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Asterisk developer's documentation


app_confbridge.c

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00001 /*
00002  * Asterisk -- An open source telephony toolkit.
00003  *
00004  * Copyright (C) 2007-2008, Digium, Inc.
00005  *
00006  * Joshua Colp <jcolp@digium.com>
00007  *
00008  * See http://www.asterisk.org for more information about
00009  * the Asterisk project. Please do not directly contact
00010  * any of the maintainers of this project for assistance;
00011  * the project provides a web site, mailing lists and IRC
00012  * channels for your use.
00013  *
00014  * This program is free software, distributed under the terms of
00015  * the GNU General Public License Version 2. See the LICENSE file
00016  * at the top of the source tree.
00017  */
00018 
00019 /*! \file
00020  *
00021  * \brief Conference Bridge application
00022  *
00023  * \author\verbatim Joshua Colp <jcolp@digium.com> \endverbatim
00024  *
00025  * This is a conference bridge application utilizing the bridging core.
00026  * \ingroup applications
00027  */
00028 
00029 #include "asterisk.h"
00030 
00031 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 278132 $")
00032 
00033 #include <stdio.h>
00034 #include <stdlib.h>
00035 #include <unistd.h>
00036 #include <string.h>
00037 #include <signal.h>
00038 
00039 #include "asterisk/file.h"
00040 #include "asterisk/logger.h"
00041 #include "asterisk/channel.h"
00042 #include "asterisk/pbx.h"
00043 #include "asterisk/module.h"
00044 #include "asterisk/lock.h"
00045 #include "asterisk/app.h"
00046 #include "asterisk/bridging.h"
00047 #include "asterisk/musiconhold.h"
00048 #include "asterisk/say.h"
00049 #include "asterisk/audiohook.h"
00050 #include "asterisk/astobj2.h"
00051 
00052 /*** DOCUMENTATION
00053         <application name="ConfBridge" language="en_US">
00054                 <synopsis>
00055                         Conference bridge application.
00056                 </synopsis>
00057                 <syntax>
00058                         <parameter name="confno">
00059                                 <para>The conference number</para>
00060                         </parameter>
00061                         <parameter name="options">
00062                                 <optionlist>
00063                                         <option name="a">
00064                                                 <para>Set admin mode.</para>
00065                                         </option>
00066                                         <option name="A">
00067                                                 <para>Set marked mode.</para>
00068                                         </option>
00069                                         <option name="c">
00070                                                 <para>Announce user(s) count on joining a conference.</para>
00071                                         </option>
00072                                         <option name="m">
00073                                                 <para>Set initially muted.</para>
00074                                         </option>
00075                                         <option name="M" hasparams="optional">
00076                                                 <para>Enable music on hold when the conference has a single caller. Optionally,
00077                                                 specify a musiconhold class to use. If one is not provided, it will use the
00078                                                 channel's currently set music class, or <literal>default</literal>.</para>
00079                                                 <argument name="class" required="true" />
00080                                         </option>
00081                                         <option name="1">
00082                                                 <para>Do not play message when first person enters</para>
00083                                         </option>
00084                                         <option name="s">
00085                                                 <para>Present menu (user or admin) when <literal>*</literal> is received
00086                                                 (send to menu).</para>
00087                                         </option>
00088                                         <option name="w">
00089                                                 <para>Wait until the marked user enters the conference.</para>
00090                                         </option>
00091                                         <option name="q">
00092                                                 <para>Quiet mode (don't play enter/leave sounds).</para>
00093                                         </option>
00094             </optionlist>
00095             </parameter>
00096                 </syntax>
00097                 <description>
00098                         <para>Enters the user into a specified conference bridge. The user can exit the conference by hangup only.</para>
00099                         <para>The join sound can be set using the <literal>CONFBRIDGE_JOIN_SOUND</literal> variable and the leave sound can be set using the <literal>CONFBRIDGE_LEAVE_SOUND</literal> variable. These can be unique to the caller.</para>
00100          <note><para>This application will not automatically answer the channel.</para></note>
00101                 </description>
00102         </application>
00103 ***/
00104 
00105 /*!
00106  * \par Playing back a file to a channel in a conference
00107  * You might notice in this application that while playing a sound file
00108  * to a channel the actual conference bridge lock is not held. This is done so
00109  * that other channels are not blocked from interacting with the conference bridge.
00110  * Unfortunately because of this it is possible for things to change after the sound file
00111  * is done being played. Data must therefore be checked after reacquiring the conference
00112  * bridge lock if it is important.
00113  */
00114 
00115 static const char app[] = "ConfBridge";
00116 
00117 enum {
00118    OPTION_ADMIN = (1 << 0),             /*!< Set if the caller is an administrator */
00119    OPTION_MENU = (1 << 1),              /*!< Set if the caller should have access to the conference bridge IVR menu */
00120    OPTION_MUSICONHOLD = (1 << 2),       /*!< Set if music on hold should be played if nobody else is in the conference bridge */
00121    OPTION_NOONLYPERSON = (1 << 3),      /*!< Set if the "you are currently the only person in this conference" sound file should not be played */
00122    OPTION_STARTMUTED = (1 << 4),        /*!< Set if the caller should be initially set muted */
00123    OPTION_ANNOUNCEUSERCOUNT = (1 << 5), /*!< Set if the number of users should be announced to the caller */
00124    OPTION_MARKEDUSER = (1 << 6),        /*!< Set if the caller is a marked user */
00125    OPTION_WAITMARKED = (1 << 7),        /*!< Set if the conference must wait for a marked user before starting */
00126    OPTION_QUIET = (1 << 8),             /*!< Set if no audio prompts should be played */
00127 };
00128 
00129 enum {
00130    OPTION_MUSICONHOLD_CLASS,            /*!< If the 'M' option is set, the music on hold class to play */
00131    /*This must be the last element */
00132    OPTION_ARRAY_SIZE,
00133 };
00134 
00135 AST_APP_OPTIONS(app_opts,{
00136    AST_APP_OPTION('A', OPTION_MARKEDUSER),
00137    AST_APP_OPTION('a', OPTION_ADMIN),
00138    AST_APP_OPTION('c', OPTION_ANNOUNCEUSERCOUNT),
00139    AST_APP_OPTION('m', OPTION_STARTMUTED),
00140    AST_APP_OPTION_ARG('M', OPTION_MUSICONHOLD, OPTION_MUSICONHOLD_CLASS),
00141    AST_APP_OPTION('1', OPTION_NOONLYPERSON),
00142    AST_APP_OPTION('s', OPTION_MENU),
00143    AST_APP_OPTION('w', OPTION_WAITMARKED),
00144    AST_APP_OPTION('q', OPTION_QUIET),
00145 });
00146 
00147 /* Maximum length of a conference bridge name */
00148 #define MAX_CONF_NAME 32
00149 
00150 /* Number of buckets our conference bridges container can have */
00151 #define CONFERENCE_BRIDGE_BUCKETS 53
00152 
00153 /*! \brief The structure that represents a conference bridge */
00154 struct conference_bridge {
00155    char name[MAX_CONF_NAME];                                         /*!< Name of the conference bridge */
00156    struct ast_bridge *bridge;                                        /*!< Bridge structure doing the mixing */
00157    unsigned int users;                                               /*!< Number of users present */
00158    unsigned int markedusers;                                         /*!< Number of marked users present */
00159    unsigned int locked:1;                                            /*!< Is this conference bridge locked? */
00160    AST_LIST_HEAD_NOLOCK(, conference_bridge_user) users_list;        /*!< List of users participating in the conference bridge */
00161    struct ast_channel *playback_chan;                                /*!< Channel used for playback into the conference bridge */
00162    ast_mutex_t playback_lock;                                        /*!< Lock used for playback channel */
00163 };
00164 
00165 /*! \brief The structure that represents a conference bridge user */
00166 struct conference_bridge_user {
00167    struct conference_bridge *conference_bridge; /*!< Conference bridge they are participating in */
00168    struct ast_channel *chan;                    /*!< Asterisk channel participating */
00169    struct ast_flags flags;                      /*!< Flags passed in when the application was called */
00170    char *opt_args[OPTION_ARRAY_SIZE];           /*!< Arguments to options passed when application was called */
00171    struct ast_bridge_features features;         /*!< Bridge features structure */
00172    unsigned int kicked:1;                       /*!< User has been kicked from the conference */
00173    AST_LIST_ENTRY(conference_bridge_user) list; /*!< Linked list information */
00174 };
00175 
00176 /*! \brief Container to hold all conference bridges in progress */
00177 static struct ao2_container *conference_bridges;
00178 
00179 static int play_sound_file(struct conference_bridge *conference_bridge, const char *filename);
00180 
00181 /*! \brief Hashing function used for conference bridges container */
00182 static int conference_bridge_hash_cb(const void *obj, const int flags)
00183 {
00184    const struct conference_bridge *conference_bridge = obj;
00185    return ast_str_case_hash(conference_bridge->name);
00186 }
00187 
00188 /*! \brief Comparison function used for conference bridges container */
00189 static int conference_bridge_cmp_cb(void *obj, void *arg, int flags)
00190 {
00191    const struct conference_bridge *conference_bridge0 = obj, *conference_bridge1 = arg;
00192    return (!strcasecmp(conference_bridge0->name, conference_bridge1->name) ? CMP_MATCH | CMP_STOP : 0);
00193 }
00194 
00195 /*!
00196  * \brief Announce number of users in the conference bridge to the caller
00197  *
00198  * \param conference_bridge Conference bridge to peek at
00199  * \param conference_bridge_user Caller
00200  *
00201  * \return Returns nothing
00202  */
00203 static void announce_user_count(struct conference_bridge *conference_bridge, struct conference_bridge_user *conference_bridge_user)
00204 {
00205    if (conference_bridge->users == 1) {
00206       /* Awww we are the only person in the conference bridge */
00207       return;
00208    } else if (conference_bridge->users == 2) {
00209       /* Eep, there is one other person */
00210       if (ast_stream_and_wait(conference_bridge_user->chan, "conf-onlyone", "")) {
00211          return;
00212       }
00213    } else {
00214       /* Alas multiple others in here */
00215       if (ast_stream_and_wait(conference_bridge_user->chan, "conf-thereare", "")) {
00216          return;
00217       }
00218       if (ast_say_number(conference_bridge_user->chan, conference_bridge->users - 1, "", conference_bridge_user->chan->language, NULL)) {
00219          return;
00220       }
00221       if (ast_stream_and_wait(conference_bridge_user->chan, "conf-otherinparty", "")) {
00222          return;
00223       }
00224    }
00225 }
00226 
00227 /*!
00228  * \brief Play back an audio file to a channel
00229  *
00230  * \param conference_bridge Conference bridge they are in
00231  * \param chan Channel to play audio prompt to
00232  * \param file Prompt to play
00233  *
00234  * \return Returns nothing
00235  *
00236  * \note This function assumes that conference_bridge is locked
00237  */
00238 static void play_prompt_to_channel(struct conference_bridge *conference_bridge, struct ast_channel *chan, const char *file)
00239 {
00240    ao2_unlock(conference_bridge);
00241    ast_stream_and_wait(chan, file, "");
00242    ao2_lock(conference_bridge);
00243 }
00244 
00245 /*!
00246  * \brief Perform post-joining marked specific actions
00247  *
00248  * \param conference_bridge Conference bridge being joined
00249  * \param conference_bridge_user Conference bridge user joining
00250  *
00251  * \return Returns nothing
00252  */
00253 static void post_join_marked(struct conference_bridge *conference_bridge, struct conference_bridge_user *conference_bridge_user)
00254 {
00255    if (ast_test_flag(&conference_bridge_user->flags, OPTION_MARKEDUSER)) {
00256       struct conference_bridge_user *other_conference_bridge_user = NULL;
00257 
00258       /* If we are not the first marked user to join just bail out now */
00259       if (conference_bridge->markedusers >= 2) {
00260          return;
00261       }
00262 
00263       /* Iterate through every participant stopping MOH on them if need be */
00264       AST_LIST_TRAVERSE(&conference_bridge->users_list, other_conference_bridge_user, list) {
00265          if (other_conference_bridge_user == conference_bridge_user) {
00266             continue;
00267          }
00268          if (ast_test_flag(&other_conference_bridge_user->flags, OPTION_MUSICONHOLD) && !ast_bridge_suspend(conference_bridge->bridge, other_conference_bridge_user->chan)) {
00269             ast_moh_stop(other_conference_bridge_user->chan);
00270             ast_bridge_unsuspend(conference_bridge->bridge, other_conference_bridge_user->chan);
00271          }
00272       }
00273 
00274       /* Next play the audio file stating they are going to be placed into the conference */
00275       if (!ast_test_flag(&conference_bridge_user->flags, OPTION_QUIET)) {
00276          ao2_unlock(conference_bridge);
00277          ast_autoservice_start(conference_bridge_user->chan);
00278          play_sound_file(conference_bridge, "conf-placeintoconf");
00279          ast_autoservice_stop(conference_bridge_user->chan);
00280          ao2_lock(conference_bridge);
00281       }
00282 
00283       /* Finally iterate through and unmute them all */
00284       AST_LIST_TRAVERSE(&conference_bridge->users_list, other_conference_bridge_user, list) {
00285          if (other_conference_bridge_user == conference_bridge_user) {
00286             continue;
00287          }
00288          other_conference_bridge_user->features.mute = 0;
00289       }
00290 
00291    } else {
00292       /* If a marked user already exists in the conference bridge we can just bail out now */
00293       if (conference_bridge->markedusers) {
00294          return;
00295       }
00296       /* Be sure we are muted so we can't talk to anybody else waiting */
00297       conference_bridge_user->features.mute = 1;
00298       /* If we have not been quieted play back that they are waiting for the leader */
00299       if (!ast_test_flag(&conference_bridge_user->flags, OPTION_QUIET)) {
00300          play_prompt_to_channel(conference_bridge, conference_bridge_user->chan, "conf-waitforleader");
00301       }
00302       /* Start music on hold if needed */
00303       /* We need to recheck the markedusers value here. play_prompt_to_channel unlocks the conference bridge, potentially
00304        * allowing a marked user to enter while the prompt was playing
00305        */
00306       if (!conference_bridge->markedusers && ast_test_flag(&conference_bridge_user->flags, OPTION_MUSICONHOLD)) {
00307          ast_moh_start(conference_bridge_user->chan, conference_bridge_user->opt_args[OPTION_MUSICONHOLD_CLASS], NULL);
00308       }
00309    }
00310 }
00311 
00312 /*!
00313  * \brief Perform post-joining non-marked specific actions
00314  *
00315  * \param conference_bridge Conference bridge being joined
00316  * \param conference_bridge_user Conference bridge user joining
00317  *
00318  * \return Returns nothing
00319  */
00320 static void post_join_unmarked(struct conference_bridge *conference_bridge, struct conference_bridge_user *conference_bridge_user)
00321 {
00322    /* Play back audio prompt and start MOH if need be if we are the first participant */
00323    if (conference_bridge->users == 1) {
00324       /* If audio prompts have not been quieted or this prompt quieted play it on out */
00325       if (!ast_test_flag(&conference_bridge_user->flags, OPTION_QUIET | OPTION_NOONLYPERSON)) {
00326          play_prompt_to_channel(conference_bridge, conference_bridge_user->chan, "conf-onlyperson");
00327       }
00328       /* If we need to start music on hold on the channel do so now */
00329       /* We need to re-check the number of users in the conference bridge here because another conference bridge
00330        * participant could have joined while the above prompt was playing for the first user.
00331        */
00332       if (conference_bridge->users == 1 && ast_test_flag(&conference_bridge_user->flags, OPTION_MUSICONHOLD)) {
00333          ast_moh_start(conference_bridge_user->chan, conference_bridge_user->opt_args[OPTION_MUSICONHOLD_CLASS], NULL);
00334       }
00335       return;
00336    }
00337 
00338    /* Announce number of users if need be */
00339    if (ast_test_flag(&conference_bridge_user->flags, OPTION_ANNOUNCEUSERCOUNT)) {
00340       ao2_unlock(conference_bridge);
00341       announce_user_count(conference_bridge, conference_bridge_user);
00342       ao2_lock(conference_bridge);
00343    }
00344 
00345    /* If we are the second participant we may need to stop music on hold on the first */
00346    if (conference_bridge->users == 2) {
00347       struct conference_bridge_user *first_participant = AST_LIST_FIRST(&conference_bridge->users_list);
00348 
00349       /* Temporarily suspend the above participant from the bridge so we have control to stop MOH if needed */
00350       if (ast_test_flag(&first_participant->flags, OPTION_MUSICONHOLD) && !ast_bridge_suspend(conference_bridge->bridge, first_participant->chan)) {
00351          ast_moh_stop(first_participant->chan);
00352          ast_bridge_unsuspend(conference_bridge->bridge, first_participant->chan);
00353       }
00354    }
00355 }
00356 
00357 /*!
00358  * \brief Destroy a conference bridge
00359  *
00360  * \param obj The conference bridge object
00361  *
00362  * \return Returns nothing
00363  */
00364 static void destroy_conference_bridge(void *obj)
00365 {
00366    struct conference_bridge *conference_bridge = obj;
00367 
00368    ast_debug(1, "Destroying conference bridge '%s'\n", conference_bridge->name);
00369 
00370    ast_mutex_destroy(&conference_bridge->playback_lock);
00371 
00372    if (conference_bridge->playback_chan) {
00373       struct ast_channel *underlying_channel = conference_bridge->playback_chan->tech->bridged_channel(conference_bridge->playback_chan, NULL);
00374       ast_hangup(underlying_channel);
00375       ast_hangup(conference_bridge->playback_chan);
00376       conference_bridge->playback_chan = NULL;
00377    }
00378 
00379    /* Destroying a conference bridge is simple, all we have to do is destroy the bridging object */
00380    if (conference_bridge->bridge) {
00381       ast_bridge_destroy(conference_bridge->bridge);
00382       conference_bridge->bridge = NULL;
00383    }
00384 }
00385 
00386 /*!
00387  * \brief Join a conference bridge
00388  *
00389  * \param name The conference name
00390  * \param conference_bridge_user Conference bridge user structure
00391  *
00392  * \return A pointer to the conference bridge struct, or NULL if the conference room wasn't found.
00393  */
00394 static struct conference_bridge *join_conference_bridge(const char *name, struct conference_bridge_user *conference_bridge_user)
00395 {
00396    struct conference_bridge *conference_bridge = NULL;
00397    struct conference_bridge tmp;
00398 
00399    ast_copy_string(tmp.name, name, sizeof(tmp.name));
00400 
00401    /* We explictly lock the conference bridges container ourselves so that other callers can not create duplicate conferences at the same */
00402    ao2_lock(conference_bridges);
00403 
00404    ast_debug(1, "Trying to find conference bridge '%s'\n", name);
00405 
00406    /* Attempt to find an existing conference bridge */
00407    conference_bridge = ao2_find(conference_bridges, &tmp, OBJ_POINTER);
00408 
00409    /* When finding a conference bridge that already exists make sure that it is not locked, and if so that we are not an admin */
00410    if (conference_bridge && conference_bridge->locked && !ast_test_flag(&conference_bridge_user->flags, OPTION_ADMIN)) {
00411       ao2_unlock(conference_bridges);
00412       ao2_ref(conference_bridge, -1);
00413       ast_debug(1, "Conference bridge '%s' is locked and caller is not an admin\n", name);
00414       ast_stream_and_wait(conference_bridge_user->chan, "conf-locked", "");
00415       return NULL;
00416    }
00417 
00418    /* If no conference bridge was found see if we can create one */
00419    if (!conference_bridge) {
00420       /* Try to allocate memory for a new conference bridge, if we fail... this won't end well. */
00421       if (!(conference_bridge = ao2_alloc(sizeof(*conference_bridge), destroy_conference_bridge))) {
00422          ao2_unlock(conference_bridges);
00423          ast_log(LOG_ERROR, "Conference bridge '%s' does not exist.\n", name);
00424          return NULL;
00425       }
00426 
00427       /* Setup conference bridge parameters */
00428       ast_copy_string(conference_bridge->name, name, sizeof(conference_bridge->name));
00429 
00430       /* Create an actual bridge that will do the audio mixing */
00431       if (!(conference_bridge->bridge = ast_bridge_new(AST_BRIDGE_CAPABILITY_1TO1MIX, AST_BRIDGE_FLAG_SMART))) {
00432          ao2_ref(conference_bridge, -1);
00433          conference_bridge = NULL;
00434          ao2_unlock(conference_bridges);
00435          ast_log(LOG_ERROR, "Conference bridge '%s' could not be created.\n", name);
00436          return NULL;
00437       }
00438 
00439       /* Setup lock for playback channel */
00440       ast_mutex_init(&conference_bridge->playback_lock);
00441 
00442       /* Link it into the conference bridges container */
00443       ao2_link(conference_bridges, conference_bridge);
00444 
00445       ast_debug(1, "Created conference bridge '%s' and linked to container '%p'\n", name, conference_bridges);
00446    }
00447 
00448    ao2_unlock(conference_bridges);
00449 
00450    /* Setup conference bridge user parameters */
00451    conference_bridge_user->conference_bridge = conference_bridge;
00452 
00453    ao2_lock(conference_bridge);
00454 
00455    /* All good to go, add them in */
00456    AST_LIST_INSERT_TAIL(&conference_bridge->users_list, conference_bridge_user, list);
00457 
00458    /* Increment the users count on the bridge, but record it as it is going to need to be known right after this */
00459    conference_bridge->users++;
00460 
00461    /* If the caller is a marked user bump up the count */
00462    if (ast_test_flag(&conference_bridge_user->flags, OPTION_MARKEDUSER)) {
00463       conference_bridge->markedusers++;
00464    }
00465 
00466    /* Set the device state for this conference */
00467    if (conference_bridge->users == 1) {
00468       ast_devstate_changed(AST_DEVICE_INUSE, "confbridge:%s", conference_bridge->name);
00469    }
00470 
00471    /* If the caller is a marked user or is waiting for a marked user to enter pass 'em off, otherwise pass them off to do regular joining stuff */
00472    if (ast_test_flag(&conference_bridge_user->flags, OPTION_MARKEDUSER | OPTION_WAITMARKED)) {
00473       post_join_marked(conference_bridge, conference_bridge_user);
00474    } else {
00475       post_join_unmarked(conference_bridge, conference_bridge_user);
00476    }
00477 
00478    ao2_unlock(conference_bridge);
00479 
00480    return conference_bridge;
00481 }
00482 
00483 /*!
00484  * \brief Leave a conference bridge
00485  *
00486  * \param conference_bridge The conference bridge to leave
00487  * \param conference_bridge_user The conference bridge user structure
00488  *
00489  */
00490 static void  leave_conference_bridge(struct conference_bridge *conference_bridge, struct conference_bridge_user *conference_bridge_user)
00491 {
00492    ao2_lock(conference_bridge);
00493 
00494    /* If this caller is a marked user bump down the count */
00495    if (ast_test_flag(&conference_bridge_user->flags, OPTION_MARKEDUSER)) {
00496       conference_bridge->markedusers--;
00497    }
00498 
00499    /* Decrement the users count while keeping the previous participant count */
00500    conference_bridge->users--;
00501 
00502    /* Drop conference bridge user from the list, they be going bye bye */
00503    AST_LIST_REMOVE(&conference_bridge->users_list, conference_bridge_user, list);
00504 
00505    /* If there are still users in the conference bridge we may need to do things (such as start MOH on them) */
00506    if (conference_bridge->users) {
00507       if (ast_test_flag(&conference_bridge_user->flags, OPTION_MARKEDUSER) && !conference_bridge->markedusers) {
00508          struct conference_bridge_user *other_participant = NULL;
00509 
00510          /* Start out with muting everyone */
00511          AST_LIST_TRAVERSE(&conference_bridge->users_list, other_participant, list) {
00512             other_participant->features.mute = 1;
00513          }
00514 
00515          /* Play back the audio prompt saying the leader has left the conference */
00516          if (!ast_test_flag(&conference_bridge_user->flags, OPTION_QUIET)) {
00517             ao2_unlock(conference_bridge);
00518             ast_autoservice_start(conference_bridge_user->chan);
00519             play_sound_file(conference_bridge, "conf-leaderhasleft");
00520             ast_autoservice_stop(conference_bridge_user->chan);
00521             ao2_lock(conference_bridge);
00522          }
00523 
00524          /* Now on to starting MOH if needed */
00525          AST_LIST_TRAVERSE(&conference_bridge->users_list, other_participant, list) {
00526             if (ast_test_flag(&other_participant->flags, OPTION_MUSICONHOLD) && !ast_bridge_suspend(conference_bridge->bridge, other_participant->chan)) {
00527                ast_moh_start(other_participant->chan, other_participant->opt_args[OPTION_MUSICONHOLD_CLASS], NULL);
00528                ast_bridge_unsuspend(conference_bridge->bridge, other_participant->chan);
00529             }
00530          }
00531       } else if (conference_bridge->users == 1) {
00532          /* Of course if there is one other person in here we may need to start up MOH on them */
00533          struct conference_bridge_user *first_participant = AST_LIST_FIRST(&conference_bridge->users_list);
00534 
00535          if (ast_test_flag(&first_participant->flags, OPTION_MUSICONHOLD) && !ast_bridge_suspend(conference_bridge->bridge, first_participant->chan)) {
00536             ast_moh_start(first_participant->chan, first_participant->opt_args[OPTION_MUSICONHOLD_CLASS], NULL);
00537             ast_bridge_unsuspend(conference_bridge->bridge, first_participant->chan);
00538          }
00539       }
00540    } else {
00541       /* Set device state to "not in use" */
00542       ast_devstate_changed(AST_DEVICE_NOT_INUSE, "confbridge:%s", conference_bridge->name);
00543 
00544       ao2_unlink(conference_bridges, conference_bridge);
00545    }
00546 
00547    /* Done mucking with the conference bridge, huzzah */
00548    ao2_unlock(conference_bridge);
00549 
00550    ao2_ref(conference_bridge, -1);
00551 }
00552 
00553 /*!
00554  * \brief Play sound file into conference bridge
00555  *
00556  * \param conference_bridge The conference bridge to play sound file into
00557  * \param filename Sound file to play
00558  *
00559  * \retval 0 success
00560  * \retval -1 failure
00561  */
00562 static int play_sound_file(struct conference_bridge *conference_bridge, const char *filename)
00563 {
00564    struct ast_channel *underlying_channel;
00565 
00566    ast_mutex_lock(&conference_bridge->playback_lock);
00567 
00568    if (!(conference_bridge->playback_chan)) {
00569       int cause;
00570 
00571       if (!(conference_bridge->playback_chan = ast_request("Bridge", AST_FORMAT_SLINEAR, NULL, "", &cause))) {
00572          ast_mutex_unlock(&conference_bridge->playback_lock);
00573          return -1;
00574       }
00575 
00576       conference_bridge->playback_chan->bridge = conference_bridge->bridge;
00577 
00578       if (ast_call(conference_bridge->playback_chan, "", 0)) {
00579          ast_hangup(conference_bridge->playback_chan);
00580          conference_bridge->playback_chan = NULL;
00581          ast_mutex_unlock(&conference_bridge->playback_lock);
00582          return -1;
00583       }
00584 
00585       ast_debug(1, "Created a playback channel to conference bridge '%s'\n", conference_bridge->name);
00586 
00587       underlying_channel = conference_bridge->playback_chan->tech->bridged_channel(conference_bridge->playback_chan, NULL);
00588    } else {
00589       /* Channel was already available so we just need to add it back into the bridge */
00590       underlying_channel = conference_bridge->playback_chan->tech->bridged_channel(conference_bridge->playback_chan, NULL);
00591       ast_bridge_impart(conference_bridge->bridge, underlying_channel, NULL, NULL);
00592    }
00593 
00594    /* The channel is all under our control, in goes the prompt */
00595    ast_stream_and_wait(conference_bridge->playback_chan, filename, "");
00596 
00597    ast_debug(1, "Departing underlying channel '%s' from bridge '%p'\n", underlying_channel->name, conference_bridge->bridge);
00598    ast_bridge_depart(conference_bridge->bridge, underlying_channel);
00599 
00600    ast_mutex_unlock(&conference_bridge->playback_lock);
00601 
00602    return 0;
00603 }
00604 
00605 /*!
00606  * \brief DTMF Menu Callback
00607  *
00608  * \param bridge Bridge this is involving
00609  * \param bridge_channel Bridged channel this is involving
00610  * \param hook_pvt User's conference bridge structure
00611  *
00612  * \retval 0 success
00613  * \retval -1 failure
00614  */
00615 static int menu_callback(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel, void *hook_pvt)
00616 {
00617    struct conference_bridge_user *conference_bridge_user = hook_pvt;
00618    struct conference_bridge *conference_bridge = conference_bridge_user->conference_bridge;
00619    int digit, res = 0, isadmin = ast_test_flag(&conference_bridge_user->flags, OPTION_ADMIN);
00620 
00621    /* See if music on hold is playing */
00622    ao2_lock(conference_bridge);
00623    if (conference_bridge->users == 1 && ast_test_flag(&conference_bridge_user->flags, OPTION_MUSICONHOLD)) {
00624       /* Just us so MOH is probably indeed going, let's stop it */
00625       ast_moh_stop(bridge_channel->chan);
00626    }
00627    ao2_unlock(conference_bridge);
00628 
00629    /* Try to play back the user menu, if it fails pass this back up so the bridging core will act on it */
00630    if (ast_streamfile(bridge_channel->chan, (isadmin ? "conf-adminmenu" : "conf-usermenu"), bridge_channel->chan->language)) {
00631       res = -1;
00632       goto finished;
00633    }
00634 
00635    /* Wait for them to enter a digit from the user menu options */
00636    digit = ast_waitstream(bridge_channel->chan, AST_DIGIT_ANY);
00637    ast_stopstream(bridge_channel->chan);
00638 
00639    if (digit == '1') {
00640       /* 1 - Mute or unmute yourself, note we only allow manipulation if they aren't waiting for a marked user or if marked users exist */
00641       if (!ast_test_flag(&conference_bridge_user->flags, OPTION_WAITMARKED) || conference_bridge->markedusers) {
00642          conference_bridge_user->features.mute = (!conference_bridge_user->features.mute ? 1 : 0);
00643       }
00644       res = ast_stream_and_wait(bridge_channel->chan, (conference_bridge_user->features.mute ? "conf-muted" : "conf-unmuted"), "");
00645    } else if (isadmin && digit == '2') {
00646       /* 2 - Unlock or lock conference */
00647       conference_bridge->locked = (!conference_bridge->locked ? 1 : 0);
00648       res = ast_stream_and_wait(bridge_channel->chan, (conference_bridge->locked ? "conf-lockednow" : "conf-unlockednow"), "");
00649    } else if (isadmin && digit == '3') {
00650       /* 3 - Eject last user */
00651       struct conference_bridge_user *last_participant = NULL;
00652 
00653       ao2_lock(conference_bridge);
00654       if (((last_participant = AST_LIST_LAST(&conference_bridge->users_list)) == conference_bridge_user) || (ast_test_flag(&last_participant->flags, OPTION_ADMIN))) {
00655          ao2_unlock(conference_bridge);
00656          res = ast_stream_and_wait(bridge_channel->chan, "conf-errormenu", "");
00657       } else {
00658          last_participant->kicked = 1;
00659          ast_bridge_remove(conference_bridge->bridge, last_participant->chan);
00660          ao2_unlock(conference_bridge);
00661       }
00662    } else if (digit == '4') {
00663       /* 4 - Decrease listening volume */
00664       ast_audiohook_volume_adjust(conference_bridge_user->chan, AST_AUDIOHOOK_DIRECTION_WRITE, -1);
00665    } else if (digit == '6') {
00666       /* 6 - Increase listening volume */
00667       ast_audiohook_volume_adjust(conference_bridge_user->chan, AST_AUDIOHOOK_DIRECTION_WRITE, 1);
00668    } else if (digit == '7') {
00669       /* 7 - Decrease talking volume */
00670       ast_audiohook_volume_adjust(conference_bridge_user->chan, AST_AUDIOHOOK_DIRECTION_READ, -1);
00671    } else if (digit == '8') {
00672       /* 8 - Exit the IVR */
00673    } else if (digit == '9') {
00674       /* 9 - Increase talking volume */
00675       ast_audiohook_volume_adjust(conference_bridge_user->chan, AST_AUDIOHOOK_DIRECTION_READ, 1);
00676    } else {
00677       /* No valid option was selected */
00678       res = ast_stream_and_wait(bridge_channel->chan, "conf-errormenu", "");
00679    }
00680 
00681  finished:
00682    /* See if music on hold needs to be started back up again */
00683    ao2_lock(conference_bridge);
00684    if (conference_bridge->users == 1 && ast_test_flag(&conference_bridge_user->flags, OPTION_MUSICONHOLD)) {
00685       ast_moh_start(bridge_channel->chan, conference_bridge_user->opt_args[OPTION_MUSICONHOLD_CLASS], NULL);
00686    }
00687    ao2_unlock(conference_bridge);
00688 
00689    bridge_channel->state = AST_BRIDGE_CHANNEL_STATE_WAIT;
00690 
00691    return res;
00692 }
00693 
00694 /*! \brief The ConfBridge application */
00695 static int confbridge_exec(struct ast_channel *chan, const char *data)
00696 {
00697    int res = 0, volume_adjustments[2];
00698    char *parse;
00699    struct conference_bridge *conference_bridge = NULL;
00700    struct conference_bridge_user conference_bridge_user = {
00701       .chan = chan,
00702    };
00703    const char *tmp, *join_sound = NULL, *leave_sound = NULL;
00704    AST_DECLARE_APP_ARGS(args,
00705       AST_APP_ARG(conf_name);
00706       AST_APP_ARG(options);
00707    );
00708 
00709    if (ast_strlen_zero(data)) {
00710       ast_log(LOG_WARNING, "%s requires an argument (conference name[,options])\n", app);
00711       return -1;
00712    }
00713 
00714    /* We need to make a copy of the input string if we are going to modify it! */
00715    parse = ast_strdupa(data);
00716 
00717    AST_STANDARD_APP_ARGS(args, parse);
00718 
00719    if (args.argc == 2) {
00720       ast_app_parse_options(app_opts, &conference_bridge_user.flags, conference_bridge_user.opt_args, args.options);
00721    }
00722 
00723    /* Look for a conference bridge matching the provided name */
00724    if (!(conference_bridge = join_conference_bridge(args.conf_name, &conference_bridge_user))) {
00725       return -1;
00726    }
00727 
00728    /* Keep a copy of volume adjustments so we can restore them later if need be */
00729    volume_adjustments[0] = ast_audiohook_volume_get(chan, AST_AUDIOHOOK_DIRECTION_READ);
00730    volume_adjustments[1] = ast_audiohook_volume_get(chan, AST_AUDIOHOOK_DIRECTION_WRITE);
00731 
00732    /* Always initialize the features structure, we are in most cases always going to need it. */
00733    ast_bridge_features_init(&conference_bridge_user.features);
00734 
00735    /* If the menu option is enabled provide a user or admin menu as a custom feature hook */
00736    if (ast_test_flag(&conference_bridge_user.flags, OPTION_MENU)) {
00737       ast_bridge_features_hook(&conference_bridge_user.features, "#", menu_callback, &conference_bridge_user);
00738    }
00739 
00740    /* If the caller should be joined already muted, make it so */
00741    if (ast_test_flag(&conference_bridge_user.flags, OPTION_STARTMUTED)) {
00742       conference_bridge_user.features.mute = 1;
00743    }
00744 
00745    /* Grab join/leave sounds from the channel */
00746    ast_channel_lock(chan);
00747    if ((tmp = pbx_builtin_getvar_helper(chan, "CONFBRIDGE_JOIN_SOUND"))) {
00748       join_sound = ast_strdupa(tmp);
00749    }
00750    if ((tmp = pbx_builtin_getvar_helper(chan, "CONFBRIDGE_LEAVE_SOUND"))) {
00751       leave_sound = ast_strdupa(tmp);
00752    }
00753    ast_channel_unlock(chan);
00754 
00755    /* If there is 1 or more people already in the conference then play our join sound unless overridden */
00756    if (!ast_test_flag(&conference_bridge_user.flags, OPTION_QUIET) && !ast_strlen_zero(join_sound) && conference_bridge->users >= 2) {
00757       ast_autoservice_start(chan);
00758       play_sound_file(conference_bridge, join_sound);
00759       ast_autoservice_stop(chan);
00760    }
00761 
00762    /* Join our conference bridge for real */
00763    ast_bridge_join(conference_bridge->bridge, chan, NULL, &conference_bridge_user.features);
00764 
00765    /* If there is 1 or more people (not including us) already in the conference then play our leave sound unless overridden */
00766    if (!ast_test_flag(&conference_bridge_user.flags, OPTION_QUIET) && !ast_strlen_zero(leave_sound) && conference_bridge->users >= 2) {
00767       ast_autoservice_start(chan);
00768       play_sound_file(conference_bridge, leave_sound);
00769       ast_autoservice_stop(chan);
00770    }
00771 
00772    /* Easy as pie, depart this channel from the conference bridge */
00773    leave_conference_bridge(conference_bridge, &conference_bridge_user);
00774    conference_bridge = NULL;
00775 
00776    /* Can't forget to clean up the features structure, or else we risk a memory leak */
00777    ast_bridge_features_cleanup(&conference_bridge_user.features);
00778 
00779    /* If the user was kicked from the conference play back the audio prompt for it */
00780    if (!ast_test_flag(&conference_bridge_user.flags, OPTION_QUIET) && conference_bridge_user.kicked) {
00781       res = ast_stream_and_wait(chan, "conf-kicked", "");
00782    }
00783 
00784    /* Restore volume adjustments to previous values in case they were changed */
00785    if (volume_adjustments[0]) {
00786       ast_audiohook_volume_set(chan, AST_AUDIOHOOK_DIRECTION_READ, volume_adjustments[0]);
00787    }
00788    if (volume_adjustments[1]) {
00789       ast_audiohook_volume_set(chan, AST_AUDIOHOOK_DIRECTION_WRITE, volume_adjustments[1]);
00790    }
00791 
00792    return res;
00793 }
00794 
00795 /*! \brief Called when module is being unloaded */
00796 static int unload_module(void)
00797 {
00798    int res = ast_unregister_application(app);
00799 
00800    /* Get rid of the conference bridges container. Since we only allow dynamic ones none will be active. */
00801    ao2_ref(conference_bridges, -1);
00802 
00803    return res;
00804 }
00805 
00806 /*! \brief Called when module is being loaded */
00807 static int load_module(void)
00808 {
00809    /* Create a container to hold the conference bridges */
00810    if (!(conference_bridges = ao2_container_alloc(CONFERENCE_BRIDGE_BUCKETS, conference_bridge_hash_cb, conference_bridge_cmp_cb))) {
00811       return AST_MODULE_LOAD_DECLINE;
00812    }
00813 
00814    if (ast_register_application_xml(app, confbridge_exec)) {
00815       ao2_ref(conference_bridges, -1);
00816       return AST_MODULE_LOAD_DECLINE;
00817    }
00818 
00819    return AST_MODULE_LOAD_SUCCESS;
00820 }
00821 
00822 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "Conference Bridge Application",
00823    .load = load_module,
00824    .unload = unload_module,
00825    .load_pri = AST_MODPRI_DEVSTATE_PROVIDER,
00826 );

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