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 char *RtspAppendTrackPath( rtsp_stream_id_t *id, const char *base )
 183 {
 184     assert( ( strlen( base ) > 0 && base[strlen( base ) - 1] == '/' )
 185             ^ ( id->stream->track_sep[0] == '/' ) );
 186
 187     char *url;
 188     if( asprintf( &url, "%s%strackID=%u", base, id->stream->track_sep,
 189                   id->track_id ) == -1 )
 190         url = NULL;
 191     return url;
 192 }
 193
 194
 195 rtsp_stream_id_t *RtspAddId( rtsp_stream_t *rtsp, sout_stream_id_t *sid,
 196                              uint32_t ssrc,
 197                              /* Multicast stuff - TODO: cleanup */
 198                              const char *dst, int ttl,
 199                              unsigned loport, unsigned hiport )
 200 {
 201     char urlbuf[sizeof( "/trackID=123" ) + strlen( rtsp->psz_path )];
 202     rtsp_stream_id_t *id = malloc( sizeof( *id ) );
 203     httpd_url_t *url;
 204
 205     if( id == NULL )
 206         return NULL;
 207
 208     id->stream = rtsp;
 209     id->sout_id = sid;
 210     id->track_id = rtsp->track_id;
 211     id->ssrc = ssrc;
 212     /* TODO: can we assume that this need not be strdup'd? */
 213     id->dst = dst;
 214     if( id->dst != NULL )
 215     {
 216         id->ttl = ttl;
 217         id->loport = loport;
 218         id->hiport = hiport;
 219     }
 220
 221     snprintf( urlbuf, sizeof( urlbuf ), "%s%strackID=%u", rtsp->psz_path,
 222               rtsp->track_sep, id->track_id );
 223     msg_Dbg( rtsp->owner, "RTSP: adding %s", urlbuf );
 224     url = id->url = httpd_UrlNewUnique( rtsp->host, urlbuf, NULL, NULL, NULL );
 225
 226     if( url == NULL )
 227     {
 228         free( id );
 229         return NULL;
 230     }
 231
 232     httpd_UrlCatch( url, HTTPD_MSG_DESCRIBE, RtspCallbackId, (void *)id );
 233     httpd_UrlCatch( url, HTTPD_MSG_SETUP,    RtspCallbackId, (void *)id );
 234     httpd_UrlCatch( url, HTTPD_MSG_PLAY,     RtspCallbackId, (void *)id );
 235     httpd_UrlCatch( url, HTTPD_MSG_PAUSE,    RtspCallbackId, (void *)id );
 236     httpd_UrlCatch( url, HTTPD_MSG_GETPARAMETER, RtspCallbackId, (void *)id );
 237     httpd_UrlCatch( url, HTTPD_MSG_TEARDOWN, RtspCallbackId, (void *)id );
 238
 239     rtsp->track_id++;
 240
 241     return id;
 242 }
 243
 244
 245 void RtspDelId( rtsp_stream_t *rtsp, rtsp_stream_id_t *id )
 246 {
 247     vlc_mutex_lock( &rtsp->lock );
 248     for( int i = 0; i < rtsp->sessionc; i++ )
 249     {
 250         rtsp_session_t *ses = rtsp->sessionv[i];
 251
 252         for( int j = 0; j < ses->trackc; j++ )
 253         {
 254             if( ses->trackv[j].id == id )
 255             {
 256                 rtsp_strack_t *tr = ses->trackv + j;
 257                 net_Close( tr->fd );
 258                 REMOVE_ELEM( ses->trackv, ses->trackc, j );
 259             }
 260         }
 261     }
 262
 263     vlc_mutex_unlock( &rtsp->lock );
 264     httpd_UrlDelete( id->url );
 265     free( id );
 266 }
 267
 268
 269 /** rtsp must be locked */
 270 static
 271 rtsp_session_t *RtspClientNew( rtsp_stream_t *rtsp )
 272 {
 273     rtsp_session_t *s = malloc( sizeof( *s ) );
 274     if( s == NULL )
 275         return NULL;
 276
 277     s->stream = rtsp;
 278     vlc_rand_bytes (&s->id, sizeof (s->id));
 279     s->trackc = 0;
 280     s->trackv = NULL;
 281
 282     TAB_APPEND( rtsp->sessionc, rtsp->sessionv, s );
 283
 284     return s;
 285 }
 286
 287
 288 /** rtsp must be locked */
 289 static
 290 rtsp_session_t *RtspClientGet( rtsp_stream_t *rtsp, const char *name )
 291 {
 292     char *end;
 293     uint64_t id;
 294     int i;
 295
 296     if( name == NULL )
 297         return NULL;
 298
 299     errno = 0;
 300     id = strtoull( name, &end, 0x10 );
 301     if( errno || *end )
 302         return NULL;
 303
 304     /* FIXME: use a hash/dictionary */
 305     for( i = 0; i < rtsp->sessionc; i++ )
 306     {
 307         if( rtsp->sessionv[i]->id == id )
 308             return rtsp->sessionv[i];
 309     }
 310     return NULL;
 311 }
 312
 313
 314 /** rtsp must be locked */
 315 static
 316 void RtspClientDel( rtsp_stream_t *rtsp, rtsp_session_t *session )
 317 {
 318     int i;
 319     TAB_REMOVE( rtsp->sessionc, rtsp->sessionv, session );
 320
 321     for( i = 0; i < session->trackc; i++ )
 322         rtp_del_sink( session->trackv[i].id->sout_id, session->trackv[i].fd );
 323
 324     free( session->trackv );
 325     free( session );
 326 }
 327
 328
 329 /** Finds the next transport choice */
 330 static inline const char *transport_next( const char *str )
 331 {
 332     /* Looks for comma */
 333     str = strchr( str, ',' );
 334     if( str == NULL )
 335         return NULL; /* No more transport options */
 336
 337     str++; /* skips comma */
 338     while( strchr( "\r\n\t ", *str ) )
 339         str++;
 340
 341     return (*str) ? str : NULL;
 342 }
 343
 344
 345 /** Finds the next transport parameter */
 346 static inline const char *parameter_next( const char *str )
 347 {
 348     while( strchr( ",;", *str ) == NULL )
 349         str++;
 350
 351     return (*str == ';') ? (str + 1) : NULL;
 352 }
 353
 354
 355 /** RTSP requests handler
 356  * @param id selected track for non-aggregate URLs,
 357  *           NULL for aggregate URLs
 358  */
 359 static int RtspHandler( rtsp_stream_t *rtsp, rtsp_stream_id_t *id,
 360                         httpd_client_t *cl,
 361                         httpd_message_t *answer,
 362                         const httpd_message_t *query )
 363 {
 364     sout_stream_t *p_stream = rtsp->owner;
 365     char psz_sesbuf[17];
 366     const char *psz_session = NULL, *psz;
 367     char control[sizeof("rtsp://[]:12345") + NI_MAXNUMERICHOST
 368                   + strlen( rtsp->psz_path )];
 369     time_t now;
 370
 371     time (&now);
 372
 373     if( answer == NULL || query == NULL || cl == NULL )
 374         return VLC_SUCCESS;
 375     else
 376     {
 377         /* Build self-referential control URL */
 378         char ip[NI_MAXNUMERICHOST], *ptr;
 379
 380         httpd_ServerIP( cl, ip );
 381         ptr = strchr( ip, '%' );
 382         if( ptr != NULL )
 383             *ptr = '\0';
 384
 385         if( strchr( ip, ':' ) != NULL )
 386             sprintf( control, "rtsp://[%s]:%u%s", ip, rtsp->port,
 387                      rtsp->psz_path );
 388         else
 389             sprintf( control, "rtsp://%s:%u%s", ip, rtsp->port,
 390                      rtsp->psz_path );
 391     }
 392
 393     /* */
 394     answer->i_proto = HTTPD_PROTO_RTSP;
 395     answer->i_version= 0;
 396     answer->i_type   = HTTPD_MSG_ANSWER;
 397     answer->i_body = 0;
 398     answer->p_body = NULL;
 399
 400     httpd_MsgAdd( answer, "Server", "%s", PACKAGE_STRING );
 401
 402     /* Date: is always allowed, and sometimes mandatory with RTSP/2.0. */
 403     struct tm ut;
 404     if (gmtime_r (&now, &ut) != NULL)
 405     {   /* RFC1123 format, GMT is mandatory */
 406         static const char wdays[7][4] = {
 407             "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
 408         static const char mons[12][4] = {
 409             "Jan", "Feb", "Mar", "Apr", "May", "Jun",
 410             "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
 411         httpd_MsgAdd (answer, "Date", "%s, %02u %s %04u %02u:%02u:%02u GMT",
 412                       wdays[ut.tm_wday], ut.tm_mday, mons[ut.tm_mon],
 413                       1900 + ut.tm_year, ut.tm_hour, ut.tm_min, ut.tm_sec);
 414     }
 415
 416     if( query->i_proto != HTTPD_PROTO_RTSP )
 417     {
 418         answer->i_status = 505;
 419     }
 420     else
 421     if( httpd_MsgGet( query, "Require" ) != NULL )
 422     {
 423         answer->i_status = 551;
 424         httpd_MsgAdd( answer, "Unsupported", "%s",
 425                       httpd_MsgGet( query, "Require" ) );
 426     }
 427     else
 428     switch( query->i_type )
 429     {
 430         case HTTPD_MSG_DESCRIBE:
 431         {   /* Aggregate-only */
 432             if( id != NULL )
 433             {
 434                 answer->i_status = 460;
 435                 break;
 436             }
 437
 438             answer->i_status = 200;
 439             httpd_MsgAdd( answer, "Content-Type",  "%s", "application/sdp" );
 440             httpd_MsgAdd( answer, "Content-Base",  "%s", control );
 441             answer->p_body = (uint8_t *)SDPGenerate( rtsp->owner, control );
 442             if( answer->p_body != NULL )
 443                 answer->i_body = strlen( (char *)answer->p_body );
 444             else
 445                 answer->i_status = 500;
 446             break;
 447         }
 448
 449         case HTTPD_MSG_SETUP:
 450             /* Non-aggregate-only */
 451             if( id == NULL )
 452             {
 453                 answer->i_status = 459;
 454                 break;
 455             }
 456
 457             psz_session = httpd_MsgGet( query, "Session" );
 458             answer->i_status = 461;
 459
 460             for( const char *tpt = httpd_MsgGet( query, "Transport" );
 461                  tpt != NULL;
 462                  tpt = transport_next( tpt ) )
 463             {
 464                 bool b_multicast = true, b_unsupp = false;
 465                 unsigned loport = 5004, hiport = 5005; /* from RFC3551 */
 466
 467                 /* Check transport protocol. */
 468                 /* Currently, we only support RTP/AVP over UDP */
 469                 if( strncmp( tpt, "RTP/AVP", 7 ) )
 470                     continue;
 471                 tpt += 7;
 472                 if( strncmp( tpt, "/UDP", 4 ) == 0 )
 473                     tpt += 4;
 474                 if( strchr( ";,", *tpt ) == NULL )
 475                     continue;
 476
 477                 /* Parse transport options */
 478                 for( const char *opt = parameter_next( tpt );
 479                      opt != NULL;
 480                      opt = parameter_next( opt ) )
 481                 {
 482                     if( strncmp( opt, "multicast", 9 ) == 0)
 483                         b_multicast = true;
 484                     else
 485                     if( strncmp( opt, "unicast", 7 ) == 0 )
 486                         b_multicast = false;
 487                     else
 488                     if( sscanf( opt, "client_port=%u-%u", &loport, &hiport )
 489                                 == 2 )
 490                         ;
 491                     else
 492                     if( strncmp( opt, "mode=", 5 ) == 0 )
 493                     {
 494                         if( strncasecmp( opt + 5, "play", 4 )
 495                          && strncasecmp( opt + 5, "\"PLAY\"", 6 ) )
 496                         {
 497                             /* Not playing?! */
 498                             b_unsupp = true;
 499                             break;
 500                         }
 501                     }
 502                     else
 503                     if( strncmp( opt,"destination=", 12 ) == 0 )
 504                     {
 505                         answer->i_status = 403;
 506                         b_unsupp = true;
 507                     }
 508                     else
 509                     {
 510                     /*
 511                      * Every other option is unsupported:
 512                      *
 513                      * "source" and "append" are invalid (server-only);
 514                      * "ssrc" also (as clarified per RFC2326bis).
 515                      *
 516                      * For multicast, "port", "layers", "ttl" are set by the
 517                      * stream output configuration.
 518                      *
 519                      * For unicast, we want to decide "server_port" values.
 520                      *
 521                      * "interleaved" is not implemented.
 522                      */
 523                         b_unsupp = true;
 524                         break;
 525                     }
 526                 }
 527
 528                 if( b_unsupp )
 529                     continue;
 530
 531                 if( b_multicast )
 532                 {
 533                     const char *dst = id->dst;
 534                     if( dst == NULL )
 535                         continue;
 536
 537                     if( psz_session == NULL )
 538                     {
 539                         /* Create a dummy session ID */
 540                         snprintf( psz_sesbuf, sizeof( psz_sesbuf ), "%d",
 541                                   rand() );
 542                         psz_session = psz_sesbuf;
 543                     }
 544                     answer->i_status = 200;
 545
 546                     httpd_MsgAdd( answer, "Transport",
 547                                   "RTP/AVP/UDP;destination=%s;port=%u-%u;"
 548                                   "ttl=%d;mode=play",
 549                                   dst, id->loport, id->hiport,
 550                                   ( id->ttl > 0 ) ? id->ttl : 1 );
 551                 }
 552                 else
 553                 {
 554                     char ip[NI_MAXNUMERICHOST], src[NI_MAXNUMERICHOST];
 555                     rtsp_session_t *ses = NULL;
 556                     rtsp_strack_t track = { id, -1, false };
 557                     int sport;
 558
 559                     if( httpd_ClientIP( cl, ip ) == NULL )
 560                     {
 561                         answer->i_status = 500;
 562                         continue;
 563                     }
 564
 565                     track.fd = net_ConnectDgram( p_stream, ip, loport, -1,
 566                                                  IPPROTO_UDP );
 567                     if( track.fd == -1 )
 568                     {
 569                         msg_Err( p_stream,
 570                                  "cannot create RTP socket for %s port %u",
 571                                  ip, loport );
 572                         answer->i_status = 500;
 573                         continue;
 574                     }
 575
 576                     /* Ignore any unexpected incoming packet */
 577                     setsockopt (track.fd, SOL_SOCKET, SO_RCVBUF, &(int){ 0 },
 578                                 sizeof (int));
 579                     net_GetSockAddress( track.fd, src, &sport );
 580
 581                     vlc_mutex_lock( &rtsp->lock );
 582                     if( psz_session == NULL )
 583                     {
 584                         ses = RtspClientNew( rtsp );
 585                         snprintf( psz_sesbuf, sizeof( psz_sesbuf ), "%"PRIx64,
 586                                   ses->id );
 587                         psz_session = psz_sesbuf;
 588                     }
 589                     else
 590                     {
 591                         /* FIXME: we probably need to remove an access out,
 592                          * if there is already one for the same ID */
 593                         ses = RtspClientGet( rtsp, psz_session );
 594                         if( ses == NULL )
 595                         {
 596                             answer->i_status = 454;
 597                             vlc_mutex_unlock( &rtsp->lock );
 598                             continue;
 599                         }
 600                     }
 601
 602                     INSERT_ELEM( ses->trackv, ses->trackc, ses->trackc,
 603                                  track );
 604                     vlc_mutex_unlock( &rtsp->lock );
 605
 606                     httpd_ServerIP( cl, ip );
 607
 608                     if( strcmp( src, ip ) )
 609                     {
 610                         /* Specify source IP if it is different from the RTSP
 611                          * control connection server address */
 612                         char *ptr = strchr( src, '%' );
 613                         if( ptr != NULL ) *ptr = '\0'; /* remove scope ID */
 614
 615                         httpd_MsgAdd( answer, "Transport",
 616                                       "RTP/AVP/UDP;unicast;source=%s;"
 617                                       "client_port=%u-%u;server_port=%u-%u;"
 618                                       "ssrc=%08X;mode=play",
 619                                       src, loport, loport + 1, sport,
 620                                       sport + 1, id->ssrc );
 621                     }
 622                     else
 623                     {
 624                         httpd_MsgAdd( answer, "Transport",
 625                                       "RTP/AVP/UDP;unicast;"
 626                                       "client_port=%u-%u;server_port=%u-%u;"
 627                                       "ssrc=%08X;mode=play",
 628                                       loport, loport + 1, sport, sport + 1,
 629                                       id->ssrc );
 630                     }
 631
 632                     answer->i_status = 200;
 633                 }
 634                 break;
 635             }
 636             break;
 637
 638         case HTTPD_MSG_PLAY:
 639         {
 640             rtsp_session_t *ses;
 641             answer->i_status = 200;
 642
 643             psz_session = httpd_MsgGet( query, "Session" );
 644             const char *range = httpd_MsgGet (query, "Range");
 645             if (range && strncmp (range, "npt=", 4))
 646             {
 647                 answer->i_status = 501;
 648                 break;
 649             }
 650
 651             vlc_mutex_lock( &rtsp->lock );
 652             ses = RtspClientGet( rtsp, psz_session );
 653             if( ses != NULL )
 654             {
 655                 /* FIXME: we really need to limit the number of tracks... */
 656                 char info[ses->trackc * ( strlen( control )
 657                               + sizeof("url=/trackID=123;seq=65535;"
 658                                        "rtptime=4294967295, ") ) + 1];
 659                 size_t infolen = 0;
 660                 int64_t ts = rtp_get_ts( rtsp->owner );
 661
 662                 for( int i = 0; i < ses->trackc; i++ )
 663                 {
 664                     rtsp_strack_t *tr = ses->trackv + i;
 665                     if( ( id == NULL ) || ( tr->id == id ) )
 666                     {
 667                         uint16_t seq;
 668                         if( !tr->playing )
 669                         {
 670                             tr->playing = true;
 671                             rtp_add_sink( tr->id->sout_id, tr->fd, false,
 672                                           &seq );
 673                         }
 674                         else
 675                             seq = rtp_get_seq( tr->id->sout_id );
 676                         infolen += sprintf( info + infolen,
 677                                     "url=%s%strackID=%u;seq=%u;rtptime=%u, ",
 678                                     control, rtsp->track_sep,
 679                                     tr->id->track_id, seq,
 680                                     rtp_compute_ts( tr->id->sout_id, ts ) );
 681                     }
 682                 }
 683                 if( infolen > 0 )
 684                 {
 685                     info[infolen - 2] = '\0'; /* remove trailing ", " */
 686                     httpd_MsgAdd( answer, "RTP-Info", "%s", info );
 687                 }
 688             }
 689             vlc_mutex_unlock( &rtsp->lock );
 690
 691             if( httpd_MsgGet( query, "Scale" ) != NULL )
 692                 httpd_MsgAdd( answer, "Scale", "1." );
 693             break;
 694         }
 695
 696         case HTTPD_MSG_PAUSE:
 697             answer->i_status = 405;
 698             httpd_MsgAdd( answer, "Allow",
 699                           "%s, TEARDOWN, PLAY, GET_PARAMETER",
 700                           ( id != NULL ) ? "SETUP" : "DESCRIBE" );
 701             break;
 702
 703         case HTTPD_MSG_GETPARAMETER:
 704             if( query->i_body > 0 )
 705             {
 706                 answer->i_status = 451;
 707                 break;
 708             }
 709
 710             psz_session = httpd_MsgGet( query, "Session" );
 711             answer->i_status = 200;
 712             break;
 713
 714         case HTTPD_MSG_TEARDOWN:
 715         {
 716             rtsp_session_t *ses;
 717
 718             answer->i_status = 200;
 719
 720             psz_session = httpd_MsgGet( query, "Session" );
 721
 722             vlc_mutex_lock( &rtsp->lock );
 723             ses = RtspClientGet( rtsp, psz_session );
 724             if( ses != NULL )
 725             {
 726                 if( id == NULL ) /* Delete the entire session */
 727                     RtspClientDel( rtsp, ses );
 728                 else /* Delete one track from the session */
 729                 for( int i = 0; i < ses->trackc; i++ )
 730                 {
 731                     if( ses->trackv[i].id == id )
 732                     {
 733                         rtp_del_sink( id->sout_id, ses->trackv[i].fd );
 734                         REMOVE_ELEM( ses->trackv, ses->trackc, i );
 735                     }
 736                 }
 737             }
 738             vlc_mutex_unlock( &rtsp->lock );
 739             break;
 740         }
 741
 742         default:
 743             return VLC_EGENERIC;
 744     }
 745
 746     if( psz_session )
 747         httpd_MsgAdd( answer, "Session", "%s"/*;timeout=5*/, psz_session );
 748
 749     httpd_MsgAdd( answer, "Content-Length", "%d", answer->i_body );
 750     httpd_MsgAdd( answer, "Cache-Control", "no-cache" );
 751
 752     psz = httpd_MsgGet( query, "Cseq" );
 753     if( psz != NULL )
 754         httpd_MsgAdd( answer, "Cseq", "%s", psz );
 755     psz = httpd_MsgGet( query, "Timestamp" );
 756     if( psz != NULL )
 757         httpd_MsgAdd( answer, "Timestamp", "%s", psz );
 758
 759     return VLC_SUCCESS;
 760 }
 761
 762
 763 /** Aggregate RTSP callback */
 764 static int RtspCallback( httpd_callback_sys_t *p_args,
 765                          httpd_client_t *cl,
 766                          httpd_message_t *answer,
 767                          const httpd_message_t *query )
 768 {
 769     return RtspHandler( (rtsp_stream_t *)p_args, NULL, cl, answer, query );
 770 }
 771
 772
 773 /** Non-aggregate RTSP callback */
 774 static int RtspCallbackId( httpd_callback_sys_t *p_args,
 775                            httpd_client_t *cl,
 776                            httpd_message_t *answer,
 777                            const httpd_message_t *query )
 778 {
 779     rtsp_stream_id_t *id = (rtsp_stream_id_t *)p_args;
 780     return RtspHandler( id->stream, id, cl, answer, query );
 781 }