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415 lines
16 KiB
415 lines
16 KiB
/*
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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 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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#include "asterisk/rtp_engine.h"
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#include "asterisk/audiohook.h"
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/*! \brief Forward declarations for frame hook usage */
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static int native_rtp_bridge_join(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel);
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static void native_rtp_bridge_leave(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel);
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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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};
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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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if (!f || (event != AST_FRAMEHOOK_EVENT_WRITE)) {
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return f;
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}
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ast_channel_lock(chan);
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bridge = ast_channel_get_bridge(chan);
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ast_channel_unlock(chan);
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/* It's safe for NULL to be passed to both of these, bridge_channel isn't used at all */
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if (bridge) {
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if (f->subclass.integer == AST_CONTROL_HOLD) {
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native_rtp_bridge_leave(ast_channel_internal_bridge(chan), NULL);
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} else if ((f->subclass.integer == AST_CONTROL_UNHOLD) || (f->subclass.integer == AST_CONTROL_UPDATE_RTP_PEER)) {
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native_rtp_bridge_join(ast_channel_internal_bridge(chan), NULL);
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}
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}
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return f;
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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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if (ast_channel_monitor(chan) || (ast_channel_audiohooks(chan) &&
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!ast_audiohook_write_list_empty(ast_channel_audiohooks(chan))) ||
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!ast_framehook_list_is_empty(ast_channel_framehooks(chan))) {
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return 0;
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} else {
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return 1;
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}
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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 = AST_RTP_GLUE_RESULT_FORBID, video_glue0_res = AST_RTP_GLUE_RESULT_FORBID;
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enum ast_rtp_glue_result audio_glue1_res = AST_RTP_GLUE_RESULT_FORBID, video_glue1_res = AST_RTP_GLUE_RESULT_FORBID;
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if (!(*glue0 = ast_rtp_instance_get_glue(ast_channel_tech(c0)->type)) ||
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(c1 && !(*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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if (c1) {
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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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}
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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 (c1 && 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 && (audio_glue0_res != AST_RTP_GLUE_RESULT_REMOTE || 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 (c1 && video_glue1_res != AST_RTP_GLUE_RESULT_FORBID && (audio_glue1_res != AST_RTP_GLUE_RESULT_REMOTE || 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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/* If any sort of bridge is forbidden just completely bail out and go back to generic bridging */
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if (audio_glue0_res == AST_RTP_GLUE_RESULT_FORBID || (c1 && audio_glue1_res == AST_RTP_GLUE_RESULT_FORBID)) {
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return AST_RTP_GLUE_RESULT_FORBID;
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}
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return audio_glue0_res;
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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 *c0 = AST_LIST_FIRST(&bridge->channels);
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struct ast_bridge_channel *c1 = 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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struct ast_rtp_instance *instance0 = NULL, *instance1 = NULL, *vinstance0 = NULL, *vinstance1 = NULL;
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RAII_VAR(struct ast_format_cap *, cap0, ast_format_cap_alloc_nolock(), ast_format_cap_destroy);
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RAII_VAR(struct ast_format_cap *, cap1, ast_format_cap_alloc_nolock(), ast_format_cap_destroy);
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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(c0->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(c0->chan));
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return 0;
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}
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if (!native_rtp_bridge_capable(c1->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(c1->chan));
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return 0;
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}
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if ((native_type = native_rtp_bridge_get(c0->chan, c1->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(c0->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(c0->chan));
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return 0;
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}
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if (ao2_container_count(c1->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(c1->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(c0->chan, instance0, c1->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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/* Make sure that codecs match */
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if (glue0->get_codec) {
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glue0->get_codec(c0->chan, cap0);
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}
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if (glue1->get_codec) {
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glue1->get_codec(c1->chan, cap1);
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}
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if (!ast_format_cap_is_empty(cap0) && !ast_format_cap_is_empty(cap1) && !ast_format_cap_has_joint(cap0, cap1)) {
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char tmp0[256] = { 0, }, tmp1[256] = { 0, };
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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_getformatname_multiple(tmp0, sizeof(tmp0), cap0),
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ast_getformatname_multiple(tmp1, sizeof(tmp1), cap1));
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return 0;
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}
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read_ptime0 = (ast_codec_pref_getsize(&ast_rtp_instance_get_codecs(instance0)->pref, ast_channel_rawreadformat(c0->chan))).cur_ms;
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read_ptime1 = (ast_codec_pref_getsize(&ast_rtp_instance_get_codecs(instance1)->pref, ast_channel_rawreadformat(c1->chan))).cur_ms;
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write_ptime0 = (ast_codec_pref_getsize(&ast_rtp_instance_get_codecs(instance0)->pref, ast_channel_rawwriteformat(c0->chan))).cur_ms;
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write_ptime1 = (ast_codec_pref_getsize(&ast_rtp_instance_get_codecs(instance1)->pref, ast_channel_rawwriteformat(c1->chan))).cur_ms;
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if (read_ptime0 != write_ptime1 || read_ptime1 != write_ptime0) {
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ast_debug(1, "Packetization differs between RTP streams (%d != %d or %d != %d). Cannot native bridge in RTP\n",
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read_ptime0, write_ptime1, read_ptime1, write_ptime0);
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return 0;
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}
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return 1;
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}
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/*! \brief Helper function which adds frame hook to bridge channel */
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static int native_rtp_bridge_framehook_attach(struct ast_bridge_channel *bridge_channel)
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{
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struct native_rtp_bridge_data *data = ao2_alloc(sizeof(*data), NULL);
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static struct ast_framehook_interface hook = {
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.version = AST_FRAMEHOOK_INTERFACE_VERSION,
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.event_cb = native_rtp_framehook,
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};
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if (!data) {
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return -1;
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}
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ast_channel_lock(bridge_channel->chan);
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if (!(data->id = ast_framehook_attach(bridge_channel->chan, &hook)) < 0) {
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ast_channel_unlock(bridge_channel->chan);
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ao2_cleanup(data);
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return -1;
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}
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ast_channel_unlock(bridge_channel->chan);
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bridge_channel->bridge_pvt = data;
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return 0;
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}
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/*! \brief Helper function which removes frame hook from bridge channel */
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static void native_rtp_bridge_framehook_detach(struct ast_bridge_channel *bridge_channel)
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{
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RAII_VAR(struct native_rtp_bridge_data *, data, bridge_channel->bridge_pvt, ao2_cleanup);
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if (!data) {
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return;
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}
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ast_channel_lock(bridge_channel->chan);
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ast_framehook_detach(bridge_channel->chan, data->id);
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ast_channel_unlock(bridge_channel->chan);
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bridge_channel->bridge_pvt = NULL;
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}
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static int native_rtp_bridge_join(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel)
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{
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struct ast_bridge_channel *c0 = AST_LIST_FIRST(&bridge->channels);
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struct ast_bridge_channel *c1 = 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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struct ast_rtp_instance *instance0 = NULL, *instance1 = NULL, *vinstance0 = NULL;
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struct ast_rtp_instance *vinstance1 = NULL, *tinstance0 = NULL, *tinstance1 = NULL;
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RAII_VAR(struct ast_format_cap *, cap0, ast_format_cap_alloc_nolock(), ast_format_cap_destroy);
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RAII_VAR(struct ast_format_cap *, cap1, ast_format_cap_alloc_nolock(), ast_format_cap_destroy);
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native_rtp_bridge_framehook_detach(c0);
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if (native_rtp_bridge_framehook_attach(c0)) {
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return -1;
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}
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native_rtp_bridge_framehook_detach(c1);
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if (native_rtp_bridge_framehook_attach(c1)) {
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native_rtp_bridge_framehook_detach(c0);
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return -1;
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}
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native_type = native_rtp_bridge_get(c0->chan, c1->chan, &glue0, &glue1, &instance0, &instance1, &vinstance0, &vinstance1);
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if (glue0->get_codec) {
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glue0->get_codec(c0->chan, cap0);
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}
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if (glue1->get_codec) {
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glue1->get_codec(c1->chan, cap1);
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}
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if (native_type == 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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} else {
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glue0->update_peer(c0->chan, instance1, vinstance1, tinstance1, cap1, 0);
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glue1->update_peer(c1->chan, instance0, vinstance0, tinstance0, cap0, 0);
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}
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return 0;
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}
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static void native_rtp_bridge_unsuspend(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel)
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{
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native_rtp_bridge_join(bridge, bridge_channel);
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}
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static void native_rtp_bridge_leave(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel)
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{
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struct ast_bridge_channel *c0 = AST_LIST_FIRST(&bridge->channels) ? AST_LIST_FIRST(&bridge->channels) : bridge_channel;
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struct ast_bridge_channel *c1 = 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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struct ast_rtp_instance *instance0 = NULL, *instance1 = NULL, *vinstance0 = NULL, *vinstance1 = NULL;
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native_rtp_bridge_framehook_detach(c0);
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if (c1) {
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native_rtp_bridge_framehook_detach(c1);
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}
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native_type = native_rtp_bridge_get(c0->chan, c1 ? c1->chan : NULL, &glue0, &glue1, &instance0, &instance1, &vinstance0, &vinstance1);
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if (native_type == 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, instance1);
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if (instance1) {
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ast_rtp_instance_set_bridged(instance1, instance0);
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}
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} else {
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glue0->update_peer(c0->chan, NULL, NULL, NULL, NULL, 0);
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if (glue1) {
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glue1->update_peer(c1->chan, NULL, NULL, NULL, NULL, 0);
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}
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}
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}
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static int native_rtp_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 = ast_bridge_channel_peer(bridge_channel);
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if (!other) {
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return -1;
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}
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/* The bridging core takes care of freeing the passed in frame. */
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ast_bridge_channel_queue_frame(other, frame);
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return 0;
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}
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static struct ast_bridge_technology native_rtp_bridge = {
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.name = "native_rtp",
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.capabilities = AST_BRIDGE_CAPABILITY_NATIVE,
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.preference = AST_BRIDGE_PREFERENCE_BASE_NATIVE,
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.join = native_rtp_bridge_join,
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.unsuspend = native_rtp_bridge_unsuspend,
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.leave = native_rtp_bridge_leave,
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.suspend = native_rtp_bridge_leave,
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.write = native_rtp_bridge_write,
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.compatible = native_rtp_bridge_compatible,
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};
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|
|
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static int unload_module(void)
|
|
{
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ast_format_cap_destroy(native_rtp_bridge.format_capabilities);
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return ast_bridge_technology_unregister(&native_rtp_bridge);
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|
}
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|
|
|
static int load_module(void)
|
|
{
|
|
if (!(native_rtp_bridge.format_capabilities = ast_format_cap_alloc())) {
|
|
return AST_MODULE_LOAD_DECLINE;
|
|
}
|
|
ast_format_cap_add_all_by_type(native_rtp_bridge.format_capabilities, AST_FORMAT_TYPE_AUDIO);
|
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ast_format_cap_add_all_by_type(native_rtp_bridge.format_capabilities, AST_FORMAT_TYPE_VIDEO);
|
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ast_format_cap_add_all_by_type(native_rtp_bridge.format_capabilities, AST_FORMAT_TYPE_TEXT);
|
|
|
|
return ast_bridge_technology_register(&native_rtp_bridge);
|
|
}
|
|
|
|
AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Native RTP bridging module");
|