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  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #include <stdlib.h>                                                /* free() */
  28 #include <stdio.h>                                              /* sprintf() */
  29 #include <string.h>                                            /* strerror() */
  30 #include <ctype.h>                                  /* tolower(), isxdigit() */
  31
  32 #include <vlc/vlc.h>
  33 #include <vlc/sout.h>
  34
  35 #include "network.h"
  36 #if defined( WIN32 ) || defined( UNDER_CE )
  37 #   if defined(UNDER_CE) && defined(sockaddr_storage)
  38 #       undef sockaddr_storage
  39 #   endif
  40 #   include <winsock2.h>
  41 #   include <ws2tcpip.h>
  42 #else
  43 #   include <netdb.h>
  44 #endif
  45 #include "charset.h"
  46
  47 /* SAP is always on that port */
  48 #define SAP_PORT 9875
  49
  50 #define DEFAULT_PORT "1234"
  51
  52 #undef EXTRA_DEBUG
  53
  54 /* SAP Specific structures */
  55
  56 /* 100ms */
  57 #define SAP_IDLE ((mtime_t)(0.100*CLOCK_FREQ))
  58 #define SAP_MAX_BUFFER 65534
  59 #define MIN_INTERVAL 2
  60 #define MAX_INTERVAL 300
  61
  62 /* A SAP announce address. For each of these, we run the
  63  * control flow algorithm */
  64 struct sap_address_t
  65 {
  66     char *psz_address;
  67     int i_port;
  68     int i_rfd; /* Read socket */
  69     int i_wfd; /* Write socket */
  70
  71     /* Used for flow control */
  72     mtime_t t1;
  73     vlc_bool_t b_enabled;
  74     vlc_bool_t b_ready;
  75     int i_interval;
  76     int i_buff;
  77     int i_limit;
  78 };
  79
  80 /*****************************************************************************
  81  * Local prototypes
  82  *****************************************************************************/
  83 static void RunThread( vlc_object_t *p_this);
  84 static int CalculateRate( sap_handler_t *p_sap, sap_address_t *p_address );
  85 static int SDPGenerate( sap_handler_t *p_sap, session_descriptor_t *p_session );
  86
  87 static int announce_SendSAPAnnounce( sap_handler_t *p_sap,
  88                                      sap_session_t *p_session );
  89
  90
  91 static int announce_SAPAnnounceAdd( sap_handler_t *p_sap,
  92                              session_descriptor_t *p_session,
  93                              announce_method_t *p_method );
  94
  95 static int announce_SAPAnnounceDel( sap_handler_t *p_sap,
  96                              session_descriptor_t *p_session );
  97 static char *convert_to_utf8( struct sap_handler_t *p_this, char *psz_local );
  98
  99 #define FREE( p ) if( p ) { free( p ); (p) = NULL; }
 100
 101
 102 /**
 103  * Create the SAP handler
 104  *
 105  * \param p_announce the parent announce_handler
 106  * \return the newly created SAP handler or NULL on error
 107  */
 108 sap_handler_t *announce_SAPHandlerCreate( announce_handler_t *p_announce )
 109 {
 110     sap_handler_t *p_sap;
 111     char *psz_charset;
 112
 113     p_sap = vlc_object_create( p_announce, sizeof( sap_handler_t ) );
 114
 115     if( !p_sap )
 116     {
 117         msg_Err( p_announce, "out of memory" );
 118         return NULL;
 119     }
 120
 121     vlc_mutex_init( p_sap, &p_sap->object_lock );
 122
 123     vlc_current_charset( &psz_charset );
 124     p_sap->iconvHandle = vlc_iconv_open( "UTF-8", psz_charset );
 125     free( psz_charset );
 126     if( p_sap->iconvHandle == (vlc_iconv_t)(-1) )
 127     {
 128         msg_Warn( p_sap, "Unable to do requested conversion" );
 129     }
 130
 131     p_sap->pf_add = announce_SAPAnnounceAdd;
 132     p_sap->pf_del = announce_SAPAnnounceDel;
 133
 134     p_sap->i_sessions = 0;
 135     p_sap->i_addresses = 0;
 136     p_sap->i_current_session = 0;
 137
 138     p_sap->b_control = config_GetInt( p_sap, "sap-flow-control");
 139
 140     if( vlc_thread_create( p_sap, "sap handler", RunThread,
 141                        VLC_THREAD_PRIORITY_LOW, VLC_FALSE ) )
 142     {
 143         msg_Dbg( p_announce, "Unable to spawn SAP handler thread");
 144         free( p_sap );
 145         return NULL;
 146     };
 147     msg_Dbg( p_announce, "thread created, %i sessions", p_sap->i_sessions);
 148     return p_sap;
 149 }
 150
 151 /**
 152  *  Destroy the SAP handler
 153  *  \param p_this the SAP Handler to destroy
 154  *  \return nothing
 155  */
 156 void announce_SAPHandlerDestroy( sap_handler_t *p_sap )
 157 {
 158     int i;
 159
 160     vlc_mutex_destroy( &p_sap->object_lock );
 161
 162     /* Free the remaining sessions */
 163     for( i = 0 ; i< p_sap->i_sessions ; i++)
 164     {
 165         sap_session_t *p_session = p_sap->pp_sessions[i];
 166         FREE( p_session->psz_sdp );
 167         FREE( p_session->psz_data );
 168         REMOVE_ELEM( p_sap->pp_sessions, p_sap->i_sessions , i );
 169         FREE( p_session );
 170     }
 171
 172     /* Free the remaining addresses */
 173     for( i = 0 ; i< p_sap->i_addresses ; i++)
 174     {
 175         sap_address_t *p_address = p_sap->pp_addresses[i];
 176         FREE( p_address->psz_address );
 177         if( p_address->i_rfd > -1 )
 178         {
 179             net_Close( p_address->i_rfd );
 180         }
 181         if( p_address->i_wfd > -1 && p_sap->b_control )
 182         {
 183             net_Close( p_address->i_wfd );
 184         }
 185         REMOVE_ELEM( p_sap->pp_addresses, p_sap->i_addresses, i );
 186         FREE( p_address );
 187     }
 188
 189     if( p_sap->iconvHandle != (vlc_iconv_t)(-1) )
 190         vlc_iconv_close( p_sap->iconvHandle );
 191
 192     /* Free the structure */
 193     vlc_object_destroy( p_sap );
 194 }
 195
 196 /**
 197  * main SAP handler thread
 198  * \param p_this the SAP Handler object
 199  * \return nothing
 200  */
 201 static void RunThread( vlc_object_t *p_this)
 202 {
 203     sap_handler_t *p_sap = (sap_handler_t*)p_this;
 204     sap_session_t *p_session;
 205
 206     while( !p_sap->b_die )
 207     {
 208         int i;
 209
 210         /* If needed, get the rate info */
 211         if( p_sap->b_control == VLC_TRUE )
 212         {
 213             for( i = 0 ; i< p_sap->i_addresses ; i++)
 214             {
 215                 if( p_sap->pp_addresses[i]->b_enabled == VLC_TRUE )
 216                 {
 217                     CalculateRate( p_sap, p_sap->pp_addresses[i] );
 218                 }
 219             }
 220         }
 221
 222         /* Find the session to announce */
 223         vlc_mutex_lock( &p_sap->object_lock );
 224         if( p_sap->i_sessions > p_sap->i_current_session + 1)
 225         {
 226             p_sap->i_current_session++;
 227         }
 228         else if( p_sap->i_sessions > 0)
 229         {
 230             p_sap->i_current_session = 0;
 231         }
 232         else
 233         {
 234             vlc_mutex_unlock( &p_sap->object_lock );
 235             msleep( SAP_IDLE );
 236             continue;
 237         }
 238         p_session = p_sap->pp_sessions[p_sap->i_current_session];
 239         vlc_mutex_unlock( &p_sap->object_lock );
 240
 241         /* And announce it */
 242         if( p_session->p_address->b_enabled == VLC_TRUE &&
 243             p_session->p_address->b_ready == VLC_TRUE )
 244         {
 245             announce_SendSAPAnnounce( p_sap, p_session );
 246         }
 247
 248         msleep( SAP_IDLE );
 249     }
 250 }
 251
 252 /* Add a SAP announce */
 253 static int announce_SAPAnnounceAdd( sap_handler_t *p_sap,
 254                              session_descriptor_t *p_session,
 255                              announce_method_t *p_method )
 256 {
 257     int i;
 258     char *psz_type = "application/sdp";
 259     int i_header_size;
 260     char *psz_head;
 261     vlc_bool_t b_found = VLC_FALSE, b_ipv6;
 262     sap_session_t *p_sap_session;
 263     mtime_t i_hash;
 264
 265     vlc_mutex_lock( &p_sap->object_lock );
 266
 267     /* If needed, build the SDP */
 268     if( !p_session->psz_sdp )
 269     {
 270         if ( SDPGenerate( p_sap, p_session ) != VLC_SUCCESS )
 271         {
 272             vlc_mutex_unlock( &p_sap->object_lock );
 273             return VLC_EGENERIC;
 274         }
 275     }
 276
 277     if( p_method->psz_address == NULL )
 278     {
 279         /* Determine SAP multicast address automatically */
 280         char psz_buf[NI_MAXHOST], *ptr;
 281         const char *psz_addr;
 282         struct addrinfo hints, *res;
 283
 284         if( p_session->psz_uri == NULL )
 285         {
 286             msg_Err( p_sap, "*FIXME* Unexpected NULL URI for SAP announce" );
 287             msg_Err( p_sap, "This should not happen. VLC needs fixing." );
 288             vlc_mutex_unlock( &p_sap->object_lock );
 289             return VLC_EGENERIC;
 290         }
 291
 292         /* Canonicalize IP address (e.g. 224.00.010.1 => 224.0.10.1) */
 293         memset( &hints, 0, sizeof( hints ) );
 294         hints.ai_socktype = SOCK_DGRAM;
 295         hints.ai_flags = AI_NUMERICHOST;
 296
 297         i = vlc_getaddrinfo( (vlc_object_t *)p_sap, p_session->psz_uri, NULL,
 298                              &hints, &res );
 299         if( i == 0 )
 300             i = vlc_getnameinfo( (vlc_object_t *)p_sap, res->ai_addr,
 301                                  res->ai_addrlen, psz_buf, sizeof( psz_buf ),
 302                                  NULL, 0, NI_NUMERICHOST );
 303         if( i )
 304         {
 305             msg_Err( p_sap, "Invalid URI for SAP announce : %s : %s",
 306                      p_session->psz_uri, vlc_gai_strerror( i ) );
 307             vlc_mutex_unlock( &p_sap->object_lock );
 308             return VLC_EGENERIC;
 309         }
 310
 311         /* Remove interface specification if present */
 312         ptr = strchr( psz_buf, '%' );
 313         if( ptr != NULL )
 314             *ptr = '\0';
 315
 316         if( strchr( psz_buf, ':' ) != NULL )
 317         {
 318             b_ipv6 = VLC_TRUE;
 319
 320             /* See RFC3513 for list of valid IPv6 scopes */
 321             if( ( tolower( psz_buf[0] ) == 'f' )
 322              && ( tolower( psz_buf[1] ) == 'f' )
 323              && isxdigit( psz_buf[2] ) && isxdigit( psz_buf[3] ) )
 324             {
 325                 /* Multicast IPv6 */
 326                 psz_buf[2] = '0'; /* force flags to zero */
 327                 /* keep scope in psz_addr[3] */
 328                 memcpy( &psz_buf[4], "::2:7ffe", sizeof( "::2:7ffe" ) );
 329                 psz_addr = psz_buf;
 330             }
 331             else
 332                 /* Unicast IPv6 - assume global scope */
 333                 psz_addr = "ff0e::2:7ffe";
 334         }
 335         else
 336         {
 337             b_ipv6 = VLC_FALSE;
 338
 339             /* See RFC2365 for IPv4 scopes */
 340             if( memcmp( psz_buf, "224.0.0.", 8 ) == 0 )
 341                 psz_addr = "224.0.0.255";
 342             else
 343             if( memcmp( psz_buf, "239.255.", 8 ) == 0 )
 344                 psz_addr = "239.255.255.255";
 345             else
 346             if( ( memcmp( psz_buf, "239.19", 6 ) == 0 )
 347              && ( ( psz_buf[6] >= '2' ) && ( psz_buf[6] <= '5' ) ) )
 348                 psz_addr = "239.195.255.255";
 349             else
 350                 /* assume global scope */
 351                 psz_addr = "224.2.127.254";
 352         }
 353
 354         p_method->psz_address = strdup( psz_addr );
 355     }
 356     else
 357         b_ipv6 == (strchr( p_method->psz_address, ':' ) != NULL);
 358
 359     msg_Dbg( p_sap, "using SAP address: %s", p_method->psz_address);
 360
 361     /* XXX: Check for dupes */
 362     p_sap_session = (sap_session_t*)malloc(sizeof(sap_session_t));
 363
 364     p_sap_session->psz_sdp = strdup( p_session->psz_sdp );
 365     p_sap_session->i_last = 0;
 366
 367     /* Add the address to the buffer */
 368     for( i = 0; i< p_sap->i_addresses; i++)
 369     {
 370         if( !strcmp( p_method->psz_address,
 371              p_sap->pp_addresses[i]->psz_address ) )
 372         {
 373             p_sap_session->p_address = p_sap->pp_addresses[i];
 374             b_found = VLC_TRUE;
 375             break;
 376         }
 377     }
 378     if( b_found == VLC_FALSE )
 379     {
 380         sap_address_t *p_address = (sap_address_t *)
 381                                     malloc( sizeof(sap_address_t) );
 382         if( !p_address )
 383         {
 384             msg_Err( p_sap, "out of memory" );
 385             return VLC_ENOMEM;
 386         }
 387         p_address->psz_address = strdup( p_method->psz_address );
 388         p_address->i_port  =  9875;
 389         p_address->i_wfd = net_OpenUDP( p_sap, "", 0,
 390                                         p_address->psz_address,
 391                                         p_address->i_port );
 392
 393         if( p_sap->b_control == VLC_TRUE )
 394         {
 395             p_address->i_rfd = net_OpenUDP( p_sap, p_method->psz_address,
 396                                             p_address->i_port,
 397                                             "", 0 );
 398             p_address->i_buff = 0;
 399             p_address->b_enabled = VLC_TRUE;
 400             p_address->b_ready = VLC_FALSE;
 401             p_address->i_limit = 10000; /* 10000 bps */
 402             p_address->t1 = 0;
 403         }
 404         else
 405         {
 406             p_address->b_enabled = VLC_TRUE;
 407             p_address->b_ready = VLC_TRUE;
 408             p_address->i_interval = config_GetInt( p_sap,"sap-interval");
 409             p_address->i_rfd = -1;
 410         }
 411
 412         if( p_address->i_wfd == -1 || (p_address->i_rfd == -1
 413                                         && p_sap->b_control ) )
 414         {
 415             msg_Warn( p_sap, "disabling address" );
 416             p_address->b_enabled = VLC_FALSE;
 417         }
 418
 419         INSERT_ELEM( p_sap->pp_addresses,
 420                      p_sap->i_addresses,
 421                      p_sap->i_addresses,
 422                      p_address );
 423         p_sap_session->p_address = p_address;
 424     }
 425
 426     /* Build the SAP Headers */
 427     i_header_size = ( b_ipv6 ? 20 : 8 ) + strlen( psz_type ) + 1;
 428     psz_head = (char *) malloc( i_header_size * sizeof( char ) );
 429     if( ! psz_head )
 430     {
 431         msg_Err( p_sap, "out of memory" );
 432         return VLC_ENOMEM;
 433     }
 434
 435     psz_head[0] = 0x20; /* Means SAPv1, IPv4, not encrypted, not compressed */
 436     psz_head[1] = 0x00; /* No authentification length */
 437
 438     i_hash = mdate();
 439     psz_head[2] = (i_hash & 0xFF00) >> 8; /* Msg id hash */
 440     psz_head[3] = (i_hash & 0xFF);        /* Msg id hash 2 */
 441
 442     if( b_ipv6 )
 443     {
 444         /* in_addr_t ip_server = inet_addr( ip ); */
 445         psz_head[0] |= 0x10; /* Set IPv6 */
 446
 447         psz_head[4] = 0x01; /* Source IP  FIXME: we should get the real address */
 448         psz_head[5] = 0x02; /* idem */
 449         psz_head[6] = 0x03; /* idem */
 450         psz_head[7] = 0x04; /* idem */
 451
 452         psz_head[8] = 0x01; /* Source IP  FIXME: we should get the real address */
 453         psz_head[9] = 0x02; /* idem */
 454         psz_head[10] = 0x03; /* idem */
 455         psz_head[11] = 0x04; /* idem */
 456
 457         psz_head[12] = 0x01; /* Source IP  FIXME: we should get the real address */
 458         psz_head[13] = 0x02; /* idem */
 459         psz_head[14] = 0x03; /* idem */
 460         psz_head[15] = 0x04; /* idem */
 461
 462         psz_head[16] = 0x01; /* Source IP  FIXME: we should get the real address */
 463         psz_head[17] = 0x02; /* idem */
 464         psz_head[18] = 0x03; /* idem */
 465         psz_head[19] = 0x04; /* idem */
 466
 467         strncpy( psz_head + 20, psz_type, 15 );
 468     }
 469     else
 470     {
 471         /* in_addr_t ip_server = inet_addr( ip) */
 472         /* Source IP  FIXME: we should get the real address */
 473         psz_head[4] = 0x01; /* ip_server */
 474         psz_head[5] = 0x02; /* ip_server>>8 */
 475         psz_head[6] = 0x03; /* ip_server>>16 */
 476         psz_head[7] = 0x04; /* ip_server>>24 */
 477
 478         strncpy( psz_head + 8, psz_type, 15 );
 479     }
 480
 481     psz_head[ i_header_size-1 ] = '\0';
 482     p_sap_session->i_length = i_header_size + strlen( p_sap_session->psz_sdp);
 483
 484     p_sap_session->psz_data = (char *)malloc( sizeof(char)*
 485                                               p_sap_session->i_length );
 486
 487     /* Build the final message */
 488     memcpy( p_sap_session->psz_data, psz_head, i_header_size );
 489     memcpy( p_sap_session->psz_data+i_header_size, p_sap_session->psz_sdp,
 490             strlen( p_sap_session->psz_sdp) );
 491
 492     free( psz_head );
 493
 494     /* Enqueue the announce */
 495     INSERT_ELEM( p_sap->pp_sessions,
 496                  p_sap->i_sessions,
 497                  p_sap->i_sessions,
 498                  p_sap_session );
 499     msg_Dbg( p_sap,"Addresses: %i  Sessions: %i",
 500                    p_sap->i_addresses,p_sap->i_sessions);
 501
 502     /* Remember the SAP session for later deletion */
 503     p_session->p_sap = p_sap_session;
 504
 505     vlc_mutex_unlock( &p_sap->object_lock );
 506
 507     return VLC_SUCCESS;
 508 }
 509
 510 /* Remove a SAP Announce */
 511 static int announce_SAPAnnounceDel( sap_handler_t *p_sap,
 512                              session_descriptor_t *p_session )
 513 {
 514     int i;
 515     vlc_mutex_lock( &p_sap->object_lock );
 516
 517     msg_Dbg( p_sap,"removing SAP announce %p",p_session->p_sap);
 518
 519     /* Dequeue the announce */
 520     for( i = 0; i< p_sap->i_sessions; i++)
 521     {
 522         if( p_session->p_sap == p_sap->pp_sessions[i] )
 523         {
 524             REMOVE_ELEM( p_sap->pp_sessions,
 525                          p_sap->i_sessions,
 526                          i );
 527
 528             FREE( p_session->p_sap->psz_sdp );
 529             FREE( p_session->p_sap->psz_data );
 530             free( p_session->p_sap );
 531             break;
 532         }
 533     }
 534
 535     /* XXX: Dequeue the address too if it is not used anymore
 536      * TODO: - address refcount
 537              - send a SAP deletion packet */
 538
 539     msg_Dbg( p_sap,"%i announces remaining", p_sap->i_sessions );
 540
 541     vlc_mutex_unlock( &p_sap->object_lock );
 542
 543     return VLC_SUCCESS;
 544 }
 545
 546 static int announce_SendSAPAnnounce( sap_handler_t *p_sap,
 547                                      sap_session_t *p_session )
 548 {
 549     int i_ret;
 550
 551     /* This announce has never been sent yet */
 552     if( p_session->i_last == 0 )
 553     {
 554         p_session->i_next = mdate()+ p_session->p_address->i_interval*1000000;
 555         p_session->i_last = 1;
 556         return VLC_SUCCESS;
 557     }
 558
 559     if( p_session->i_next < mdate() )
 560     {
 561 #ifdef EXTRA_DEBUG
 562         msg_Dbg( p_sap, "Sending announce");
 563 #endif
 564         i_ret = net_Write( p_sap, p_session->p_address->i_wfd, NULL,
 565                            p_session->psz_data,
 566                            p_session->i_length );
 567         if( i_ret  != p_session->i_length )
 568         {
 569             msg_Warn( p_sap, "SAP send failed on address %s (%i %i)",
 570                    p_session->p_address->psz_address,
 571                    i_ret, p_session->i_length );
 572         }
 573         p_session->i_last = p_session->i_next;
 574         p_session->i_next = p_session->i_last
 575                             + p_session->p_address->i_interval*1000000;
 576     }
 577     else
 578     {
 579         return VLC_SUCCESS;
 580     }
 581     return VLC_SUCCESS;
 582 }
 583
 584 static int SDPGenerate( sap_handler_t *p_sap, session_descriptor_t *p_session )
 585 {
 586     int64_t i_sdp_id = mdate();
 587     int     i_sdp_version = 1 + p_sap->i_sessions + (rand()&0xfff);
 588     char *psz_group, *psz_name, psz_uri[NI_MAXHOST];
 589     char ipv;
 590
 591     psz_group = convert_to_utf8( p_sap, p_session->psz_group );
 592     psz_name = convert_to_utf8( p_sap, p_session->psz_name );
 593
 594     /* FIXME: really check that psz_uri is a real IP address
 595      * FIXME: make a common function to obtain a canonical IP address */
 596     ipv = ( strchr( p_session->psz_uri, ':' )  != NULL) ? '6' : '4';
 597     if( *p_session->psz_uri == '[' )
 598     {
 599         char *ptr;
 600
 601         strncpy( psz_uri, p_session->psz_uri + 1, sizeof( psz_uri ) );
 602         psz_uri[sizeof( psz_uri ) - 1] = '\0';
 603         ptr = strchr( psz_uri, '%' );
 604         if( ptr != NULL)
 605             *ptr = '\0';
 606         ptr = strchr( psz_uri, ']' );
 607         if( ptr != NULL)
 608             *ptr = '\0';
 609     }
 610
 611     /* see the lists in modules/stream_out/rtp.c for compliance stuff */
 612     p_session->psz_sdp = (char *)malloc(
 613                             sizeof("v=0\r\n"
 614                                    "o=- 45383436098 45398  IN IP4 127.0.0.1\r\n" /* FIXME */
 615                                    "s=\r\n"
 616                                    "t=0 0\r\n"
 617                                    "c=IN IP4 /\r\n"
 618                                    "m=video  udp\r\n"
 619                                    "a=tool:"PACKAGE_STRING"\r\n"
 620                                    "a=type:broadcast\r\n")
 621                            + strlen( psz_name )
 622                            + strlen( psz_uri ) + 300
 623                            + ( psz_group ? strlen( psz_group ) : 0 ) );
 624
 625     if( p_session->psz_sdp == NULL || psz_name == NULL )
 626     {
 627         msg_Err( p_sap, "out of memory" );
 628         FREE( psz_name );
 629         FREE( psz_group );
 630         return VLC_ENOMEM;
 631     }
 632
 633     sprintf( p_session->psz_sdp,
 634                             "v=0\r\n"
 635                             "o=- "I64Fd" %d IN IP4 127.0.0.1\r\n"
 636                             "s=%s\r\n"
 637                             "t=0 0\r\n"
 638                             "c=IN IP%c %s/%d\r\n"
 639                             "m=video %d udp %d\r\n"
 640                             "a=tool:"PACKAGE_STRING"\r\n"
 641                             "a=type:broadcast\r\n",
 642                             i_sdp_id, i_sdp_version,
 643                             psz_name, ipv,
 644                             psz_uri, p_session->i_ttl,
 645                             p_session->i_port, p_session->i_payload );
 646     free( psz_name );
 647
 648     if( psz_group )
 649     {
 650         sprintf( p_session->psz_sdp, "%sa=x-plgroup:%s\r\n",
 651                                      p_session->psz_sdp, psz_group );
 652         free( psz_group );
 653     }
 654
 655     msg_Dbg( p_sap, "Generated SDP (%i bytes):\n%s", strlen(p_session->psz_sdp),
 656                     p_session->psz_sdp );
 657     return VLC_SUCCESS;
 658 }
 659
 660 static int CalculateRate( sap_handler_t *p_sap, sap_address_t *p_address )
 661 {
 662     int i_read;
 663     char 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 }