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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2007, Digium, Inc.
*
* Joshua Colp <jcolp@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 Simple two channel bridging module
*
* \author Joshua Colp <jcolp@digium.com>
*
* \ingroup bridges
*/
#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"
static int simple_bridge_join(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel)
{
struct ast_channel *c0 = AST_LIST_FIRST(&bridge->channels)->chan, *c1 = AST_LIST_LAST(&bridge->channels)->chan;
/* If this is the first channel we can't make it compatible... unless we make it compatible with itself O.o */
if (AST_LIST_FIRST(&bridge->channels) == AST_LIST_LAST(&bridge->channels)) {
return 0;
}
/* See if we need to make these compatible */
if (((c0->writeformat == c1->readformat) && (c0->readformat == c1->writeformat) && (c0->nativeformats == c1->nativeformats))) {
return 0;
}
/* BOOM! We do. */
return ast_channel_make_compatible(c0, c1);
}
static enum ast_bridge_write_result simple_bridge_write(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel, struct ast_frame *frame)
{
struct ast_bridge_channel *other = NULL;
/* If this is the only channel in this bridge then immediately exit */
if (AST_LIST_FIRST(&bridge->channels) == AST_LIST_LAST(&bridge->channels)) {
return AST_BRIDGE_WRITE_FAILED;
}
/* Find the channel we actually want to write to */
if (!(other = (AST_LIST_FIRST(&bridge->channels) == bridge_channel ? AST_LIST_LAST(&bridge->channels) : AST_LIST_FIRST(&bridge->channels)))) {
return AST_BRIDGE_WRITE_FAILED;
}
/* Write the frame out if they are in the waiting state... don't worry about freeing it, the bridging core will take care of it */
if (other->state == AST_BRIDGE_CHANNEL_STATE_WAIT) {
ast_write(other->chan, frame);
}
return AST_BRIDGE_WRITE_SUCCESS;
}
static struct ast_bridge_technology simple_bridge = {
.name = "simple_bridge",
.capabilities = AST_BRIDGE_CAPABILITY_1TO1MIX | AST_BRIDGE_CAPABILITY_THREAD,
.preference = AST_BRIDGE_PREFERENCE_MEDIUM,
.formats = AST_FORMAT_AUDIO_MASK | AST_FORMAT_VIDEO_MASK | AST_FORMAT_TEXT_MASK,
.join = simple_bridge_join,
.write = simple_bridge_write,
};
static int unload_module(void)
{
return ast_bridge_technology_unregister(&simple_bridge);
}
static int load_module(void)
{
return ast_bridge_technology_register(&simple_bridge);
}
AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Simple two channel bridging module");
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