = strchr( psz_uribuf, ']' );
 618         if( ptr != NULL)
 619             *ptr = '\0';
 620         psz_uri = psz_uribuf;
 621     }
 622     else
 623         psz_uri = p_session->psz_uri;
 624
 625     /* see the lists in modules/stream_out/rtp.c for compliance stuff */
 626     if( asprintf( &psz_sdp,
 627                             "v=0\r\n"
 628                             "o=- "I64Fd" %d IN IP%c %s\r\n"
 629                             "s=%s\r\n"
 630                             "t=0 0\r\n"
 631                             "c=IN IP%c %s/%d\r\n"
 632                             "m=video %d udp %d\r\n"
 633                             "a=tool:"PACKAGE_STRING"\r\n"
 634                             "a=type:broadcast\r\n",
 635                             i_sdp_id, i_sdp_version,
 636                             ipv, p_addr->psz_machine,
 637                             psz_name, ipv,
 638                             psz_uri, p_session->i_ttl,
 639                             p_session->i_port, p_session->i_payload ) == -1 )
 640     {
 641         free( psz_name );
 642         FREE( psz_group );
 643         return NULL;
 644     }
 645
 646     free( psz_name );
 647
 648     if( psz_group )
 649     {
 650         /* FIXME: this is illegal use of sprintf */
 651         sprintf( psz_sdp, "%sa=x-plgroup:%s\r\n", psz_sdp, psz_group );
 652         free( psz_group );
 653     }
 654
 655     msg_Dbg( p_sap, "Generated SDP (%i bytes):\n%s", strlen(psz_sdp),
 656              psz_sdp );
 657     return psz_sdp;
 658 }
 659
 660 static int CalculateRate( sap_handler_t *p_sap, sap_address_t *p_address )
 661 {
 662     int i_read;
 663     uint8_t buffer[SAP_MAX_BUFFER];
 664     int i_tot = 0;
 665     mtime_t i_temp;
 666     int i_rate;
 667
 668     if( p_address->t1 == 0 )
 669     {
 670         p_address->t1 = mdate();
 671         return VLC_SUCCESS;
 672     }
 673     do
 674     {
 675         /* Might be too slow if we have huge data */
 676         i_read = net_ReadNonBlock( p_sap, p_address->i_rfd, NULL, buffer,
 677                                    SAP_MAX_BUFFER, 0 );
 678         i_tot += i_read;
 679     } while( i_read > 0 && i_tot < SAP_MAX_BUFFER );
 680
 681     i_temp = mdate();
 682
 683     /* We calculate the rate every 5 seconds */
 684     if( i_temp - p_address->t1 < 5000000 )
 685     {
 686         p_address->i_buff += i_tot;
 687         return VLC_SUCCESS;
 688     }
 689
 690     /* Bits/second */
 691     i_rate = (int)(8*1000000*((mtime_t)p_address->i_buff + (mtime_t)i_tot ) /
 692                         (i_temp - p_address->t1 ));
 693
 694     p_address->i_limit = 10000;
 695
 696     p_address->i_interval = ((1000*i_rate / p_address->i_limit) *
 697                             (MAX_INTERVAL - MIN_INTERVAL))/1000 + MIN_INTERVAL;
 698
 699     if( p_address->i_interval > MAX_INTERVAL || p_address->i_interval < 0 )
 700     {
 701         p_address->i_interval = MAX_INTERVAL;
 702     }
 703 #ifdef EXTRA_DEBUG
 704     msg_Dbg( p_sap,"%s:%i : Rate=%i, Interval = %i s",
 705                     p_address->psz_address,p_address->i_port,
 706                     i_rate,
 707                     p_address->i_interval );
 708 #endif
 709
 710     p_address->b_ready = VLC_TRUE;
 711
 712     p_address->t1 = i_temp;
 713     p_address->i_buff = 0;
 714
 715     return VLC_SUCCESS;
 716 }
 717
 718
 719 static char *convert_to_utf8( struct sap_handler_t *p_this, char *psz_local )
 720 {
 721     char *psz_unicode, *psz_in, *psz_out;
 722     size_t ret, i_in, i_out;
 723
 724     if( psz_local == NULL )
 725         return NULL;
 726     if ( p_this->iconvHandle == (vlc_iconv_t)(-1) )
 727         return strdup( psz_local );
 728
 729     psz_in = psz_local;
 730     i_in = strlen( psz_local );
 731
 732     i_out = 6 * i_in;
 733     psz_unicode = malloc( i_out + 1 );
 734     if( psz_unicode == NULL )
 735         return strdup( psz_local );
 736     psz_out = psz_unicode;
 737
 738     ret = vlc_iconv( p_this->iconvHandle,
 739                      &psz_in, &i_in, &psz_out, &i_out);
 740     if( ret == (size_t)(-1) || i_in )
 741     {
 742         msg_Warn( p_this, "Failed to convert \"%s\" to UTF-8", psz_local );
 743         return strdup( psz_local );
 744     }
 745     *psz_out = '\0';
 746     return psz_unicode;
 747 }