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 #   include <arpa/inet.h>
  46 #endif
  47 #include "charset.h"
  48
  49 /* SAP is always on that port */
  50 #define SAP_PORT 9875
  51
  52 #define DEFAULT_PORT "1234"
  53
  54 #undef EXTRA_DEBUG
  55
  56 /* SAP Specific structures */
  57
  58 /* 100ms */
  59 #define SAP_IDLE ((mtime_t)(0.100*CLOCK_FREQ))
  60 #define SAP_MAX_BUFFER 65534
  61 #define MIN_INTERVAL 2
  62 #define MAX_INTERVAL 300
  63
  64 /* A SAP announce address. For each of these, we run the
  65  * control flow algorithm */
  66 struct sap_address_t
  67 {
  68     char *psz_address;
  69     char psz_machine[NI_MAXNUMERICHOST];
  70     int i_port;
  71     int i_rfd; /* Read socket */
  72     int i_wfd; /* Write socket */
  73
  74     /* Used for flow control */
  75     mtime_t t1;
  76     vlc_bool_t b_enabled;
  77     vlc_bool_t b_ready;
  78     int i_interval;
  79     int i_buff;
  80     int i_limit;
  81 };
  82
  83 /*****************************************************************************
  84  * Local prototypes
  85  *****************************************************************************/
  86 static void RunThread( vlc_object_t *p_this);
  87 static int CalculateRate( sap_handler_t *p_sap, sap_address_t *p_address );
  88 static char *SDPGenerate( sap_handler_t *p_sap,
  89                           const session_descriptor_t *p_session,
  90                           const sap_address_t *p_addr );
  91
  92 static int announce_SendSAPAnnounce( sap_handler_t *p_sap,
  93                                      sap_session_t *p_session );
  94
  95
  96 static int announce_SAPAnnounceAdd( sap_handler_t *p_sap,
  97                              session_descriptor_t *p_session );
  98
  99 static int announce_SAPAnnounceDel( sap_handler_t *p_sap,
 100                              session_descriptor_t *p_session );
 101 static char *convert_to_utf8( struct sap_handler_t *p_this, char *psz_local );
 102
 103 #define FREE( p ) if( p ) { free( p ); (p) = NULL; }
 104
 105
 106 /**
 107  * Create the SAP handler
 108  *
 109  * \param p_announce the parent announce_handler
 110  * \return the newly created SAP handler or NULL on error
 111  */
 112 sap_handler_t *announce_SAPHandlerCreate( announce_handler_t *p_announce )
 113 {
 114     sap_handler_t *p_sap;
 115     char *psz_charset;
 116
 117     p_sap = vlc_object_create( p_announce, sizeof( sap_handler_t ) );
 118
 119     if( !p_sap )
 120     {
 121         msg_Err( p_announce, "out of memory" );
 122         return NULL;
 123     }
 124
 125     vlc_mutex_init( p_sap, &p_sap->object_lock );
 126
 127     vlc_current_charset( &psz_charset );
 128     p_sap->iconvHandle = vlc_iconv_open( "UTF-8", psz_charset );
 129     free( psz_charset );
 130     if( p_sap->iconvHandle == (vlc_iconv_t)(-1) )
 131         msg_Warn( p_sap, "Unable to do requested conversion" );
 132
 133     p_sap->pf_add = announce_SAPAnnounceAdd;
 134     p_sap->pf_del = announce_SAPAnnounceDel;
 135
 136     p_sap->i_sessions = 0;
 137     p_sap->i_addresses = 0;
 138     p_sap->i_current_session = 0;
 139
 140     p_sap->b_control = config_GetInt( p_sap, "sap-flow-control");
 141
 142     if( vlc_thread_create( p_sap, "sap handler", RunThread,
 143                        VLC_THREAD_PRIORITY_LOW, VLC_FALSE ) )
 144     {
 145         msg_Dbg( p_announce, "Unable to spawn SAP handler thread");
 146         free( p_sap );
 147         return NULL;
 148     };
 149     msg_Dbg( p_announce, "thread created, %i sessions", p_sap->i_sessions);
 150     return p_sap;
 151 }
 152
 153 /**
 154  *  Destroy the SAP handler
 155  *  \param p_this the SAP Handler to destroy
 156  *  \return nothing
 157  */
 158 void announce_SAPHandlerDestroy( sap_handler_t *p_sap )
 159 {
 160     int i;
 161
 162     vlc_mutex_destroy( &p_sap->object_lock );
 163
 164     /* Free the remaining sessions */
 165     for( i = 0 ; i< p_sap->i_sessions ; i++)
 166     {
 167         sap_session_t *p_session = p_sap->pp_sessions[i];
 168         FREE( p_session->psz_sdp );
 169         FREE( p_session->psz_data );
 170         REMOVE_ELEM( p_sap->pp_sessions, p_sap->i_sessions , i );
 171         FREE( p_session );
 172     }
 173
 174     /* Free the remaining addresses */
 175     for( i = 0 ; i< p_sap->i_addresses ; i++)
 176     {
 177         sap_address_t *p_address = p_sap->pp_addresses[i];
 178         FREE( p_address->psz_address );
 179         if( p_address->i_rfd > -1 )
 180         {
 181             net_Close( p_address->i_rfd );
 182         }
 183         if( p_address->i_wfd > -1 && p_sap->b_control )
 184         {
 185             net_Close( p_address->i_wfd );
 186         }
 187         REMOVE_ELEM( p_sap->pp_addresses, p_sap->i_addresses, i );
 188         FREE( p_address );
 189     }
 190
 191     if( p_sap->iconvHandle != (vlc_iconv_t)(-1) )
 192         vlc_iconv_close( p_sap->iconvHandle );
 193
 194     /* Free the structure */
 195     vlc_object_destroy( p_sap );
 196 }
 197
 198 /**
 199  * main SAP handler thread
 200  * \param p_this the SAP Handler object
 201  * \return nothing
 202  */
 203 static void RunThread( vlc_object_t *p_this)
 204 {
 205     sap_handler_t *p_sap = (sap_handler_t*)p_this;
 206     sap_session_t *p_session;
 207
 208     while( !p_sap->b_die )
 209     {
 210         int i;
 211
 212         /* If needed, get the rate info */
 213         if( p_sap->b_control == VLC_TRUE )
 214         {
 215             for( i = 0 ; i< p_sap->i_addresses ; i++)
 216             {
 217                 if( p_sap->pp_addresses[i]->b_enabled == VLC_TRUE )
 218                 {
 219                     CalculateRate( p_sap, p_sap->pp_addresses[i] );
 220                 }
 221             }
 222         }
 223
 224         /* Find the session to announce */
 225         vlc_mutex_lock( &p_sap->object_lock );
 226         if( p_sap->i_sessions > p_sap->i_current_session + 1)
 227         {
 228             p_sap->i_current_session++;
 229         }
 230         else if( p_sap->i_sessions > 0)
 231         {
 232             p_sap->i_current_session = 0;
 233         }
 234         else
 235         {
 236             vlc_mutex_unlock( &p_sap->object_lock );
 237             msleep( SAP_IDLE );
 238             continue;
 239         }
 240         p_session = p_sap->pp_sessions[p_sap->i_current_session];
 241         vlc_mutex_unlock( &p_sap->object_lock );
 242
 243         /* And announce it */
 244         if( p_session->p_address->b_enabled == VLC_TRUE &&
 245             p_session->p_address->b_ready == VLC_TRUE )
 246         {
 247             announce_SendSAPAnnounce( p_sap, p_session );
 248         }
 249
 250         msleep( SAP_IDLE );
 251     }
 252 }
 253
 254 /* Add a SAP announce */
 255 static int announce_SAPAnnounceAdd( sap_handler_t *p_sap,
 256                              session_descriptor_t *p_session )
 257 {
 258     int i_header_size, i;
 259     char *psz_head, psz_addr[NI_MAXNUMERICHOST];
 260     vlc_bool_t b_ipv6 = VLC_FALSE;
 261     sap_session_t *p_sap_session;
 262     mtime_t i_hash;
 263     struct addrinfo hints, *res;
 264     struct sockaddr_storage addr;
 265
 266     vlc_mutex_lock( &p_sap->object_lock );
 267
 268     if( p_session->psz_uri == NULL )
 269     {
 270         vlc_mutex_unlock( &p_sap->object_lock );
 271         msg_Err( p_sap, "*FIXME* Unexpected NULL URI for SAP announce" );
 272         msg_Err( p_sap, "This should not happen. VLC needs fixing." );
 273         return VLC_EGENERIC;
 274     }
 275
 276     /* Determine SAP multicast address automatically */
 277     memset( &hints, 0, sizeof( hints ) );
 278     hints.ai_socktype = SOCK_DGRAM;
 279     hints.ai_flags = AI_NUMERICHOST;
 280
 281     i = vlc_getaddrinfo( (vlc_object_t *)p_sap, p_session->psz_uri, 0,
 282                          &hints, &res );
 283     if( i )
 284     {
 285         vlc_mutex_unlock( &p_sap->object_lock );
 286         msg_Err( p_sap, "Invalid URI for SAP announce: %s: %s",
 287                  p_session->psz_uri, vlc_gai_strerror( i ) );
 288         return VLC_EGENERIC;
 289     }
 290
 291     if( (unsigned)res->ai_addrlen > sizeof( addr ) )
 292     {
 293         vlc_mutex_unlock( &p_sap->object_lock );
 294         vlc_freeaddrinfo( res );
 295         msg_Err( p_sap, "Unsupported address family of size %d > %u",
 296                  res->ai_addrlen, sizeof( addr ) );
 297         return VLC_EGENERIC;
 298     }
 299
 300     memcpy( &addr, res->ai_addr, res->ai_addrlen );
 301
 302     switch( addr.ss_family )
 303     {
 304 #if defined (HAVE_INET_PTON) || defined (WIN32)
 305         case AF_INET6:
 306         {
 307             /* See RFC3513 for list of valid IPv6 scopes */
 308             struct in6_addr *a6 = &((struct sockaddr_in6 *)&addr)->sin6_addr;
 309
 310             memcpy( a6->s6_addr + 2, "\x00\x00\x00\x00\x00\x00"
 311                    "\x00\x00\x00\x00\x00\x02\x7f\xfe", 14 );
 312             if( IN6_IS_ADDR_MULTICAST( a6 ) )
 313                  /* force flags to zero, preserve scope */
 314                 a6->s6_addr[1] &= 0xf;
 315             else
 316                 /* Unicast IPv6 - assume global scope */
 317                 memcpy( a6->s6_addr, "\xff\x0e", 2 );
 318
 319             b_ipv6 = VLC_TRUE;
 320             break;
 321         }
 322 #endif
 323
 324         case AF_INET:
 325         {
 326             /* See RFC2365 for IPv4 scopes */
 327             uint32_t ipv4;
 328
 329             ipv4 = ntohl( ((struct sockaddr_in *)&addr)->sin_addr.s_addr );
 330             /* 224.0.0.0/24 => 224.0.0.255 */
 331             if ((ipv4 & 0xffffff00) == 0xe0000000)
 332                 ipv4 =  0xe00000ff;
 333             else
 334             /* 239.255.0.0/16 => 239.255.255.255 */
 335             if ((ipv4 & 0xffff0000) == 0xefff0000)
 336                 ipv4 =  0xefffffff;
 337             else
 338             /* 239.192.0.0/14 => 239.195.255.255 */
 339             if ((ipv4 & 0xfffc0000) == 0xefc00000)
 340                 ipv4 =  0xefc3ffff;
 341             else
 342             /* other addresses => 224.2.127.254 */
 343                 ipv4 = 0xe0027ffe;
 344             break;
 345         }
 346
 347         default:
 348             vlc_mutex_unlock( &p_sap->object_lock );
 349             vlc_freeaddrinfo( res );
 350             msg_Err( p_sap, "Address family %d not supported by SAP",
 351                      addr.ss_family );
 352             return VLC_EGENERIC;
 353     }
 354
 355     i = vlc_getnameinfo( (struct sockaddr *)&addr, res->ai_addrlen,
 356                          psz_addr, sizeof( psz_addr ), NULL, NI_NUMERICHOST );
 357     vlc_freeaddrinfo( res );
 358
 359     if( i )
 360     {
 361         vlc_mutex_unlock( &p_sap->object_lock );
 362         msg_Err( p_sap, "%s", vlc_gai_strerror( i ) );
 363         return VLC_EGENERIC;
 364     }
 365
 366     msg_Dbg( p_sap, "using SAP address: %s", psz_addr);
 367
 368     /* XXX: Check for dupes */
 369     p_sap_session = (sap_session_t*)malloc(sizeof(sap_session_t));
 370     p_sap_session->p_address = NULL;
 371
 372     /* Add the address to the buffer */
 373     for( i = 0; i < p_sap->i_addresses; i++)
 374     {
 375         if( !strcmp( psz_addr, p_sap->pp_addresses[i]->psz_address ) )
 376         {
 377             p_sap_session->p_address = p_sap->pp_addresses[i];
 378             break;
 379         }
 380     }
 381
 382     if( p_sap_session->p_address == NULL )
 383     {
 384         sap_address_t *p_address = (sap_address_t *)
 385                                     malloc( sizeof(sap_address_t) );
 386         if( !p_address )
 387         {
 388             msg_Err( p_sap, "out of memory" );
 389             return VLC_ENOMEM;
 390         }
 391         p_address->psz_address = strdup( psz_addr );
 392         p_address->i_port  =  9875;
 393         p_address->i_wfd = net_OpenUDP( p_sap, "", 0, psz_addr,
 394                                         p_address->i_port );
 395         if( p_address->i_wfd != -1 )
 396         {
 397             char *ptr;
 398
 399             net_StopRecv( p_address->i_wfd );
 400             net_GetSockAddress( p_address->i_wfd, p_address->psz_machine,
 401                                 NULL );
 402
 403             /* removes scope if present */
 404             ptr = strchr( p_address->psz_machine, '%' );
 405             if( ptr != NULL )
 406                 *ptr = '\0';
 407         }
 408
 409         if( p_sap->b_control == VLC_TRUE )
 410         {
 411             p_address->i_rfd = net_OpenUDP( p_sap, psz_addr,
 412                                             p_address->i_port, "", 0 );
 413             if( p_address->i_rfd != -1 )
 414                 net_StopSend( p_address->i_rfd );
 415             p_address->i_buff = 0;
 416             p_address->b_enabled = VLC_TRUE;
 417             p_address->b_ready = VLC_FALSE;
 418             p_address->i_limit = 10000; /* 10000 bps */
 419             p_address->t1 = 0;
 420         }
 421         else
 422         {
 423             p_address->b_enabled = VLC_TRUE;
 424             p_address->b_ready = VLC_TRUE;
 425             p_address->i_interval = config_GetInt( p_sap,"sap-interval");
 426             p_address->i_rfd = -1;
 427         }
 428
 429         if( p_address->i_wfd == -1 || (p_address->i_rfd == -1
 430                                         && p_sap->b_control ) )
 431         {
 432             msg_Warn( p_sap, "disabling address" );
 433             p_address->b_enabled = VLC_FALSE;
 434         }
 435
 436         INSERT_ELEM( p_sap->pp_addresses,
 437                      p_sap->i_addresses,
 438                      p_sap->i_addresses,
 439                      p_address );
 440         p_sap_session->p_address = p_address;
 441     }
 442
 443
 444     /* Build the SAP Headers */
 445     i_header_size = ( b_ipv6 ? 16 : 4 ) + 20;
 446     psz_head = (char *) malloc( i_header_size * sizeof( char ) );
 447     if( psz_head == NULL )
 448     {
 449         msg_Err( p_sap, "out of memory" );
 450         return VLC_ENOMEM;
 451     }
 452
 453     /* SAPv1, not encrypted, not compressed */
 454     psz_head[0] = b_ipv6 ? 0x30 : 0x20;
 455     psz_head[1] = 0x00; /* No authentification length */
 456
 457     i_hash = mdate();
 458     psz_head[2] = (i_hash & 0xFF00) >> 8; /* Msg id hash */
 459     psz_head[3] = (i_hash & 0xFF);        /* Msg id hash 2 */
 460
 461     inet_pton( b_ipv6 ? AF_INET6 : AF_INET, /* can't fail */
 462                p_sap_session->p_address->psz_machine, psz_head + 4 );
 463
 464     memcpy( psz_head + (b_ipv6 ? 20 : 8), "application/sdp", 15 );
 465
 466     /* If needed, build the SDP */
 467     if( p_session->psz_sdp == NULL )
 468     {
 469         p_session->psz_sdp = SDPGenerate( p_sap, p_session,
 470                                           p_sap_session->p_address );
 471         if( p_session->psz_sdp == NULL )
 472         {
 473             vlc_mutex_unlock( &p_sap->object_lock );
 474             return VLC_ENOMEM;
 475         }
 476     }
 477
 478     p_sap_session->psz_sdp = strdup( p_session->psz_sdp );
 479     p_sap_session->i_last = 0;
 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 = (uint8_t *)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 != (int)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 char *SDPGenerate( sap_handler_t *p_sap,
 585                           const session_descriptor_t *p_session,
 586                           const sap_address_t *p_addr )
 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          *psz_sdp;
 592     char ipv;
 593
 594     psz_group = convert_to_utf8( p_sap, p_session->psz_group );
 595     psz_name = convert_to_utf8( p_sap, p_session->psz_name );
 596     if( psz_name == NULL )
 597     {
 598         FREE( psz_group );
 599         return NULL;
 600     }
 601
 602     /* FIXME: really check that psz_uri is a real IP address
 603      * FIXME: make a common function to obtain a canonical IP address */
 604     ipv = ( strchr( p_session->psz_uri, ':' )  != NULL) ? '6' : '4';
 605     if( *p_session->psz_uri == '[' )
 606     {
 607         char *ptr;
 608
 609         strncpy( psz_uribuf, p_session->psz_uri + 1, sizeof( psz_uribuf ) );
 610         psz_uribuf[sizeof( psz_uribuf ) - 1] = '\0';
 611         ptr = strchr( psz_uribuf, '%' );
 612         if( ptr != NULL)
 613             *ptr = '\0';
 614         ptr = strchr( psz_uribuf, ']' );
 615         if( ptr != NULL)
 616             *ptr = '\0';
 617         psz_uri = psz_uribuf;
 618     }
 619     else
 620         psz_uri = p_session->psz_uri;
 621
 622     /* see the lists in modules/stream_out/rtp.c for compliance stuff */
 623     if( asprintf( &psz_sdp,
 624                             "v=0\r\n"
 625                             "o=- "I64Fd" %d IN IP%c %s\r\n"
 626                             "s=%s\r\n"
 627                             "t=0 0\r\n"
 628                             "c=IN IP%c %s/%d\r\n"
 629                             "m=video %d udp %d\r\n"
 630                             "a=tool:"PACKAGE_STRING"\r\n"
 631                             "a=type:broadcast\r\n",
 632                             i_sdp_id, i_sdp_version,
 633                             ipv, p_addr->psz_machine,
 634                             psz_name, ipv,
 635                             psz_uri, p_session->i_ttl,
 636                             p_session->i_port, p_session->i_payload ) == -1 )
 637     {
 638         free( psz_name );
 639         FREE( psz_group );
 640         return NULL;
 641     }
 642
 643     free( psz_name );
 644
 645     if( psz_group )
 646     {
 647         /* FIXME: this is illegal use of sprintf */
 648         sprintf( psz_sdp, "%sa=x-plgroup:%s\r\n", psz_sdp, psz_group );
 649         free( psz_group );
 650     }
 651
 652     msg_Dbg( p_sap, "Generated SDP (%i bytes):\n%s", strlen(psz_sdp),
 653              psz_sdp );
 654     return psz_sdp;
 655 }
 656
 657 static int CalculateRate( sap_handler_t *p_sap, sap_address_t *p_address )
 658 {
 659     int i_read;
 660     uint8_t buffer[SAP_MAX_BUFFER];
 661     int i_tot = 0;
 662     mtime_t i_temp;
 663     int i_rate;
 664
 665     if( p_address->t1 == 0 )
 666     {
 667         p_address->t1 = mdate();
 668         return VLC_SUCCESS;
 669     }
 670     do
 671     {
 672         /* Might be too slow if we have huge data */
 673         i_read = net_ReadNonBlock( p_sap, p_address->i_rfd, NULL, buffer,
 674                                    SAP_MAX_BUFFER, 0 );
 675         i_tot += i_read;
 676     } while( i_read > 0 && i_tot < SAP_MAX_BUFFER );
 677
 678     i_temp = mdate();
 679
 680     /* We calculate the rate every 5 seconds */
 681     if( i_temp - p_address->t1 < 5000000 )
 682     {
 683         p_address->i_buff += i_tot;
 684         return VLC_SUCCESS;
 685     }
 686
 687     /* Bits/second */
 688     i_rate = (int)(8*1000000*((mtime_t)p_address->i_buff + (mtime_t)i_tot ) /
 689                         (i_temp - p_address->t1 ));
 690
 691     p_address->i_limit = 10000;
 692
 693     p_address->i_interval = ((1000*i_rate / p_address->i_limit) *
 694                             (MAX_INTERVAL - MIN_INTERVAL))/1000 + MIN_INTERVAL;
 695
 696     if( p_address->i_interval > MAX_INTERVAL || p_address->i_interval < 0 )
 697     {
 698         p_address->i_interval = MAX_INTERVAL;
 699     }
 700 #ifdef EXTRA_DEBUG
 701     msg_Dbg( p_sap,"%s:%i : Rate=%i, Interval = %i s",
 702                     p_address->psz_address,p_address->i_port,
 703                     i_rate,
 704                     p_address->i_interval );
 705 #endif
 706
 707     p_address->b_ready = VLC_TRUE;
 708
 709     p_address->t1 = i_temp;
 710     p_address->i_buff = 0;
 711
 712     return VLC_SUCCESS;
 713 }
 714
 715
 716 static char *convert_to_utf8( struct sap_handler_t *p_this, char *psz_local )
 717 {
 718     char *psz_unicode, *psz_in, *psz_out;
 719     size_t ret, i_in, i_out;
 720
 721     if( psz_local == NULL )
 722         return NULL;
 723     if ( p_this->iconvHandle == (vlc_iconv_t)(-1) )
 724         return strdup( psz_local );
 725
 726     psz_in = psz_local;
 727     i_in = strlen( psz_local );
 728
 729     i_out = 6 * i_in;
 730     psz_unicode = malloc( i_out + 1 );
 731     if( psz_unicode == NULL )
 732         return strdup( psz_local );
 733     psz_out = psz_unicode;
 734
 735     ret = vlc_iconv( p_this->iconvHandle,
 736                      &psz_in, &i_in, &psz_out, &i_out);
 737     if( ret == (size_t)(-1) || i_in )
 738     {
 739         msg_Warn( p_this, "Failed to convert \"%s\" to UTF-8", psz_local );
 740         free(psz_unicode);
 741         return strdup( psz_local );
 742     }
 743     *psz_out = '\0';
 744     return psz_unicode;
 745 }