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 <vlc_rand.h>
  36 #include <assert.h>
  37 #include <errno.h>
  38 #include <stdlib.h>
  39
  40 #include "rtp.h"
  41
  42 typedef struct rtsp_session_t rtsp_session_t;
  43
  44 struct rtsp_stream_t
  45 {
  46     vlc_mutex_t     lock;
  47     sout_stream_t  *owner;
  48     httpd_host_t   *host;
  49     httpd_url_t    *url;
  50     char           *psz_path;
  51     unsigned        port;
  52
  53     int             sessionc;
  54     rtsp_session_t **sessionv;
  55 };
  56
  57
  58 static int  RtspCallback( httpd_callback_sys_t *p_args,
  59                           httpd_client_t *cl, httpd_message_t *answer,
  60                           const httpd_message_t *query );
  61 static int  RtspCallbackId( httpd_callback_sys_t *p_args,
  62                             httpd_client_t *cl, httpd_message_t *answer,
  63                             const httpd_message_t *query );
  64 static void RtspClientDel( rtsp_stream_t *rtsp, rtsp_session_t *session );
  65
  66 rtsp_stream_t *RtspSetup( sout_stream_t *p_stream, const vlc_url_t *url )
  67 {
  68     rtsp_stream_t *rtsp = malloc( sizeof( *rtsp ) );
  69
  70     if( rtsp == NULL || ( url->i_port > 99999 ) )
  71         return NULL;
  72
  73     rtsp->owner = p_stream;
  74     rtsp->sessionc = 0;
  75     rtsp->sessionv = NULL;
  76     vlc_mutex_init( p_stream, &rtsp->lock );
  77
  78     msg_Dbg( p_stream, "rtsp setup: %s : %d / %s\n",
  79              url->psz_host, url->i_port, url->psz_path );
  80
  81     rtsp->port = (url->i_port > 0) ? url->i_port : 554;
  82     if( url->psz_path != NULL )
  83         rtsp->psz_path = strdup( url->psz_path + 1 );
  84     else
  85         rtsp->psz_path = NULL;
  86
  87 #if 0
  88     if( asprintf( &rtsp->psz_control, "rtsp://%s:%d%s",
  89                   url->psz_host,  url->i_port > 0 ? url->i_port : 554,
  90                   rtsp->psz_path ) == -1 )
  91     {
  92         rtsp->psz_control = NULL;
  93         goto error;
  94     }
  95 #endif
  96
  97     rtsp->host = httpd_HostNew( VLC_OBJECT(p_stream), url->psz_host,
  98                                 rtsp->port );
  99     if( rtsp->host == NULL )
 100         goto error;
 101
 102     rtsp->url = httpd_UrlNewUnique( rtsp->host,
 103                                     url->psz_path ? url->psz_path : "/", NULL,
 104                                     NULL, NULL );
 105     if( rtsp->url == NULL )
 106         goto error;
 107
 108     httpd_UrlCatch( rtsp->url, HTTPD_MSG_DESCRIBE, RtspCallback, (void*)rtsp );
 109     httpd_UrlCatch( rtsp->url, HTTPD_MSG_SETUP,    RtspCallback, (void*)rtsp );
 110     httpd_UrlCatch( rtsp->url, HTTPD_MSG_PLAY,     RtspCallback, (void*)rtsp );
 111     httpd_UrlCatch( rtsp->url, HTTPD_MSG_PAUSE,    RtspCallback, (void*)rtsp );
 112     httpd_UrlCatch( rtsp->url, HTTPD_MSG_GETPARAMETER, RtspCallback,
 113                     (void*)rtsp );
 114     httpd_UrlCatch( rtsp->url, HTTPD_MSG_TEARDOWN, RtspCallback, (void*)rtsp );
 115     return rtsp;
 116
 117 error:
 118     RtspUnsetup( rtsp );
 119     return NULL;
 120 }
 121
 122
 123 void RtspUnsetup( rtsp_stream_t *rtsp )
 124 {
 125     while( rtsp->sessionc > 0 )
 126         RtspClientDel( rtsp, rtsp->sessionv[0] );
 127
 128     if( rtsp->url )
 129         httpd_UrlDelete( rtsp->url );
 130
 131     if( rtsp->host )
 132         httpd_HostDelete( rtsp->host );
 133
 134     vlc_mutex_destroy( &rtsp->lock );
 135 }
 136
 137
 138 struct rtsp_stream_id_t
 139 {
 140     rtsp_stream_t    *stream;
 141     sout_stream_id_t *sout_id;
 142     httpd_url_t      *url;
 143     const char       *dst;
 144     int               ttl;
 145     unsigned          loport, hiport;
 146 };
 147
 148
 149 typedef struct rtsp_strack_t rtsp_strack_t;
 150
 151 /* For unicast streaming */
 152 struct rtsp_session_t
 153 {
 154     rtsp_stream_t *stream;
 155     uint64_t       id;
 156
 157     /* output (id-access) */
 158     int            trackc;
 159     rtsp_strack_t *trackv;
 160 };
 161
 162
 163 /* Unicast session track */
 164 struct rtsp_strack_t
 165 {
 166     sout_stream_id_t  *id;
 167     sout_access_out_t *access;
 168     vlc_bool_t         playing;
 169 };
 170
 171
 172 rtsp_stream_id_t *RtspAddId( rtsp_stream_t *rtsp, sout_stream_id_t *sid,
 173                              unsigned num,
 174                              /* Multicast stuff - TODO: cleanup */
 175                              const char *dst, int ttl,
 176                              unsigned loport, unsigned hiport )
 177 {
 178     char urlbuf[sizeof( "//trackID=123" ) + strlen( rtsp->psz_path )];
 179     rtsp_stream_id_t *id = malloc( sizeof( *id ) );
 180     httpd_url_t *url;
 181
 182     if( id == NULL )
 183         return NULL;
 184
 185     id->stream = rtsp;
 186     id->sout_id = sid;
 187     /* TODO: can we assume that this need not be strdup'd? */
 188     id->dst = dst;
 189     if( id->dst != NULL )
 190     {
 191         id->ttl = ttl;
 192         id->loport = loport;
 193         id->hiport = hiport;
 194     }
 195
 196     snprintf( urlbuf, sizeof( urlbuf ), "/%s/trackID=%u", rtsp->psz_path,
 197               num );
 198     msg_Dbg( rtsp->owner, "RTSP: adding %s\n", urlbuf );
 199     url = id->url = httpd_UrlNewUnique( rtsp->host, urlbuf, NULL, NULL, NULL );
 200
 201     if( url == NULL )
 202     {
 203         free( id );
 204         return NULL;
 205     }
 206
 207     httpd_UrlCatch( url, HTTPD_MSG_DESCRIBE, RtspCallbackId, (void *)id );
 208     httpd_UrlCatch( url, HTTPD_MSG_SETUP,    RtspCallbackId, (void *)id );
 209     httpd_UrlCatch( url, HTTPD_MSG_PLAY,     RtspCallbackId, (void *)id );
 210     httpd_UrlCatch( url, HTTPD_MSG_PAUSE,    RtspCallbackId, (void *)id );
 211     httpd_UrlCatch( url, HTTPD_MSG_GETPARAMETER, RtspCallbackId, (void *)id );
 212     httpd_UrlCatch( url, HTTPD_MSG_TEARDOWN, RtspCallbackId, (void *)id );
 213
 214     return id;
 215 }
 216
 217
 218 void RtspDelId( rtsp_stream_t *rtsp, rtsp_stream_id_t *id )
 219 {
 220     vlc_mutex_lock( &rtsp->lock );
 221     for( int i = 0; i < rtsp->sessionc; i++ )
 222     {
 223         rtsp_session_t *ses = rtsp->sessionv[i];
 224
 225         for( int j = 0; j < ses->trackc; j++ )
 226         {
 227             if( ses->trackv[j].id == id->sout_id )
 228             {
 229                 rtsp_strack_t *tr = ses->trackv + j;
 230                 sout_AccessOutDelete( tr->access );
 231                 REMOVE_ELEM( ses->trackv, ses->trackc, j );
 232                 /* FIXME: are we supposed to notify the client? */
 233             }
 234         }
 235     }
 236
 237     vlc_mutex_unlock( &rtsp->lock );
 238     httpd_UrlDelete( id->url );
 239     free( id );
 240 }
 241
 242
 243 /** rtsp must be locked */
 244 static
 245 rtsp_session_t *RtspClientNew( rtsp_stream_t *rtsp )
 246 {
 247     rtsp_session_t *s = malloc( sizeof( *s ) );
 248     if( s == NULL )
 249         return NULL;
 250
 251     s->stream = rtsp;
 252     vlc_rand_bytes (&s->id, sizeof (s->id));
 253     s->trackc = 0;
 254     s->trackv = NULL;
 255
 256     TAB_APPEND( rtsp->sessionc, rtsp->sessionv, s );
 257
 258     return s;
 259 }
 260
 261
 262 /** rtsp must be locked */
 263 static
 264 rtsp_session_t *RtspClientGet( rtsp_stream_t *rtsp, const char *name )
 265 {
 266     char *end;
 267     uint64_t id;
 268     int i;
 269
 270     if( name == NULL )
 271         return NULL;
 272
 273     errno = 0;
 274     id = strtoull( name, &end, 0x10 );
 275     if( errno || *end )
 276         return NULL;
 277
 278     /* FIXME: use a hash/dictionary */
 279     for( i = 0; i < rtsp->sessionc; i++ )
 280     {
 281         if( rtsp->sessionv[i]->id == id )
 282             return rtsp->sessionv[i];
 283     }
 284     return NULL;
 285 }
 286
 287
 288 /** rtsp must be locked */
 289 static
 290 void RtspClientDel( rtsp_stream_t *rtsp, rtsp_session_t *session )
 291 {
 292     int i;
 293     TAB_REMOVE( rtsp->sessionc, rtsp->sessionv, session );
 294
 295     for( i = 0; i < session->trackc; i++ )
 296     {
 297         rtp_del_sink( session->trackv[i].id, session->trackv[i].access );
 298         sout_AccessOutDelete( session->trackv[i].access );
 299     }
 300
 301     free( session->trackv );
 302     free( session );
 303 }
 304
 305
 306 /** Aggregate RTSP callback */
 307 static int RtspCallback( httpd_callback_sys_t *p_args,
 308                          httpd_client_t *cl,
 309                          httpd_message_t *answer,
 310                          const httpd_message_t *query )
 311 {
 312     rtsp_stream_t *rtsp = (rtsp_stream_t *)p_args;
 313     const char *psz_session = NULL, *psz;
 314
 315     if( answer == NULL || query == NULL )
 316     {
 317         return VLC_SUCCESS;
 318     }
 319
 320     answer->i_proto = HTTPD_PROTO_RTSP;
 321     answer->i_version= query->i_version;
 322     answer->i_type   = HTTPD_MSG_ANSWER;
 323     answer->i_body = 0;
 324     answer->p_body = NULL;
 325
 326     if( httpd_MsgGet( query, "Require" ) != NULL )
 327     {
 328         answer->i_status = 551;
 329         httpd_MsgAdd( answer, "Unsupported", "%s",
 330                       httpd_MsgGet( query, "Require" ) );
 331     }
 332     else
 333     switch( query->i_type )
 334     {
 335         case HTTPD_MSG_DESCRIBE:
 336         {
 337             char ip[NI_MAXNUMERICHOST], *ptr;
 338             char control[sizeof("rtsp://[]:12345/") + sizeof( ip )
 339                             + strlen( rtsp->psz_path )];
 340
 341             /* Build self-referential URL */
 342             httpd_ServerIP( cl, ip );
 343             ptr = strchr( ip, '%' );
 344             if( ptr != NULL )
 345                 *ptr = '\0';
 346
 347             if( strchr( ip, ':' ) != NULL )
 348                 sprintf( control, "rtsp://[%s]:%u/%s", ip, rtsp->port,
 349                          ( rtsp->psz_path != NULL ) ? rtsp->psz_path : "" );
 350             else
 351                 sprintf( control, "rtsp://%s:%u/%s", ip, rtsp->port,
 352                          ( rtsp->psz_path != NULL ) ? rtsp->psz_path : "" );
 353
 354             ptr = SDPGenerate( rtsp->owner, control );
 355
 356             answer->i_status = 200;
 357             httpd_MsgAdd( answer, "Content-Type",  "%s", "application/sdp" );
 358             httpd_MsgAdd( answer, "Content-Base",  "%s", control );
 359             answer->p_body = (uint8_t *)ptr;
 360             answer->i_body = strlen( ptr );
 361             break;
 362         }
 363
 364         case HTTPD_MSG_SETUP:
 365             answer->i_status = 459;
 366             break;
 367
 368         case HTTPD_MSG_PLAY:
 369         {
 370             rtsp_session_t *ses;
 371             answer->i_status = 200;
 372
 373             psz_session = httpd_MsgGet( query, "Session" );
 374             if( httpd_MsgGet( query, "Range" ) != NULL )
 375             {
 376                 answer->i_status = 456; /* cannot seek */
 377                 break;
 378             }
 379
 380             vlc_mutex_lock( &rtsp->lock );
 381             ses = RtspClientGet( rtsp, psz_session );
 382             if( ses != NULL )
 383             {
 384                 for( int i = 0; i < ses->trackc; i++ )
 385                 {
 386                     rtsp_strack_t *tr = ses->trackv + i;
 387                     if( !tr->playing )
 388                     {
 389                         tr->playing = VLC_TRUE;
 390                         rtp_add_sink( tr->id, tr->access );
 391                     }
 392                 }
 393             }
 394             vlc_mutex_unlock( &rtsp->lock );
 395
 396             if( httpd_MsgGet( query, "Scale" ) != NULL )
 397                 httpd_MsgAdd( answer, "Scale", "1." );
 398             break;
 399         }
 400
 401         case HTTPD_MSG_PAUSE:
 402             answer->i_status = 405;
 403             httpd_MsgAdd( answer, "Allow",
 404                           "DESCRIBE, TEARDOWN, PLAY, GET_PARAMETER" );
 405             break;
 406
 407         case HTTPD_MSG_GETPARAMETER:
 408             if( query->i_body > 0 )
 409             {
 410                 answer->i_status = 451;
 411                 break;
 412             }
 413
 414             answer->i_status = 200;
 415             break;
 416
 417         case HTTPD_MSG_TEARDOWN:
 418         {
 419             rtsp_session_t *ses;
 420
 421             /* for now only multicast so easy again */
 422             answer->i_status = 200;
 423
 424             psz_session = httpd_MsgGet( query, "Session" );
 425
 426             vlc_mutex_lock( &rtsp->lock );
 427             ses = RtspClientGet( rtsp, psz_session );
 428             if( ses != NULL )
 429                 RtspClientDel( rtsp, ses );
 430             vlc_mutex_unlock( &rtsp->lock );
 431             break;
 432         }
 433
 434         default:
 435             return VLC_EGENERIC;
 436     }
 437
 438     httpd_MsgAdd( answer, "Server", "%s", PACKAGE_STRING );
 439     httpd_MsgAdd( answer, "Content-Length", "%d", answer->i_body );
 440
 441     psz = httpd_MsgGet( query, "Cseq" );
 442     if( psz != NULL )
 443         httpd_MsgAdd( answer, "Cseq", "%s", psz );
 444     psz = httpd_MsgGet( query, "Timestamp" );
 445     if( psz != NULL )
 446         httpd_MsgAdd( answer, "Timestamp", "%s", psz );
 447
 448     httpd_MsgAdd( answer, "Cache-Control", "%s", "no-cache" );
 449
 450     if( psz_session )
 451         httpd_MsgAdd( answer, "Session", "%s;timeout=5", psz_session );
 452     return VLC_SUCCESS;
 453 }
 454
 455
 456 /** Finds the next transport choice */
 457 static inline const char *transport_next( const char *str )
 458 {
 459     /* Looks for comma */
 460     str = strchr( str, ',' );
 461     if( str == NULL )
 462         return NULL; /* No more transport options */
 463
 464     str++; /* skips comma */
 465     while( strchr( "\r\n\t ", *str ) )
 466         str++;
 467
 468     return (*str) ? str : NULL;
 469 }
 470
 471
 472 /** Finds the next transport parameter */
 473 static inline const char *parameter_next( const char *str )
 474 {
 475     while( strchr( ",;", *str ) == NULL )
 476         str++;
 477
 478     return (*str == ';') ? (str + 1) : NULL;
 479 }
 480
 481
 482 /** Non-aggregate RTSP callback */
 483 static int RtspCallbackId( httpd_callback_sys_t *p_args,
 484                            httpd_client_t *cl,
 485                            httpd_message_t *answer,
 486                            const httpd_message_t *query )
 487 {
 488     rtsp_stream_id_t *id = (rtsp_stream_id_t *)p_args;
 489     rtsp_stream_t    *rtsp = id->stream;
 490     sout_stream_t    *p_stream = id->stream->owner;
 491     char psz_sesbuf[17];
 492     const char *psz_session, *psz;
 493
 494     if( answer == NULL || query == NULL )
 495         return VLC_SUCCESS;
 496
 497     /* */
 498     answer->i_proto = HTTPD_PROTO_RTSP;
 499     answer->i_version= query->i_version;
 500     answer->i_type   = HTTPD_MSG_ANSWER;
 501     answer->i_body = 0;
 502     answer->p_body = NULL;
 503
 504     psz_session = httpd_MsgGet( query, "Session" );
 505
 506     if( httpd_MsgGet( query, "Require" ) != NULL )
 507     {
 508         answer->i_status = 551;
 509         httpd_MsgAdd( answer, "Unsupported", "%s",
 510                       httpd_MsgGet( query, "Require" ) );
 511     }
 512     else
 513     switch( query->i_type )
 514     {
 515         case HTTPD_MSG_SETUP:
 516         {
 517             answer->i_status = 461;
 518
 519             for( const char *tpt = httpd_MsgGet( query, "Transport" );
 520                  tpt != NULL;
 521                  tpt = transport_next( tpt ) )
 522             {
 523                 vlc_bool_t b_multicast = VLC_TRUE, b_unsupp = VLC_FALSE;
 524                 unsigned loport = 5004, hiport = 5005; /* from RFC3551 */
 525
 526                 /* Check transport protocol. */
 527                 /* Currently, we only support RTP/AVP over UDP */
 528                 if( strncmp( tpt, "RTP/AVP", 7 ) )
 529                     continue;
 530                 tpt += 7;
 531                 if( strncmp( tpt, "/UDP", 4 ) == 0 )
 532                     tpt += 4;
 533                 if( strchr( ";,", *tpt ) == NULL )
 534                     continue;
 535
 536                 /* Parse transport options */
 537                 for( const char *opt = parameter_next( tpt );
 538                      opt != NULL;
 539                      opt = parameter_next( opt ) )
 540                 {
 541                     if( strncmp( opt, "multicast", 9 ) == 0)
 542                         b_multicast = VLC_TRUE;
 543                     else
 544                     if( strncmp( opt, "unicast", 7 ) == 0 )
 545                         b_multicast = VLC_FALSE;
 546                     else
 547                     if( sscanf( opt, "client_port=%u-%u", &loport, &hiport )
 548                                 == 2 )
 549                         ;
 550                     else
 551                     if( strncmp( opt, "mode=", 5 ) == 0 )
 552                     {
 553                         if( strncasecmp( opt + 5, "play", 4 )
 554                          && strncasecmp( opt + 5, "\"PLAY\"", 6 ) )
 555                         {
 556                             /* Not playing?! */
 557                             b_unsupp = VLC_TRUE;
 558                             break;
 559                         }
 560                     }
 561                     else
 562                     if( strncmp( opt,"destination=", 12 ) == 0 )
 563                     {
 564                         answer->i_status = 403;
 565                         b_unsupp = VLC_TRUE;
 566                     }
 567                     else
 568                     {
 569                     /*
 570                      * Every other option is unsupported:
 571                      *
 572                      * "source" and "append" are invalid (server-only);
 573                      * "ssrc" also (as clarified per RFC2326bis).
 574                      *
 575                      * For multicast, "port", "layers", "ttl" are set by the
 576                      * stream output configuration.
 577                      *
 578                      * For unicast, we want to decide "server_port" values.
 579                      *
 580                      * "interleaved" is not implemented.
 581                      */
 582                         b_unsupp = VLC_TRUE;
 583                         break;
 584                     }
 585                 }
 586
 587                 if( b_unsupp )
 588                     continue;
 589
 590                 if( b_multicast )
 591                 {
 592                     const char *dst = id->dst;
 593                     if( dst == NULL )
 594                         continue;
 595
 596                     answer->i_status = 200;
 597
 598                     httpd_MsgAdd( answer, "Transport",
 599                                   "RTP/AVP/UDP;destination=%s;port=%u-%u;"
 600                                   "ttl=%d;mode=play",
 601                                   dst, id->loport, id->hiport,
 602                                   ( id->ttl > 0 ) ? id->ttl : 1 );
 603                 }
 604                 else
 605                 {
 606                     char ip[NI_MAXNUMERICHOST], url[NI_MAXNUMERICHOST + 8];
 607                     static const char access[] = "udp{raw,rtcp}";
 608                     rtsp_session_t *ses = NULL;
 609                     rtsp_strack_t track = { id->sout_id, NULL, VLC_FALSE };
 610
 611                     if( httpd_ClientIP( cl, ip ) == NULL )
 612                     {
 613                         answer->i_status = 500;
 614                         continue;
 615                     }
 616
 617                     snprintf( url, sizeof( url ),
 618                               ( strchr( ip, ':' ) != NULL )
 619                                   ? "[%s]:%d" : "%s:%d",
 620                               ip, loport );
 621
 622                     track.access = sout_AccessOutNew( p_stream->p_sout,
 623                                                       access, url );
 624                     if( track.access == NULL )
 625                     {
 626                         msg_Err( p_stream,
 627                                  "cannot create access output for %s://%s",
 628                                  access, url );
 629                         answer->i_status = 500;
 630                         continue;
 631                     }
 632
 633                     char *src = var_GetNonEmptyString( track.access,
 634                                                        "src-addr" );
 635                     int sport = var_GetInteger( track.access, "src-port" );
 636
 637                     vlc_mutex_lock( &rtsp->lock );
 638                     if( psz_session == NULL )
 639                     {
 640                         ses = RtspClientNew( rtsp );
 641                         snprintf( psz_sesbuf, sizeof( psz_sesbuf ), I64Fx,
 642                                   ses->id );
 643                         psz_session = psz_sesbuf;
 644                     }
 645                     else
 646                     {
 647                         /* FIXME: we probably need to remove an access out,
 648                          * if there is already one for the same ID */
 649                         ses = RtspClientGet( rtsp, psz_session );
 650                         if( ses == NULL )
 651                         {
 652                             answer->i_status = 454;
 653                             vlc_mutex_unlock( &rtsp->lock );
 654                             continue;
 655                         }
 656                     }
 657
 658                     INSERT_ELEM( ses->trackv, ses->trackc, ses->trackc, track );
 659                     vlc_mutex_unlock( &rtsp->lock );
 660
 661                     httpd_ServerIP( cl, ip );
 662
 663                     if( ( src != NULL ) && strcmp( src, ip ) )
 664                     {
 665                         /* Specify source IP if it is different from the RTSP
 666                          * control connection server address */
 667                         char *ptr = strchr( src, '%' );
 668                         if( ptr != NULL ) *ptr = '\0'; /* remove scope ID */
 669
 670                         httpd_MsgAdd( answer, "Transport",
 671                                       "RTP/AVP/UDP;unicast;source=%s;"
 672                                       "client_port=%u-%u;server_port=%u-%u;"
 673                                       "mode=play",
 674                                       src, loport, loport + 1, sport,
 675                                       sport + 1 );
 676                     }
 677                     else
 678                     {
 679                         httpd_MsgAdd( answer, "Transport",
 680                                       "RTP/AVP/UDP;unicast;"
 681                                       "client_port=%u-%u;server_port=%u-%u;"
 682                                       "mode=play",
 683                                       loport, loport + 1, sport, sport + 1 );
 684                     }
 685
 686                     answer->i_status = 200;
 687                     free( src );
 688                 }
 689                 break;
 690             }
 691             break;
 692         }
 693
 694         case HTTPD_MSG_PLAY:
 695         {
 696             rtsp_session_t *ses;
 697             answer->i_status = 200;
 698
 699             psz_session = httpd_MsgGet( query, "Session" );
 700             if( httpd_MsgGet( query, "Range" ) != NULL )
 701             {
 702                 answer->i_status = 456; /* cannot seek */
 703                 break;
 704             }
 705
 706             vlc_mutex_lock( &rtsp->lock );
 707             ses = RtspClientGet( rtsp, psz_session );
 708             if( ses != NULL )
 709             {
 710                 for( int i = 0; i < ses->trackc; i++ )
 711                 {
 712                     rtsp_strack_t *tr = ses->trackv + i;
 713                     if( !tr->playing && ( tr->id == id->sout_id ) )
 714                     {
 715                         tr->playing = VLC_TRUE;
 716                         rtp_add_sink( tr->id, tr->access );
 717                     }
 718                 }
 719             }
 720             vlc_mutex_unlock( &rtsp->lock );
 721
 722             if( httpd_MsgGet( query, "Scale" ) != NULL )
 723                 httpd_MsgAdd( answer, "Scale", "1." );
 724             break;
 725         }
 726
 727         case HTTPD_MSG_PAUSE:
 728             answer->i_status = 405;
 729             httpd_MsgAdd( answer, "Allow",
 730                           "SETUP, TEARDOWN, PLAY, GET_PARAMETER" );
 731             break;
 732
 733         case HTTPD_MSG_GETPARAMETER:
 734             if( query->i_body > 0 )
 735             {
 736                 answer->i_status = 451;
 737                 break;
 738             }
 739
 740             answer->i_status = 200;
 741             break;
 742
 743         case HTTPD_MSG_TEARDOWN:
 744         {
 745             rtsp_session_t *ses;
 746
 747             answer->i_status = 200;
 748
 749             psz_session = httpd_MsgGet( query, "Session" );
 750
 751             vlc_mutex_lock( &rtsp->lock );
 752             ses = RtspClientGet( rtsp, psz_session );
 753             if( ses != NULL )
 754             {
 755                 for( int i = 0; i < ses->trackc; i++ )
 756                 {
 757                     if( ses->trackv[i].id == id->sout_id )
 758                     {
 759                         rtp_del_sink( id->sout_id, ses->trackv[i].access );
 760                         sout_AccessOutDelete( ses->trackv[i].access );
 761                         REMOVE_ELEM( ses->trackv, ses->trackc, i );
 762                     }
 763                 }
 764             }
 765             vlc_mutex_unlock( &rtsp->lock );
 766             break;
 767         }
 768
 769         default:
 770             answer->i_status = 460;
 771             break;
 772     }
 773
 774     psz = httpd_MsgGet( query, "Cseq" );
 775     if( psz != NULL )
 776         httpd_MsgAdd( answer, "Cseq", "%s", psz );
 777     psz = httpd_MsgGet( query, "Timestamp" );
 778     if( psz != NULL )
 779         httpd_MsgAdd( answer, "Timestamp", "%s", psz );
 780     httpd_MsgAdd( answer, "Server", "%s", PACKAGE_STRING );
 781     httpd_MsgAdd( answer, "Content-Length", "%d", answer->i_body );
 782     httpd_MsgAdd( answer, "Cache-Control", "%s", "no-cache" );
 783
 784     if( psz_session )
 785         httpd_MsgAdd( answer, "Session", "%s"/*;timeout=5*/, psz_session );
 786     return VLC_SUCCESS;
 787 }