git.sesse.net Git - vlc/blob - 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_sep;
  56     unsigned        track_id;
  57     unsigned        port;
  58
  59     int             sessionc;
  60     rtsp_session_t **sessionv;
  61 };
  62
  63
  64 static int  RtspCallback( httpd_callback_sys_t *p_args,
  65                           httpd_client_t *cl, httpd_message_t *answer,
  66                           const httpd_message_t *query );
  67 static int  RtspCallbackId( httpd_callback_sys_t *p_args,
  68                             httpd_client_t *cl, httpd_message_t *answer,
  69                             const httpd_message_t *query );
  70 static void RtspClientDel( rtsp_stream_t *rtsp, rtsp_session_t *session );
  71
  72 rtsp_stream_t *RtspSetup( sout_stream_t *p_stream, const vlc_url_t *url )
  73 {
  74     rtsp_stream_t *rtsp = malloc( sizeof( *rtsp ) );
  75
  76     if( rtsp == NULL || ( url->i_port > 99999 ) )
  77     {
  78         free( rtsp );
  79         return NULL;
  80     }
  81
  82     rtsp->owner = p_stream;
  83     rtsp->sessionc = 0;
  84     rtsp->sessionv = NULL;
  85     rtsp->host = NULL;
  86     rtsp->url = NULL;
  87     rtsp->psz_path = NULL;
  88     rtsp->track_id = 0;
  89     vlc_mutex_init( &rtsp->lock );
  90
  91     rtsp->port = (url->i_port > 0) ? url->i_port : 554;
  92     rtsp->psz_path = strdup( ( url->psz_path != NULL ) ? url->psz_path : "/" );
  93     if( rtsp->psz_path == NULL )
  94         goto error;
  95
  96     assert( strlen( rtsp->psz_path ) > 0 );
  97     rtsp->track_sep = rtsp->psz_path[strlen( rtsp->psz_path ) - 1] == '/' ?
  98                       "" : "/";
  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     unsigned          track_id;
 154     uint32_t          ssrc;
 155     uint16_t          loport, hiport;
 156 };
 157
 158
 159 typedef struct rtsp_strack_t rtsp_strack_t;
 160
 161 /* For unicast streaming */
 162 struct rtsp_session_t
 163 {
 164     rtsp_stream_t *stream;
 165     uint64_t       id;
 166
 167     /* output (id-access) */
 168     int            trackc;
 169     rtsp_strack_t *trackv;
 170 };
 171
 172
 173 /* Unicast session track */
 174 struct rtsp_strack_t
 175 {
 176     rtsp_stream_id_t  *id;
 177     int                fd;
 178     bool         playing;
 179 };
 180
 181
 182 rtsp_stream_id_t *RtspAddId( rtsp_stream_t *rtsp, sout_stream_id_t *sid,
 183                              uint32_t ssrc,
 184                              /* Multicast stuff - TODO: cleanup */
 185                              const char *dst, int ttl,
 186                              unsigned loport, unsigned hiport )
 187 {
 188     char urlbuf[sizeof( "/trackID=123" ) + strlen( rtsp->psz_path )];
 189     rtsp_stream_id_t *id = malloc( sizeof( *id ) );
 190     httpd_url_t *url;
 191
 192     if( id == NULL )
 193         return NULL;
 194
 195     id->stream = rtsp;
 196     id->sout_id = sid;
 197     id->track_id = rtsp->track_id;
 198     id->ssrc = ssrc;
 199     /* TODO: can we assume that this need not be strdup'd? */
 200     id->dst = dst;
 201     if( id->dst != NULL )
 202     {
 203         id->ttl = ttl;
 204         id->loport = loport;
 205         id->hiport = hiport;
 206     }
 207
 208     snprintf( urlbuf, sizeof( urlbuf ), "%s%strackID=%u", rtsp->psz_path,
 209               rtsp->track_sep, id->track_id );
 210     msg_Dbg( rtsp->owner, "RTSP: adding %s", urlbuf );
 211     url = id->url = httpd_UrlNewUnique( rtsp->host, urlbuf, NULL, NULL, NULL );
 212
 213     if( url == NULL )
 214     {
 215         free( id );
 216         return NULL;
 217     }
 218
 219     httpd_UrlCatch( url, HTTPD_MSG_DESCRIBE, RtspCallbackId, (void *)id );
 220     httpd_UrlCatch( url, HTTPD_MSG_SETUP,    RtspCallbackId, (void *)id );
 221     httpd_UrlCatch( url, HTTPD_MSG_PLAY,     RtspCallbackId, (void *)id );
 222     httpd_UrlCatch( url, HTTPD_MSG_PAUSE,    RtspCallbackId, (void *)id );
 223     httpd_UrlCatch( url, HTTPD_MSG_GETPARAMETER, RtspCallbackId, (void *)id );
 224     httpd_UrlCatch( url, HTTPD_MSG_TEARDOWN, RtspCallbackId, (void *)id );
 225
 226     rtsp->track_id++;
 227
 228     return id;
 229 }
 230
 231
 232 void RtspDelId( rtsp_stream_t *rtsp, rtsp_stream_id_t *id )
 233 {
 234     vlc_mutex_lock( &rtsp->lock );
 235     for( int i = 0; i < rtsp->sessionc; i++ )
 236     {
 237         rtsp_session_t *ses = rtsp->sessionv[i];
 238
 239         for( int j = 0; j < ses->trackc; j++ )
 240         {
 241             if( ses->trackv[j].id == id )
 242             {
 243                 rtsp_strack_t *tr = ses->trackv + j;
 244                 net_Close( tr->fd );
 245                 REMOVE_ELEM( ses->trackv, ses->trackc, j );
 246             }
 247         }
 248     }
 249
 250     vlc_mutex_unlock( &rtsp->lock );
 251     httpd_UrlDelete( id->url );
 252     free( id );
 253 }
 254
 255
 256 /** rtsp must be locked */
 257 static
 258 rtsp_session_t *RtspClientNew( rtsp_stream_t *rtsp )
 259 {
 260     rtsp_session_t *s = malloc( sizeof( *s ) );
 261     if( s == NULL )
 262         return NULL;
 263
 264     s->stream = rtsp;
 265     vlc_rand_bytes (&s->id, sizeof (s->id));
 266     s->trackc = 0;
 267     s->trackv = NULL;
 268
 269     TAB_APPEND( rtsp->sessionc, rtsp->sessionv, s );
 270
 271     return s;
 272 }
 273
 274
 275 /** rtsp must be locked */
 276 static
 277 rtsp_session_t *RtspClientGet( rtsp_stream_t *rtsp, const char *name )
 278 {
 279     char *end;
 280     uint64_t id;
 281     int i;
 282
 283     if( name == NULL )
 284         return NULL;
 285
 286     errno = 0;
 287     id = strtoull( name, &end, 0x10 );
 288     if( errno || *end )
 289         return NULL;
 290
 291     /* FIXME: use a hash/dictionary */
 292     for( i = 0; i < rtsp->sessionc; i++ )
 293     {
 294         if( rtsp->sessionv[i]->id == id )
 295             return rtsp->sessionv[i];
 296     }
 297     return NULL;
 298 }
 299
 300
 301 /** rtsp must be locked */
 302 static
 303 void RtspClientDel( rtsp_stream_t *rtsp, rtsp_session_t *session )
 304 {
 305     int i;
 306     TAB_REMOVE( rtsp->sessionc, rtsp->sessionv, session );
 307
 308     for( i = 0; i < session->trackc; i++ )
 309         rtp_del_sink( session->trackv[i].id->sout_id, session->trackv[i].fd );
 310
 311     free( session->trackv );
 312     free( session );
 313 }
 314
 315
 316 /** Finds the next transport choice */
 317 static inline const char *transport_next( const char *str )
 318 {
 319     /* Looks for comma */
 320     str = strchr( str, ',' );
 321     if( str == NULL )
 322         return NULL; /* No more transport options */
 323
 324     str++; /* skips comma */
 325     while( strchr( "\r\n\t ", *str ) )
 326         str++;
 327
 328     return (*str) ? str : NULL;
 329 }
 330
 331
 332 /** Finds the next transport parameter */
 333 static inline const char *parameter_next( const char *str )
 334 {
 335     while( strchr( ",;", *str ) == NULL )
 336         str++;
 337
 338     return (*str == ';') ? (str + 1) : NULL;
 339 }
 340
 341
 342 /** RTSP requests handler
 343  * @param id selected track for non-aggregate URLs,
 344  *           NULL for aggregate URLs
 345  */
 346 static int RtspHandler( rtsp_stream_t *rtsp, rtsp_stream_id_t *id,
 347                         httpd_client_t *cl,
 348                         httpd_message_t *answer,
 349                         const httpd_message_t *query )
 350 {
 351     sout_stream_t *p_stream = rtsp->owner;
 352     char psz_sesbuf[17];
 353     const char *psz_session = NULL, *psz;
 354     char control[sizeof("rtsp://[]:12345") + NI_MAXNUMERICHOST
 355                   + strlen( rtsp->psz_path )];
 356     time_t now;
 357
 358     time (&now);
 359
 360     if( answer == NULL || query == NULL || cl == NULL )
 361         return VLC_SUCCESS;
 362     else
 363     {
 364         /* Build self-referential control URL */
 365         char ip[NI_MAXNUMERICHOST], *ptr;
 366
 367         httpd_ServerIP( cl, ip );
 368         ptr = strchr( ip, '%' );
 369         if( ptr != NULL )
 370             *ptr = '\0';
 371
 372         if( strchr( ip, ':' ) != NULL )
 373             sprintf( control, "rtsp://[%s]:%u%s", ip, rtsp->port,
 374                      rtsp->psz_path );
 375         else
 376             sprintf( control, "rtsp://%s:%u%s", ip, rtsp->port,
 377                      rtsp->psz_path );
 378     }
 379
 380     /* */
 381     answer->i_proto = HTTPD_PROTO_RTSP;
 382     answer->i_version= 0;
 383     answer->i_type   = HTTPD_MSG_ANSWER;
 384     answer->i_body = 0;
 385     answer->p_body = NULL;
 386
 387     httpd_MsgAdd( answer, "Server", "%s", PACKAGE_STRING );
 388
 389     /* Date: is always allowed, and sometimes mandatory with RTSP/2.0. */
 390     struct tm ut;
 391     if (gmtime_r (&now, &ut) != NULL)
 392     {   /* RFC1123 format, GMT is mandatory */
 393         static const char wdays[7][4] = {
 394             "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
 395         static const char mons[12][4] = {
 396             "Jan", "Feb", "Mar", "Apr", "May", "Jun",
 397             "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
 398         httpd_MsgAdd (answer, "Date", "%s, %02u %s %04u %02u:%02u:%02u GMT",
 399                       wdays[ut.tm_wday], ut.tm_mday, mons[ut.tm_mon],
 400                       1900 + ut.tm_year, ut.tm_hour, ut.tm_min, ut.tm_sec);
 401     }
 402
 403     if( query->i_proto != HTTPD_PROTO_RTSP )
 404     {
 405         answer->i_status = 505;
 406     }
 407     else
 408     if( httpd_MsgGet( query, "Require" ) != NULL )
 409     {
 410         answer->i_status = 551;
 411         httpd_MsgAdd( answer, "Unsupported", "%s",
 412                       httpd_MsgGet( query, "Require" ) );
 413     }
 414     else
 415     switch( query->i_type )
 416     {
 417         case HTTPD_MSG_DESCRIBE:
 418         {   /* Aggregate-only */
 419             if( id != NULL )
 420             {
 421                 answer->i_status = 460;
 422                 break;
 423             }
 424
 425             answer->i_status = 200;
 426             httpd_MsgAdd( answer, "Content-Type",  "%s", "application/sdp" );
 427             httpd_MsgAdd( answer, "Content-Base",  "%s", control );
 428             answer->p_body = (uint8_t *)SDPGenerate( rtsp->owner, control );
 429             if( answer->p_body != NULL )
 430                 answer->i_body = strlen( (char *)answer->p_body );
 431             else
 432                 answer->i_status = 500;
 433             break;
 434         }
 435
 436         case HTTPD_MSG_SETUP:
 437             /* Non-aggregate-only */
 438             if( id == NULL )
 439             {
 440                 answer->i_status = 459;
 441                 break;
 442             }
 443
 444             psz_session = httpd_MsgGet( query, "Session" );
 445             answer->i_status = 461;
 446
 447             for( const char *tpt = httpd_MsgGet( query, "Transport" );
 448                  tpt != NULL;
 449                  tpt = transport_next( tpt ) )
 450             {
 451                 bool b_multicast = true, b_unsupp = false;
 452                 unsigned loport = 5004, hiport = 5005; /* from RFC3551 */
 453
 454                 /* Check transport protocol. */
 455                 /* Currently, we only support RTP/AVP over UDP */
 456                 if( strncmp( tpt, "RTP/AVP", 7 ) )
 457                     continue;
 458                 tpt += 7;
 459                 if( strncmp( tpt, "/UDP", 4 ) == 0 )
 460                     tpt += 4;
 461                 if( strchr( ";,", *tpt ) == NULL )
 462                     continue;
 463
 464                 /* Parse transport options */
 465                 for( const char *opt = parameter_next( tpt );
 466                      opt != NULL;
 467                      opt = parameter_next( opt ) )
 468                 {
 469                     if( strncmp( opt, "multicast", 9 ) == 0)
 470                         b_multicast = true;
 471                     else
 472                     if( strncmp( opt, "unicast", 7 ) == 0 )
 473                         b_multicast = false;
 474                     else
 475                     if( sscanf( opt, "client_port=%u-%u", &loport, &hiport )
 476                                 == 2 )
 477                         ;
 478                     else
 479                     if( strncmp( opt, "mode=", 5 ) == 0 )
 480                     {
 481                         if( strncasecmp( opt + 5, "play", 4 )
 482                          && strncasecmp( opt + 5, "\"PLAY\"", 6 ) )
 483                         {
 484                             /* Not playing?! */
 485                             b_unsupp = true;
 486                             break;
 487                         }
 488                     }
 489                     else
 490                     if( strncmp( opt,"destination=", 12 ) == 0 )
 491                     {
 492                         answer->i_status = 403;
 493                         b_unsupp = true;
 494                     }
 495                     else
 496                     {
 497                     /*
 498                      * Every other option is unsupported:
 499                      *
 500                      * "source" and "append" are invalid (server-only);
 501                      * "ssrc" also (as clarified per RFC2326bis).
 502                      *
 503                      * For multicast, "port", "layers", "ttl" are set by the
 504                      * stream output configuration.
 505                      *
 506                      * For unicast, we want to decide "server_port" values.
 507                      *
 508                      * "interleaved" is not implemented.
 509                      */
 510                         b_unsupp = true;
 511                         break;
 512                     }
 513                 }
 514
 515                 if( b_unsupp )
 516                     continue;
 517
 518                 if( b_multicast )
 519                 {
 520                     const char *dst = id->dst;
 521                     if( dst == NULL )
 522                         continue;
 523
 524                     if( psz_session == NULL )
 525                     {
 526                         /* Create a dummy session ID */
 527                         snprintf( psz_sesbuf, sizeof( psz_sesbuf ), "%d",
 528                                   rand() );
 529                         psz_session = psz_sesbuf;
 530                     }
 531                     answer->i_status = 200;
 532
 533                     httpd_MsgAdd( answer, "Transport",
 534                                   "RTP/AVP/UDP;destination=%s;port=%u-%u;"
 535                                   "ttl=%d;mode=play",
 536                                   dst, id->loport, id->hiport,
 537                                   ( id->ttl > 0 ) ? id->ttl : 1 );
 538                 }
 539                 else
 540                 {
 541                     char ip[NI_MAXNUMERICHOST], src[NI_MAXNUMERICHOST];
 542                     rtsp_session_t *ses = NULL;
 543                     rtsp_strack_t track = { id, -1, false };
 544                     int sport;
 545
 546                     if( httpd_ClientIP( cl, ip ) == NULL )
 547                     {
 548                         answer->i_status = 500;
 549                         continue;
 550                     }
 551
 552                     track.fd = net_ConnectDgram( p_stream, ip, loport, -1,
 553                                                  IPPROTO_UDP );
 554                     if( track.fd == -1 )
 555                     {
 556                         msg_Err( p_stream,
 557                                  "cannot create RTP socket for %s port %u",
 558                                  ip, loport );
 559                         answer->i_status = 500;
 560                         continue;
 561                     }
 562
 563                     /* Ignore any unexpected incoming packet */
 564                     setsockopt (track.fd, SOL_SOCKET, SO_RCVBUF, &(int){ 0 },
 565                                 sizeof (int));
 566                     net_GetSockAddress( track.fd, src, &sport );
 567
 568                     vlc_mutex_lock( &rtsp->lock );
 569                     if( psz_session == NULL )
 570                     {
 571                         ses = RtspClientNew( rtsp );
 572                         snprintf( psz_sesbuf, sizeof( psz_sesbuf ), "%"PRIx64,
 573                                   ses->id );
 574                         psz_session = psz_sesbuf;
 575                     }
 576                     else
 577                     {
 578                         /* FIXME: we probably need to remove an access out,
 579                          * if there is already one for the same ID */
 580                         ses = RtspClientGet( rtsp, psz_session );
 581                         if( ses == NULL )
 582                         {
 583                             answer->i_status = 454;
 584                             vlc_mutex_unlock( &rtsp->lock );
 585                             continue;
 586                         }
 587                     }
 588
 589                     INSERT_ELEM( ses->trackv, ses->trackc, ses->trackc,
 590                                  track );
 591                     vlc_mutex_unlock( &rtsp->lock );
 592
 593                     httpd_ServerIP( cl, ip );
 594
 595                     if( strcmp( src, ip ) )
 596                     {
 597                         /* Specify source IP if it is different from the RTSP
 598                          * control connection server address */
 599                         char *ptr = strchr( src, '%' );
 600                         if( ptr != NULL ) *ptr = '\0'; /* remove scope ID */
 601
 602                         httpd_MsgAdd( answer, "Transport",
 603                                       "RTP/AVP/UDP;unicast;source=%s;"
 604                                       "client_port=%u-%u;server_port=%u-%u;"
 605                                       "ssrc=%08X;mode=play",
 606                                       src, loport, loport + 1, sport,
 607                                       sport + 1, id->ssrc );
 608                     }
 609                     else
 610                     {
 611                         httpd_MsgAdd( answer, "Transport",
 612                                       "RTP/AVP/UDP;unicast;"
 613                                       "client_port=%u-%u;server_port=%u-%u;"
 614                                       "ssrc=%08X;mode=play",
 615                                       loport, loport + 1, sport, sport + 1,
 616                                       id->ssrc );
 617                     }
 618
 619                     answer->i_status = 200;
 620                 }
 621                 break;
 622             }
 623             break;
 624
 625         case HTTPD_MSG_PLAY:
 626         {
 627             rtsp_session_t *ses;
 628             answer->i_status = 200;
 629
 630             psz_session = httpd_MsgGet( query, "Session" );
 631             const char *range = httpd_MsgGet (query, "Range");
 632             if (range && strncmp (range, "npt=", 4))
 633             {
 634                 answer->i_status = 501;
 635                 break;
 636             }
 637
 638             vlc_mutex_lock( &rtsp->lock );
 639             ses = RtspClientGet( rtsp, psz_session );
 640             if( ses != NULL )
 641             {
 642                 /* FIXME: we really need to limit the number of tracks... */
 643                 char info[ses->trackc * ( strlen( control )
 644                               + sizeof("url=/trackID=123;seq=65535;"
 645                                        "rtptime=4294967295, ") ) + 1];
 646                 size_t infolen = 0;
 647                 int64_t ts = rtp_get_ts( rtsp->owner );
 648
 649                 for( int i = 0; i < ses->trackc; i++ )
 650                 {
 651                     rtsp_strack_t *tr = ses->trackv + i;
 652                     if( ( id == NULL ) || ( tr->id == id ) )
 653                     {
 654                         uint16_t seq;
 655                         if( !tr->playing )
 656                         {
 657                             tr->playing = true;
 658                             rtp_add_sink( tr->id->sout_id, tr->fd, false,
 659                                           &seq );
 660                         }
 661                         else
 662                             seq = rtp_get_seq( tr->id->sout_id );
 663                         infolen += sprintf( info + infolen,
 664                                     "url=%s%strackID=%u;seq=%u;rtptime=%u, ",
 665                                     control, rtsp->track_sep,
 666                                     tr->id->track_id, seq,
 667                                     rtp_compute_ts( tr->id->sout_id, ts ) );
 668                     }
 669                 }
 670                 if( infolen > 0 )
 671                 {
 672                     info[infolen - 2] = '\0'; /* remove trailing ", " */
 673                     httpd_MsgAdd( answer, "RTP-Info", "%s", info );
 674                 }
 675             }
 676             vlc_mutex_unlock( &rtsp->lock );
 677
 678             if( httpd_MsgGet( query, "Scale" ) != NULL )
 679                 httpd_MsgAdd( answer, "Scale", "1." );
 680             break;
 681         }
 682
 683         case HTTPD_MSG_PAUSE:
 684             answer->i_status = 405;
 685             httpd_MsgAdd( answer, "Allow",
 686                           "%s, TEARDOWN, PLAY, GET_PARAMETER",
 687                           ( id != NULL ) ? "SETUP" : "DESCRIBE" );
 688             break;
 689
 690         case HTTPD_MSG_GETPARAMETER:
 691             if( query->i_body > 0 )
 692             {
 693                 answer->i_status = 451;
 694                 break;
 695             }
 696
 697             psz_session = httpd_MsgGet( query, "Session" );
 698             answer->i_status = 200;
 699             break;
 700
 701         case HTTPD_MSG_TEARDOWN:
 702         {
 703             rtsp_session_t *ses;
 704
 705             answer->i_status = 200;
 706
 707             psz_session = httpd_MsgGet( query, "Session" );
 708
 709             vlc_mutex_lock( &rtsp->lock );
 710             ses = RtspClientGet( rtsp, psz_session );
 711             if( ses != NULL )
 712             {
 713                 if( id == NULL ) /* Delete the entire session */
 714                     RtspClientDel( rtsp, ses );
 715                 else /* Delete one track from the session */
 716                 for( int i = 0; i < ses->trackc; i++ )
 717                 {
 718                     if( ses->trackv[i].id == id )
 719                     {
 720                         rtp_del_sink( id->sout_id, ses->trackv[i].fd );
 721                         REMOVE_ELEM( ses->trackv, ses->trackc, i );
 722                     }
 723                 }
 724             }
 725             vlc_mutex_unlock( &rtsp->lock );
 726             break;
 727         }
 728
 729         default:
 730             return VLC_EGENERIC;
 731     }
 732
 733     if( psz_session )
 734         httpd_MsgAdd( answer, "Session", "%s"/*;timeout=5*/, psz_session );
 735
 736     httpd_MsgAdd( answer, "Content-Length", "%d", answer->i_body );
 737     httpd_MsgAdd( answer, "Cache-Control", "no-cache" );
 738
 739     psz = httpd_MsgGet( query, "Cseq" );
 740     if( psz != NULL )
 741         httpd_MsgAdd( answer, "Cseq", "%s", psz );
 742     psz = httpd_MsgGet( query, "Timestamp" );
 743     if( psz != NULL )
 744         httpd_MsgAdd( answer, "Timestamp", "%s", psz );
 745
 746     return VLC_SUCCESS;
 747 }
 748
 749
 750 /** Aggregate RTSP callback */
 751 static int RtspCallback( httpd_callback_sys_t *p_args,
 752                          httpd_client_t *cl,
 753                          httpd_message_t *answer,
 754                          const httpd_message_t *query )
 755 {
 756     return RtspHandler( (rtsp_stream_t *)p_args, NULL, cl, answer, query );
 757 }
 758
 759
 760 /** Non-aggregate RTSP callback */
 761 static int RtspCallbackId( httpd_callback_sys_t *p_args,
 762                            httpd_client_t *cl,
 763                            httpd_message_t *answer,
 764                            const httpd_message_t *query )
 765 {
 766     rtsp_stream_id_t *id = (rtsp_stream_id_t *)p_args;
 767     return RtspHandler( id->stream, id, cl, answer, query );
 768 }