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rtsp.c
资源名称：vlc-1.0.5.zip　[点击查看]
上传用户：kjfoods
上传日期：2020-07-06
资源大小：29949k
文件大小：24k
源码类别：

midi

开发平台：

Unix_Linux

rtsp.c：源码内容
  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: adb5696af5d0d283214979ac9db98c8462e47e11 $
  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.  *****************************************************************************/
  26. /*****************************************************************************
  27.  * Preamble
  28.  *****************************************************************************/
  29. #ifdef HAVE_CONFIG_H
  30. # include "config.h"
  31. #endif
  33. #include <vlc_common.h>
  34. #include <vlc_sout.h>
  36. #include <vlc_httpd.h>
  37. #include <vlc_url.h>
  38. #include <vlc_network.h>
  39. #include <vlc_rand.h>
  40. #include <assert.h>
  41. #include <errno.h>
  42. #include <stdlib.h>
  44. #include "rtp.h"
  46. typedef struct rtsp_session_t rtsp_session_t;
  48. struct rtsp_stream_t
  49. {
  50.     vlc_mutex_t     lock;
  51.     sout_stream_t  *owner;
  52.     httpd_host_t   *host;
  53.     httpd_url_t    *url;
  54.     char           *psz_path;
  55.     const char     *track_fmt;
  56.     unsigned        port;
  58.     int             sessionc;
  59.     rtsp_session_t **sessionv;
  60. };
  63. static int  RtspCallback( httpd_callback_sys_t *p_args,
  64.                           httpd_client_t *cl, httpd_message_t *answer,
  65.                           const httpd_message_t *query );
  66. static int  RtspCallbackId( httpd_callback_sys_t *p_args,
  67.                             httpd_client_t *cl, httpd_message_t *answer,
  68.                             const httpd_message_t *query );
  69. static void RtspClientDel( rtsp_stream_t *rtsp, rtsp_session_t *session );
  71. rtsp_stream_t *RtspSetup( sout_stream_t *p_stream, const vlc_url_t *url )
  72. {
  73.     rtsp_stream_t *rtsp = malloc( sizeof( *rtsp ) );
  75.     if( rtsp == NULL || ( url->i_port > 99999 ) )
  76.     {
  77.         free( rtsp );
  78.         return NULL;
  79.     }
  81.     rtsp->owner = p_stream;
  82.     rtsp->sessionc = 0;
  83.     rtsp->sessionv = NULL;
  84.     rtsp->host = NULL;
  85.     rtsp->url = NULL;
  86.     rtsp->psz_path = NULL;
  87.     vlc_mutex_init( &rtsp->lock );
  89.     rtsp->port = (url->i_port > 0) ? url->i_port : 554;
  90.     rtsp->psz_path = strdup( ( url->psz_path != NULL ) ? url->psz_path : "/" );
  91.     if( rtsp->psz_path == NULL )
  92.         goto error;
  94.     assert( strlen( rtsp->psz_path ) > 0 );
  95.     if( rtsp->psz_path[strlen( rtsp->psz_path ) - 1] == '/' )
  96.         rtsp->track_fmt = "%strackID=%u";
  97.     else
  98.         rtsp->track_fmt = "%s/trackID=%u";
  100.     msg_Dbg( p_stream, "RTSP stream: host %s port %d at %s",
  101.              url->psz_host, rtsp->port, rtsp->psz_path );
  103.     rtsp->host = httpd_HostNew( VLC_OBJECT(p_stream), url->psz_host,
  104.                                 rtsp->port );
  105.     if( rtsp->host == NULL )
  106.         goto error;
  108.     rtsp->url = httpd_UrlNewUnique( rtsp->host, rtsp->psz_path,
  109.                                     NULL, NULL, NULL );
  110.     if( rtsp->url == NULL )
  111.         goto error;
  113.     httpd_UrlCatch( rtsp->url, HTTPD_MSG_DESCRIBE, RtspCallback, (void*)rtsp );
  114.     httpd_UrlCatch( rtsp->url, HTTPD_MSG_SETUP,    RtspCallback, (void*)rtsp );
  115.     httpd_UrlCatch( rtsp->url, HTTPD_MSG_PLAY,     RtspCallback, (void*)rtsp );
  116.     httpd_UrlCatch( rtsp->url, HTTPD_MSG_PAUSE,    RtspCallback, (void*)rtsp );
  117.     httpd_UrlCatch( rtsp->url, HTTPD_MSG_GETPARAMETER, RtspCallback,
  118.                     (void*)rtsp );
  119.     httpd_UrlCatch( rtsp->url, HTTPD_MSG_TEARDOWN, RtspCallback, (void*)rtsp );
  120.     return rtsp;
  122. error:
  123.     RtspUnsetup( rtsp );
  124.     return NULL;
  125. }
  128. void RtspUnsetup( rtsp_stream_t *rtsp )
  129. {
  130.     if( rtsp->url )
  131.         httpd_UrlDelete( rtsp->url );
  133.     while( rtsp->sessionc > 0 )
  134.         RtspClientDel( rtsp, rtsp->sessionv[0] );
  136.     if( rtsp->host )
  137.         httpd_HostDelete( rtsp->host );
  139.     free( rtsp->psz_path );
  140.     vlc_mutex_destroy( &rtsp->lock );
  142.     free( rtsp );
  143. }
  146. struct rtsp_stream_id_t
  147. {
  148.     rtsp_stream_t    *stream;
  149.     sout_stream_id_t *sout_id;
  150.     httpd_url_t      *url;
  151.     const char       *dst;
  152.     int               ttl;
  153.     uint32_t          ssrc;
  154.     uint16_t          loport, hiport;
  155. };
  158. typedef struct rtsp_strack_t rtsp_strack_t;
  160. /* For unicast streaming */
  161. struct rtsp_session_t
  162. {
  163.     rtsp_stream_t *stream;
  164.     uint64_t       id;
  166.     /* output (id-access) */
  167.     int            trackc;
  168.     rtsp_strack_t *trackv;
  169. };
  172. /* Unicast session track */
  173. struct rtsp_strack_t
  174. {
  175.     sout_stream_id_t  *id;
  176.     int                fd;
  177.     bool         playing;
  178. };
  181. rtsp_stream_id_t *RtspAddId( rtsp_stream_t *rtsp, sout_stream_id_t *sid,
  182.                              unsigned num, uint32_t ssrc,
  183.                              /* Multicast stuff - TODO: cleanup */
  184.                              const char *dst, int ttl,
  185.                              unsigned loport, unsigned hiport )
  186. {
  187.     char urlbuf[sizeof( "/trackID=123" ) + strlen( rtsp->psz_path )];
  188.     rtsp_stream_id_t *id = malloc( sizeof( *id ) );
  189.     httpd_url_t *url;
  191.     if( id == NULL )
  192.         return NULL;
  194.     id->stream = rtsp;
  195.     id->sout_id = sid;
  196.     id->ssrc = ssrc;
  197.     /* TODO: can we assume that this need not be strdup'd? */
  198.     id->dst = dst;
  199.     if( id->dst != NULL )
  200.     {
  201.         id->ttl = ttl;
  202.         id->loport = loport;
  203.         id->hiport = hiport;
  204.     }
  206.     /* FIXME: num screws up if any ES has been removed and re-added */
  207.     snprintf( urlbuf, sizeof( urlbuf ), rtsp->track_fmt, rtsp->psz_path,
  208.               num );
  209.     msg_Dbg( rtsp->owner, "RTSP: adding %s", urlbuf );
  210.     url = id->url = httpd_UrlNewUnique( rtsp->host, urlbuf, NULL, NULL, NULL );
  212.     if( url == NULL )
  213.     {
  214.         free( id );
  215.         return NULL;
  216.     }
  218.     httpd_UrlCatch( url, HTTPD_MSG_DESCRIBE, RtspCallbackId, (void *)id );
  219.     httpd_UrlCatch( url, HTTPD_MSG_SETUP,    RtspCallbackId, (void *)id );
  220.     httpd_UrlCatch( url, HTTPD_MSG_PLAY,     RtspCallbackId, (void *)id );
  221.     httpd_UrlCatch( url, HTTPD_MSG_PAUSE,    RtspCallbackId, (void *)id );
  222.     httpd_UrlCatch( url, HTTPD_MSG_GETPARAMETER, RtspCallbackId, (void *)id );
  223.     httpd_UrlCatch( url, HTTPD_MSG_TEARDOWN, RtspCallbackId, (void *)id );
  225.     return id;
  226. }
  229. void RtspDelId( rtsp_stream_t *rtsp, rtsp_stream_id_t *id )
  230. {
  231.     httpd_UrlDelete( id->url );
  233.     vlc_mutex_lock( &rtsp->lock );
  234.     for( int i = 0; i < rtsp->sessionc; i++ )
  235.     {
  236.         rtsp_session_t *ses = rtsp->sessionv[i];
  238.         for( int j = 0; j < ses->trackc; j++ )
  239.         {
  240.             if( ses->trackv[j].id == id->sout_id )
  241.             {
  242.                 rtsp_strack_t *tr = ses->trackv + j;
  243.                 rtp_del_sink( tr->id, tr->fd );
  244.                 REMOVE_ELEM( ses->trackv, ses->trackc, j );
  245.             }
  246.         }
  247.     }
  249.     vlc_mutex_unlock( &rtsp->lock );
  250.     free( id );
  251. }
  254. /** rtsp must be locked */
  255. static
  256. rtsp_session_t *RtspClientNew( rtsp_stream_t *rtsp )
  257. {
  258.     rtsp_session_t *s = malloc( sizeof( *s ) );
  259.     if( s == NULL )
  260.         return NULL;
  262.     s->stream = rtsp;
  263.     vlc_rand_bytes (&s->id, sizeof (s->id));
  264.     s->trackc = 0;
  265.     s->trackv = NULL;
  267.     TAB_APPEND( rtsp->sessionc, rtsp->sessionv, s );
  269.     return s;
  270. }
  273. /** rtsp must be locked */
  274. static
  275. rtsp_session_t *RtspClientGet( rtsp_stream_t *rtsp, const char *name )
  276. {
  277.     char *end;
  278.     uint64_t id;
  279.     int i;
  281.     if( name == NULL )
  282.         return NULL;
  284.     errno = 0;
  285.     id = strtoull( name, &end, 0x10 );
  286.     if( errno || *end )
  287.         return NULL;
  289.     /* FIXME: use a hash/dictionary */
  290.     for( i = 0; i < rtsp->sessionc; i++ )
  291.     {
  292.         if( rtsp->sessionv[i]->id == id )
  293.             return rtsp->sessionv[i];
  294.     }
  295.     return NULL;
  296. }
  299. /** rtsp must be locked */
  300. static
  301. void RtspClientDel( rtsp_stream_t *rtsp, rtsp_session_t *session )
  302. {
  303.     int i;
  304.     TAB_REMOVE( rtsp->sessionc, rtsp->sessionv, session );
  306.     for( i = 0; i < session->trackc; i++ )
  307.         rtp_del_sink( session->trackv[i].id, session->trackv[i].fd );
  309.     free( session->trackv );
  310.     free( session );
  311. }
  314. /** Finds the next transport choice */
  315. static inline const char *transport_next( const char *str )
  316. {
  317.     /* Looks for comma */
  318.     str = strchr( str, ',' );
  319.     if( str == NULL )
  320.         return NULL; /* No more transport options */
  322.     str++; /* skips comma */
  323.     while( strchr( "rnt ", *str ) )
  324.         str++;
  326.     return (*str) ? str : NULL;
  327. }
  330. /** Finds the next transport parameter */
  331. static inline const char *parameter_next( const char *str )
  332. {
  333.     while( strchr( ",;", *str ) == NULL )
  334.         str++;
  336.     return (*str == ';') ? (str + 1) : NULL;
  337. }
  340. /** RTSP requests handler
  341.  * @param id selected track for non-aggregate URLs,
  342.  *           NULL for aggregate URLs
  343.  */
  344. static int RtspHandler( rtsp_stream_t *rtsp, rtsp_stream_id_t *id,
  345.                         httpd_client_t *cl,
  346.                         httpd_message_t *answer,
  347.                         const httpd_message_t *query )
  348. {
  349.     sout_stream_t *p_stream = rtsp->owner;
  350.     char psz_sesbuf[17];
  351.     const char *psz_session = NULL, *psz;
  352.     char control[sizeof("rtsp://[]:12345") + NI_MAXNUMERICHOST
  353.                   + strlen( rtsp->psz_path )];
  354.     time_t now;
  356.     time (&now);
  358.     if( answer == NULL || query == NULL || cl == NULL )
  359.         return VLC_SUCCESS;
  360.     else
  361.     {
  362.         /* Build self-referential control URL */
  363.         char ip[NI_MAXNUMERICHOST], *ptr;
  365.         httpd_ServerIP( cl, ip );
  366.         ptr = strchr( ip, '%' );
  367.         if( ptr != NULL )
  368.             *ptr = '';
  370.         if( strchr( ip, ':' ) != NULL )
  371.             sprintf( control, "rtsp://[%s]:%u%s", ip, rtsp->port,
  372.                      rtsp->psz_path );
  373.         else
  374.             sprintf( control, "rtsp://%s:%u%s", ip, rtsp->port,
  375.                      rtsp->psz_path );
  376.     }
  378.     /* */
  379.     answer->i_proto = HTTPD_PROTO_RTSP;
  380.     answer->i_version= 0;
  381.     answer->i_type   = HTTPD_MSG_ANSWER;
  382.     answer->i_body = 0;
  383.     answer->p_body = NULL;
  385.     httpd_MsgAdd( answer, "Server", "%s", PACKAGE_STRING );
  387.     /* Date: is always allowed, and sometimes mandatory with RTSP/2.0. */
  388.     struct tm ut;
  389.     if (gmtime_r (&now, &ut) != NULL)
  390.     {   /* RFC1123 format, GMT is mandatory */
  391.         static const char wdays[7][4] = {
  392.             "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
  393.         static const char mons[12][4] = {
  394.             "Jan", "Feb", "Mar", "Apr", "May", "Jun",
  395.             "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
  396.         httpd_MsgAdd (answer, "Date", "%s, %02u %s %04u %02u:%02u:%02u GMT",
  397.                       wdays[ut.tm_wday], ut.tm_mday, mons[ut.tm_mon],
  398.                       1900 + ut.tm_year, ut.tm_hour, ut.tm_min, ut.tm_sec);
  399.     }
  401.     if( query->i_proto != HTTPD_PROTO_RTSP )
  402.     {
  403.         answer->i_status = 505;
  404.     }
  405.     else
  406.     if( httpd_MsgGet( query, "Require" ) != NULL )
  407.     {
  408.         answer->i_status = 551;
  409.         httpd_MsgAdd( answer, "Unsupported", "%s",
  410.                       httpd_MsgGet( query, "Require" ) );
  411.     }
  412.     else
  413.     switch( query->i_type )
  414.     {
  415.         case HTTPD_MSG_DESCRIBE:
  416.         {   /* Aggregate-only */
  417.             if( id != NULL )
  418.             {
  419.                 answer->i_status = 460;
  420.                 break;
  421.             }
  423.             answer->i_status = 200;
  424.             httpd_MsgAdd( answer, "Content-Type",  "%s", "application/sdp" );
  425.             httpd_MsgAdd( answer, "Content-Base",  "%s", control );
  426.             answer->p_body = (uint8_t *)SDPGenerate( rtsp->owner, control );
  427.             if( answer->p_body != NULL )
  428.                 answer->i_body = strlen( (char *)answer->p_body );
  429.             else
  430.                 answer->i_status = 500;
  431.             break;
  432.         }
  434.         case HTTPD_MSG_SETUP:
  435.             /* Non-aggregate-only */
  436.             if( id == NULL )
  437.             {
  438.                 answer->i_status = 459;
  439.                 break;
  440.             }
  442.             psz_session = httpd_MsgGet( query, "Session" );
  443.             answer->i_status = 461;
  445.             for( const char *tpt = httpd_MsgGet( query, "Transport" );
  446.                  tpt != NULL;
  447.                  tpt = transport_next( tpt ) )
  448.             {
  449.                 bool b_multicast = true, b_unsupp = false;
  450.                 unsigned loport = 5004, hiport = 5005; /* from RFC3551 */
  452.                 /* Check transport protocol. */
  453.                 /* Currently, we only support RTP/AVP over UDP */
  454.                 if( strncmp( tpt, "RTP/AVP", 7 ) )
  455.                     continue;
  456.                 tpt += 7;
  457.                 if( strncmp( tpt, "/UDP", 4 ) == 0 )
  458.                     tpt += 4;
  459.                 if( strchr( ";,", *tpt ) == NULL )
  460.                     continue;
  462.                 /* Parse transport options */
  463.                 for( const char *opt = parameter_next( tpt );
  464.                      opt != NULL;
  465.                      opt = parameter_next( opt ) )
  466.                 {
  467.                     if( strncmp( opt, "multicast", 9 ) == 0)
  468.                         b_multicast = true;
  469.                     else
  470.                     if( strncmp( opt, "unicast", 7 ) == 0 )
  471.                         b_multicast = false;
  472.                     else
  473.                     if( sscanf( opt, "client_port=%u-%u", &loport, &hiport )
  474.                                 == 2 )
  475.                         ;
  476.                     else
  477.                     if( strncmp( opt, "mode=", 5 ) == 0 )
  478.                     {
  479.                         if( strncasecmp( opt + 5, "play", 4 )
  480.                          && strncasecmp( opt + 5, ""PLAY"", 6 ) )
  481.                         {
  482.                             /* Not playing?! */
  483.                             b_unsupp = true;
  484.                             break;
  485.                         }
  486.                     }
  487.                     else
  488.                     if( strncmp( opt,"destination=", 12 ) == 0 )
  489.                     {
  490.                         answer->i_status = 403;
  491.                         b_unsupp = true;
  492.                     }
  493.                     else
  494.                     {
  495.                     /*
  496.                      * Every other option is unsupported:
  497.                      *
  498.                      * "source" and "append" are invalid (server-only);
  499.                      * "ssrc" also (as clarified per RFC2326bis).
  500.                      *
  501.                      * For multicast, "port", "layers", "ttl" are set by the
  502.                      * stream output configuration.
  503.                      *
  504.                      * For unicast, we want to decide "server_port" values.
  505.                      *
  506.                      * "interleaved" is not implemented.
  507.                      */
  508.                         b_unsupp = true;
  509.                         break;
  510.                     }
  511.                 }
  513.                 if( b_unsupp )
  514.                     continue;
  516.                 if( b_multicast )
  517.                 {
  518.                     const char *dst = id->dst;
  519.                     if( dst == NULL )
  520.                         continue;
  522.                     if( psz_session == NULL )
  523.                     {
  524.                         /* Create a dummy session ID */
  525.                         snprintf( psz_sesbuf, sizeof( psz_sesbuf ), "%d",
  526.                                   rand() );
  527.                         psz_session = psz_sesbuf;
  528.                     }
  529.                     answer->i_status = 200;
  531.                     httpd_MsgAdd( answer, "Transport",
  532.                                   "RTP/AVP/UDP;destination=%s;port=%u-%u;"
  533.                                   "ttl=%d;mode=play",
  534.                                   dst, id->loport, id->hiport,
  535.                                   ( id->ttl > 0 ) ? id->ttl : 1 );
  536.                 }
  537.                 else
  538.                 {
  539.                     char ip[NI_MAXNUMERICHOST], src[NI_MAXNUMERICHOST];
  540.                     rtsp_session_t *ses = NULL;
  541.                     rtsp_strack_t track = { id->sout_id, -1, false };
  542.                     int sport;
  544.                     if( httpd_ClientIP( cl, ip ) == NULL )
  545.                     {
  546.                         answer->i_status = 500;
  547.                         continue;
  548.                     }
  550.                     track.fd = net_ConnectDgram( p_stream, ip, loport, -1,
  551.                                                  IPPROTO_UDP );
  552.                     if( track.fd == -1 )
  553.                     {
  554.                         msg_Err( p_stream,
  555.                                  "cannot create RTP socket for %s port %u",
  556.                                  ip, loport );
  557.                         answer->i_status = 500;
  558.                         continue;
  559.                     }
  561.                     net_GetSockAddress( track.fd, src, &sport );
  563.                     vlc_mutex_lock( &rtsp->lock );
  564.                     if( psz_session == NULL )
  565.                     {
  566.                         ses = RtspClientNew( rtsp );
  567.                         snprintf( psz_sesbuf, sizeof( psz_sesbuf ), "%"PRIx64,
  568.                                   ses->id );
  569.                         psz_session = psz_sesbuf;
  570.                     }
  571.                     else
  572.                     {
  573.                         /* FIXME: we probably need to remove an access out,
  574.                          * if there is already one for the same ID */
  575.                         ses = RtspClientGet( rtsp, psz_session );
  576.                         if( ses == NULL )
  577.                         {
  578.                             answer->i_status = 454;
  579.                             vlc_mutex_unlock( &rtsp->lock );
  580.                             continue;
  581.                         }
  582.                     }
  584.                     INSERT_ELEM( ses->trackv, ses->trackc, ses->trackc,
  585.                                  track );
  586.                     vlc_mutex_unlock( &rtsp->lock );
  588.                     httpd_ServerIP( cl, ip );
  590.                     if( strcmp( src, ip ) )
  591.                     {
  592.                         /* Specify source IP if it is different from the RTSP
  593.                          * control connection server address */
  594.                         char *ptr = strchr( src, '%' );
  595.                         if( ptr != NULL ) *ptr = ''; /* remove scope ID */
  597.                         httpd_MsgAdd( answer, "Transport",
  598.                                       "RTP/AVP/UDP;unicast;source=%s;"
  599.                                       "client_port=%u-%u;server_port=%u-%u;"
  600.                                       "ssrc=%08X;mode=play",
  601.                                       src, loport, loport + 1, sport,
  602.                                       sport + 1, id->ssrc );
  603.                     }
  604.                     else
  605.                     {
  606.                         httpd_MsgAdd( answer, "Transport",
  607.                                       "RTP/AVP/UDP;unicast;"
  608.                                       "client_port=%u-%u;server_port=%u-%u;"
  609.                                       "ssrc=%08X;mode=play",
  610.                                       loport, loport + 1, sport, sport + 1,
  611.                                       id->ssrc );
  612.                     }
  614.                     answer->i_status = 200;
  615.                 }
  616.                 break;
  617.             }
  618.             break;
  620.         case HTTPD_MSG_PLAY:
  621.         {
  622.             rtsp_session_t *ses;
  623.             answer->i_status = 200;
  625.             psz_session = httpd_MsgGet( query, "Session" );
  626.             const char *range = httpd_MsgGet (query, "Range");
  627.             if (range && strncmp (range, "npt=", 4))
  628.             {
  629.                 answer->i_status = 501;
  630.                 break;
  631.             }
  633.             vlc_mutex_lock( &rtsp->lock );
  634.             ses = RtspClientGet( rtsp, psz_session );
  635.             if( ses != NULL )
  636.             {
  637.                 /* FIXME: we really need to limit the number of tracks... */
  638.                 char info[ses->trackc * ( strlen( control )
  639.                               + sizeof("url=/trackID=123;seq=65535;"
  640.                                        "rtptime=4294967295, ") ) + 1];
  641.                 size_t infolen = 0;
  643.                 for( int i = 0; i < ses->trackc; i++ )
  644.                 {
  645.                     rtsp_strack_t *tr = ses->trackv + i;
  646.                     if( ( id == NULL ) || ( tr->id == id->sout_id ) )
  647.                     {
  648.                         if( !tr->playing )
  649.                         {
  650.                             tr->playing = true;
  651.                             rtp_add_sink( tr->id, tr->fd, false );
  652.                         }
  653.                         /* This is racy, as the first packets may have
  654.                          * already been sent before we fetch this info:
  655.                          * these extra packets might confuse the client. */
  656.                         infolen += sprintf( info + infolen,
  657.                                     "url=%s/trackID=%u;seq=%u;rtptime=%u, ",
  658.                                             control,
  659.                                             rtp_get_num( tr->id ),
  660.                                             rtp_get_seq( tr->id ),
  661.                                             rtp_get_ts( tr->id ) );
  662.                     }
  663.                 }
  664.                 if( infolen > 0 )
  665.                 {
  666.                     info[infolen - 2] = ''; /* remove trailing ", " */
  667.                     httpd_MsgAdd( answer, "RTP-Info", "%s", info );
  668.                 }
  669.             }
  670.             vlc_mutex_unlock( &rtsp->lock );
  672.             if( httpd_MsgGet( query, "Scale" ) != NULL )
  673.                 httpd_MsgAdd( answer, "Scale", "1." );
  674.             break;
  675.         }
  677.         case HTTPD_MSG_PAUSE:
  678.             answer->i_status = 405;
  679.             httpd_MsgAdd( answer, "Allow",
  680.                           "%s, TEARDOWN, PLAY, GET_PARAMETER",
  681.                           ( id != NULL ) ? "SETUP" : "DESCRIBE" );
  682.             break;
  684.         case HTTPD_MSG_GETPARAMETER:
  685.             if( query->i_body > 0 )
  686.             {
  687.                 answer->i_status = 451;
  688.                 break;
  689.             }
  691.             psz_session = httpd_MsgGet( query, "Session" );
  692.             answer->i_status = 200;
  693.             break;
  695.         case HTTPD_MSG_TEARDOWN:
  696.         {
  697.             rtsp_session_t *ses;
  699.             answer->i_status = 200;
  701.             psz_session = httpd_MsgGet( query, "Session" );
  703.             vlc_mutex_lock( &rtsp->lock );
  704.             ses = RtspClientGet( rtsp, psz_session );
  705.             if( ses != NULL )
  706.             {
  707.                 if( id == NULL ) /* Delete the entire session */
  708.                     RtspClientDel( rtsp, ses );
  709.                 else /* Delete one track from the session */
  710.                 for( int i = 0; i < ses->trackc; i++ )
  711.                 {
  712.                     if( ses->trackv[i].id == id->sout_id )
  713.                     {
  714.                         rtp_del_sink( id->sout_id, ses->trackv[i].fd );
  715.                         REMOVE_ELEM( ses->trackv, ses->trackc, i );
  716.                     }
  717.                 }
  718.             }
  719.             vlc_mutex_unlock( &rtsp->lock );
  720.             break;
  721.         }
  723.         default:
  724.             return VLC_EGENERIC;
  725.     }
  727.     if( psz_session )
  728.         httpd_MsgAdd( answer, "Session", "%s"/*;timeout=5*/, psz_session );
  730.     httpd_MsgAdd( answer, "Content-Length", "%d", answer->i_body );
  731.     httpd_MsgAdd( answer, "Cache-Control", "no-cache" );
  733.     psz = httpd_MsgGet( query, "Cseq" );
  734.     if( psz != NULL )
  735.         httpd_MsgAdd( answer, "Cseq", "%s", psz );
  736.     psz = httpd_MsgGet( query, "Timestamp" );
  737.     if( psz != NULL )
  738.         httpd_MsgAdd( answer, "Timestamp", "%s", psz );
  740.     return VLC_SUCCESS;
  741. }
  744. /** Aggregate RTSP callback */
  745. static int RtspCallback( httpd_callback_sys_t *p_args,
  746.                          httpd_client_t *cl,
  747.                          httpd_message_t *answer,
  748.                          const httpd_message_t *query )
  749. {
  750.     return RtspHandler( (rtsp_stream_t *)p_args, NULL, cl, answer, query );
  751. }
  754. /** Non-aggregate RTSP callback */
  755. static int RtspCallbackId( httpd_callback_sys_t *p_args,
  756.                            httpd_client_t *cl,
  757.                            httpd_message_t *answer,
  758.                            const httpd_message_t *query )
  759. {
  760.     rtsp_stream_id_t *id = (rtsp_stream_id_t *)p_args;
  761.     return RtspHandler( id->stream, id, cl, answer, query );
  762. }