modules/stream_out/rtsp.c

   1 /*****************************************************************************
   2  * rtsp.c: RTSP support for RTP stream output module
   3  *****************************************************************************
   4  * Copyright (C) 2003-2004 the VideoLAN team
   5  * Copyright © 2007 Rémi Denis-Courmont
   6  *
   7  * $Id$
   8  *
   9  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  24  *****************************************************************************/
  25
  26 /*****************************************************************************
  27  * Preamble
  28  *****************************************************************************/
  29 #ifdef HAVE_CONFIG_H
  30 # include "config.h"
  31 #endif
  32
  33 #include <vlc_common.h>
  34 #include <vlc_sout.h>
  35
  36 #include <vlc_httpd.h>
  37 #include <vlc_url.h>
  38 #include <vlc_network.h>
  39 #include <vlc_rand.h>
  40 #include <assert.h>
  41 #include <errno.h>
  42 #include <stdlib.h>
  43
  44 #include "rtp.h"
  45
  46 typedef struct rtsp_session_t rtsp_session_t;
  47
  48 struct rtsp_stream_t
  49 {
  50     vlc_mutex_t     lock;
  51     sout_stream_t  *owner;
  52     httpd_host_t   *host;
  53     httpd_url_t    *url;
  54     char           *psz_path;
  55     const char     *track_fmt;
  56     unsigned        port;
  57
  58     int             sessionc;
  59     rtsp_session_t **sessionv;
  60 };
  61
  62
  63 static int  RtspCallback( httpd_callback_sys_t *p_args,
  64                           httpd_client_t *cl, httpd_message_t *answer,
  65                           const httpd_message_t *query );
  66 static int  RtspCallbackId( httpd_callback_sys_t *p_args,
  67                             httpd_client_t *cl, httpd_message_t *answer,
  68                             const httpd_message_t *query );
  69 static void RtspClientDel( rtsp_stream_t *rtsp, rtsp_session_t *session );
  70
  71 rtsp_stream_t *RtspSetup( sout_stream_t *p_stream, const vlc_url_t *url )
  72 {
  73     rtsp_stream_t *rtsp = malloc( sizeof( *rtsp ) );
  74
  75     if( rtsp == NULL || ( url->i_port > 99999 ) )
  76     {
  77         free( rtsp );
  78         return NULL;
  79     }
  80
  81     rtsp->owner = p_stream;
  82     rtsp->sessionc = 0;
  83     rtsp->sessionv = NULL;
  84     rtsp->host = NULL;
  85     rtsp->url = NULL;
  86     rtsp->psz_path = NULL;
  87     vlc_mutex_init( &rtsp->lock );
  88
  89     rtsp->port = (url->i_port > 0) ? url->i_port : 554;
  90     rtsp->psz_path = strdup( ( url->psz_path != NULL ) ? url->psz_path : "/" );
  91     if( rtsp->psz_path == NULL )
  92         goto error;
  93
  94     assert( strlen( rtsp->psz_path ) > 0 );
  95     if( rtsp->psz_path[strlen( rtsp->psz_path ) - 1] == '/' )
  96         rtsp->track_fmt = "%strackID=%u";
  97     else
  98         rtsp->track_fmt = "%s/trackID=%u";
  99
 100     msg_Dbg( p_stream, "RTSP stream: host %s port %d at %s",
 101              url->psz_host, rtsp->port, rtsp->psz_path );
 102
 103     rtsp->host = httpd_HostNew( VLC_OBJECT(p_stream), url->psz_host,
 104                                 rtsp->port );
 105     if( rtsp->host == NULL )
 106         goto error;
 107
 108     rtsp->url = httpd_UrlNewUnique( rtsp->host, rtsp->psz_path,
 109                                     NULL, NULL, NULL );
 110     if( rtsp->url == NULL )
 111         goto error;
 112
 113     httpd_UrlCatch( rtsp->url, HTTPD_MSG_DESCRIBE, RtspCallback, (void*)rtsp );
 114     httpd_UrlCatch( rtsp->url, HTTPD_MSG_SETUP,    RtspCallback, (void*)rtsp );
 115     httpd_UrlCatch( rtsp->url, HTTPD_MSG_PLAY,     RtspCallback, (void*)rtsp );
 116     httpd_UrlCatch( rtsp->url, HTTPD_MSG_PAUSE,    RtspCallback, (void*)rtsp );
 117     httpd_UrlCatch( rtsp->url, HTTPD_MSG_GETPARAMETER, RtspCallback,
 118                     (void*)rtsp );
 119     httpd_UrlCatch( rtsp->url, HTTPD_MSG_TEARDOWN, RtspCallback, (void*)rtsp );
 120     return rtsp;
 121
 122 error:
 123     RtspUnsetup( rtsp );
 124     return NULL;
 125 }
 126
 127
 128 void RtspUnsetup( rtsp_stream_t *rtsp )
 129 {
 130     while( rtsp->sessionc > 0 )
 131         RtspClientDel( rtsp, rtsp->sessionv[0] );
 132
 133     if( rtsp->url )
 134         httpd_UrlDelete( rtsp->url );
 135
 136     if( rtsp->host )
 137         httpd_HostDelete( rtsp->host );
 138
 139     free( rtsp->psz_path );
 140     vlc_mutex_destroy( &rtsp->lock );
 141
 142     free( rtsp );
 143 }
 144
 145
 146 struct rtsp_stream_id_t
 147 {
 148     rtsp_stream_t    *stream;
 149     sout_stream_id_t *sout_id;
 150     httpd_url_t      *url;
 151     const char       *dst;
 152     int               ttl;
 153     uint32_t          ssrc;
 154     uint16_t          loport, hiport;
 155 };
 156
 157
 158 typedef struct rtsp_strack_t rtsp_strack_t;
 159
 160 /* For unicast streaming */
 161 struct rtsp_session_t
 162 {
 163     rtsp_stream_t *stream;
 164     uint64_t       id;
 165
 166     /* output (id-access) */
 167     int            trackc;
 168     rtsp_strack_t *trackv;
 169 };
 170
 171
 172 /* Unicast session track */
 173 struct rtsp_strack_t
 174 {
 175     sout_stream_id_t  *id;
 176     int                fd;
 177     bool         playing;
 178 };
 179
 180
 181 rtsp_stream_id_t *RtspAddId( rtsp_stream_t *rtsp, sout_stream_id_t *sid,
 182                              unsigned num, uint32_t ssrc,
 183                              /* Multicast stuff - TODO: cleanup */
 184                              const char *dst, int ttl,
 185                              unsigned loport, unsigned hiport )
 186 {
 187     char urlbuf[sizeof( "/trackID=123" ) + strlen( rtsp->psz_path )];
 188     rtsp_stream_id_t *id = malloc( sizeof( *id ) );
 189     httpd_url_t *url;
 190
 191     if( id == NULL )
 192         return NULL;
 193
 194     id->stream = rtsp;
 195     id->sout_id = sid;
 196     id->ssrc = ssrc;
 197     /* TODO: can we assume that this need not be strdup'd? */
 198     id->dst = dst;
 199     if( id->dst != NULL )
 200     {
 201         id->ttl = ttl;
 202         id->loport = loport;
 203         id->hiport = hiport;
 204     }
 205
 206     /* FIXME: num screws up if any ES has been removed and re-added */
 207     snprintf( urlbuf, sizeof( urlbuf ), rtsp->track_fmt, rtsp->psz_path,
 208               num );
 209     msg_Dbg( rtsp->owner, "RTSP: adding %s", urlbuf );
 210     url = id->url = httpd_UrlNewUnique( rtsp->host, urlbuf, NULL, NULL, NULL );
 211
 212     if( url == NULL )
 213     {
 214         free( id );
 215         return NULL;
 216     }
 217
 218     httpd_UrlCatch( url, HTTPD_MSG_DESCRIBE, RtspCallbackId, (void *)id );
 219     httpd_UrlCatch( url, HTTPD_MSG_SETUP,    RtspCallbackId, (void *)id );
 220     httpd_UrlCatch( url, HTTPD_MSG_PLAY,     RtspCallbackId, (void *)id );
 221     httpd_UrlCatch( url, HTTPD_MSG_PAUSE,    RtspCallbackId, (void *)id );
 222     httpd_UrlCatch( url, HTTPD_MSG_GETPARAMETER, RtspCallbackId, (void *)id );
 223     httpd_UrlCatch( url, HTTPD_MSG_TEARDOWN, RtspCallbackId, (void *)id );
 224
 225     return id;
 226 }
 227
 228
 229 void RtspDelId( rtsp_stream_t *rtsp, rtsp_stream_id_t *id )
 230 {
 231     vlc_mutex_lock( &rtsp->lock );
 232     for( int i = 0; i < rtsp->sessionc; i++ )
 233     {
 234         rtsp_session_t *ses = rtsp->sessionv[i];
 235
 236         for( int j = 0; j < ses->trackc; j++ )
 237         {
 238             if( ses->trackv[j].id == id->sout_id )
 239             {
 240                 rtsp_strack_t *tr = ses->trackv + j;
 241                 net_Close( tr->fd );
 242                 REMOVE_ELEM( ses->trackv, ses->trackc, j );
 243             }
 244         }
 245     }
 246
 247     vlc_mutex_unlock( &rtsp->lock );
 248     httpd_UrlDelete( id->url );
 249     free( id );
 250 }
 251
 252
 253 /** rtsp must be locked */
 254 static
 255 rtsp_session_t *RtspClientNew( rtsp_stream_t *rtsp )
 256 {
 257     rtsp_session_t *s = malloc( sizeof( *s ) );
 258     if( s == NULL )
 259         return NULL;
 260
 261     s->stream = rtsp;
 262     vlc_rand_bytes (&s->id, sizeof (s->id));
 263     s->trackc = 0;
 264     s->trackv = NULL;
 265
 266     TAB_APPEND( rtsp->sessionc, rtsp->sessionv, s );
 267
 268     return s;
 269 }
 270
 271
 272 /** rtsp must be locked */
 273 static
 274 rtsp_session_t *RtspClientGet( rtsp_stream_t *rtsp, const char *name )
 275 {
 276     char *end;
 277     uint64_t id;
 278     int i;
 279
 280     if( name == NULL )
 281         return NULL;
 282
 283     errno = 0;
 284     id = strtoull( name, &end, 0x10 );
 285     if( errno || *end )
 286         return NULL;
 287
 288     /* FIXME: use a hash/dictionary */
 289     for( i = 0; i < rtsp->sessionc; i++ )
 290     {
 291         if( rtsp->sessionv[i]->id == id )
 292             return rtsp->sessionv[i];
 293     }
 294     return NULL;
 295 }
 296
 297
 298 /** rtsp must be locked */
 299 static
 300 void RtspClientDel( rtsp_stream_t *rtsp, rtsp_session_t *session )
 301 {
 302     int i;
 303     TAB_REMOVE( rtsp->sessionc, rtsp->sessionv, session );
 304
 305     for( i = 0; i < session->trackc; i++ )
 306         rtp_del_sink( session->trackv[i].id, session->trackv[i].fd );
 307
 308     free( session->trackv );
 309     free( session );
 310 }
 311
 312
 313 /** Finds the next transport choice */
 314 static inline const char *transport_next( const char *str )
 315 {
 316     /* Looks for comma */
 317     str = strchr( str, ',' );
 318     if( str == NULL )
 319         return NULL; /* No more transport options */
 320
 321     str++; /* skips comma */
 322     while( strchr( "\r\n\t ", *str ) )
 323         str++;
 324
 325     return (*str) ? str : NULL;
 326 }
 327
 328
 329 /** Finds the next transport parameter */
 330 static inline const char *parameter_next( const char *str )
 331 {
 332     while( strchr( ",;", *str ) == NULL )
 333         str++;
 334
 335     return (*str == ';') ? (str + 1) : NULL;
 336 }
 337
 338
 339 /** RTSP requests handler
 340  * @param id selected track for non-aggregate URLs,
 341  *           NULL for aggregate URLs
 342  */
 343 static int RtspHandler( rtsp_stream_t *rtsp, rtsp_stream_id_t *id,
 344                         httpd_client_t *cl,
 345                         httpd_message_t *answer,
 346                         const httpd_message_t *query )
 347 {
 348     sout_stream_t *p_stream = rtsp->owner;
 349     char psz_sesbuf[17];
 350     const char *psz_session = NULL, *psz;
 351     char control[sizeof("rtsp://[]:12345") + NI_MAXNUMERICHOST
 352                   + strlen( rtsp->psz_path )];
 353     time_t now;
 354
 355     time (&now);
 356
 357     if( answer == NULL || query == NULL || cl == NULL )
 358         return VLC_SUCCESS;
 359     else
 360     {
 361         /* Build self-referential control URL */
 362         char ip[NI_MAXNUMERICHOST], *ptr;
 363
 364         httpd_ServerIP( cl, ip );
 365         ptr = strchr( ip, '%' );
 366         if( ptr != NULL )
 367             *ptr = '\0';
 368
 369         if( strchr( ip, ':' ) != NULL )
 370             sprintf( control, "rtsp://[%s]:%u%s", ip, rtsp->port,
 371                      rtsp->psz_path );
 372         else
 373             sprintf( control, "rtsp://%s:%u%s", ip, rtsp->port,
 374                      rtsp->psz_path );
 375     }
 376
 377     /* */
 378     answer->i_proto = HTTPD_PROTO_RTSP;
 379     answer->i_version= 0;
 380     answer->i_type   = HTTPD_MSG_ANSWER;
 381     answer->i_body = 0;
 382     answer->p_body = NULL;
 383
 384     httpd_MsgAdd( answer, "Server", "%s", PACKAGE_STRING );
 385
 386     /* Date: is always allowed, and sometimes mandatory with RTSP/2.0. */
 387     struct tm ut;
 388     if (gmtime_r (&now, &ut) != NULL)
 389     {   /* RFC1123 format, GMT is mandatory */
 390         static const char wdays[7][4] = {
 391             "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
 392         static const char mons[12][4] = {
 393             "Jan", "Feb", "Mar", "Apr", "May", "Jun",
 394             "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
 395         httpd_MsgAdd (answer, "Date", "%s, %02u %s %04u %02u:%02u:%02u GMT",
 396                       wdays[ut.tm_wday], ut.tm_mday, mons[ut.tm_mon],
 397                       1900 + ut.tm_year, ut.tm_hour, ut.tm_min, ut.tm_sec);
 398     }
 399
 400     if( query->i_proto != HTTPD_PROTO_RTSP )
 401     {
 402         answer->i_status = 505;
 403     }
 404     else
 405     if( httpd_MsgGet( query, "Require" ) != NULL )
 406     {
 407         answer->i_status = 551;
 408         httpd_MsgAdd( answer, "Unsupported", "%s",
 409                       httpd_MsgGet( query, "Require" ) );
 410     }
 411     else
 412     switch( query->i_type )
 413     {
 414         case HTTPD_MSG_DESCRIBE:
 415         {   /* Aggregate-only */
 416             if( id != NULL )
 417             {
 418                 answer->i_status = 460;
 419                 break;
 420             }
 421
 422             answer->i_status = 200;
 423             httpd_MsgAdd( answer, "Content-Type",  "%s", "application/sdp" );
 424             httpd_MsgAdd( answer, "Content-Base",  "%s", control );
 425             answer->p_body = (uint8_t *)SDPGenerate( rtsp->owner, control );
 426             if( answer->p_body != NULL )
 427                 answer->i_body = strlen( (char *)answer->p_body );
 428             else
 429                 answer->i_status = 500;
 430             break;
 431         }
 432
 433         case HTTPD_MSG_SETUP:
 434             /* Non-aggregate-only */
 435             if( id == NULL )
 436             {
 437                 answer->i_status = 459;
 438                 break;
 439             }
 440
 441             psz_session = httpd_MsgGet( query, "Session" );
 442             answer->i_status = 461;
 443
 444             for( const char *tpt = httpd_MsgGet( query, "Transport" );
 445                  tpt != NULL;
 446                  tpt = transport_next( tpt ) )
 447             {
 448                 bool b_multicast = true, b_unsupp = false;
 449                 unsigned loport = 5004, hiport = 5005; /* from RFC3551 */
 450
 451                 /* Check transport protocol. */
 452                 /* Currently, we only support RTP/AVP over UDP */
 453                 if( strncmp( tpt, "RTP/AVP", 7 ) )
 454                     continue;
 455                 tpt += 7;
 456                 if( strncmp( tpt, "/UDP", 4 ) == 0 )
 457                     tpt += 4;
 458                 if( strchr( ";,", *tpt ) == NULL )
 459                     continue;
 460
 461                 /* Parse transport options */
 462                 for( const char *opt = parameter_next( tpt );
 463                      opt != NULL;
 464                      opt = parameter_next( opt ) )
 465                 {
 466                     if( strncmp( opt, "multicast", 9 ) == 0)
 467                         b_multicast = true;
 468                     else
 469                     if( strncmp( opt, "unicast", 7 ) == 0 )
 470                         b_multicast = false;
 471                     else
 472                     if( sscanf( opt, "client_port=%u-%u", &loport, &hiport )
 473                                 == 2 )
 474                         ;
 475                     else
 476                     if( strncmp( opt, "mode=", 5 ) == 0 )
 477                     {
 478                         if( strncasecmp( opt + 5, "play", 4 )
 479                          && strncasecmp( opt + 5, "\"PLAY\"", 6 ) )
 480                         {
 481                             /* Not playing?! */
 482                             b_unsupp = true;
 483                             break;
 484                         }
 485                     }
 486                     else
 487                     if( strncmp( opt,"destination=", 12 ) == 0 )
 488                     {
 489                         answer->i_status = 403;
 490                         b_unsupp = true;
 491                     }
 492                     else
 493                     {
 494                     /*
 495                      * Every other option is unsupported:
 496                      *
 497                      * "source" and "append" are invalid (server-only);
 498                      * "ssrc" also (as clarified per RFC2326bis).
 499                      *
 500                      * For multicast, "port", "layers", "ttl" are set by the
 501                      * stream output configuration.
 502                      *
 503                      * For unicast, we want to decide "server_port" values.
 504                      *
 505                      * "interleaved" is not implemented.
 506                      */
 507                         b_unsupp = true;
 508                         break;
 509                     }
 510                 }
 511
 512                 if( b_unsupp )
 513                     continue;
 514
 515                 if( b_multicast )
 516                 {
 517                     const char *dst = id->dst;
 518                     if( dst == NULL )
 519                         continue;
 520
 521                     if( psz_session == NULL )
 522                     {
 523                         /* Create a dummy session ID */
 524                         snprintf( psz_sesbuf, sizeof( psz_sesbuf ), "%d",
 525                                   rand() );
 526                         psz_session = psz_sesbuf;
 527                     }
 528                     answer->i_status = 200;
 529
 530                     httpd_MsgAdd( answer, "Transport",
 531                                   "RTP/AVP/UDP;destination=%s;port=%u-%u;"
 532                                   "ttl=%d;mode=play",
 533                                   dst, id->loport, id->hiport,
 534                                   ( id->ttl > 0 ) ? id->ttl : 1 );
 535                 }
 536                 else
 537                 {
 538                     char ip[NI_MAXNUMERICHOST], src[NI_MAXNUMERICHOST];
 539                     rtsp_session_t *ses = NULL;
 540                     rtsp_strack_t track = { id->sout_id, -1, false };
 541                     int sport;
 542
 543                     if( httpd_ClientIP( cl, ip ) == NULL )
 544                     {
 545                         answer->i_status = 500;
 546                         continue;
 547                     }
 548
 549                     track.fd = net_ConnectDgram( p_stream, ip, loport, -1,
 550                                                  IPPROTO_UDP );
 551                     if( track.fd == -1 )
 552                     {
 553                         msg_Err( p_stream,
 554                                  "cannot create RTP socket for %s port %u",
 555                                  ip, loport );
 556                         answer->i_status = 500;
 557                         continue;
 558                     }
 559
 560                     net_GetSockAddress( track.fd, src, &sport );
 561
 562                     vlc_mutex_lock( &rtsp->lock );
 563                     if( psz_session == NULL )
 564                     {
 565                         ses = RtspClientNew( rtsp );
 566                         snprintf( psz_sesbuf, sizeof( psz_sesbuf ), "%"PRIx64,
 567                                   ses->id );
 568                         psz_session = psz_sesbuf;
 569                     }
 570                     else
 571                     {
 572                         /* FIXME: we probably need to remove an access out,
 573                          * if there is already one for the same ID */
 574                         ses = RtspClientGet( rtsp, psz_session );
 575                         if( ses == NULL )
 576                         {
 577                             answer->i_status = 454;
 578                             vlc_mutex_unlock( &rtsp->lock );
 579                             continue;
 580                         }
 581                     }
 582
 583                     INSERT_ELEM( ses->trackv, ses->trackc, ses->trackc,
 584                                  track );
 585                     vlc_mutex_unlock( &rtsp->lock );
 586
 587                     httpd_ServerIP( cl, ip );
 588
 589                     if( strcmp( src, ip ) )
 590                     {
 591                         /* Specify source IP if it is different from the RTSP
 592                          * control connection server address */
 593                         char *ptr = strchr( src, '%' );
 594                         if( ptr != NULL ) *ptr = '\0'; /* remove scope ID */
 595
 596                         httpd_MsgAdd( answer, "Transport",
 597                                       "RTP/AVP/UDP;unicast;source=%s;"
 598                                       "client_port=%u-%u;server_port=%u-%u;"
 599                                       "ssrc=%08X;mode=play",
 600                                       src, loport, loport + 1, sport,
 601                                       sport + 1, id->ssrc );
 602                     }
 603                     else
 604                     {
 605                         httpd_MsgAdd( answer, "Transport",
 606                                       "RTP/AVP/UDP;unicast;"
 607                                       "client_port=%u-%u;server_port=%u-%u;"
 608                                       "ssrc=%08X;mode=play",
 609                                       loport, loport + 1, sport, sport + 1,
 610                                       id->ssrc );
 611                     }
 612
 613                     answer->i_status = 200;
 614                 }
 615                 break;
 616             }
 617             break;
 618
 619         case HTTPD_MSG_PLAY:
 620         {
 621             rtsp_session_t *ses;
 622             answer->i_status = 200;
 623
 624             psz_session = httpd_MsgGet( query, "Session" );
 625             const char *range = httpd_MsgGet (query, "Range");
 626             if (range && strncmp (range, "npt=", 4))
 627             {
 628                 answer->i_status = 501;
 629                 break;
 630             }
 631
 632             vlc_mutex_lock( &rtsp->lock );
 633             ses = RtspClientGet( rtsp, psz_session );
 634             if( ses != NULL )
 635             {
 636                 /* FIXME: we really need to limit the number of tracks... */
 637                 char info[ses->trackc * ( strlen( control )
 638                                   + sizeof("/trackID=123;seq=65535, ") ) + 1];
 639                 size_t infolen = 0;
 640
 641                 for( int i = 0; i < ses->trackc; i++ )
 642                 {
 643                     rtsp_strack_t *tr = ses->trackv + i;
 644                     if( ( id == NULL ) || ( tr->id == id->sout_id ) )
 645                     {
 646                         if( !tr->playing )
 647                         {
 648                             tr->playing = true;
 649                             rtp_add_sink( tr->id, tr->fd, false );
 650                         }
 651                         infolen += sprintf( info + infolen,
 652                                             "%s/trackID=%u;seq=%u, ", control,
 653                                             rtp_get_num( tr->id ),
 654                                             rtp_get_seq( tr->id ) );
 655                     }
 656                 }
 657                 if( infolen > 0 )
 658                 {
 659                     info[infolen - 2] = '\0'; /* remove trailing ", " */
 660                     httpd_MsgAdd( answer, "RTP-Info", "%s", info );
 661                 }
 662             }
 663             vlc_mutex_unlock( &rtsp->lock );
 664
 665             if( httpd_MsgGet( query, "Scale" ) != NULL )
 666                 httpd_MsgAdd( answer, "Scale", "1." );
 667             break;
 668         }
 669
 670         case HTTPD_MSG_PAUSE:
 671             answer->i_status = 405;
 672             httpd_MsgAdd( answer, "Allow",
 673                           "%s, TEARDOWN, PLAY, GET_PARAMETER",
 674                           ( id != NULL ) ? "SETUP" : "DESCRIBE" );
 675             break;
 676
 677         case HTTPD_MSG_GETPARAMETER:
 678             if( query->i_body > 0 )
 679             {
 680                 answer->i_status = 451;
 681                 break;
 682             }
 683
 684             psz_session = httpd_MsgGet( query, "Session" );
 685             answer->i_status = 200;
 686             break;
 687
 688         case HTTPD_MSG_TEARDOWN:
 689         {
 690             rtsp_session_t *ses;
 691
 692             answer->i_status = 200;
 693
 694             psz_session = httpd_MsgGet( query, "Session" );
 695
 696             vlc_mutex_lock( &rtsp->lock );
 697             ses = RtspClientGet( rtsp, psz_session );
 698             if( ses != NULL )
 699             {
 700                 if( id == NULL ) /* Delete the entire session */
 701                     RtspClientDel( rtsp, ses );
 702                 else /* Delete one track from the session */
 703                 for( int i = 0; i < ses->trackc; i++ )
 704                 {
 705                     if( ses->trackv[i].id == id->sout_id )
 706                     {
 707                         rtp_del_sink( id->sout_id, ses->trackv[i].fd );
 708                         REMOVE_ELEM( ses->trackv, ses->trackc, i );
 709                     }
 710                 }
 711             }
 712             vlc_mutex_unlock( &rtsp->lock );
 713             break;
 714         }
 715
 716         default:
 717             return VLC_EGENERIC;
 718     }
 719
 720     if( psz_session )
 721         httpd_MsgAdd( answer, "Session", "%s"/*;timeout=5*/, psz_session );
 722
 723     httpd_MsgAdd( answer, "Content-Length", "%d", answer->i_body );
 724     httpd_MsgAdd( answer, "Cache-Control", "no-cache" );
 725
 726     psz = httpd_MsgGet( query, "Cseq" );
 727     if( psz != NULL )
 728         httpd_MsgAdd( answer, "Cseq", "%s", psz );
 729     psz = httpd_MsgGet( query, "Timestamp" );
 730     if( psz != NULL )
 731         httpd_MsgAdd( answer, "Timestamp", "%s", psz );
 732
 733     return VLC_SUCCESS;
 734 }
 735
 736
 737 /** Aggregate RTSP callback */
 738 static int RtspCallback( httpd_callback_sys_t *p_args,
 739                          httpd_client_t *cl,
 740                          httpd_message_t *answer,
 741                          const httpd_message_t *query )
 742 {
 743     return RtspHandler( (rtsp_stream_t *)p_args, NULL, cl, answer, query );
 744 }
 745
 746
 747 /** Non-aggregate RTSP callback */
 748 static int RtspCallbackId( httpd_callback_sys_t *p_args,
 749                            httpd_client_t *cl,
 750                            httpd_message_t *answer,
 751                            const httpd_message_t *query )
 752 {
 753     rtsp_stream_id_t *id = (rtsp_stream_id_t *)p_args;
 754     return RtspHandler( id->stream, id, cl, answer, query );
 755 }