117 lines
3.6 KiB
C
117 lines
3.6 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2007, Digium, Inc.
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*
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* Joshua Colp <jcolp@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*! \file
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*
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* \brief Simple two channel bridging module
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*
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* \author Joshua Colp <jcolp@digium.com>
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*
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* \ingroup bridges
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*/
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/*** MODULEINFO
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<support_level>core</support_level>
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***/
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#include "asterisk.h"
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ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include "asterisk/module.h"
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#include "asterisk/channel.h"
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#include "asterisk/bridging.h"
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#include "asterisk/bridging_technology.h"
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#include "asterisk/frame.h"
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static int simple_bridge_join(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel)
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{
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struct ast_channel *c0 = AST_LIST_FIRST(&bridge->channels)->chan, *c1 = AST_LIST_LAST(&bridge->channels)->chan;
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/* If this is the first channel we can't make it compatible... unless we make it compatible with itself O.o */
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if (AST_LIST_FIRST(&bridge->channels) == AST_LIST_LAST(&bridge->channels)) {
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return 0;
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}
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/* See if we need to make these compatible */
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if ((ast_format_cmp(&c0->writeformat, &c1->readformat) == AST_FORMAT_CMP_EQUAL) &&
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(ast_format_cmp(&c0->readformat, &c1->writeformat) == AST_FORMAT_CMP_EQUAL) &&
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(ast_format_cap_identical(c0->nativeformats, c1->nativeformats))) {
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return 0;
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}
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/* BOOM! We do. */
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return ast_channel_make_compatible(c0, c1);
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}
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static enum ast_bridge_write_result simple_bridge_write(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel, struct ast_frame *frame)
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{
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struct ast_bridge_channel *other = NULL;
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/* If this is the only channel in this bridge then immediately exit */
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if (AST_LIST_FIRST(&bridge->channels) == AST_LIST_LAST(&bridge->channels)) {
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return AST_BRIDGE_WRITE_FAILED;
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}
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/* Find the channel we actually want to write to */
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if (!(other = (AST_LIST_FIRST(&bridge->channels) == bridge_channel ? AST_LIST_LAST(&bridge->channels) : AST_LIST_FIRST(&bridge->channels)))) {
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return AST_BRIDGE_WRITE_FAILED;
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}
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/* 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 */
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if (other->state == AST_BRIDGE_CHANNEL_STATE_WAIT) {
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ast_write(other->chan, frame);
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}
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return AST_BRIDGE_WRITE_SUCCESS;
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}
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static struct ast_bridge_technology simple_bridge = {
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.name = "simple_bridge",
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.capabilities = AST_BRIDGE_CAPABILITY_1TO1MIX | AST_BRIDGE_CAPABILITY_THREAD,
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.preference = AST_BRIDGE_PREFERENCE_MEDIUM,
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.join = simple_bridge_join,
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.write = simple_bridge_write,
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};
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static int unload_module(void)
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{
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ast_format_cap_destroy(simple_bridge.format_capabilities);
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return ast_bridge_technology_unregister(&simple_bridge);
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}
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static int load_module(void)
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{
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if (!(simple_bridge.format_capabilities = ast_format_cap_alloc())) {
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return AST_MODULE_LOAD_DECLINE;
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}
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ast_format_cap_add_all_by_type(simple_bridge.format_capabilities, AST_FORMAT_TYPE_AUDIO);
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ast_format_cap_add_all_by_type(simple_bridge.format_capabilities, AST_FORMAT_TYPE_VIDEO);
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ast_format_cap_add_all_by_type(simple_bridge.format_capabilities, AST_FORMAT_TYPE_TEXT);
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return ast_bridge_technology_register(&simple_bridge);
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}
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AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Simple two channel bridging module");
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