ASTERISK_REGISTER_FILE no longer has any purpose so this commit removes all traces of it. Previously exported symbols removed: * __ast_register_file * __ast_unregister_file * ast_complete_source_filename This also removes the mtx_prof static variable that was declared when MTX_PROFILE was enabled. This variable was only used in lock.c so it is now initialized in that file only. ASTERISK-26480 #close Change-Id: I1074af07d71f9e159c48ef36631aa432c86f9966
511 lines
19 KiB
C
511 lines
19 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2013, 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 Native RTP bridging technology 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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#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/bridge.h"
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#include "asterisk/bridge_technology.h"
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#include "asterisk/frame.h"
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#include "asterisk/rtp_engine.h"
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/*! \brief Internal structure which contains information about bridged RTP channels */
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struct native_rtp_bridge_data {
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/*! \brief Framehook used to intercept certain control frames */
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int id;
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/*! \brief Set when this framehook has been detached */
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unsigned int detached;
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};
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/*! \brief Internal helper function which gets all RTP information (glue and instances) relating to the given channels */
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static enum ast_rtp_glue_result native_rtp_bridge_get(struct ast_channel *c0, struct ast_channel *c1, struct ast_rtp_glue **glue0,
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struct ast_rtp_glue **glue1, struct ast_rtp_instance **instance0, struct ast_rtp_instance **instance1,
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struct ast_rtp_instance **vinstance0, struct ast_rtp_instance **vinstance1)
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{
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enum ast_rtp_glue_result audio_glue0_res;
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enum ast_rtp_glue_result video_glue0_res;
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enum ast_rtp_glue_result audio_glue1_res;
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enum ast_rtp_glue_result video_glue1_res;
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if (!(*glue0 = ast_rtp_instance_get_glue(ast_channel_tech(c0)->type)) ||
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!(*glue1 = ast_rtp_instance_get_glue(ast_channel_tech(c1)->type))) {
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return AST_RTP_GLUE_RESULT_FORBID;
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}
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audio_glue0_res = (*glue0)->get_rtp_info(c0, instance0);
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video_glue0_res = (*glue0)->get_vrtp_info ? (*glue0)->get_vrtp_info(c0, vinstance0) : AST_RTP_GLUE_RESULT_FORBID;
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audio_glue1_res = (*glue1)->get_rtp_info(c1, instance1);
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video_glue1_res = (*glue1)->get_vrtp_info ? (*glue1)->get_vrtp_info(c1, vinstance1) : AST_RTP_GLUE_RESULT_FORBID;
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/* Apply any limitations on direct media bridging that may be present */
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if (audio_glue0_res == audio_glue1_res && audio_glue1_res == AST_RTP_GLUE_RESULT_REMOTE) {
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if ((*glue0)->allow_rtp_remote && !((*glue0)->allow_rtp_remote(c0, *instance1))) {
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/* If the allow_rtp_remote indicates that remote isn't allowed, revert to local bridge */
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audio_glue0_res = audio_glue1_res = AST_RTP_GLUE_RESULT_LOCAL;
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} else if ((*glue1)->allow_rtp_remote && !((*glue1)->allow_rtp_remote(c1, *instance0))) {
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audio_glue0_res = audio_glue1_res = AST_RTP_GLUE_RESULT_LOCAL;
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}
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}
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if (video_glue0_res == video_glue1_res && video_glue1_res == AST_RTP_GLUE_RESULT_REMOTE) {
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if ((*glue0)->allow_vrtp_remote && !((*glue0)->allow_vrtp_remote(c0, *instance1))) {
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/* if the allow_vrtp_remote indicates that remote isn't allowed, revert to local bridge */
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video_glue0_res = video_glue1_res = AST_RTP_GLUE_RESULT_LOCAL;
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} else if ((*glue1)->allow_vrtp_remote && !((*glue1)->allow_vrtp_remote(c1, *instance0))) {
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video_glue0_res = video_glue1_res = AST_RTP_GLUE_RESULT_LOCAL;
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}
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}
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/* If we are carrying video, and both sides are not going to remotely bridge... fail the native bridge */
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if (video_glue0_res != AST_RTP_GLUE_RESULT_FORBID
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&& (audio_glue0_res != AST_RTP_GLUE_RESULT_REMOTE
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|| video_glue0_res != AST_RTP_GLUE_RESULT_REMOTE)) {
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audio_glue0_res = AST_RTP_GLUE_RESULT_FORBID;
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}
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if (video_glue1_res != AST_RTP_GLUE_RESULT_FORBID
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&& (audio_glue1_res != AST_RTP_GLUE_RESULT_REMOTE
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|| video_glue1_res != AST_RTP_GLUE_RESULT_REMOTE)) {
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audio_glue1_res = AST_RTP_GLUE_RESULT_FORBID;
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}
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/* The order of preference is: forbid, local, and remote. */
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if (audio_glue0_res == AST_RTP_GLUE_RESULT_FORBID ||
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audio_glue1_res == AST_RTP_GLUE_RESULT_FORBID) {
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/* If any sort of bridge is forbidden just completely bail out and go back to generic bridging */
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return AST_RTP_GLUE_RESULT_FORBID;
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} else if (audio_glue0_res == AST_RTP_GLUE_RESULT_LOCAL ||
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audio_glue1_res == AST_RTP_GLUE_RESULT_LOCAL) {
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return AST_RTP_GLUE_RESULT_LOCAL;
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} else {
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return AST_RTP_GLUE_RESULT_REMOTE;
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}
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}
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/*!
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* \internal
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* \brief Start native RTP bridging of two channels
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*
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* \param bridge The bridge that had native RTP bridging happening on it
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* \param target If remote RTP bridging, the channel that is unheld.
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*
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* \note Bridge must be locked when calling this function.
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*/
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static void native_rtp_bridge_start(struct ast_bridge *bridge, struct ast_channel *target)
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{
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struct ast_bridge_channel *bc0 = AST_LIST_FIRST(&bridge->channels);
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struct ast_bridge_channel *bc1 = AST_LIST_LAST(&bridge->channels);
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enum ast_rtp_glue_result native_type;
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struct ast_rtp_glue *glue0, *glue1;
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RAII_VAR(struct ast_rtp_instance *, instance0, NULL, ao2_cleanup);
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RAII_VAR(struct ast_rtp_instance *, instance1, NULL, ao2_cleanup);
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RAII_VAR(struct ast_rtp_instance *, vinstance0, NULL, ao2_cleanup);
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RAII_VAR(struct ast_rtp_instance *, vinstance1, NULL, ao2_cleanup);
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RAII_VAR(struct ast_rtp_instance *, tinstance0, NULL, ao2_cleanup);
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RAII_VAR(struct ast_rtp_instance *, tinstance1, NULL, ao2_cleanup);
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RAII_VAR(struct ast_format_cap *, cap0, ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT), ao2_cleanup);
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RAII_VAR(struct ast_format_cap *, cap1, ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT), ao2_cleanup);
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if (bc0 == bc1) {
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return;
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}
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ast_channel_lock_both(bc0->chan, bc1->chan);
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native_type = native_rtp_bridge_get(bc0->chan, bc1->chan, &glue0, &glue1, &instance0, &instance1, &vinstance0, &vinstance1);
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switch (native_type) {
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case AST_RTP_GLUE_RESULT_LOCAL:
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if (ast_rtp_instance_get_engine(instance0)->local_bridge) {
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ast_rtp_instance_get_engine(instance0)->local_bridge(instance0, instance1);
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}
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if (ast_rtp_instance_get_engine(instance1)->local_bridge) {
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ast_rtp_instance_get_engine(instance1)->local_bridge(instance1, instance0);
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}
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ast_rtp_instance_set_bridged(instance0, instance1);
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ast_rtp_instance_set_bridged(instance1, instance0);
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ast_verb(4, "Locally RTP bridged '%s' and '%s' in stack\n",
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ast_channel_name(bc0->chan), ast_channel_name(bc1->chan));
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break;
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case AST_RTP_GLUE_RESULT_REMOTE:
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if (glue0->get_codec) {
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glue0->get_codec(bc0->chan, cap0);
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}
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if (glue1->get_codec) {
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glue1->get_codec(bc1->chan, cap1);
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}
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/* If we have a target, it's the channel that received the UNHOLD or UPDATE_RTP_PEER frame and was told to resume */
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if (!target) {
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glue0->update_peer(bc0->chan, instance1, vinstance1, tinstance1, cap1, 0);
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glue1->update_peer(bc1->chan, instance0, vinstance0, tinstance0, cap0, 0);
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ast_verb(4, "Remotely bridged '%s' and '%s' - media will flow directly between them\n",
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ast_channel_name(bc0->chan), ast_channel_name(bc1->chan));
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} else {
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/*
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* If a target was provided, it is the recipient of an unhold or an update and needs to have
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* its media redirected to fit the current remote bridging needs. The other channel is either
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* already set up to handle the new media path or will have its own set of updates independent
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* of this pass.
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*/
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if (bc0->chan == target) {
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glue0->update_peer(bc0->chan, instance1, vinstance1, tinstance1, cap1, 0);
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} else {
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glue1->update_peer(bc1->chan, instance0, vinstance0, tinstance0, cap0, 0);
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}
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}
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break;
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case AST_RTP_GLUE_RESULT_FORBID:
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break;
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}
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ast_channel_unlock(bc0->chan);
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ast_channel_unlock(bc1->chan);
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}
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static void native_rtp_bridge_stop(struct ast_bridge *bridge, struct ast_channel *target)
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{
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struct ast_bridge_channel *bc0 = AST_LIST_FIRST(&bridge->channels);
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struct ast_bridge_channel *bc1 = AST_LIST_LAST(&bridge->channels);
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enum ast_rtp_glue_result native_type;
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struct ast_rtp_glue *glue0, *glue1 = NULL;
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RAII_VAR(struct ast_rtp_instance *, instance0, NULL, ao2_cleanup);
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RAII_VAR(struct ast_rtp_instance *, instance1, NULL, ao2_cleanup);
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RAII_VAR(struct ast_rtp_instance *, vinstance0, NULL, ao2_cleanup);
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RAII_VAR(struct ast_rtp_instance *, vinstance1, NULL, ao2_cleanup);
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if (bc0 == bc1) {
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return;
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}
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ast_channel_lock_both(bc0->chan, bc1->chan);
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native_type = native_rtp_bridge_get(bc0->chan, bc1->chan, &glue0, &glue1, &instance0, &instance1, &vinstance0, &vinstance1);
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switch (native_type) {
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case AST_RTP_GLUE_RESULT_LOCAL:
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if (ast_rtp_instance_get_engine(instance0)->local_bridge) {
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ast_rtp_instance_get_engine(instance0)->local_bridge(instance0, NULL);
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}
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if (instance1 && ast_rtp_instance_get_engine(instance1)->local_bridge) {
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ast_rtp_instance_get_engine(instance1)->local_bridge(instance1, NULL);
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}
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ast_rtp_instance_set_bridged(instance0, NULL);
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if (instance1) {
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ast_rtp_instance_set_bridged(instance1, NULL);
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}
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break;
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case AST_RTP_GLUE_RESULT_REMOTE:
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if (target) {
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/*
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* If a target was provided, it is being put on hold and should expect to
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* receive media from Asterisk instead of what it was previously connected to.
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*/
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if (bc0->chan == target) {
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glue0->update_peer(bc0->chan, NULL, NULL, NULL, NULL, 0);
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} else {
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glue1->update_peer(bc1->chan, NULL, NULL, NULL, NULL, 0);
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}
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}
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break;
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case AST_RTP_GLUE_RESULT_FORBID:
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break;
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}
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if (!target && native_type != AST_RTP_GLUE_RESULT_FORBID) {
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glue0->update_peer(bc0->chan, NULL, NULL, NULL, NULL, 0);
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glue1->update_peer(bc1->chan, NULL, NULL, NULL, NULL, 0);
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}
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ast_debug(2, "Discontinued RTP bridging of '%s' and '%s' - media will flow through Asterisk core\n",
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ast_channel_name(bc0->chan), ast_channel_name(bc1->chan));
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ast_channel_unlock(bc0->chan);
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ast_channel_unlock(bc1->chan);
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}
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/*! \brief Frame hook that is called to intercept hold/unhold */
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static struct ast_frame *native_rtp_framehook(struct ast_channel *chan, struct ast_frame *f, enum ast_framehook_event event, void *data)
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{
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RAII_VAR(struct ast_bridge *, bridge, NULL, ao2_cleanup);
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struct native_rtp_bridge_data *native_data = data;
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if (!f || (event != AST_FRAMEHOOK_EVENT_WRITE)) {
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return f;
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}
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bridge = ast_channel_get_bridge(chan);
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if (bridge) {
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/* native_rtp_bridge_start/stop are not being called from bridging
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core so we need to lock the bridge prior to calling these functions
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Unfortunately that means unlocking the channel, but as it
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should not be modified this should be okay... hopefully...
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unless this channel is being moved around right now and is in
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the process of having this framehook removed (which is fine). To
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ensure we then don't stop or start when we shouldn't we consult
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the data provided. If this framehook has been detached then the
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detached variable will be set. This is safe to check as it is only
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manipulated with the bridge lock held. */
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ast_channel_unlock(chan);
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ast_bridge_lock(bridge);
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if (!native_data->detached) {
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if (f->subclass.integer == AST_CONTROL_HOLD) {
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native_rtp_bridge_stop(bridge, chan);
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} else if ((f->subclass.integer == AST_CONTROL_UNHOLD) ||
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(f->subclass.integer == AST_CONTROL_UPDATE_RTP_PEER)) {
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native_rtp_bridge_start(bridge, chan);
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}
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}
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ast_bridge_unlock(bridge);
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ast_channel_lock(chan);
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}
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return f;
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}
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/*! \brief Callback function which informs upstream if we are consuming a frame of a specific type */
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static int native_rtp_framehook_consume(void *data, enum ast_frame_type type)
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{
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return (type == AST_FRAME_CONTROL ? 1 : 0);
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}
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/*! \brief Internal helper function which checks whether the channels are compatible with our native bridging */
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static int native_rtp_bridge_capable(struct ast_channel *chan)
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{
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return !ast_channel_has_hook_requiring_audio(chan);
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}
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static int native_rtp_bridge_compatible(struct ast_bridge *bridge)
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{
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struct ast_bridge_channel *bc0 = AST_LIST_FIRST(&bridge->channels);
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struct ast_bridge_channel *bc1 = AST_LIST_LAST(&bridge->channels);
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enum ast_rtp_glue_result native_type;
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struct ast_rtp_glue *glue0, *glue1;
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RAII_VAR(struct ast_rtp_instance *, instance0, NULL, ao2_cleanup);
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RAII_VAR(struct ast_rtp_instance *, instance1, NULL, ao2_cleanup);
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RAII_VAR(struct ast_rtp_instance *, vinstance0, NULL, ao2_cleanup);
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RAII_VAR(struct ast_rtp_instance *, vinstance1, NULL, ao2_cleanup);
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RAII_VAR(struct ast_format_cap *, cap0, NULL, ao2_cleanup);
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RAII_VAR(struct ast_format_cap *, cap1, NULL, ao2_cleanup);
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int read_ptime0, read_ptime1, write_ptime0, write_ptime1;
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/* We require two channels before even considering native bridging */
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if (bridge->num_channels != 2) {
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ast_debug(1, "Bridge '%s' can not use native RTP bridge as two channels are required\n",
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bridge->uniqueid);
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return 0;
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}
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if (!native_rtp_bridge_capable(bc0->chan)) {
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ast_debug(1, "Bridge '%s' can not use native RTP bridge as channel '%s' has features which prevent it\n",
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bridge->uniqueid, ast_channel_name(bc0->chan));
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return 0;
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}
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if (!native_rtp_bridge_capable(bc1->chan)) {
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ast_debug(1, "Bridge '%s' can not use native RTP bridge as channel '%s' has features which prevent it\n",
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bridge->uniqueid, ast_channel_name(bc1->chan));
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return 0;
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}
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if ((native_type = native_rtp_bridge_get(bc0->chan, bc1->chan, &glue0, &glue1, &instance0, &instance1, &vinstance0, &vinstance1))
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== AST_RTP_GLUE_RESULT_FORBID) {
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ast_debug(1, "Bridge '%s' can not use native RTP bridge as it was forbidden while getting details\n",
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bridge->uniqueid);
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return 0;
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}
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if (ao2_container_count(bc0->features->dtmf_hooks) && ast_rtp_instance_dtmf_mode_get(instance0)) {
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ast_debug(1, "Bridge '%s' can not use native RTP bridge as channel '%s' has DTMF hooks\n",
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bridge->uniqueid, ast_channel_name(bc0->chan));
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return 0;
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}
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if (ao2_container_count(bc1->features->dtmf_hooks) && ast_rtp_instance_dtmf_mode_get(instance1)) {
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ast_debug(1, "Bridge '%s' can not use native RTP bridge as channel '%s' has DTMF hooks\n",
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bridge->uniqueid, ast_channel_name(bc1->chan));
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return 0;
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}
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if ((native_type == AST_RTP_GLUE_RESULT_LOCAL) && ((ast_rtp_instance_get_engine(instance0)->local_bridge !=
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ast_rtp_instance_get_engine(instance1)->local_bridge) ||
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(ast_rtp_instance_get_engine(instance0)->dtmf_compatible &&
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!ast_rtp_instance_get_engine(instance0)->dtmf_compatible(bc0->chan, instance0, bc1->chan, instance1)))) {
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ast_debug(1, "Bridge '%s' can not use local native RTP bridge as local bridge or DTMF is not compatible\n",
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bridge->uniqueid);
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return 0;
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}
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cap0 = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT);
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cap1 = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT);
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if (!cap0 || !cap1) {
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return 0;
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}
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/* Make sure that codecs match */
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if (glue0->get_codec) {
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glue0->get_codec(bc0->chan, cap0);
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}
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if (glue1->get_codec) {
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glue1->get_codec(bc1->chan, cap1);
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}
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if (ast_format_cap_count(cap0) != 0 && ast_format_cap_count(cap1) != 0 && !ast_format_cap_iscompatible(cap0, cap1)) {
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struct ast_str *codec_buf0 = ast_str_alloca(AST_FORMAT_CAP_NAMES_LEN);
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struct ast_str *codec_buf1 = ast_str_alloca(AST_FORMAT_CAP_NAMES_LEN);
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ast_debug(1, "Channel codec0 = %s is not codec1 = %s, cannot native bridge in RTP.\n",
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|
ast_format_cap_get_names(cap0, &codec_buf0), ast_format_cap_get_names(cap1, &codec_buf1));
|
|
return 0;
|
|
}
|
|
|
|
read_ptime0 = ast_format_cap_get_format_framing(cap0, ast_channel_rawreadformat(bc0->chan));
|
|
read_ptime1 = ast_format_cap_get_format_framing(cap1, ast_channel_rawreadformat(bc1->chan));
|
|
write_ptime0 = ast_format_cap_get_format_framing(cap0, ast_channel_rawwriteformat(bc0->chan));
|
|
write_ptime1 = ast_format_cap_get_format_framing(cap1, ast_channel_rawwriteformat(bc1->chan));
|
|
|
|
if (read_ptime0 != write_ptime1 || read_ptime1 != write_ptime0) {
|
|
ast_debug(1, "Packetization differs between RTP streams (%d != %d or %d != %d). Cannot native bridge in RTP\n",
|
|
read_ptime0, write_ptime1, read_ptime1, write_ptime0);
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*! \brief Helper function which adds frame hook to bridge channel */
|
|
static int native_rtp_bridge_framehook_attach(struct ast_bridge_channel *bridge_channel)
|
|
{
|
|
struct native_rtp_bridge_data *data = ao2_alloc(sizeof(*data), NULL);
|
|
static struct ast_framehook_interface hook = {
|
|
.version = AST_FRAMEHOOK_INTERFACE_VERSION,
|
|
.event_cb = native_rtp_framehook,
|
|
.destroy_cb = __ao2_cleanup,
|
|
.consume_cb = native_rtp_framehook_consume,
|
|
.disable_inheritance = 1,
|
|
};
|
|
|
|
if (!data) {
|
|
return -1;
|
|
}
|
|
|
|
ast_channel_lock(bridge_channel->chan);
|
|
hook.data = ao2_bump(data);
|
|
data->id = ast_framehook_attach(bridge_channel->chan, &hook);
|
|
ast_channel_unlock(bridge_channel->chan);
|
|
if (data->id < 0) {
|
|
/* We need to drop both the reference we hold, and the one the framehook would hold */
|
|
ao2_ref(data, -2);
|
|
return -1;
|
|
}
|
|
|
|
bridge_channel->tech_pvt = data;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*! \brief Helper function which removes frame hook from bridge channel */
|
|
static void native_rtp_bridge_framehook_detach(struct ast_bridge_channel *bridge_channel)
|
|
{
|
|
RAII_VAR(struct native_rtp_bridge_data *, data, bridge_channel->tech_pvt, ao2_cleanup);
|
|
|
|
if (!data) {
|
|
return;
|
|
}
|
|
|
|
ast_channel_lock(bridge_channel->chan);
|
|
ast_framehook_detach(bridge_channel->chan, data->id);
|
|
data->detached = 1;
|
|
ast_channel_unlock(bridge_channel->chan);
|
|
bridge_channel->tech_pvt = NULL;
|
|
}
|
|
|
|
static int native_rtp_bridge_join(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel)
|
|
{
|
|
native_rtp_bridge_framehook_detach(bridge_channel);
|
|
if (native_rtp_bridge_framehook_attach(bridge_channel)) {
|
|
return -1;
|
|
}
|
|
|
|
native_rtp_bridge_start(bridge, NULL);
|
|
return 0;
|
|
}
|
|
|
|
static void native_rtp_bridge_unsuspend(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel)
|
|
{
|
|
native_rtp_bridge_join(bridge, bridge_channel);
|
|
}
|
|
|
|
static void native_rtp_bridge_leave(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel)
|
|
{
|
|
native_rtp_bridge_framehook_detach(bridge_channel);
|
|
native_rtp_bridge_stop(bridge, NULL);
|
|
}
|
|
|
|
static int native_rtp_bridge_write(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel, struct ast_frame *frame)
|
|
{
|
|
return ast_bridge_queue_everyone_else(bridge, bridge_channel, frame);
|
|
}
|
|
|
|
static struct ast_bridge_technology native_rtp_bridge = {
|
|
.name = "native_rtp",
|
|
.capabilities = AST_BRIDGE_CAPABILITY_NATIVE,
|
|
.preference = AST_BRIDGE_PREFERENCE_BASE_NATIVE,
|
|
.join = native_rtp_bridge_join,
|
|
.unsuspend = native_rtp_bridge_unsuspend,
|
|
.leave = native_rtp_bridge_leave,
|
|
.suspend = native_rtp_bridge_leave,
|
|
.write = native_rtp_bridge_write,
|
|
.compatible = native_rtp_bridge_compatible,
|
|
};
|
|
|
|
static int unload_module(void)
|
|
{
|
|
ast_bridge_technology_unregister(&native_rtp_bridge);
|
|
return 0;
|
|
}
|
|
|
|
static int load_module(void)
|
|
{
|
|
if (ast_bridge_technology_register(&native_rtp_bridge)) {
|
|
unload_module();
|
|
return AST_MODULE_LOAD_DECLINE;
|
|
}
|
|
return AST_MODULE_LOAD_SUCCESS;
|
|
}
|
|
|
|
AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Native RTP bridging module");
|