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     int                fd;
 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                 net_Close( tr->fd );
 221                 REMOVE_ELEM( ses->trackv, ses->trackc, j );
 222             }
 223         }
 224     }
 225
 226     vlc_mutex_unlock( &rtsp->lock );
 227     httpd_UrlDelete( id->url );
 228     free( id );
 229 }
 230
 231
 232 /** rtsp must be locked */
 233 static
 234 rtsp_session_t *RtspClientNew( rtsp_stream_t *rtsp )
 235 {
 236     rtsp_session_t *s = malloc( sizeof( *s ) );
 237     if( s == NULL )
 238         return NULL;
 239
 240     s->stream = rtsp;
 241     vlc_rand_bytes (&s->id, sizeof (s->id));
 242     s->trackc = 0;
 243     s->trackv = NULL;
 244
 245     TAB_APPEND( rtsp->sessionc, rtsp->sessionv, s );
 246
 247     return s;
 248 }
 249
 250
 251 /** rtsp must be locked */
 252 static
 253 rtsp_session_t *RtspClientGet( rtsp_stream_t *rtsp, const char *name )
 254 {
 255     char *end;
 256     uint64_t id;
 257     int i;
 258
 259     if( name == NULL )
 260         return NULL;
 261
 262     errno = 0;
 263     id = strtoull( name, &end, 0x10 );
 264     if( errno || *end )
 265         return NULL;
 266
 267     /* FIXME: use a hash/dictionary */
 268     for( i = 0; i < rtsp->sessionc; i++ )
 269     {
 270         if( rtsp->sessionv[i]->id == id )
 271             return rtsp->sessionv[i];
 272     }
 273     return NULL;
 274 }
 275
 276
 277 /** rtsp must be locked */
 278 static
 279 void RtspClientDel( rtsp_stream_t *rtsp, rtsp_session_t *session )
 280 {
 281     int i;
 282     TAB_REMOVE( rtsp->sessionc, rtsp->sessionv, session );
 283
 284     for( i = 0; i < session->trackc; i++ )
 285         rtp_del_sink( session->trackv[i].id, session->trackv[i].fd );
 286
 287     free( session->trackv );
 288     free( session );
 289 }
 290
 291
 292 /** Finds the next transport choice */
 293 static inline const char *transport_next( const char *str )
 294 {
 295     /* Looks for comma */
 296     str = strchr( str, ',' );
 297     if( str == NULL )
 298         return NULL; /* No more transport options */
 299
 300     str++; /* skips comma */
 301     while( strchr( "\r\n\t ", *str ) )
 302         str++;
 303
 304     return (*str) ? str : NULL;
 305 }
 306
 307
 308 /** Finds the next transport parameter */
 309 static inline const char *parameter_next( const char *str )
 310 {
 311     while( strchr( ",;", *str ) == NULL )
 312         str++;
 313
 314     return (*str == ';') ? (str + 1) : NULL;
 315 }
 316
 317
 318 /** RTSP requests handler
 319  * @param id selected track for non-aggregate URLs,
 320  *           NULL for aggregate URLs
 321  */
 322 static int RtspHandler( rtsp_stream_t *rtsp, rtsp_stream_id_t *id,
 323                         httpd_client_t *cl,
 324                         httpd_message_t *answer,
 325                         const httpd_message_t *query )
 326 {
 327     sout_stream_t *p_stream = rtsp->owner;
 328     char psz_sesbuf[17];
 329     const char *psz_session = NULL, *psz;
 330
 331     if( answer == NULL || query == NULL || cl == NULL )
 332         return VLC_SUCCESS;
 333
 334     /* */
 335     answer->i_proto = HTTPD_PROTO_RTSP;
 336     answer->i_version= query->i_version;
 337     answer->i_type   = HTTPD_MSG_ANSWER;
 338     answer->i_body = 0;
 339     answer->p_body = NULL;
 340
 341     if( httpd_MsgGet( query, "Require" ) != NULL )
 342     {
 343         answer->i_status = 551;
 344         httpd_MsgAdd( answer, "Unsupported", "%s",
 345                       httpd_MsgGet( query, "Require" ) );
 346     }
 347     else
 348     switch( query->i_type )
 349     {
 350         case HTTPD_MSG_DESCRIBE:
 351         {   /* Aggregate-only */
 352             if( id != NULL )
 353             {
 354                 answer->i_status = 460;
 355                 break;
 356             }
 357
 358             char ip[NI_MAXNUMERICHOST], *ptr;
 359             char control[sizeof("rtsp://[]:12345/") + sizeof( ip )
 360                             + strlen( rtsp->psz_path )];
 361
 362             /* Build self-referential URL */
 363             httpd_ServerIP( cl, ip );
 364             ptr = strchr( ip, '%' );
 365             if( ptr != NULL )
 366                 *ptr = '\0';
 367
 368             if( strchr( ip, ':' ) != NULL )
 369                 sprintf( control, "rtsp://[%s]:%u/%s", ip, rtsp->port,
 370                          ( rtsp->psz_path != NULL ) ? rtsp->psz_path : "" );
 371             else
 372                 sprintf( control, "rtsp://%s:%u/%s", ip, rtsp->port,
 373                          ( rtsp->psz_path != NULL ) ? rtsp->psz_path : "" );
 374
 375             ptr = SDPGenerate( rtsp->owner, control );
 376
 377             answer->i_status = 200;
 378             httpd_MsgAdd( answer, "Content-Type",  "%s", "application/sdp" );
 379             httpd_MsgAdd( answer, "Content-Base",  "%s", control );
 380             answer->p_body = (uint8_t *)ptr;
 381             answer->i_body = strlen( ptr );
 382             break;
 383         }
 384
 385         case HTTPD_MSG_SETUP:
 386             /* Non-aggregate-only */
 387             if( id == NULL )
 388             {
 389                 answer->i_status = 459;
 390                 break;
 391             }
 392
 393             psz_session = httpd_MsgGet( query, "Session" );
 394             answer->i_status = 461;
 395
 396             for( const char *tpt = httpd_MsgGet( query, "Transport" );
 397                  tpt != NULL;
 398                  tpt = transport_next( tpt ) )
 399             {
 400                 vlc_bool_t b_multicast = VLC_TRUE, b_unsupp = VLC_FALSE;
 401                 unsigned loport = 5004, hiport = 5005; /* from RFC3551 */
 402
 403                 /* Check transport protocol. */
 404                 /* Currently, we only support RTP/AVP over UDP */
 405                 if( strncmp( tpt, "RTP/AVP", 7 ) )
 406                     continue;
 407                 tpt += 7;
 408                 if( strncmp( tpt, "/UDP", 4 ) == 0 )
 409                     tpt += 4;
 410                 if( strchr( ";,", *tpt ) == NULL )
 411                     continue;
 412
 413                 /* Parse transport options */
 414                 for( const char *opt = parameter_next( tpt );
 415                      opt != NULL;
 416                      opt = parameter_next( opt ) )
 417                 {
 418                     if( strncmp( opt, "multicast", 9 ) == 0)
 419                         b_multicast = VLC_TRUE;
 420                     else
 421                     if( strncmp( opt, "unicast", 7 ) == 0 )
 422                         b_multicast = VLC_FALSE;
 423                     else
 424                     if( sscanf( opt, "client_port=%u-%u", &loport, &hiport )
 425                                 == 2 )
 426                         ;
 427                     else
 428                     if( strncmp( opt, "mode=", 5 ) == 0 )
 429                     {
 430                         if( strncasecmp( opt + 5, "play", 4 )
 431                          && strncasecmp( opt + 5, "\"PLAY\"", 6 ) )
 432                         {
 433                             /* Not playing?! */
 434                             b_unsupp = VLC_TRUE;
 435                             break;
 436                         }
 437                     }
 438                     else
 439                     if( strncmp( opt,"destination=", 12 ) == 0 )
 440                     {
 441                         answer->i_status = 403;
 442                         b_unsupp = VLC_TRUE;
 443                     }
 444                     else
 445                     {
 446                     /*
 447                      * Every other option is unsupported:
 448                      *
 449                      * "source" and "append" are invalid (server-only);
 450                      * "ssrc" also (as clarified per RFC2326bis).
 451                      *
 452                      * For multicast, "port", "layers", "ttl" are set by the
 453                      * stream output configuration.
 454                      *
 455                      * For unicast, we want to decide "server_port" values.
 456                      *
 457                      * "interleaved" is not implemented.
 458                      */
 459                         b_unsupp = VLC_TRUE;
 460                         break;
 461                     }
 462                 }
 463
 464                 if( b_unsupp )
 465                     continue;
 466
 467                 if( b_multicast )
 468                 {
 469                     const char *dst = id->dst;
 470                     if( dst == NULL )
 471                         continue;
 472
 473                     if( psz_session == NULL )
 474                     {
 475                         /* Create a dummy session ID */
 476                         snprintf( psz_sesbuf, sizeof( psz_sesbuf ), "%d",
 477                                   rand() );
 478                         psz_session = psz_sesbuf;
 479                     }
 480                     answer->i_status = 200;
 481
 482                     httpd_MsgAdd( answer, "Transport",
 483                                   "RTP/AVP/UDP;destination=%s;port=%u-%u;"
 484                                   "ttl=%d;mode=play",
 485                                   dst, id->loport, id->hiport,
 486                                   ( id->ttl > 0 ) ? id->ttl : 1 );
 487                 }
 488                 else
 489                 {
 490                     char ip[NI_MAXNUMERICHOST], src[NI_MAXNUMERICHOST];
 491                     rtsp_session_t *ses = NULL;
 492                     rtsp_strack_t track = { id->sout_id, -1, VLC_FALSE };
 493                     int sport;
 494
 495                     if( httpd_ClientIP( cl, ip ) == NULL )
 496                     {
 497                         answer->i_status = 500;
 498                         continue;
 499                     }
 500
 501                     track.fd = net_ConnectDgram( p_stream, ip, loport, -1,
 502                                                  IPPROTO_UDP );
 503                     if( track.fd == -1 )
 504                     {
 505                         msg_Err( p_stream,
 506                                  "cannot create RTP socket for %s port %u",
 507                                  ip, loport );
 508                         answer->i_status = 500;
 509                         continue;
 510                     }
 511
 512                     net_GetSockAddress( track.fd, src, &sport );
 513
 514                     vlc_mutex_lock( &rtsp->lock );
 515                     if( psz_session == NULL )
 516                     {
 517                         ses = RtspClientNew( rtsp );
 518                         snprintf( psz_sesbuf, sizeof( psz_sesbuf ), I64Fx,
 519                                   ses->id );
 520                         psz_session = psz_sesbuf;
 521                     }
 522                     else
 523                     {
 524                         /* FIXME: we probably need to remove an access out,
 525                          * if there is already one for the same ID */
 526                         ses = RtspClientGet( rtsp, psz_session );
 527                         if( ses == NULL )
 528                         {
 529                             answer->i_status = 454;
 530                             vlc_mutex_unlock( &rtsp->lock );
 531                             continue;
 532                         }
 533                     }
 534
 535                     INSERT_ELEM( ses->trackv, ses->trackc, ses->trackc,
 536                                  track );
 537                     vlc_mutex_unlock( &rtsp->lock );
 538
 539                     httpd_ServerIP( cl, ip );
 540
 541                     if( strcmp( src, ip ) )
 542                     {
 543                         /* Specify source IP if it is different from the RTSP
 544                          * control connection server address */
 545                         char *ptr = strchr( src, '%' );
 546                         if( ptr != NULL ) *ptr = '\0'; /* remove scope ID */
 547
 548                         httpd_MsgAdd( answer, "Transport",
 549                                       "RTP/AVP/UDP;unicast;source=%s;"
 550                                       "client_port=%u-%u;server_port=%u-%u;"
 551                                       "mode=play",
 552                                       src, loport, loport + 1, sport,
 553                                       sport + 1 );
 554                     }
 555                     else
 556                     {
 557                         httpd_MsgAdd( answer, "Transport",
 558                                       "RTP/AVP/UDP;unicast;"
 559                                       "client_port=%u-%u;server_port=%u-%u;"
 560                                       "mode=play",
 561                                       loport, loport + 1, sport, sport + 1 );
 562                     }
 563
 564                     answer->i_status = 200;
 565                 }
 566                 break;
 567             }
 568             break;
 569
 570         case HTTPD_MSG_PLAY:
 571         {
 572             rtsp_session_t *ses;
 573             answer->i_status = 200;
 574
 575             psz_session = httpd_MsgGet( query, "Session" );
 576             if( httpd_MsgGet( query, "Range" ) != NULL )
 577             {
 578                 answer->i_status = 456; /* cannot seek */
 579                 break;
 580             }
 581
 582             vlc_mutex_lock( &rtsp->lock );
 583             ses = RtspClientGet( rtsp, psz_session );
 584             if( ses != NULL )
 585             {
 586                 for( int i = 0; i < ses->trackc; i++ )
 587                 {
 588                     rtsp_strack_t *tr = ses->trackv + i;
 589                     if( !tr->playing
 590                      && ( ( id == NULL ) || ( tr->id == id->sout_id ) ) )
 591                     {
 592                         tr->playing = VLC_TRUE;
 593                         rtp_add_sink( tr->id, tr->fd );
 594                     }
 595                 }
 596             }
 597             vlc_mutex_unlock( &rtsp->lock );
 598
 599             if( httpd_MsgGet( query, "Scale" ) != NULL )
 600                 httpd_MsgAdd( answer, "Scale", "1." );
 601             break;
 602         }
 603
 604         case HTTPD_MSG_PAUSE:
 605             answer->i_status = 405;
 606             httpd_MsgAdd( answer, "Allow",
 607                           "%s, TEARDOWN, PLAY, GET_PARAMETER",
 608                           ( id != NULL ) ? "SETUP" : "DESCRIBE" );
 609             break;
 610
 611         case HTTPD_MSG_GETPARAMETER:
 612             if( query->i_body > 0 )
 613             {
 614                 answer->i_status = 451;
 615                 break;
 616             }
 617
 618             psz_session = httpd_MsgGet( query, "Session" );
 619             answer->i_status = 200;
 620             break;
 621
 622         case HTTPD_MSG_TEARDOWN:
 623         {
 624             rtsp_session_t *ses;
 625
 626             answer->i_status = 200;
 627
 628             psz_session = httpd_MsgGet( query, "Session" );
 629
 630             vlc_mutex_lock( &rtsp->lock );
 631             ses = RtspClientGet( rtsp, psz_session );
 632             if( ses != NULL )
 633             {
 634                 if( id == NULL ) /* Delete the entire session */
 635                     RtspClientDel( rtsp, ses );
 636                 else /* Delete one track from the session */
 637                 for( int i = 0; i < ses->trackc; i++ )
 638                 {
 639                     if( ses->trackv[i].id == id->sout_id )
 640                     {
 641                         rtp_del_sink( id->sout_id, ses->trackv[i].fd );
 642                         REMOVE_ELEM( ses->trackv, ses->trackc, i );
 643                     }
 644                 }
 645             }
 646             vlc_mutex_unlock( &rtsp->lock );
 647             break;
 648         }
 649
 650         default:
 651             return VLC_EGENERIC;
 652     }
 653
 654     httpd_MsgAdd( answer, "Server", "%s", PACKAGE_STRING );
 655     if( psz_session )
 656         httpd_MsgAdd( answer, "Session", "%s"/*;timeout=5*/, psz_session );
 657
 658     httpd_MsgAdd( answer, "Content-Length", "%d", answer->i_body );
 659     httpd_MsgAdd( answer, "Cache-Control", "no-cache" );
 660
 661     psz = httpd_MsgGet( query, "Cseq" );
 662     if( psz != NULL )
 663         httpd_MsgAdd( answer, "Cseq", "%s", psz );
 664     psz = httpd_MsgGet( query, "Timestamp" );
 665     if( psz != NULL )
 666         httpd_MsgAdd( answer, "Timestamp", "%s", psz );
 667
 668     return VLC_SUCCESS;
 669 }
 670
 671
 672 /** Aggregate RTSP callback */
 673 static int RtspCallback( httpd_callback_sys_t *p_args,
 674                          httpd_client_t *cl,
 675                          httpd_message_t *answer,
 676                          const httpd_message_t *query )
 677 {
 678     return RtspHandler( (rtsp_stream_t *)p_args, NULL, cl, answer, query );
 679 }
 680
 681
 682 /** Non-aggregate RTSP callback */
 683 static int RtspCallbackId( httpd_callback_sys_t *p_args,
 684                            httpd_client_t *cl,
 685                            httpd_message_t *answer,
 686                            const httpd_message_t *query )
 687 {
 688     rtsp_stream_id_t *id = (rtsp_stream_id_t *)p_args;
 689     return RtspHandler( id->stream, id, cl, answer, query );
 690 }