Breaks many things until they can be reworked. A partial list: chan_agent chan_dahdi, chan_misdn, chan_iax2 native bridging app_queue COLP updates DTMF attended transfers Protocol attended transfers git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@389378 65c4cc65-6c06-0410-ace0-fbb531ad65f3
312 lines
9.4 KiB
C
312 lines
9.4 KiB
C
/*
|
|
* 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 Bridging technology for storing channels in a bridge for
|
|
* the purpose of holding, parking, queues, and other such
|
|
* states where a channel may need to be in a bridge but not
|
|
* actually communicating with anything.
|
|
*
|
|
* \author Jonathan Rose <jrose@digium.com>
|
|
*
|
|
* \ingroup bridges
|
|
*/
|
|
|
|
/*** MODULEINFO
|
|
<support_level>core</support_level>
|
|
***/
|
|
|
|
#include "asterisk.h"
|
|
|
|
ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
|
|
#include "asterisk/module.h"
|
|
#include "asterisk/channel.h"
|
|
#include "asterisk/bridging.h"
|
|
#include "asterisk/bridging_technology.h"
|
|
#include "asterisk/frame.h"
|
|
#include "asterisk/musiconhold.h"
|
|
|
|
enum role_flags {
|
|
HOLDING_ROLE_PARTICIPANT = (1 << 0),
|
|
HOLDING_ROLE_ANNOUNCER = (1 << 1),
|
|
};
|
|
|
|
/* BUGBUG Add IDLE_MODE_HOLD option to put channel on hold using AST_CONTROL_HOLD/AST_CONTROL_UNHOLD while in bridge */
|
|
/* BUGBUG Add IDLE_MODE_SILENCE to send silence media frames to channel while in bridge (uses a silence generator) */
|
|
/* BUGBUG A channel without the holding_participant role will assume IDLE_MODE_MOH with the default music class. */
|
|
enum idle_modes {
|
|
IDLE_MODE_NONE = 0,
|
|
IDLE_MODE_MOH,
|
|
IDLE_MODE_RINGING,
|
|
};
|
|
|
|
/*! \brief Structure which contains per-channel role information */
|
|
struct holding_channel {
|
|
struct ast_flags holding_roles;
|
|
enum idle_modes idle_mode;
|
|
};
|
|
|
|
static void participant_stop_hold_audio(struct ast_bridge_channel *bridge_channel)
|
|
{
|
|
struct holding_channel *hc = bridge_channel->tech_pvt;
|
|
if (!hc) {
|
|
return;
|
|
}
|
|
|
|
switch (hc->idle_mode) {
|
|
case IDLE_MODE_MOH:
|
|
ast_moh_stop(bridge_channel->chan);
|
|
break;
|
|
case IDLE_MODE_RINGING:
|
|
ast_indicate(bridge_channel->chan, -1);
|
|
break;
|
|
case IDLE_MODE_NONE:
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void participant_reaction_announcer_join(struct ast_bridge_channel *bridge_channel)
|
|
{
|
|
struct ast_channel *chan;
|
|
chan = bridge_channel->chan;
|
|
participant_stop_hold_audio(bridge_channel);
|
|
if (ast_set_write_format_by_id(chan, AST_FORMAT_SLINEAR)) {
|
|
ast_log(LOG_WARNING, "Could not make participant %s compatible.\n", ast_channel_name(chan));
|
|
}
|
|
}
|
|
|
|
/* This should only be called on verified holding_participants. */
|
|
static void participant_start_hold_audio(struct ast_bridge_channel *bridge_channel)
|
|
{
|
|
struct holding_channel *hc = bridge_channel->tech_pvt;
|
|
const char *moh_class;
|
|
|
|
if (!hc) {
|
|
return;
|
|
}
|
|
|
|
switch(hc->idle_mode) {
|
|
case IDLE_MODE_MOH:
|
|
moh_class = ast_bridge_channel_get_role_option(bridge_channel, "holding_participant", "moh_class");
|
|
ast_moh_start(bridge_channel->chan, ast_strlen_zero(moh_class) ? NULL : moh_class, NULL);
|
|
break;
|
|
case IDLE_MODE_RINGING:
|
|
ast_indicate(bridge_channel->chan, AST_CONTROL_RINGING);
|
|
break;
|
|
case IDLE_MODE_NONE:
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void handle_participant_join(struct ast_bridge_channel *bridge_channel, struct ast_bridge_channel *announcer_channel)
|
|
{
|
|
struct ast_channel *us = bridge_channel->chan;
|
|
struct holding_channel *hc = bridge_channel->tech_pvt;
|
|
const char *idle_mode = ast_bridge_channel_get_role_option(bridge_channel, "holding_participant", "idle_mode");
|
|
|
|
|
|
if (!hc) {
|
|
return;
|
|
}
|
|
|
|
if (ast_strlen_zero(idle_mode)) {
|
|
hc->idle_mode = IDLE_MODE_NONE;
|
|
} else if (!strcmp(idle_mode, "musiconhold")) {
|
|
hc->idle_mode = IDLE_MODE_MOH;
|
|
} else if (!strcmp(idle_mode, "ringing")) {
|
|
hc->idle_mode = IDLE_MODE_RINGING;
|
|
} else {
|
|
ast_debug(2, "channel %s idle mode '%s' doesn't match any expected idle mode\n", ast_channel_name(us), idle_mode);
|
|
}
|
|
|
|
/* If the announcer channel isn't present, we need to set up ringing, music on hold, or whatever. */
|
|
if (!announcer_channel) {
|
|
participant_start_hold_audio(bridge_channel);
|
|
return;
|
|
}
|
|
|
|
/* If it is present though, we need to establish compatability. */
|
|
if (ast_set_write_format_by_id(us, AST_FORMAT_SLINEAR)) {
|
|
ast_log(LOG_WARNING, "Could not make participant %s compatible.\n", ast_channel_name(us));
|
|
}
|
|
}
|
|
|
|
static int holding_bridge_join(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel)
|
|
{
|
|
struct ast_bridge_channel *other_channel;
|
|
struct ast_bridge_channel *announcer_channel;
|
|
struct holding_channel *hc;
|
|
struct ast_channel *us = bridge_channel->chan; /* The joining channel */
|
|
|
|
if (!(hc = ast_calloc(1, sizeof(*hc)))) {
|
|
return -1;
|
|
}
|
|
|
|
bridge_channel->tech_pvt = hc;
|
|
|
|
/* The bridge pvt holds the announcer channel if we have one. */
|
|
announcer_channel = bridge->tech_pvt;
|
|
|
|
if (ast_bridge_channel_has_role(bridge_channel, "announcer")) {
|
|
/* If another announcer already exists, scrap the holding channel struct so we know to ignore it in the future */
|
|
if (announcer_channel) {
|
|
bridge_channel->tech_pvt = NULL;
|
|
ast_free(hc);
|
|
ast_log(LOG_WARNING, "A second announcer channel %s attempted to enter a holding bridge.\n",
|
|
ast_channel_name(announcer_channel->chan));
|
|
return -1;
|
|
}
|
|
|
|
bridge->tech_pvt = bridge_channel;
|
|
ast_set_flag(&hc->holding_roles, HOLDING_ROLE_ANNOUNCER);
|
|
|
|
/* The announcer should always be made compatible with signed linear */
|
|
if (ast_set_read_format_by_id(us, AST_FORMAT_SLINEAR)) {
|
|
ast_log(LOG_ERROR, "Could not make announcer %s compatible.\n", ast_channel_name(us));
|
|
}
|
|
|
|
/* Make everyone compatible. While we are at it we should stop music on hold and ringing. */
|
|
AST_LIST_TRAVERSE(&bridge->channels, other_channel, entry) {
|
|
/* Skip the reaction if we are the channel in question */
|
|
if (bridge_channel == other_channel) {
|
|
continue;
|
|
}
|
|
participant_reaction_announcer_join(other_channel);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* If the entering channel isn't an announcer then we need to setup it's properties and put it in its holding state if necessary */
|
|
ast_set_flag(&hc->holding_roles, HOLDING_ROLE_PARTICIPANT);
|
|
handle_participant_join(bridge_channel, announcer_channel);
|
|
return 0;
|
|
}
|
|
|
|
static void participant_reaction_announcer_leave(struct ast_bridge_channel *bridge_channel)
|
|
{
|
|
struct holding_channel *hc = bridge_channel->tech_pvt;
|
|
|
|
if (!hc) {
|
|
/* We are dealing with a channel that failed to join properly. Skip it. */
|
|
return;
|
|
}
|
|
|
|
ast_bridge_channel_restore_formats(bridge_channel);
|
|
if (ast_test_flag(&hc->holding_roles, HOLDING_ROLE_PARTICIPANT)) {
|
|
participant_start_hold_audio(bridge_channel);
|
|
}
|
|
}
|
|
|
|
static void holding_bridge_leave(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel)
|
|
{
|
|
struct ast_bridge_channel *other_channel;
|
|
struct holding_channel *hc = bridge_channel->tech_pvt;
|
|
|
|
if (!hc) {
|
|
return;
|
|
}
|
|
|
|
if (!ast_test_flag(&hc->holding_roles, HOLDING_ROLE_ANNOUNCER)) {
|
|
/* It's not an announcer so nothing needs to react to its departure. Just free the tech_pvt. */
|
|
if (!bridge->tech_pvt) {
|
|
/* Since no announcer is in the channel, we may be playing MOH/ringing. Stop that. */
|
|
participant_stop_hold_audio(bridge_channel);
|
|
}
|
|
ast_free(hc);
|
|
bridge_channel->tech_pvt = NULL;
|
|
return;
|
|
}
|
|
|
|
/* When the announcer leaves, the other channels should reset their formats and go back to moh/ringing */
|
|
AST_LIST_TRAVERSE(&bridge->channels, other_channel, entry) {
|
|
participant_reaction_announcer_leave(other_channel);
|
|
}
|
|
|
|
/* Since the announcer is leaving, we should clear the tech_pvt pointing to it */
|
|
bridge->tech_pvt = NULL;
|
|
|
|
ast_free(hc);
|
|
bridge_channel->tech_pvt = NULL;
|
|
}
|
|
|
|
static int holding_bridge_write(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel, struct ast_frame *frame)
|
|
{
|
|
struct ast_bridge_channel *cur;
|
|
struct holding_channel *hc = bridge_channel->tech_pvt;
|
|
|
|
/* If there is no tech_pvt, then the channel failed to allocate one when it joined and is borked. Don't listen to him. */
|
|
if (!hc) {
|
|
return -1;
|
|
}
|
|
|
|
/* If we aren't an announcer, we never have any business writing anything. */
|
|
if (!ast_test_flag(&hc->holding_roles, HOLDING_ROLE_ANNOUNCER)) {
|
|
return -1;
|
|
}
|
|
|
|
/* Ok, so we are the announcer and there are one or more people available to receive our writes. Let's do it. */
|
|
AST_LIST_TRAVERSE(&bridge->channels, cur, entry) {
|
|
if (bridge_channel == cur || !cur->tech_pvt) {
|
|
continue;
|
|
}
|
|
|
|
ast_bridge_channel_queue_frame(cur, frame);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct ast_bridge_technology holding_bridge = {
|
|
.name = "holding_bridge",
|
|
.capabilities = AST_BRIDGE_CAPABILITY_HOLDING,
|
|
.preference = AST_BRIDGE_PREFERENCE_BASE_HOLDING,
|
|
.write = holding_bridge_write,
|
|
.join = holding_bridge_join,
|
|
.leave = holding_bridge_leave,
|
|
};
|
|
|
|
static int unload_module(void)
|
|
{
|
|
ast_format_cap_destroy(holding_bridge.format_capabilities);
|
|
return ast_bridge_technology_unregister(&holding_bridge);
|
|
}
|
|
|
|
static int load_module(void)
|
|
{
|
|
if (!(holding_bridge.format_capabilities = ast_format_cap_alloc())) {
|
|
return AST_MODULE_LOAD_DECLINE;
|
|
}
|
|
ast_format_cap_add_all_by_type(holding_bridge.format_capabilities, AST_FORMAT_TYPE_AUDIO);
|
|
ast_format_cap_add_all_by_type(holding_bridge.format_capabilities, AST_FORMAT_TYPE_VIDEO);
|
|
ast_format_cap_add_all_by_type(holding_bridge.format_capabilities, AST_FORMAT_TYPE_TEXT);
|
|
|
|
return ast_bridge_technology_register(&holding_bridge);
|
|
}
|
|
|
|
AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Holding bridge module");
|
|
|