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     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( res->ai_addr, res->ai_addrlen, psz_buf,
 302                                  sizeof( psz_buf ), NULL, 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             /* See RFC2365 for IPv4 scopes */
 338             if( memcmp( psz_buf, "224.0.0.", 8 ) == 0 )
 339                 psz_addr = "224.0.0.255";
 340             else
 341             if( memcmp( psz_buf, "239.255.", 8 ) == 0 )
 342                 psz_addr = "239.255.255.255";
 343             else
 344             if( ( memcmp( psz_buf, "239.19", 6 ) == 0 )
 345              && ( ( psz_buf[6] >= '2' ) && ( psz_buf[6] <= '5' ) ) )
 346                 psz_addr = "239.195.255.255";
 347             else
 348                 /* assume global scope */
 349                 psz_addr = "224.2.127.254";
 350         }
 351
 352         p_method->psz_address = strdup( psz_addr );
 353     }
 354     else
 355         b_ipv6 == (strchr( p_method->psz_address, ':' ) != NULL);
 356
 357     msg_Dbg( p_sap, "using SAP address: %s", p_method->psz_address);
 358
 359     /* XXX: Check for dupes */
 360     p_sap_session = (sap_session_t*)malloc(sizeof(sap_session_t));
 361
 362     p_sap_session->psz_sdp = strdup( p_session->psz_sdp );
 363     p_sap_session->i_last = 0;
 364
 365     /* Add the address to the buffer */
 366     for( i = 0; i< p_sap->i_addresses; i++)
 367     {
 368         if( !strcmp( p_method->psz_address,
 369              p_sap->pp_addresses[i]->psz_address ) )
 370         {
 371             p_sap_session->p_address = p_sap->pp_addresses[i];
 372             b_found = VLC_TRUE;
 373             break;
 374         }
 375     }
 376     if( b_found == VLC_FALSE )
 377     {
 378         sap_address_t *p_address = (sap_address_t *)
 379                                     malloc( sizeof(sap_address_t) );
 380         if( !p_address )
 381         {
 382             msg_Err( p_sap, "out of memory" );
 383             return VLC_ENOMEM;
 384         }
 385         p_address->psz_address = strdup( p_method->psz_address );
 386         p_address->i_port  =  9875;
 387         p_address->i_wfd = net_OpenUDP( p_sap, "", 0,
 388                                         p_address->psz_address,
 389                                         p_address->i_port );
 390         if( p_address->i_wfd != -1 )
 391             net_StopRecv( p_address->i_wfd );
 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             if( p_address->i_rfd != -1 )
 399                 net_StopSend( p_address->i_rfd );
 400             p_address->i_buff = 0;
 401             p_address->b_enabled = VLC_TRUE;
 402             p_address->b_ready = VLC_FALSE;
 403             p_address->i_limit = 10000; /* 10000 bps */
 404             p_address->t1 = 0;
 405         }
 406         else
 407         {
 408             p_address->b_enabled = VLC_TRUE;
 409             p_address->b_ready = VLC_TRUE;
 410             p_address->i_interval = config_GetInt( p_sap,"sap-interval");
 411             p_address->i_rfd = -1;
 412         }
 413
 414         if( p_address->i_wfd == -1 || (p_address->i_rfd == -1
 415                                         && p_sap->b_control ) )
 416         {
 417             msg_Warn( p_sap, "disabling address" );
 418             p_address->b_enabled = VLC_FALSE;
 419         }
 420
 421         INSERT_ELEM( p_sap->pp_addresses,
 422                      p_sap->i_addresses,
 423                      p_sap->i_addresses,
 424                      p_address );
 425         p_sap_session->p_address = p_address;
 426     }
 427
 428     /* Build the SAP Headers */
 429     i_header_size = ( b_ipv6 ? 20 : 8 ) + strlen( psz_type ) + 1;
 430     psz_head = (char *) malloc( i_header_size * sizeof( char ) );
 431     if( ! psz_head )
 432     {
 433         msg_Err( p_sap, "out of memory" );
 434         return VLC_ENOMEM;
 435     }
 436
 437     psz_head[0] = 0x20; /* Means SAPv1, IPv4, not encrypted, not compressed */
 438     psz_head[1] = 0x00; /* No authentification length */
 439
 440     i_hash = mdate();
 441     psz_head[2] = (i_hash & 0xFF00) >> 8; /* Msg id hash */
 442     psz_head[3] = (i_hash & 0xFF);        /* Msg id hash 2 */
 443
 444     if( b_ipv6 )
 445     {
 446         /* in_addr_t ip_server = inet_addr( ip ); */
 447         psz_head[0] |= 0x10; /* Set IPv6 */
 448
 449         psz_head[4] = 0x01; /* Source IP  FIXME: we should get the real address */
 450         psz_head[5] = 0x02; /* idem */
 451         psz_head[6] = 0x03; /* idem */
 452         psz_head[7] = 0x04; /* idem */
 453
 454         psz_head[8] = 0x01; /* Source IP  FIXME: we should get the real address */
 455         psz_head[9] = 0x02; /* idem */
 456         psz_head[10] = 0x03; /* idem */
 457         psz_head[11] = 0x04; /* idem */
 458
 459         psz_head[12] = 0x01; /* Source IP  FIXME: we should get the real address */
 460         psz_head[13] = 0x02; /* idem */
 461         psz_head[14] = 0x03; /* idem */
 462         psz_head[15] = 0x04; /* idem */
 463
 464         psz_head[16] = 0x01; /* Source IP  FIXME: we should get the real address */
 465         psz_head[17] = 0x02; /* idem */
 466         psz_head[18] = 0x03; /* idem */
 467         psz_head[19] = 0x04; /* idem */
 468
 469         strncpy( psz_head + 20, psz_type, 15 );
 470     }
 471     else
 472     {
 473         /* in_addr_t ip_server = inet_addr( ip) */
 474         /* Source IP  FIXME: we should get the real address */
 475         psz_head[4] = 0x01; /* ip_server */
 476         psz_head[5] = 0x02; /* ip_server>>8 */
 477         psz_head[6] = 0x03; /* ip_server>>16 */
 478         psz_head[7] = 0x04; /* ip_server>>24 */
 479
 480         strncpy( psz_head + 8, psz_type, 15 );
 481     }
 482
 483     psz_head[ i_header_size-1 ] = '\0';
 484     p_sap_session->i_length = i_header_size + strlen( p_sap_session->psz_sdp);
 485
 486     p_sap_session->psz_data = (char *)malloc( sizeof(char)*
 487                                               p_sap_session->i_length );
 488
 489     /* Build the final message */
 490     memcpy( p_sap_session->psz_data, psz_head, i_header_size );
 491     memcpy( p_sap_session->psz_data+i_header_size, p_sap_session->psz_sdp,
 492             strlen( p_sap_session->psz_sdp) );
 493
 494     free( psz_head );
 495
 496     /* Enqueue the announce */
 497     INSERT_ELEM( p_sap->pp_sessions,
 498                  p_sap->i_sessions,
 499                  p_sap->i_sessions,
 500                  p_sap_session );
 501     msg_Dbg( p_sap,"Addresses: %i  Sessions: %i",
 502                    p_sap->i_addresses,p_sap->i_sessions);
 503
 504     /* Remember the SAP session for later deletion */
 505     p_session->p_sap = p_sap_session;
 506
 507     vlc_mutex_unlock( &p_sap->object_lock );
 508
 509     return VLC_SUCCESS;
 510 }
 511
 512 /* Remove a SAP Announce */
 513 static int announce_SAPAnnounceDel( sap_handler_t *p_sap,
 514                              session_descriptor_t *p_session )
 515 {
 516     int i;
 517     vlc_mutex_lock( &p_sap->object_lock );
 518
 519     msg_Dbg( p_sap,"removing SAP announce %p",p_session->p_sap);
 520
 521     /* Dequeue the announce */
 522     for( i = 0; i< p_sap->i_sessions; i++)
 523     {
 524         if( p_session->p_sap == p_sap->pp_sessions[i] )
 525         {
 526             REMOVE_ELEM( p_sap->pp_sessions,
 527                          p_sap->i_sessions,
 528                          i );
 529
 530             FREE( p_session->p_sap->psz_sdp );
 531             FREE( p_session->p_sap->psz_data );
 532             free( p_session->p_sap );
 533             break;
 534         }
 535     }
 536
 537     /* XXX: Dequeue the address too if it is not used anymore
 538      * TODO: - address refcount
 539              - send a SAP deletion packet */
 540
 541     msg_Dbg( p_sap,"%i announces remaining", p_sap->i_sessions );
 542
 543     vlc_mutex_unlock( &p_sap->object_lock );
 544
 545     return VLC_SUCCESS;
 546 }
 547
 548 static int announce_SendSAPAnnounce( sap_handler_t *p_sap,
 549                                      sap_session_t *p_session )
 550 {
 551     int i_ret;
 552
 553     /* This announce has never been sent yet */
 554     if( p_session->i_last == 0 )
 555     {
 556         p_session->i_next = mdate()+ p_session->p_address->i_interval*1000000;
 557         p_session->i_last = 1;
 558         return VLC_SUCCESS;
 559     }
 560
 561     if( p_session->i_next < mdate() )
 562     {
 563 #ifdef EXTRA_DEBUG
 564         msg_Dbg( p_sap, "Sending announce");
 565 #endif
 566         i_ret = net_Write( p_sap, p_session->p_address->i_wfd, NULL,
 567                            p_session->psz_data,
 568                            p_session->i_length );
 569         if( i_ret  != p_session->i_length )
 570         {
 571             msg_Warn( p_sap, "SAP send failed on address %s (%i %i)",
 572                    p_session->p_address->psz_address,
 573                    i_ret, p_session->i_length );
 574         }
 575         p_session->i_last = p_session->i_next;
 576         p_session->i_next = p_session->i_last
 577                             + p_session->p_address->i_interval*1000000;
 578     }
 579     else
 580     {
 581         return VLC_SUCCESS;
 582     }
 583     return VLC_SUCCESS;
 584 }
 585
 586 static int SDPGenerate( sap_handler_t *p_sap, session_descriptor_t *p_session )
 587 {
 588     int64_t i_sdp_id = mdate();
 589     int     i_sdp_version = 1 + p_sap->i_sessions + (rand()&0xfff);
 590     char *psz_group, *psz_name, psz_uribuf[NI_MAXNUMERICHOST], *psz_uri;
 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
 596     /* FIXME: really check that psz_uri is a real IP address
 597      * FIXME: make a common function to obtain a canonical IP address */
 598     ipv = ( strchr( p_session->psz_uri, ':' )  != NULL) ? '6' : '4';
 599     if( *p_session->psz_uri == '[' )
 600     {
 601         char *ptr;
 602
 603         strncpy( psz_uribuf, p_session->psz_uri + 1, sizeof( psz_uribuf ) );
 604         psz_uribuf[sizeof( psz_uribuf ) - 1] = '\0';
 605         ptr = strchr( psz_uribuf, '%' );
 606         if( ptr != NULL)
 607             *ptr = '\0';
 608         ptr = strchr( psz_uribuf, ']' );
 609         if( ptr != NULL)
 610             *ptr = '\0';
 611         psz_uri = psz_uribuf;
 612     }
 613     else
 614         psz_uri = p_session->psz_uri;
 615
 616     /* see the lists in modules/stream_out/rtp.c for compliance stuff */
 617     p_session->psz_sdp = (char *)malloc(
 618                             sizeof("v=0\r\n"
 619                                    "o=- 45383436098 45398  IN IP4 127.0.0.1\r\n" /* FIXME */
 620                                    "s=\r\n"
 621                                    "t=0 0\r\n"
 622                                    "c=IN IP4 /\r\n"
 623                                    "m=video  udp\r\n"
 624                                    "a=tool:"PACKAGE_STRING"\r\n"
 625                                    "a=type:broadcast\r\n")
 626                            + strlen( psz_name )
 627                            + strlen( psz_uri ) + 300
 628                            + ( psz_group ? strlen( psz_group ) : 0 ) );
 629
 630     if( p_session->psz_sdp == NULL || psz_name == NULL )
 631     {
 632         msg_Err( p_sap, "out of memory" );
 633         FREE( psz_name );
 634         FREE( psz_group );
 635         return VLC_ENOMEM;
 636     }
 637
 638     sprintf( p_session->psz_sdp,
 639                             "v=0\r\n"
 640                             "o=- "I64Fd" %d IN IP4 127.0.0.1\r\n"
 641                             "s=%s\r\n"
 642                             "t=0 0\r\n"
 643                             "c=IN IP%c %s/%d\r\n"
 644                             "m=video %d udp %d\r\n"
 645                             "a=tool:"PACKAGE_STRING"\r\n"
 646                             "a=type:broadcast\r\n",
 647                             i_sdp_id, i_sdp_version,
 648                             psz_name, ipv,
 649                             psz_uri, p_session->i_ttl,
 650                             p_session->i_port, p_session->i_payload );
 651     free( psz_name );
 652
 653     if( psz_group )
 654     {
 655         sprintf( p_session->psz_sdp, "%sa=x-plgroup:%s\r\n",
 656                                      p_session->psz_sdp, psz_group );
 657         free( psz_group );
 658     }
 659
 660     msg_Dbg( p_sap, "Generated SDP (%i bytes):\n%s", strlen(p_session->psz_sdp),
 661                     p_session->psz_sdp );
 662     return VLC_SUCCESS;
 663 }
 664
 665 static int CalculateRate( sap_handler_t *p_sap, sap_address_t *p_address )
 666 {
 667     int i_read;
 668     char buffer[SAP_MAX_BUFFER];
 669     int i_tot = 0;
 670     mtime_t i_temp;
 671     int i_rate;
 672
 673     if( p_address->t1 == 0 )
 674     {
 675         p_address->t1 = mdate();
 676         return VLC_SUCCESS;
 677     }
 678     do
 679     {
 680         /* Might be too slow if we have huge data */
 681         i_read = net_ReadNonBlock( p_sap, p_address->i_rfd, NULL, buffer,
 682                                    SAP_MAX_BUFFER, 0 );
 683         i_tot += i_read;
 684     } while( i_read > 0 && i_tot < SAP_MAX_BUFFER );
 685
 686     i_temp = mdate();
 687
 688     /* We calculate the rate every 5 seconds */
 689     if( i_temp - p_address->t1 < 5000000 )
 690     {
 691         p_address->i_buff += i_tot;
 692         return VLC_SUCCESS;
 693     }
 694
 695     /* Bits/second */
 696     i_rate = (int)(8*1000000*((mtime_t)p_address->i_buff + (mtime_t)i_tot ) /
 697                         (i_temp - p_address->t1 ));
 698
 699     p_address->i_limit = 10000;
 700
 701     p_address->i_interval = ((1000*i_rate / p_address->i_limit) *
 702                             (MAX_INTERVAL - MIN_INTERVAL))/1000 + MIN_INTERVAL;
 703
 704     if( p_address->i_interval > MAX_INTERVAL || p_address->i_interval < 0 )
 705     {
 706         p_address->i_interval = MAX_INTERVAL;
 707     }
 708 #ifdef EXTRA_DEBUG
 709     msg_Dbg( p_sap,"%s:%i : Rate=%i, Interval = %i s",
 710                     p_address->psz_address,p_address->i_port,
 711                     i_rate,
 712                     p_address->i_interval );
 713 #endif
 714
 715     p_address->b_ready = VLC_TRUE;
 716
 717     p_address->t1 = i_temp;
 718     p_address->i_buff = 0;
 719
 720     return VLC_SUCCESS;
 721 }
 722
 723
 724 static char *convert_to_utf8( struct sap_handler_t *p_this, char *psz_local )
 725 {
 726     char *psz_unicode, *psz_in, *psz_out;
 727     size_t ret, i_in, i_out;
 728
 729     if( psz_local == NULL )
 730         return NULL;
 731     if ( p_this->iconvHandle == (vlc_iconv_t)(-1) )
 732         return strdup( psz_local );
 733
 734     psz_in = psz_local;
 735     i_in = strlen( psz_local );
 736
 737     i_out = 6 * i_in;
 738     psz_unicode = malloc( i_out + 1 );
 739     if( psz_unicode == NULL )
 740         return strdup( psz_local );
 741     psz_out = psz_unicode;
 742
 743     ret = vlc_iconv( p_this->iconvHandle,
 744                      &psz_in, &i_in, &psz_out, &i_out);
 745     if( ret == (size_t)(-1) || i_in )
 746     {
 747         msg_Warn( p_this, "Failed to convert \"%s\" to UTF-8", psz_local );
 748         return strdup( psz_local );
 749     }
 750     *psz_out = '\0';
 751     return psz_unicode;
 752 }