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 /** Finds the next transport choice */
 307 static inline const char *transport_next( const char *str )
 308 {
 309     /* Looks for comma */
 310     str = strchr( str, ',' );
 311     if( str == NULL )
 312         return NULL; /* No more transport options */
 313
 314     str++; /* skips comma */
 315     while( strchr( "\r\n\t ", *str ) )
 316         str++;
 317
 318     return (*str) ? str : NULL;
 319 }
 320
 321
 322 /** Finds the next transport parameter */
 323 static inline const char *parameter_next( const char *str )
 324 {
 325     while( strchr( ",;", *str ) == NULL )
 326         str++;
 327
 328     return (*str == ';') ? (str + 1) : NULL;
 329 }
 330
 331
 332 /** RTSP requests handler
 333  * @param id selected track for non-aggregate URLs,
 334  *           NULL for aggregate URLs
 335  */
 336 static int RtspHandler( rtsp_stream_t *rtsp, rtsp_stream_id_t *id,
 337                         httpd_client_t *cl,
 338                         httpd_message_t *answer,
 339                         const httpd_message_t *query )
 340 {
 341     sout_stream_t *p_stream = id->stream->owner;
 342     char psz_sesbuf[17];
 343     const char *psz_session = NULL, *psz;
 344
 345     if( answer == NULL || query == NULL )
 346         return VLC_SUCCESS;
 347
 348     /* */
 349     answer->i_proto = HTTPD_PROTO_RTSP;
 350     answer->i_version= query->i_version;
 351     answer->i_type   = HTTPD_MSG_ANSWER;
 352     answer->i_body = 0;
 353     answer->p_body = NULL;
 354
 355     if( httpd_MsgGet( query, "Require" ) != NULL )
 356     {
 357         answer->i_status = 551;
 358         httpd_MsgAdd( answer, "Unsupported", "%s",
 359                       httpd_MsgGet( query, "Require" ) );
 360     }
 361     else
 362     switch( query->i_type )
 363     {
 364         case HTTPD_MSG_DESCRIBE:
 365         {   /* Aggregate-only */
 366             if( id != NULL )
 367             {
 368                 answer->i_status = 460;
 369                 break;
 370             }
 371
 372             char ip[NI_MAXNUMERICHOST], *ptr;
 373             char control[sizeof("rtsp://[]:12345/") + sizeof( ip )
 374                             + strlen( rtsp->psz_path )];
 375
 376             /* Build self-referential URL */
 377             httpd_ServerIP( cl, ip );
 378             ptr = strchr( ip, '%' );
 379             if( ptr != NULL )
 380                 *ptr = '\0';
 381
 382             if( strchr( ip, ':' ) != NULL )
 383                 sprintf( control, "rtsp://[%s]:%u/%s", ip, rtsp->port,
 384                          ( rtsp->psz_path != NULL ) ? rtsp->psz_path : "" );
 385             else
 386                 sprintf( control, "rtsp://%s:%u/%s", ip, rtsp->port,
 387                          ( rtsp->psz_path != NULL ) ? rtsp->psz_path : "" );
 388
 389             ptr = SDPGenerate( rtsp->owner, control );
 390
 391             answer->i_status = 200;
 392             httpd_MsgAdd( answer, "Content-Type",  "%s", "application/sdp" );
 393             httpd_MsgAdd( answer, "Content-Base",  "%s", control );
 394             answer->p_body = (uint8_t *)ptr;
 395             answer->i_body = strlen( ptr );
 396             break;
 397         }
 398
 399         case HTTPD_MSG_SETUP:
 400             /* Non-aggregate-only */
 401             if( id == NULL )
 402             {
 403                 answer->i_status = 459;
 404                 break;
 405             }
 406
 407             psz_session = httpd_MsgGet( query, "Session" );
 408             answer->i_status = 461;
 409
 410             for( const char *tpt = httpd_MsgGet( query, "Transport" );
 411                  tpt != NULL;
 412                  tpt = transport_next( tpt ) )
 413             {
 414                 vlc_bool_t b_multicast = VLC_TRUE, b_unsupp = VLC_FALSE;
 415                 unsigned loport = 5004, hiport = 5005; /* from RFC3551 */
 416
 417                 /* Check transport protocol. */
 418                 /* Currently, we only support RTP/AVP over UDP */
 419                 if( strncmp( tpt, "RTP/AVP", 7 ) )
 420                     continue;
 421                 tpt += 7;
 422                 if( strncmp( tpt, "/UDP", 4 ) == 0 )
 423                     tpt += 4;
 424                 if( strchr( ";,", *tpt ) == NULL )
 425                     continue;
 426
 427                 /* Parse transport options */
 428                 for( const char *opt = parameter_next( tpt );
 429                      opt != NULL;
 430                      opt = parameter_next( opt ) )
 431                 {
 432                     if( strncmp( opt, "multicast", 9 ) == 0)
 433                         b_multicast = VLC_TRUE;
 434                     else
 435                     if( strncmp( opt, "unicast", 7 ) == 0 )
 436                         b_multicast = VLC_FALSE;
 437                     else
 438                     if( sscanf( opt, "client_port=%u-%u", &loport, &hiport )
 439                                 == 2 )
 440                         ;
 441                     else
 442                     if( strncmp( opt, "mode=", 5 ) == 0 )
 443                     {
 444                         if( strncasecmp( opt + 5, "play", 4 )
 445                          && strncasecmp( opt + 5, "\"PLAY\"", 6 ) )
 446                         {
 447                             /* Not playing?! */
 448                             b_unsupp = VLC_TRUE;
 449                             break;
 450                         }
 451                     }
 452                     else
 453                     if( strncmp( opt,"destination=", 12 ) == 0 )
 454                     {
 455                         answer->i_status = 403;
 456                         b_unsupp = VLC_TRUE;
 457                     }
 458                     else
 459                     {
 460                     /*
 461                      * Every other option is unsupported:
 462                      *
 463                      * "source" and "append" are invalid (server-only);
 464                      * "ssrc" also (as clarified per RFC2326bis).
 465                      *
 466                      * For multicast, "port", "layers", "ttl" are set by the
 467                      * stream output configuration.
 468                      *
 469                      * For unicast, we want to decide "server_port" values.
 470                      *
 471                      * "interleaved" is not implemented.
 472                      */
 473                         b_unsupp = VLC_TRUE;
 474                         break;
 475                     }
 476                 }
 477
 478                 if( b_unsupp )
 479                     continue;
 480
 481                 if( b_multicast )
 482                 {
 483                     const char *dst = id->dst;
 484                     if( dst == NULL )
 485                         continue;
 486
 487                     if( psz_session == NULL )
 488                     {
 489                         /* Create a dummy session ID */
 490                         snprintf( psz_sesbuf, sizeof( psz_sesbuf ), "%d",
 491                                   rand() );
 492                         psz_session = psz_sesbuf;
 493                     }
 494                     answer->i_status = 200;
 495
 496                     httpd_MsgAdd( answer, "Transport",
 497                                   "RTP/AVP/UDP;destination=%s;port=%u-%u;"
 498                                   "ttl=%d;mode=play",
 499                                   dst, id->loport, id->hiport,
 500                                   ( id->ttl > 0 ) ? id->ttl : 1 );
 501                 }
 502                 else
 503                 {
 504                     char ip[NI_MAXNUMERICHOST], url[NI_MAXNUMERICHOST + 8];
 505                     static const char access[] = "udp{raw,rtcp}";
 506                     rtsp_session_t *ses = NULL;
 507                     rtsp_strack_t track = { id->sout_id, NULL, VLC_FALSE };
 508
 509                     if( httpd_ClientIP( cl, ip ) == NULL )
 510                     {
 511                         answer->i_status = 500;
 512                         continue;
 513                     }
 514
 515                     snprintf( url, sizeof( url ),
 516                               ( strchr( ip, ':' ) != NULL )
 517                                   ? "[%s]:%d" : "%s:%d",
 518                               ip, loport );
 519
 520                     track.access = sout_AccessOutNew( p_stream->p_sout,
 521                                                       access, url );
 522                     if( track.access == NULL )
 523                     {
 524                         msg_Err( p_stream,
 525                                  "cannot create access output for %s://%s",
 526                                  access, url );
 527                         answer->i_status = 500;
 528                         continue;
 529                     }
 530
 531                     char *src = var_GetNonEmptyString( track.access,
 532                                                        "src-addr" );
 533                     int sport = var_GetInteger( track.access, "src-port" );
 534
 535                     vlc_mutex_lock( &rtsp->lock );
 536                     if( psz_session == NULL )
 537                     {
 538                         ses = RtspClientNew( rtsp );
 539                         snprintf( psz_sesbuf, sizeof( psz_sesbuf ), I64Fx,
 540                                   ses->id );
 541                         psz_session = psz_sesbuf;
 542                     }
 543                     else
 544                     {
 545                         /* FIXME: we probably need to remove an access out,
 546                          * if there is already one for the same ID */
 547                         ses = RtspClientGet( rtsp, psz_session );
 548                         if( ses == NULL )
 549                         {
 550                             answer->i_status = 454;
 551                             vlc_mutex_unlock( &rtsp->lock );
 552                             continue;
 553                         }
 554                     }
 555
 556                     INSERT_ELEM( ses->trackv, ses->trackc, ses->trackc,
 557                                  track );
 558                     vlc_mutex_unlock( &rtsp->lock );
 559
 560                     httpd_ServerIP( cl, ip );
 561
 562                     if( ( src != NULL ) && strcmp( src, ip ) )
 563                     {
 564                         /* Specify source IP if it is different from the RTSP
 565                          * control connection server address */
 566                         char *ptr = strchr( src, '%' );
 567                         if( ptr != NULL ) *ptr = '\0'; /* remove scope ID */
 568
 569                         httpd_MsgAdd( answer, "Transport",
 570                                       "RTP/AVP/UDP;unicast;source=%s;"
 571                                       "client_port=%u-%u;server_port=%u-%u;"
 572                                       "mode=play",
 573                                       src, loport, loport + 1, sport,
 574                                       sport + 1 );
 575                     }
 576                     else
 577                     {
 578                         httpd_MsgAdd( answer, "Transport",
 579                                       "RTP/AVP/UDP;unicast;"
 580                                       "client_port=%u-%u;server_port=%u-%u;"
 581                                       "mode=play",
 582                                       loport, loport + 1, sport, sport + 1 );
 583                     }
 584
 585                     answer->i_status = 200;
 586                     free( src );
 587                 }
 588                 break;
 589             }
 590             break;
 591
 592         case HTTPD_MSG_PLAY:
 593         {
 594             rtsp_session_t *ses;
 595             answer->i_status = 200;
 596
 597             psz_session = httpd_MsgGet( query, "Session" );
 598             if( httpd_MsgGet( query, "Range" ) != NULL )
 599             {
 600                 answer->i_status = 456; /* cannot seek */
 601                 break;
 602             }
 603
 604             vlc_mutex_lock( &rtsp->lock );
 605             ses = RtspClientGet( rtsp, psz_session );
 606             if( ses != NULL )
 607             {
 608                 for( int i = 0; i < ses->trackc; i++ )
 609                 {
 610                     rtsp_strack_t *tr = ses->trackv + i;
 611                     if( !tr->playing
 612                      && ( ( id == NULL ) || ( tr->id == id->sout_id ) ) )
 613                     {
 614                         tr->playing = VLC_TRUE;
 615                         rtp_add_sink( tr->id, tr->access );
 616                     }
 617                 }
 618             }
 619             vlc_mutex_unlock( &rtsp->lock );
 620
 621             if( httpd_MsgGet( query, "Scale" ) != NULL )
 622                 httpd_MsgAdd( answer, "Scale", "1." );
 623             break;
 624         }
 625
 626         case HTTPD_MSG_PAUSE:
 627             answer->i_status = 405;
 628             httpd_MsgAdd( answer, "Allow",
 629                           "%s, TEARDOWN, PLAY, GET_PARAMETER",
 630                           ( id != NULL ) ? "SETUP" : "DESCRIBE" );
 631             break;
 632
 633         case HTTPD_MSG_GETPARAMETER:
 634             if( query->i_body > 0 )
 635             {
 636                 answer->i_status = 451;
 637                 break;
 638             }
 639
 640             psz_session = httpd_MsgGet( query, "Session" );
 641             answer->i_status = 200;
 642             break;
 643
 644         case HTTPD_MSG_TEARDOWN:
 645         {
 646             rtsp_session_t *ses;
 647
 648             answer->i_status = 200;
 649
 650             psz_session = httpd_MsgGet( query, "Session" );
 651
 652             vlc_mutex_lock( &rtsp->lock );
 653             ses = RtspClientGet( rtsp, psz_session );
 654             if( ses != NULL )
 655             {
 656                 if( id == NULL ) /* Delete the entire session */
 657                     RtspClientDel( rtsp, ses );
 658                 else /* Delete one track from the session */
 659                 for( int i = 0; i < ses->trackc; i++ )
 660                 {
 661                     if( ses->trackv[i].id == id->sout_id )
 662                     {
 663                         rtp_del_sink( id->sout_id, ses->trackv[i].access );
 664                         sout_AccessOutDelete( ses->trackv[i].access );
 665                         REMOVE_ELEM( ses->trackv, ses->trackc, i );
 666                     }
 667                 }
 668             }
 669             vlc_mutex_unlock( &rtsp->lock );
 670             break;
 671         }
 672
 673         default:
 674             return VLC_EGENERIC;
 675     }
 676
 677     httpd_MsgAdd( answer, "Server", "%s", PACKAGE_STRING );
 678     if( psz_session )
 679         httpd_MsgAdd( answer, "Session", "%s"/*;timeout=5*/, psz_session );
 680
 681     httpd_MsgAdd( answer, "Content-Length", "%d", answer->i_body );
 682     httpd_MsgAdd( answer, "Cache-Control", "no-cache" );
 683
 684     psz = httpd_MsgGet( query, "Cseq" );
 685     if( psz != NULL )
 686         httpd_MsgAdd( answer, "Cseq", "%s", psz );
 687     psz = httpd_MsgGet( query, "Timestamp" );
 688     if( psz != NULL )
 689         httpd_MsgAdd( answer, "Timestamp", "%s", psz );
 690
 691     return VLC_SUCCESS;
 692 }
 693
 694
 695 /** Aggregate RTSP callback */
 696 static int RtspCallback( httpd_callback_sys_t *p_args,
 697                          httpd_client_t *cl,
 698                          httpd_message_t *answer,
 699                          const httpd_message_t *query )
 700 {
 701     return RtspHandler( (rtsp_stream_t *)p_args, NULL, cl, answer, query );
 702 }
 703
 704
 705 /** Non-aggregate RTSP callback */
 706 static int RtspCallbackId( httpd_callback_sys_t *p_args,
 707                            httpd_client_t *cl,
 708                            httpd_message_t *answer,
 709                            const httpd_message_t *query )
 710 {
 711     rtsp_stream_id_t *id = (rtsp_stream_id_t *)p_args;
 712     return RtspHandler( id->stream, id, cl, answer, query );
 713 }