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: rtp.c 21407 2007-08-22 20:10:41Z courmisch $
   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 #include <vlc/vlc.h>
  30 #include <vlc_sout.h>
  31
  32 #include <vlc_httpd.h>
  33 #include <vlc_url.h>
  34 #include <vlc_network.h>
  35 #include <assert.h>
  36 #include <errno.h>
  37 #include <stdlib.h>
  38
  39 #include "rtp.h"
  40
  41 typedef struct rtsp_session_t rtsp_session_t;
  42
  43 struct rtsp_stream_t
  44 {
  45     vlc_mutex_t     lock;
  46     sout_stream_t  *owner;
  47     httpd_host_t   *host;
  48     httpd_url_t    *url;
  49     char           *psz_path;
  50     unsigned        port;
  51
  52     int             sessionc;
  53     rtsp_session_t **sessionv;
  54 };
  55
  56
  57 static int  RtspCallback( httpd_callback_sys_t *p_args,
  58                           httpd_client_t *cl, httpd_message_t *answer,
  59                           const httpd_message_t *query );
  60 static int  RtspCallbackId( httpd_callback_sys_t *p_args,
  61                             httpd_client_t *cl, httpd_message_t *answer,
  62                             const httpd_message_t *query );
  63 static void RtspClientDel( rtsp_stream_t *rtsp, rtsp_session_t *session );
  64
  65 rtsp_stream_t *RtspSetup( sout_stream_t *p_stream, const vlc_url_t *url )
  66 {
  67     rtsp_stream_t *rtsp = malloc( sizeof( *rtsp ) );
  68
  69     if( rtsp == NULL || ( url->i_port > 99999 ) )
  70         return NULL;
  71
  72     rtsp->owner = p_stream;
  73     rtsp->sessionc = 0;
  74     rtsp->sessionv = NULL;
  75     vlc_mutex_init( p_stream, &rtsp->lock );
  76
  77     msg_Dbg( p_stream, "rtsp setup: %s : %d / %s\n",
  78              url->psz_host, url->i_port, url->psz_path );
  79
  80     rtsp->port = (url->i_port > 0) ? url->i_port : 554;
  81     if( url->psz_path != NULL )
  82         rtsp->psz_path = strdup( url->psz_path + 1 );
  83     else
  84         rtsp->psz_path = NULL;
  85
  86 #if 0
  87     if( asprintf( &rtsp->psz_control, "rtsp://%s:%d%s",
  88                   url->psz_host,  url->i_port > 0 ? url->i_port : 554,
  89                   rtsp->psz_path ) == -1 )
  90     {
  91         rtsp->psz_control = NULL;
  92         goto error;
  93     }
  94 #endif
  95
  96     rtsp->host = httpd_HostNew( VLC_OBJECT(p_stream), url->psz_host,
  97                                 rtsp->port );
  98     if( rtsp->host == NULL )
  99         goto error;
 100
 101     rtsp->url = httpd_UrlNewUnique( rtsp->host,
 102                                     url->psz_path ? url->psz_path : "/", NULL,
 103                                     NULL, NULL );
 104     if( rtsp->url == NULL )
 105         goto error;
 106
 107     httpd_UrlCatch( rtsp->url, HTTPD_MSG_DESCRIBE, RtspCallback, (void*)rtsp );
 108     httpd_UrlCatch( rtsp->url, HTTPD_MSG_SETUP,    RtspCallback, (void*)rtsp );
 109     httpd_UrlCatch( rtsp->url, HTTPD_MSG_PLAY,     RtspCallback, (void*)rtsp );
 110     httpd_UrlCatch( rtsp->url, HTTPD_MSG_PAUSE,    RtspCallback, (void*)rtsp );
 111     httpd_UrlCatch( rtsp->url, HTTPD_MSG_GETPARAMETER, RtspCallback,
 112                     (void*)rtsp );
 113     httpd_UrlCatch( rtsp->url, HTTPD_MSG_TEARDOWN, RtspCallback, (void*)rtsp );
 114     return rtsp;
 115
 116 error:
 117     RtspUnsetup( rtsp );
 118     return NULL;
 119 }
 120
 121
 122 void RtspUnsetup( rtsp_stream_t *rtsp )
 123 {
 124     while( rtsp->sessionc > 0 )
 125         RtspClientDel( rtsp, rtsp->sessionv[0] );
 126
 127     if( rtsp->url )
 128         httpd_UrlDelete( rtsp->url );
 129
 130     if( rtsp->host )
 131         httpd_HostDelete( rtsp->host );
 132
 133     vlc_mutex_destroy( &rtsp->lock );
 134 }
 135
 136
 137 struct rtsp_stream_id_t
 138 {
 139     rtsp_stream_t    *stream;
 140     sout_stream_id_t *sout_id;
 141     httpd_url_t      *url;
 142     const char       *dst;
 143     int               ttl;
 144     unsigned          loport, hiport;
 145 };
 146
 147
 148 typedef struct rtsp_strack_t rtsp_strack_t;
 149
 150 /* For unicast streaming */
 151 struct rtsp_session_t
 152 {
 153     rtsp_stream_t *stream;
 154     uint64_t       id;
 155
 156     /* output (id-access) */
 157     int            trackc;
 158     rtsp_strack_t *trackv;
 159 };
 160
 161
 162 /* Unicast session track */
 163 struct rtsp_strack_t
 164 {
 165     sout_stream_id_t  *id;
 166     sout_access_out_t *access;
 167     vlc_bool_t         playing;
 168 };
 169
 170
 171 rtsp_stream_id_t *RtspAddId( rtsp_stream_t *rtsp, sout_stream_id_t *sid,
 172                              unsigned num,
 173                              /* Multicast stuff - TODO: cleanup */
 174                              const char *dst, int ttl,
 175                              unsigned loport, unsigned hiport )
 176 {
 177     char urlbuf[sizeof( "//trackID=123" ) + strlen( rtsp->psz_path )];
 178     rtsp_stream_id_t *id = malloc( sizeof( *id ) );
 179     httpd_url_t *url;
 180
 181     if( id == NULL )
 182         return NULL;
 183
 184     id->stream = rtsp;
 185     id->sout_id = sid;
 186     /* TODO: can we assume that this need not be strdup'd? */
 187     id->dst = dst;
 188     if( id->dst != NULL )
 189     {
 190         id->ttl = ttl;
 191         id->loport = loport;
 192         id->hiport = hiport;
 193     }
 194
 195     snprintf( urlbuf, sizeof( urlbuf ), "/%s/trackID=%u", rtsp->psz_path,
 196               num );
 197     msg_Dbg( rtsp->owner, "RTSP: adding %s\n", urlbuf );
 198     url = id->url = httpd_UrlNewUnique( rtsp->host, urlbuf, NULL, NULL, NULL );
 199
 200     if( url == NULL )
 201     {
 202         free( id );
 203         return NULL;
 204     }
 205
 206     httpd_UrlCatch( url, HTTPD_MSG_DESCRIBE, RtspCallbackId, (void *)id );
 207     httpd_UrlCatch( url, HTTPD_MSG_SETUP,    RtspCallbackId, (void *)id );
 208     httpd_UrlCatch( url, HTTPD_MSG_PLAY,     RtspCallbackId, (void *)id );
 209     httpd_UrlCatch( url, HTTPD_MSG_PAUSE,    RtspCallbackId, (void *)id );
 210     httpd_UrlCatch( url, HTTPD_MSG_GETPARAMETER, RtspCallbackId, (void *)id );
 211     httpd_UrlCatch( url, HTTPD_MSG_TEARDOWN, RtspCallbackId, (void *)id );
 212
 213     return id;
 214 }
 215
 216
 217 void RtspDelId( rtsp_stream_t *rtsp, rtsp_stream_id_t *id )
 218 {
 219     vlc_mutex_lock( &rtsp->lock );
 220     for( int i = 0; i < rtsp->sessionc; i++ )
 221     {
 222         rtsp_session_t *ses = rtsp->sessionv[i];
 223
 224         for( int j = 0; j < ses->trackc; j++ )
 225         {
 226             if( ses->trackv[j].id == id->sout_id )
 227             {
 228                 rtsp_strack_t *tr = ses->trackv + j;
 229                 sout_AccessOutDelete( tr->access );
 230                 REMOVE_ELEM( ses->trackv, ses->trackc, j );
 231                 /* FIXME: are we supposed to notify the client? */
 232             }
 233         }
 234     }
 235
 236     vlc_mutex_unlock( &rtsp->lock );
 237     httpd_UrlDelete( id->url );
 238     free( id );
 239 }
 240
 241
 242 /** rtsp must be locked */
 243 static
 244 rtsp_session_t *RtspClientNew( rtsp_stream_t *rtsp )
 245 {
 246     rtsp_session_t *s = malloc( sizeof( *s ) );
 247     if( s == NULL )
 248         return NULL;
 249
 250     s->stream = rtsp;
 251     s->id = rand(); /* FIXME: not enough entropy */
 252     s->trackc = 0;
 253     s->trackv = NULL;
 254
 255     TAB_APPEND( rtsp->sessionc, rtsp->sessionv, s );
 256
 257     return s;
 258 }
 259
 260
 261 /** rtsp must be locked */
 262 static
 263 rtsp_session_t *RtspClientGet( rtsp_stream_t *rtsp, const char *name )
 264 {
 265     char *end;
 266     uint64_t id;
 267     int i;
 268
 269     if( name == NULL )
 270         return NULL;
 271
 272     errno = 0;
 273     id = strtoull( name, &end, 0x10 );
 274     if( errno || *end )
 275         return NULL;
 276
 277     /* FIXME: use a hash/dictionary */
 278     for( i = 0; i < rtsp->sessionc; i++ )
 279     {
 280         if( rtsp->sessionv[i]->id == id )
 281             return rtsp->sessionv[i];
 282     }
 283     return NULL;
 284 }
 285
 286
 287 /** rtsp must be locked */
 288 static
 289 void RtspClientDel( rtsp_stream_t *rtsp, rtsp_session_t *session )
 290 {
 291     int i;
 292     TAB_REMOVE( rtsp->sessionc, rtsp->sessionv, session );
 293
 294     for( i = 0; i < session->trackc; i++ )
 295     {
 296         rtp_del_sink( session->trackv[i].id, session->trackv[i].access );
 297         sout_AccessOutDelete( session->trackv[i].access );
 298     }
 299
 300     free( session->trackv );
 301     free( session );
 302 }
 303
 304
 305 /** Aggregate RTSP callback */
 306 static int RtspCallback( httpd_callback_sys_t *p_args,
 307                          httpd_client_t *cl,
 308                          httpd_message_t *answer,
 309                          const httpd_message_t *query )
 310 {
 311     rtsp_stream_t *rtsp = (rtsp_stream_t *)p_args;
 312     const char *psz_session = NULL, *psz;
 313
 314     if( answer == NULL || query == NULL )
 315     {
 316         return VLC_SUCCESS;
 317     }
 318
 319     answer->i_proto = HTTPD_PROTO_RTSP;
 320     answer->i_version= query->i_version;
 321     answer->i_type   = HTTPD_MSG_ANSWER;
 322     answer->i_body = 0;
 323     answer->p_body = NULL;
 324
 325     if( httpd_MsgGet( query, "Require" ) != NULL )
 326     {
 327         answer->i_status = 551;
 328         httpd_MsgAdd( answer, "Unsupported", "%s",
 329                       httpd_MsgGet( query, "Require" ) );
 330     }
 331     else
 332     switch( query->i_type )
 333     {
 334         case HTTPD_MSG_DESCRIBE:
 335         {
 336             char ip[NI_MAXNUMERICHOST], *ptr;
 337             char control[sizeof("rtsp://[]:12345/") + sizeof( ip )
 338                             + strlen( rtsp->psz_path )];
 339
 340             /* Build self-referential URL */
 341             httpd_ServerIP( cl, ip );
 342             ptr = strchr( ip, '%' );
 343             if( ptr != NULL )
 344                 *ptr = '\0';
 345
 346             if( strchr( ip, ':' ) != NULL )
 347                 sprintf( control, "rtsp://[%s]:%u/%s", ip, rtsp->port,
 348                          ( rtsp->psz_path != NULL ) ? rtsp->psz_path : "" );
 349             else
 350                 sprintf( control, "rtsp://%s:%u/%s", ip, rtsp->port,
 351                          ( rtsp->psz_path != NULL ) ? rtsp->psz_path : "" );
 352
 353             ptr = SDPGenerate( rtsp->owner, control );
 354
 355             answer->i_status = 200;
 356             httpd_MsgAdd( answer, "Content-Type",  "%s", "application/sdp" );
 357             httpd_MsgAdd( answer, "Content-Base",  "%s", control );
 358             answer->p_body = (uint8_t *)ptr;
 359             answer->i_body = strlen( ptr );
 360             break;
 361         }
 362
 363         case HTTPD_MSG_SETUP:
 364             answer->i_status = 459;
 365             break;
 366
 367         case HTTPD_MSG_PLAY:
 368         {
 369             rtsp_session_t *ses;
 370             answer->i_status = 200;
 371
 372             psz_session = httpd_MsgGet( query, "Session" );
 373             if( httpd_MsgGet( query, "Range" ) != NULL )
 374             {
 375                 answer->i_status = 456; /* cannot seek */
 376                 break;
 377             }
 378
 379             vlc_mutex_lock( &rtsp->lock );
 380             ses = RtspClientGet( rtsp, psz_session );
 381             if( ses != NULL )
 382             {
 383                 for( int i = 0; i < ses->trackc; i++ )
 384                 {
 385                     rtsp_strack_t *tr = ses->trackv + i;
 386                     if( !tr->playing )
 387                     {
 388                         tr->playing = VLC_TRUE;
 389                         rtp_add_sink( tr->id, tr->access );
 390                     }
 391                 }
 392             }
 393             vlc_mutex_unlock( &rtsp->lock );
 394
 395             if( httpd_MsgGet( query, "Scale" ) != NULL )
 396                 httpd_MsgAdd( answer, "Scale", "1." );
 397             break;
 398         }
 399
 400         case HTTPD_MSG_PAUSE:
 401             answer->i_status = 405;
 402             httpd_MsgAdd( answer, "Allow",
 403                           "DESCRIBE, TEARDOWN, PLAY, GET_PARAMETER" );
 404             break;
 405
 406         case HTTPD_MSG_GETPARAMETER:
 407             if( query->i_body > 0 )
 408             {
 409                 answer->i_status = 451;
 410                 break;
 411             }
 412
 413             answer->i_status = 200;
 414             break;
 415
 416         case HTTPD_MSG_TEARDOWN:
 417         {
 418             rtsp_session_t *ses;
 419
 420             /* for now only multicast so easy again */
 421             answer->i_status = 200;
 422
 423             psz_session = httpd_MsgGet( query, "Session" );
 424
 425             vlc_mutex_lock( &rtsp->lock );
 426             ses = RtspClientGet( rtsp, psz_session );
 427             if( ses != NULL )
 428                 RtspClientDel( rtsp, ses );
 429             vlc_mutex_unlock( &rtsp->lock );
 430             break;
 431         }
 432
 433         default:
 434             return VLC_EGENERIC;
 435     }
 436
 437     httpd_MsgAdd( answer, "Server", "%s", PACKAGE_STRING );
 438     httpd_MsgAdd( answer, "Content-Length", "%d", answer->i_body );
 439
 440     psz = httpd_MsgGet( query, "Cseq" );
 441     if( psz != NULL )
 442         httpd_MsgAdd( answer, "Cseq", "%s", psz );
 443     psz = httpd_MsgGet( query, "Timestamp" );
 444     if( psz != NULL )
 445         httpd_MsgAdd( answer, "Timestamp", "%s", psz );
 446
 447     httpd_MsgAdd( answer, "Cache-Control", "%s", "no-cache" );
 448
 449     if( psz_session )
 450         httpd_MsgAdd( answer, "Session", "%s;timeout=5", psz_session );
 451     return VLC_SUCCESS;
 452 }
 453
 454
 455 /** Finds the next transport choice */
 456 static inline const char *transport_next( const char *str )
 457 {
 458     /* Looks for comma */
 459     str = strchr( str, ',' );
 460     if( str == NULL )
 461         return NULL; /* No more transport options */
 462
 463     str++; /* skips comma */
 464     while( strchr( "\r\n\t ", *str ) )
 465         str++;
 466
 467     return (*str) ? str : NULL;
 468 }
 469
 470
 471 /** Finds the next transport parameter */
 472 static inline const char *parameter_next( const char *str )
 473 {
 474     while( strchr( ",;", *str ) == NULL )
 475         str++;
 476
 477     return (*str == ';') ? (str + 1) : NULL;
 478 }
 479
 480
 481 /** Non-aggregate RTSP callback */
 482 static int RtspCallbackId( httpd_callback_sys_t *p_args,
 483                            httpd_client_t *cl,
 484                            httpd_message_t *answer,
 485                            const httpd_message_t *query )
 486 {
 487     rtsp_stream_id_t *id = (rtsp_stream_id_t *)p_args;
 488     rtsp_stream_t    *rtsp = id->stream;
 489     sout_stream_t    *p_stream = id->stream->owner;
 490     char psz_sesbuf[17];
 491     const char *psz_session, *psz;
 492
 493     if( answer == NULL || query == NULL )
 494         return VLC_SUCCESS;
 495
 496     /* */
 497     answer->i_proto = HTTPD_PROTO_RTSP;
 498     answer->i_version= query->i_version;
 499     answer->i_type   = HTTPD_MSG_ANSWER;
 500     answer->i_body = 0;
 501     answer->p_body = NULL;
 502
 503     psz_session = httpd_MsgGet( query, "Session" );
 504
 505     if( httpd_MsgGet( query, "Require" ) != NULL )
 506     {
 507         answer->i_status = 551;
 508         httpd_MsgAdd( answer, "Unsupported", "%s",
 509                       httpd_MsgGet( query, "Require" ) );
 510     }
 511     else
 512     switch( query->i_type )
 513     {
 514         case HTTPD_MSG_SETUP:
 515         {
 516             answer->i_status = 461;
 517
 518             for( const char *tpt = httpd_MsgGet( query, "Transport" );
 519                  tpt != NULL;
 520                  tpt = transport_next( tpt ) )
 521             {
 522                 vlc_bool_t b_multicast = VLC_TRUE, b_unsupp = VLC_FALSE;
 523                 unsigned loport = 5004, hiport = 5005; /* from RFC3551 */
 524
 525                 /* Check transport protocol. */
 526                 /* Currently, we only support RTP/AVP over UDP */
 527                 if( strncmp( tpt, "RTP/AVP", 7 ) )
 528                     continue;
 529                 tpt += 7;
 530                 if( strncmp( tpt, "/UDP", 4 ) == 0 )
 531                     tpt += 4;
 532                 if( strchr( ";,", *tpt ) == NULL )
 533                     continue;
 534
 535                 /* Parse transport options */
 536                 for( const char *opt = parameter_next( tpt );
 537                      opt != NULL;
 538                      opt = parameter_next( opt ) )
 539                 {
 540                     if( strncmp( opt, "multicast", 9 ) == 0)
 541                         b_multicast = VLC_TRUE;
 542                     else
 543                     if( strncmp( opt, "unicast", 7 ) == 0 )
 544                         b_multicast = VLC_FALSE;
 545                     else
 546                     if( sscanf( opt, "client_port=%u-%u", &loport, &hiport ) == 2 )
 547                         ;
 548                     else
 549                     if( strncmp( opt, "mode=", 5 ) == 0 )
 550                     {
 551                         if( strncasecmp( opt + 5, "play", 4 )
 552                          && strncasecmp( opt + 5, "\"PLAY\"", 6 ) )
 553                         {
 554                             /* Not playing?! */
 555                             b_unsupp = VLC_TRUE;
 556                             break;
 557                         }
 558                     }
 559                     else
 560                     if( strncmp( opt,"destination=", 12 ) == 0 )
 561                     {
 562                         answer->i_status = 403;
 563                         b_unsupp = VLC_TRUE;
 564                     }
 565                     else
 566                     {
 567                     /*
 568                      * Every other option is unsupported:
 569                      *
 570                      * "source" and "append" are invalid (server-only);
 571                      * "ssrc" also (as clarified per RFC2326bis).
 572                      *
 573                      * For multicast, "port", "layers", "ttl" are set by the
 574                      * stream output configuration.
 575                      *
 576                      * For unicast, we want to decide "server_port" values.
 577                      *
 578                      * "interleaved" is not implemented.
 579                      */
 580                         b_unsupp = VLC_TRUE;
 581                         break;
 582                     }
 583                 }
 584
 585                 if( b_unsupp )
 586                     continue;
 587
 588                 if( b_multicast )
 589                 {
 590                     const char *dst = id->dst;
 591                     if( dst == NULL )
 592                         continue;
 593
 594                     answer->i_status = 200;
 595
 596                     httpd_MsgAdd( answer, "Transport",
 597                                   "RTP/AVP/UDP;destination=%s;port=%u-%u;"
 598                                   "ttl=%d;mode=play",
 599                                   dst, id->loport, id->hiport,
 600                                   ( id->ttl > 0 ) ? id->ttl : 1 );
 601                 }
 602                 else
 603                 {
 604                     char ip[NI_MAXNUMERICHOST], url[NI_MAXNUMERICHOST + 8];
 605                     static const char access[] = "udp{raw,rtcp}";
 606                     rtsp_session_t *ses = NULL;
 607                     rtsp_strack_t track = { id->sout_id, NULL, VLC_FALSE };
 608
 609                     if( httpd_ClientIP( cl, ip ) == NULL )
 610                     {
 611                         answer->i_status = 500;
 612                         continue;
 613                     }
 614
 615                     snprintf( url, sizeof( url ),
 616                               ( strchr( ip, ':' ) != NULL ) ? "[%s]:%d" : "%s:%d",
 617                               ip, loport );
 618
 619                     track.access = sout_AccessOutNew( p_stream->p_sout,
 620                                                       access, url );
 621                     if( track.access == NULL )
 622                     {
 623                         msg_Err( p_stream,
 624                                  "cannot create access output for %s://%s",
 625                                  access, url );
 626                         answer->i_status = 500;
 627                         continue;
 628                     }
 629
 630                     char *src = var_GetNonEmptyString( track.access, "src-addr" );
 631                     int sport = var_GetInteger( track.access, "src-port" );
 632
 633                     vlc_mutex_lock( &rtsp->lock );
 634                     if( psz_session == NULL )
 635                     {
 636                         ses = RtspClientNew( rtsp );
 637                         snprintf( psz_sesbuf, sizeof( psz_sesbuf ), I64Fx,
 638                                   ses->id );
 639                         psz_session = psz_sesbuf;
 640                     }
 641                     else
 642                     {
 643                         /* FIXME: we probably need to remove an access out,
 644                          * if there is already one for the same ID */
 645                         ses = RtspClientGet( rtsp, psz_session );
 646                         if( ses == NULL )
 647                         {
 648                             answer->i_status = 454;
 649                             vlc_mutex_unlock( &rtsp->lock );
 650                             continue;
 651                         }
 652                     }
 653
 654                     INSERT_ELEM( ses->trackv, ses->trackc, ses->trackc, track );
 655                     vlc_mutex_unlock( &rtsp->lock );
 656
 657                     httpd_ServerIP( cl, ip );
 658
 659                     if( ( src != NULL ) && strcmp( src, ip ) )
 660                     {
 661                         /* Specify source IP if it is different from the RTSP
 662                          * control connection server address */
 663                         char *ptr = strchr( src, '%' );
 664                         if( ptr != NULL ) *ptr = '\0'; /* remove scope ID */
 665
 666                         httpd_MsgAdd( answer, "Transport",
 667                                       "RTP/AVP/UDP;unicast;source=%s;"
 668                                       "client_port=%u-%u;server_port=%u-%u;"
 669                                       "mode=play",
 670                                       src, loport, loport + 1, sport, sport + 1 );
 671                     }
 672                     else
 673                     {
 674                         httpd_MsgAdd( answer, "Transport",
 675                                       "RTP/AVP/UDP;unicast;"
 676                                       "client_port=%u-%u;server_port=%u-%u;"
 677                                       "mode=play",
 678                                       loport, loport + 1, sport, sport + 1 );
 679                     }
 680
 681                     answer->i_status = 200;
 682                     free( src );
 683                 }
 684                 break;
 685             }
 686             break;
 687         }
 688
 689         case HTTPD_MSG_PLAY:
 690         {
 691             rtsp_session_t *ses;
 692             answer->i_status = 200;
 693
 694             psz_session = httpd_MsgGet( query, "Session" );
 695             if( httpd_MsgGet( query, "Range" ) != NULL )
 696             {
 697                 answer->i_status = 456; /* cannot seek */
 698                 break;
 699             }
 700
 701             vlc_mutex_lock( &rtsp->lock );
 702             ses = RtspClientGet( rtsp, psz_session );
 703             if( ses != NULL )
 704             {
 705                 for( int i = 0; i < ses->trackc; i++ )
 706                 {
 707                     rtsp_strack_t *tr = ses->trackv + i;
 708                     if( !tr->playing && ( tr->id == id->sout_id ) )
 709                     {
 710                         tr->playing = VLC_TRUE;
 711                         rtp_add_sink( tr->id, tr->access );
 712                     }
 713                 }
 714             }
 715             vlc_mutex_unlock( &rtsp->lock );
 716
 717             if( httpd_MsgGet( query, "Scale" ) != NULL )
 718                 httpd_MsgAdd( answer, "Scale", "1." );
 719             break;
 720         }
 721
 722         case HTTPD_MSG_PAUSE:
 723             answer->i_status = 405;
 724             httpd_MsgAdd( answer, "Allow",
 725                           "SETUP, TEARDOWN, PLAY, GET_PARAMETER" );
 726             break;
 727
 728         case HTTPD_MSG_GETPARAMETER:
 729             if( query->i_body > 0 )
 730             {
 731                 answer->i_status = 451;
 732                 break;
 733             }
 734
 735             answer->i_status = 200;
 736             break;
 737
 738         case HTTPD_MSG_TEARDOWN:
 739         {
 740             rtsp_session_t *ses;
 741
 742             answer->i_status = 200;
 743
 744             psz_session = httpd_MsgGet( query, "Session" );
 745
 746             vlc_mutex_lock( &rtsp->lock );
 747             ses = RtspClientGet( rtsp, psz_session );
 748             if( ses != NULL )
 749             {
 750                 for( int i = 0; i < ses->trackc; i++ )
 751                 {
 752                     if( ses->trackv[i].id == id->sout_id )
 753                     {
 754                         rtp_del_sink( id->sout_id, ses->trackv[i].access );
 755                         sout_AccessOutDelete( ses->trackv[i].access );
 756                         REMOVE_ELEM( ses->trackv, ses->trackc, i );
 757                     }
 758                 }
 759             }
 760             vlc_mutex_unlock( &rtsp->lock );
 761             break;
 762         }
 763
 764         default:
 765             answer->i_status = 460;
 766             break;
 767     }
 768
 769     psz = httpd_MsgGet( query, "Cseq" );
 770     if( psz != NULL )
 771         httpd_MsgAdd( answer, "Cseq", "%s", psz );
 772     psz = httpd_MsgGet( query, "Timestamp" );
 773     if( psz != NULL )
 774         httpd_MsgAdd( answer, "Timestamp", "%s", psz );
 775     httpd_MsgAdd( answer, "Server", "%s", PACKAGE_STRING );
 776     httpd_MsgAdd( answer, "Content-Length", "%d", answer->i_body );
 777     httpd_MsgAdd( answer, "Cache-Control", "%s", "no-cache" );
 778
 779     if( psz_session )
 780         httpd_MsgAdd( answer, "Session", "%s"/*;timeout=5*/, psz_session );
 781     return VLC_SUCCESS;
 782 }