chan_bridge_media.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 2013 Digium, Inc.
 *
 * Jonathan Rose <jrose@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 Bridge Media Channels driver
 *
 * \author Jonathan Rose <jrose@digium.com>
 * \author Richard Mudgett <rmudgett@digium.com>
 *
 * \brief Bridge Media Channels
 *
 * \ingroup channel_drivers
 */
 
/*** MODULEINFO
    <support_level>core</support_level>
 ***/
 
#include "asterisk.h"
 
#include "asterisk/channel.h"
#include "asterisk/bridge.h"
#include "asterisk/core_unreal.h"
#include "asterisk/module.h"
 
static int media_call(struct ast_channel *chan, const char *addr, int timeout)
{
    /* ast_call() will fail unconditionally against channels provided by this driver */
    return -1;
}
 
static int media_hangup(struct ast_channel *ast)
{
    struct ast_unreal_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, ast);
    ao2_ref(p, -1);
 
    return res;
}
 
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);
 
static struct ast_channel *record_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);
 
static struct ast_channel_tech announce_tech = {
    .type = "Announcer",
    .description = "Bridge Media Announcing Channel Driver",
    .requester = announce_request,
    .call = media_call,
    .hangup = media_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,
};
 
static struct ast_channel_tech record_tech = {
    .type = "Recorder",
    .description = "Bridge Media Recording Channel Driver",
    .requester = record_request,
    .call = media_call,
    .hangup = media_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,
};
 
static struct ast_channel *media_request_helper(struct ast_format_cap *cap, const struct ast_assigned_ids *assignedids,
    const struct ast_channel *requestor, const char *data, struct ast_channel_tech *tech, const char *role)
{
    struct ast_channel *chan;
    ast_callid callid;
 
    RAII_VAR(struct ast_unreal_pvt *, pvt, NULL, ao2_cleanup);
 
    if (!(pvt = ast_unreal_alloc(sizeof(*pvt), ast_unreal_destructor, cap))) {
        return NULL;
    }
 
    ast_copy_string(pvt->name, data, sizeof(pvt->name));
 
    ast_set_flag(pvt, AST_UNREAL_NO_OPTIMIZATION);
 
    callid = ast_read_threadstorage_callid();
 
    chan = ast_unreal_new_channels(pvt, tech,
        AST_STATE_UP, AST_STATE_UP, NULL, NULL, assignedids, requestor, callid);
    if (!chan) {
        return NULL;
    }
 
    ast_answer(pvt->owner);
    ast_answer(pvt->chan);
 
    if (ast_channel_add_bridge_role(pvt->chan, role)) {
        ast_hangup(chan);
        return NULL;
    }
 
    return chan;
}
 
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)
{
    return media_request_helper(cap, assignedids, requestor, data, &announce_tech, "announcer");
}
 
static struct ast_channel *record_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)
{
    return media_request_helper(cap, assignedids, requestor, data, &record_tech, "recorder");
}
 
static void cleanup_capabilities(void)
{
    if (announce_tech.capabilities) {
        ao2_ref(announce_tech.capabilities, -1);
        announce_tech.capabilities = NULL;
    }
 
    if (record_tech.capabilities) {
        ao2_ref(record_tech.capabilities, -1);
        record_tech.capabilities = NULL;
    }
}
 
static int unload_module(void)
{
    ast_channel_unregister(&announce_tech);
    ast_channel_unregister(&record_tech);
    cleanup_capabilities();
    return 0;
}
 
static int load_module(void)
{
    announce_tech.capabilities = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT);
    if (!announce_tech.capabilities) {
        return AST_MODULE_LOAD_DECLINE;
    }
 
    record_tech.capabilities = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT);
    if (!record_tech.capabilities) {
        return AST_MODULE_LOAD_DECLINE;
    }
 
    ast_format_cap_append_by_type(announce_tech.capabilities, AST_MEDIA_TYPE_UNKNOWN);
    ast_format_cap_append_by_type(record_tech.capabilities, AST_MEDIA_TYPE_UNKNOWN);
 
    if (ast_channel_register(&announce_tech)) {
        ast_log(LOG_ERROR, "Unable to register channel technology %s(%s).\n",
            announce_tech.type, announce_tech.description);
        cleanup_capabilities();
        return AST_MODULE_LOAD_DECLINE;
    }
 
    if (ast_channel_register(&record_tech)) {
        ast_log(LOG_ERROR, "Unable to register channel technology %s(%s).\n",
            record_tech.type, record_tech.description);
        cleanup_capabilities();
        return AST_MODULE_LOAD_DECLINE;
    }
 
    return AST_MODULE_LOAD_SUCCESS;
}
 
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "Bridge Media Channel Driver",
    .support_level = AST_MODULE_SUPPORT_CORE,
    .load = load_module,
    .unload = unload_module,
);