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c26c190711
This patch is the foundation of an entire new way of looking at media in Asterisk. The code present in this patch is everything required to complete phase1 of my Media Architecture proposal. For more information about this project visit the link below. https://wiki.asterisk.org/wiki/display/AST/Media+Architecture+Proposal The primary function of this patch is to convert all the usages of format bitfields in Asterisk to use the new format and format_cap APIs. Functionally no change in behavior should be present in this patch. Thanks to twilson and russell for all the time they spent reviewing these changes. Review: https://reviewboard.asterisk.org/r/1083/ git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@306010 65c4cc65-6c06-0410-ace0-fbb531ad65f3
113 lines
3.6 KiB
C
113 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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#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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