conf_chan_announce.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 2013 Digium, Inc.
 *
 * Richard Mudgett <rmudgett@digium.com>
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */
 
/*!
 * \file
 * \brief ConfBridge announcer channel driver
 *
 * \author Richard Mudgett <rmudgett@digium.com>
 *
 * See Also:
 * \arg \ref AstCREDITS
 */
 
 
#include "asterisk.h"
 
#include "asterisk/channel.h"
#include "asterisk/bridge.h"
#include "asterisk/core_unreal.h"
#include "include/confbridge.h"
 
/* ------------------------------------------------------------------- */
 
/*! ConfBridge announcer channel private. */
struct announce_pvt {
    /*! Unreal channel driver base class values. */
    struct ast_unreal_pvt base;
    /*! Conference bridge associated with this announcer. */
    struct ast_bridge *bridge;
};
 
static int announce_call(struct ast_channel *chan, const char *addr, int timeout)
{
    /* Make sure anyone calling ast_call() for this channel driver is going to fail. */
    return -1;
}
 
static int announce_hangup(struct ast_channel *ast)
{
    struct announce_pvt *p = ast_channel_tech_pvt(ast);
    int res;
 
    if (!p) {
        return -1;
    }
 
    /* give the pvt a ref to fulfill calling requirements. */
    ao2_ref(p, +1);
    res = ast_unreal_hangup(&p->base, ast);
    ao2_ref(p, -1);
 
    return res;
}
 
static void announce_pvt_destructor(void *vdoomed)
{
    struct announce_pvt *doomed = vdoomed;
 
    ao2_cleanup(doomed->bridge);
    doomed->bridge = NULL;
    ast_unreal_destructor(&doomed->base);
}
 
static struct ast_channel *announce_request(const char *type, struct ast_format_cap *cap, const struct ast_assigned_ids *assignedids, const struct ast_channel *requestor, const char *data, int *cause)
{
    struct ast_channel *chan;
    const char *conf_name = data;
    RAII_VAR(struct confbridge_conference *, conference, NULL, ao2_cleanup);
    RAII_VAR(struct announce_pvt *, pvt, NULL, ao2_cleanup);
 
    conference = ao2_find(conference_bridges, conf_name, OBJ_KEY);
    if (!conference) {
        return NULL;
    }
    ast_assert(conference->bridge != NULL);
 
    /* Allocate a new private structure and then Asterisk channels */
    pvt = (struct announce_pvt *) ast_unreal_alloc(sizeof(*pvt), announce_pvt_destructor,
        cap);
    if (!pvt) {
        return NULL;
    }
    ast_set_flag(&pvt->base, AST_UNREAL_NO_OPTIMIZATION);
    ast_copy_string(pvt->base.name, conf_name, sizeof(pvt->base.name));
    pvt->bridge = conference->bridge;
    ao2_ref(pvt->bridge, +1);
 
    chan = ast_unreal_new_channels(&pvt->base, conf_announce_get_tech(),
        AST_STATE_UP, AST_STATE_UP, NULL, NULL, assignedids, requestor, 0);
    if (chan) {
        ast_answer(pvt->base.owner);
        ast_answer(pvt->base.chan);
        if (ast_channel_add_bridge_role(pvt->base.chan, "announcer")) {
            ast_hangup(chan);
            chan = NULL;
        }
    }
 
    return chan;
}
 
static struct ast_channel_tech announce_tech = {
    .type = "CBAnn",
    .description = "Conference Bridge Announcing Channel",
    .requester = announce_request,
    .call = announce_call,
    .hangup = announce_hangup,
 
    .send_digit_begin = ast_unreal_digit_begin,
    .send_digit_end = ast_unreal_digit_end,
    .read = ast_unreal_read,
    .write = ast_unreal_write,
    .write_video = ast_unreal_write,
    .exception = ast_unreal_read,
    .indicate = ast_unreal_indicate,
    .fixup = ast_unreal_fixup,
    .send_html = ast_unreal_sendhtml,
    .send_text = ast_unreal_sendtext,
    .queryoption = ast_unreal_queryoption,
    .setoption = ast_unreal_setoption,
    .properties = AST_CHAN_TP_INTERNAL,
};
 
struct ast_channel_tech *conf_announce_get_tech(void)
{
    return &announce_tech;
}
 
int conf_announce_channel_push(struct ast_channel *ast)
{
    struct ast_bridge_features *features;
    struct ast_channel *chan;
    RAII_VAR(struct announce_pvt *, p, NULL, ao2_cleanup);
 
    {
        SCOPED_CHANNELLOCK(lock, ast);
 
        p = ast_channel_tech_pvt(ast);
        if (!p) {
            return -1;
        }
        ao2_ref(p, +1);
        chan = p->base.chan;
        if (!chan) {
            return -1;
        }
    }
 
    features = ast_bridge_features_new();
    if (!features) {
        return -1;
    }
    ast_set_flag(&features->feature_flags, AST_BRIDGE_CHANNEL_FLAG_IMMOVABLE);
 
    /* Impart the output channel into the bridge */
    if (ast_bridge_impart(p->bridge, chan, NULL, features,
        AST_BRIDGE_IMPART_CHAN_INDEPENDENT)) {
        return -1;
    }
    ao2_lock(p);
    ast_set_flag(&p->base, AST_UNREAL_CARETAKER_THREAD);
    ao2_unlock(p);
    return 0;
}