git.sesse.net Git - vlc/blob - src/stream_output/announce.c

   1 /*****************************************************************************
   2  * announce.c : announce handler
   3  *****************************************************************************
   4  * Copyright (C) 2002-2004 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Clément Stenac <zorglub@videolan.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #include <stdlib.h>                                                /* free() */
  28 #include <stdio.h>                                              /* sprintf() */
  29 #include <string.h>                                            /* strerror() */
  30
  31 #include <vlc/vlc.h>
  32 #include <vlc/sout.h>
  33
  34 /*****************************************************************************
  35  * Local prototypes
  36  *****************************************************************************/
  37 #define FREE( p ) if( p ) { free( p ); (p) = NULL; }
  38
  39
  40 /****************************************************************************
  41  * Sout-side functions
  42  ****************************************************************************/
  43
  44 /**
  45  *  Register a new session with the announce handler
  46  *
  47  * \param p_sout a sout instance structure
  48  * \param p_session a session descriptor
  49  * \param p_method an announce method descriptor
  50  * \return VLC_SUCCESS or an error
  51  */
  52 int sout_AnnounceRegister( sout_instance_t *p_sout,
  53                        session_descriptor_t *p_session,
  54                        announce_method_t *p_method )
  55 {
  56     int i_ret;
  57     announce_handler_t *p_announce = (announce_handler_t*)
  58                               vlc_object_find( p_sout,
  59                                               VLC_OBJECT_ANNOUNCE,
  60                                               FIND_ANYWHERE );
  61
  62     if( !p_announce )
  63     {
  64         msg_Dbg( p_sout, "No announce handler found, creating one" );
  65         p_announce = announce_HandlerCreate( p_sout );
  66         if( !p_announce )
  67         {
  68             msg_Err( p_sout, "Creation failed" );
  69             return VLC_ENOMEM;
  70         }
  71         vlc_object_yield( p_announce );
  72         msg_Dbg( p_sout,"Creation done" );
  73     }
  74
  75     i_ret = announce_Register( p_announce, p_session, p_method );
  76     vlc_object_release( p_announce );
  77
  78     return i_ret;
  79 }
  80
  81 /**
  82  *  Register a new session with the announce handler, using a pregenerated SDP
  83  *
  84  * \param p_sout a sout instance structure
  85  * \param psz_sdp the SDP to register
  86  * \param p_method an announce method descriptor
  87  * \return the new session descriptor structure
  88  */
  89 session_descriptor_t *sout_AnnounceRegisterSDP( sout_instance_t *p_sout,
  90                           const char *psz_sdp, announce_method_t *p_method )
  91 {
  92     session_descriptor_t *p_session;
  93     announce_handler_t *p_announce = (announce_handler_t*)
  94                                      vlc_object_find( p_sout,
  95                                               VLC_OBJECT_ANNOUNCE,
  96                                               FIND_ANYWHERE );
  97     if( !p_announce )
  98     {
  99         msg_Dbg( p_sout, "no announce handler found, creating one" );
 100         p_announce = announce_HandlerCreate( p_sout );
 101         if( !p_announce )
 102         {
 103             msg_Err( p_sout, "Creation failed" );
 104             return NULL;
 105         }
 106         vlc_object_yield( p_announce );
 107     }
 108
 109     if( p_method->i_type != METHOD_TYPE_SAP )
 110     {
 111         msg_Warn( p_sout,"forcing SAP announcement");
 112     }
 113
 114     p_session = sout_AnnounceSessionCreate();
 115     p_session->psz_sdp = strdup( psz_sdp );
 116     announce_Register( p_announce, p_session, p_method );
 117
 118     vlc_object_release( p_announce );
 119     return p_session;
 120 }
 121
 122 /**
 123  *  UnRegister an existing session
 124  *
 125  * \param p_sout a sout instance structure
 126  * \param p_session the session descriptor
 127  * \return VLC_SUCCESS or an error
 128  */
 129 int sout_AnnounceUnRegister( sout_instance_t *p_sout,
 130                              session_descriptor_t *p_session )
 131 {
 132     int i_ret;
 133     announce_handler_t *p_announce = (announce_handler_t*)
 134                               vlc_object_find( p_sout,
 135                                               VLC_OBJECT_ANNOUNCE,
 136                                               FIND_ANYWHERE );
 137     if( !p_announce )
 138     {
 139         msg_Dbg( p_sout, "Unable to remove announce: no announce handler" );
 140         return VLC_ENOOBJ;
 141     }
 142     i_ret  = announce_UnRegister( p_announce, p_session );
 143
 144     vlc_object_release( p_announce );
 145
 146     return i_ret;
 147 }
 148
 149 /**
 150  * Create and initialize a session descriptor
 151  *
 152  * \return a new session descriptor
 153  */
 154 session_descriptor_t * sout_AnnounceSessionCreate(void)
 155 {
 156     session_descriptor_t *p_session;
 157
 158     p_session = (session_descriptor_t *)malloc( sizeof(session_descriptor_t));
 159
 160     if( p_session)
 161     {
 162         p_session->p_sap = NULL;
 163         p_session->psz_sdp = NULL;
 164         p_session->psz_name = NULL;
 165         p_session->psz_uri = NULL;
 166         p_session->i_port = 0;
 167         p_session->psz_group = NULL;
 168     }
 169
 170     return p_session;
 171 }
 172
 173 /**
 174  * Destroy a session descriptor and free all
 175  *
 176  * \param p_session the session to destroy
 177  * \return Nothing
 178  */
 179 void sout_AnnounceSessionDestroy( session_descriptor_t *p_session )
 180 {
 181     if( p_session )
 182     {
 183         FREE( p_session->psz_name );
 184         FREE( p_session->psz_group );
 185         FREE( p_session->psz_uri );
 186         FREE( p_session->psz_sdp );
 187         free( p_session );
 188     }
 189 }
 190
 191 /**
 192  * Create and initialize an announcement method structure
 193  *
 194  * \param i_type METHOD_TYPE_SAP or METHOD_TYPE_SLP
 195  * \return a new announce_method structure
 196  */
 197 announce_method_t * sout_AnnounceMethodCreate( int i_type )
 198 {
 199     announce_method_t *p_method;
 200
 201     p_method = (announce_method_t *)malloc( sizeof(announce_method_t) );
 202     if( p_method == NULL )
 203         return NULL;
 204
 205     p_method->i_type = i_type;
 206     return p_method;
 207 }
 208
 209 /************************************************************************
 210  * Announce handler functions (private)
 211  ************************************************************************/
 212
 213 /**
 214  * Create the announce handler object
 215  *
 216  * \param p_this a vlc_object structure
 217  * \return the new announce handler or NULL on error
 218  */
 219 announce_handler_t *__announce_HandlerCreate( vlc_object_t *p_this )
 220 {
 221     announce_handler_t *p_announce;
 222
 223     p_announce = vlc_object_create( p_this, VLC_OBJECT_ANNOUNCE );
 224
 225     if( !p_announce )
 226     {
 227         msg_Err( p_this, "out of memory" );
 228         return NULL;
 229     }
 230
 231     p_announce->p_sap = NULL;
 232
 233     vlc_object_attach( p_announce, p_this->p_vlc);
 234
 235
 236     return p_announce;
 237 }
 238
 239 /**
 240  * Destroy a  announce handler object
 241  *
 242  * \param p_announce the announce handler to destroy
 243  * \return VLC_SUCCESS or an error
 244  */
 245 int announce_HandlerDestroy( announce_handler_t *p_announce )
 246 {
 247
 248     if( p_announce->p_sap )
 249     {
 250         p_announce->p_sap->b_die = VLC_TRUE;
 251         /* Wait for the SAP thread to exit */
 252         vlc_thread_join( p_announce->p_sap );
 253         announce_SAPHandlerDestroy( p_announce->p_sap );
 254     }
 255
 256     /* Free the structure */
 257     vlc_object_destroy( p_announce );
 258
 259     return VLC_SUCCESS;
 260 }
 261
 262 /* Register an announce */
 263 int announce_Register( announce_handler_t *p_announce,
 264                        session_descriptor_t *p_session,
 265                        announce_method_t *p_method )
 266 {
 267
 268     msg_Dbg( p_announce, "registering announce");
 269     if( p_method->i_type == METHOD_TYPE_SAP )
 270     {
 271         /* Do we already have a SAP announce handler ? */
 272         if( !p_announce->p_sap )
 273         {
 274             sap_handler_t *p_sap = announce_SAPHandlerCreate( p_announce );
 275             msg_Dbg( p_announce, "creating SAP announce handler");
 276             if( !p_sap )
 277             {
 278                 msg_Err( p_announce, "SAP handler creation failed" );
 279                 return VLC_ENOOBJ;
 280             }
 281             p_announce->p_sap = p_sap;
 282         }
 283         /* this will set p_session->p_sap for later deletion */
 284         msg_Dbg( p_announce, "adding SAP session");
 285         p_announce->p_sap->pf_add( p_announce->p_sap, p_session );
 286     }
 287     else if( p_method->i_type == METHOD_TYPE_SLP )
 288     {
 289         msg_Dbg( p_announce, "SLP unsupported at the moment" );
 290         return VLC_EGENERIC;
 291     }
 292     else
 293     {
 294         msg_Dbg( p_announce, "Announce type unsupported" );
 295         return VLC_EGENERIC;
 296     }
 297     return VLC_SUCCESS;;
 298 }
 299
 300
 301 /* Unregister an announce */
 302 int announce_UnRegister( announce_handler_t *p_announce,
 303                   session_descriptor_t *p_session )
 304 {
 305     msg_Dbg( p_announce, "unregistering announce" );
 306     if( p_session->p_sap != NULL ) /* SAP Announce */
 307     {
 308         if( !p_announce->p_sap )
 309         {
 310             msg_Err( p_announce, "can't remove announce, no SAP handler");
 311             return VLC_ENOOBJ;
 312         }
 313         p_announce->p_sap->pf_del( p_announce->p_sap, p_session );
 314     }
 315     return VLC_SUCCESS;
 316 }