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