In the old times media formats were represented using a bit field. This was fast but had a few limitations. 1. Asterisk was limited in how many formats it could handle. 2. Formats, being a bit field, could not include any attribute information. A format was strictly its type, e.g., "this is ulaw". This was changed in Asterisk 10 (see https://wiki.asterisk.org/wiki/display/AST/Media+Architecture+Proposal for notes on that work) which led to the creation of the ast_format structure. This structure allowed Asterisk to handle attributes and bundle information with a format. Additionally, ast_format_cap was created to act as a container for multiple formats that, together, formed the capability of some entity. Another mechanism was added to allow logic to be registered which performed format attribute negotiation. Everywhere throughout the codebase Asterisk was changed to use this strategy. Unfortunately, in software, there is no free lunch. These new capabilities came at a cost. Performance analysis and profiling showed that we spend an inordinate amount of time comparing, copying, and generally manipulating formats and their related structures. Basic prototyping has shown that a reasonably large performance improvement could be made in this area. This patch is the result of that project, which overhauled the media format architecture and its usage in Asterisk to improve performance. Generally, the new philosophy for handling formats is as follows: * The ast_format structure is reference counted. This removed a large amount of the memory allocations and copying that was done in prior versions. * In order to prevent race conditions while keeping things performant, the ast_format structure is immutable by convention and lock-free. Violate this tenet at your peril! * Because formats are reference counted, codecs are also reference counted. The Asterisk core generally provides built-in codecs and caches the ast_format structures created to represent them. Generally, to prevent inordinate amounts of module reference bumping, codecs and formats can be added at run-time but cannot be removed. * All compatibility with the bit field representation of codecs/formats has been moved to a compatibility API. The primary user of this representation is chan_iax2, which must continue to maintain its bit-field usage of formats for interoperability concerns. * When a format is negotiated with attributes, or when a format cannot be represented by one of the cached formats, a new format object is created or cloned from an existing format. That format may have the same codec underlying it, but is a different format than a version of the format with different attributes or without attributes. * While formats are reference counted objects, the reference count maintained on the format should be manipulated with care. Formats are generally cached and will persist for the lifetime of Asterisk and do not explicitly need to have their lifetime modified. An exception to this is when the user of a format does not know where the format came from *and* the user may outlive the provider of the format. This occurs, for example, when a format is read from a channel: the channel may have a format with attributes (hence, non-cached) and the user of the format may last longer than the channel (if the reference to the channel is released prior to the format's reference). For more information on this work, see the API design notes: https://wiki.asterisk.org/wiki/display/AST/Media+Format+Rewrite Finally, this work was the culmination of a large number of developer's efforts. Extra thanks goes to Corey Farrell, who took on a large amount of the work in the Asterisk core, chan_sip, and was an invaluable resource in peer reviews throughout this project. There were a substantial number of patches contributed during this work; the following issues/patch names simply reflect some of the work (and will cause the release scripts to give attribution to the individuals who work on them). Reviews: https://reviewboard.asterisk.org/r/3814 https://reviewboard.asterisk.org/r/3808 https://reviewboard.asterisk.org/r/3805 https://reviewboard.asterisk.org/r/3803 https://reviewboard.asterisk.org/r/3801 https://reviewboard.asterisk.org/r/3798 https://reviewboard.asterisk.org/r/3800 https://reviewboard.asterisk.org/r/3794 https://reviewboard.asterisk.org/r/3793 https://reviewboard.asterisk.org/r/3792 https://reviewboard.asterisk.org/r/3791 https://reviewboard.asterisk.org/r/3790 https://reviewboard.asterisk.org/r/3789 https://reviewboard.asterisk.org/r/3788 https://reviewboard.asterisk.org/r/3787 https://reviewboard.asterisk.org/r/3786 https://reviewboard.asterisk.org/r/3784 https://reviewboard.asterisk.org/r/3783 https://reviewboard.asterisk.org/r/3778 https://reviewboard.asterisk.org/r/3774 https://reviewboard.asterisk.org/r/3775 https://reviewboard.asterisk.org/r/3772 https://reviewboard.asterisk.org/r/3761 https://reviewboard.asterisk.org/r/3754 https://reviewboard.asterisk.org/r/3753 https://reviewboard.asterisk.org/r/3751 https://reviewboard.asterisk.org/r/3750 https://reviewboard.asterisk.org/r/3748 https://reviewboard.asterisk.org/r/3747 https://reviewboard.asterisk.org/r/3746 https://reviewboard.asterisk.org/r/3742 https://reviewboard.asterisk.org/r/3740 https://reviewboard.asterisk.org/r/3739 https://reviewboard.asterisk.org/r/3738 https://reviewboard.asterisk.org/r/3737 https://reviewboard.asterisk.org/r/3736 https://reviewboard.asterisk.org/r/3734 https://reviewboard.asterisk.org/r/3722 https://reviewboard.asterisk.org/r/3713 https://reviewboard.asterisk.org/r/3703 https://reviewboard.asterisk.org/r/3689 https://reviewboard.asterisk.org/r/3687 https://reviewboard.asterisk.org/r/3674 https://reviewboard.asterisk.org/r/3671 https://reviewboard.asterisk.org/r/3667 https://reviewboard.asterisk.org/r/3665 https://reviewboard.asterisk.org/r/3625 https://reviewboard.asterisk.org/r/3602 https://reviewboard.asterisk.org/r/3519 https://reviewboard.asterisk.org/r/3518 https://reviewboard.asterisk.org/r/3516 https://reviewboard.asterisk.org/r/3515 https://reviewboard.asterisk.org/r/3512 https://reviewboard.asterisk.org/r/3506 https://reviewboard.asterisk.org/r/3413 https://reviewboard.asterisk.org/r/3410 https://reviewboard.asterisk.org/r/3387 https://reviewboard.asterisk.org/r/3388 https://reviewboard.asterisk.org/r/3389 https://reviewboard.asterisk.org/r/3390 https://reviewboard.asterisk.org/r/3321 https://reviewboard.asterisk.org/r/3320 https://reviewboard.asterisk.org/r/3319 https://reviewboard.asterisk.org/r/3318 https://reviewboard.asterisk.org/r/3266 https://reviewboard.asterisk.org/r/3265 https://reviewboard.asterisk.org/r/3234 https://reviewboard.asterisk.org/r/3178 ASTERISK-23114 #close Reported by: mjordan media_formats_translation_core.diff uploaded by kharwell (License 6464) rb3506.diff uploaded by mjordan (License 6283) media_format_app_file.diff uploaded by kharwell (License 6464) misc-2.diff uploaded by file (License 5000) chan_mild-3.diff uploaded by file (License 5000) chan_obscure.diff uploaded by file (License 5000) jingle.diff uploaded by file (License 5000) funcs.diff uploaded by file (License 5000) formats.diff uploaded by file (License 5000) core.diff uploaded by file (License 5000) bridges.diff uploaded by file (License 5000) mf-codecs-2.diff uploaded by file (License 5000) mf-app_fax.diff uploaded by file (License 5000) mf-apps-3.diff uploaded by file (License 5000) media-formats-3.diff uploaded by file (License 5000) ASTERISK-23715 rb3713.patch uploaded by coreyfarrell (License 5909) rb3689.patch uploaded by mjordan (License 6283) ASTERISK-23957 rb3722.patch uploaded by mjordan (License 6283) mf-attributes-3.diff uploaded by file (License 5000) ASTERISK-23958 Tested by: jrose rb3822.patch uploaded by coreyfarrell (License 5909) rb3800.patch uploaded by jrose (License 6182) chan_sip.diff uploaded by mjordan (License 6283) rb3747.patch uploaded by jrose (License 6182) ASTERISK-23959 #close Tested by: sgriepentrog, mjordan, coreyfarrell sip_cleanup.diff uploaded by opticron (License 6273) chan_sip_caps.diff uploaded by mjordan (License 6283) rb3751.patch uploaded by coreyfarrell (License 5909) chan_sip-3.diff uploaded by file (License 5000) ASTERISK-23960 #close Tested by: opticron direct_media.diff uploaded by opticron (License 6273) pjsip-direct-media.diff uploaded by file (License 5000) format_cap_remove.diff uploaded by opticron (License 6273) media_format_fixes.diff uploaded by opticron (License 6273) chan_pjsip-2.diff uploaded by file (License 5000) ASTERISK-23966 #close Tested by: rmudgett rb3803.patch uploaded by rmudgetti (License 5621) chan_dahdi.diff uploaded by file (License 5000) ASTERISK-24064 #close Tested by: coreyfarrell, mjordan, opticron, file, rmudgett, sgriepentrog, jrose rb3814.patch uploaded by rmudgett (License 5621) moh_cleanup.diff uploaded by opticron (License 6273) bridge_leak.diff uploaded by opticron (License 6273) translate.diff uploaded by file (License 5000) rb3795.patch uploaded by rmudgett (License 5621) tls_fix.diff uploaded by mjordan (License 6283) fax-mf-fix-2.diff uploaded by file (License 5000) rtp_transfer_stuff uploaded by mjordan (License 6283) rb3787.patch uploaded by rmudgett (License 5621) media-formats-explicit-translate-format-3.diff uploaded by file (License 5000) format_cache_case_fix.diff uploaded by opticron (License 6273) rb3774.patch uploaded by rmudgett (License 5621) rb3775.patch uploaded by rmudgett (License 5621) rtp_engine_fix.diff uploaded by opticron (License 6273) rtp_crash_fix.diff uploaded by opticron (License 6273) rb3753.patch uploaded by mjordan (License 6283) rb3750.patch uploaded by mjordan (License 6283) rb3748.patch uploaded by rmudgett (License 5621) media_format_fixes.diff uploaded by opticron (License 6273) rb3740.patch uploaded by mjordan (License 6283) rb3739.patch uploaded by mjordan (License 6283) rb3734.patch uploaded by mjordan (License 6283) rb3689.patch uploaded by mjordan (License 6283) rb3674.patch uploaded by coreyfarrell (License 5909) rb3671.patch uploaded by coreyfarrell (License 5909) rb3667.patch uploaded by coreyfarrell (License 5909) rb3665.patch uploaded by mjordan (License 6283) rb3625.patch uploaded by coreyfarrell (License 5909) rb3602.patch uploaded by coreyfarrell (License 5909) format_compatibility-2.diff uploaded by file (License 5000) core.diff uploaded by file (License 5000) git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@419044 65c4cc65-6c06-0410-ace0-fbb531ad65f3
537 lines
19 KiB
C
537 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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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/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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};
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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 *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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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 (c0 == c1) {
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return;
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}
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ast_channel_lock_both(c0->chan, c1->chan);
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native_type = native_rtp_bridge_get(c0->chan, c1->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_debug(2, "Locally RTP bridged '%s' and '%s' in stack\n",
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ast_channel_name(c0->chan), ast_channel_name(c1->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(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 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(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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ast_debug(2, "Remotely bridged '%s' and '%s' - media will flow directly between them\n",
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ast_channel_name(c0->chan), ast_channel_name(c1->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 (c0->chan == target) {
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glue0->update_peer(c0->chan, instance1, vinstance1, tinstance1, cap1, 0);
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} else {
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glue1->update_peer(c1->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(c0->chan);
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ast_channel_unlock(c1->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 *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 = 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 (c0 == c1) {
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return;
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}
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if (!c0 || !c1) {
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return;
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}
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ast_channel_lock_both(c0->chan, c1->chan);
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native_type = native_rtp_bridge_get(c0->chan, c1->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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if (ast_channel_is_leaving_bridge(c0->chan)) {
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glue0->update_peer(c0->chan, NULL, NULL, NULL, NULL, 0);
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}
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if (glue1 && ast_channel_is_leaving_bridge(c1->chan)) {
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glue1->update_peer(c1->chan, NULL, NULL, NULL, NULL, 0);
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}
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} else {
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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 mediafrom sterisk instead of what it was previously connected to.
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*/
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if (c0->chan == target) {
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glue0->update_peer(c0->chan, NULL, NULL, NULL, NULL, 0);
|
|
} else if (glue1) {
|
|
glue1->update_peer(c1->chan, NULL, NULL, NULL, NULL, 0);
|
|
}
|
|
}
|
|
break;
|
|
case AST_RTP_GLUE_RESULT_FORBID:
|
|
break;
|
|
}
|
|
|
|
ast_debug(2, "Discontinued RTP bridging of '%s' and '%s' - media will flow through Asterisk core\n",
|
|
ast_channel_name(c0->chan), ast_channel_name(c1->chan));
|
|
|
|
ast_channel_unlock(c0->chan);
|
|
ast_channel_unlock(c1->chan);
|
|
}
|
|
|
|
/*! \brief Frame hook that is called to intercept hold/unhold */
|
|
static struct ast_frame *native_rtp_framehook(struct ast_channel *chan, struct ast_frame *f, enum ast_framehook_event event, void *data)
|
|
{
|
|
RAII_VAR(struct ast_bridge *, bridge, NULL, ao2_cleanup);
|
|
|
|
if (!f || (event != AST_FRAMEHOOK_EVENT_WRITE)) {
|
|
return f;
|
|
}
|
|
|
|
bridge = ast_channel_get_bridge(chan);
|
|
|
|
if (bridge) {
|
|
/* native_rtp_bridge_start/stop are not being called from bridging
|
|
core so we need to lock the bridge prior to calling these functions
|
|
Unfortunately that means unlocking the channel, but as it
|
|
should not be modified this should be okay...hopefully */
|
|
ast_channel_unlock(chan);
|
|
ast_bridge_lock(bridge);
|
|
if (f->subclass.integer == AST_CONTROL_HOLD) {
|
|
native_rtp_bridge_stop(bridge, chan);
|
|
} else if ((f->subclass.integer == AST_CONTROL_UNHOLD) || (f->subclass.integer == AST_CONTROL_UPDATE_RTP_PEER)) {
|
|
native_rtp_bridge_start(bridge, chan);
|
|
}
|
|
ast_bridge_unlock(bridge);
|
|
ast_channel_lock(chan);
|
|
|
|
}
|
|
|
|
return f;
|
|
}
|
|
|
|
/*! \brief Callback function which informs upstream if we are consuming a frame of a specific type */
|
|
static int native_rtp_framehook_consume(void *data, enum ast_frame_type type)
|
|
{
|
|
return (type == AST_FRAME_CONTROL ? 1 : 0);
|
|
}
|
|
|
|
/*! \brief Internal helper function which checks whether the channels are compatible with our native bridging */
|
|
static int native_rtp_bridge_capable(struct ast_channel *chan)
|
|
{
|
|
return !ast_channel_has_hook_requiring_audio(chan);
|
|
}
|
|
|
|
static int native_rtp_bridge_compatible(struct ast_bridge *bridge)
|
|
{
|
|
struct ast_bridge_channel *c0 = AST_LIST_FIRST(&bridge->channels);
|
|
struct ast_bridge_channel *c1 = AST_LIST_LAST(&bridge->channels);
|
|
enum ast_rtp_glue_result native_type;
|
|
struct ast_rtp_glue *glue0, *glue1;
|
|
RAII_VAR(struct ast_rtp_instance *, instance0, NULL, ao2_cleanup);
|
|
RAII_VAR(struct ast_rtp_instance *, instance1, NULL, ao2_cleanup);
|
|
RAII_VAR(struct ast_rtp_instance *, vinstance0, NULL, ao2_cleanup);
|
|
RAII_VAR(struct ast_rtp_instance *, vinstance1, NULL, ao2_cleanup);
|
|
RAII_VAR(struct ast_format_cap *, cap0, ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT), ao2_cleanup);
|
|
RAII_VAR(struct ast_format_cap *, cap1, ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT), ao2_cleanup);
|
|
int read_ptime0, read_ptime1, write_ptime0, write_ptime1;
|
|
|
|
/* We require two channels before even considering native bridging */
|
|
if (bridge->num_channels != 2) {
|
|
ast_debug(1, "Bridge '%s' can not use native RTP bridge as two channels are required\n",
|
|
bridge->uniqueid);
|
|
return 0;
|
|
}
|
|
|
|
if (!native_rtp_bridge_capable(c0->chan)) {
|
|
ast_debug(1, "Bridge '%s' can not use native RTP bridge as channel '%s' has features which prevent it\n",
|
|
bridge->uniqueid, ast_channel_name(c0->chan));
|
|
return 0;
|
|
}
|
|
|
|
if (!native_rtp_bridge_capable(c1->chan)) {
|
|
ast_debug(1, "Bridge '%s' can not use native RTP bridge as channel '%s' has features which prevent it\n",
|
|
bridge->uniqueid, ast_channel_name(c1->chan));
|
|
return 0;
|
|
}
|
|
|
|
if ((native_type = native_rtp_bridge_get(c0->chan, c1->chan, &glue0, &glue1, &instance0, &instance1, &vinstance0, &vinstance1))
|
|
== AST_RTP_GLUE_RESULT_FORBID) {
|
|
ast_debug(1, "Bridge '%s' can not use native RTP bridge as it was forbidden while getting details\n",
|
|
bridge->uniqueid);
|
|
return 0;
|
|
}
|
|
|
|
if (ao2_container_count(c0->features->dtmf_hooks) && ast_rtp_instance_dtmf_mode_get(instance0)) {
|
|
ast_debug(1, "Bridge '%s' can not use native RTP bridge as channel '%s' has DTMF hooks\n",
|
|
bridge->uniqueid, ast_channel_name(c0->chan));
|
|
return 0;
|
|
}
|
|
|
|
if (ao2_container_count(c1->features->dtmf_hooks) && ast_rtp_instance_dtmf_mode_get(instance1)) {
|
|
ast_debug(1, "Bridge '%s' can not use native RTP bridge as channel '%s' has DTMF hooks\n",
|
|
bridge->uniqueid, ast_channel_name(c1->chan));
|
|
return 0;
|
|
}
|
|
|
|
if ((native_type == AST_RTP_GLUE_RESULT_LOCAL) && ((ast_rtp_instance_get_engine(instance0)->local_bridge !=
|
|
ast_rtp_instance_get_engine(instance1)->local_bridge) ||
|
|
(ast_rtp_instance_get_engine(instance0)->dtmf_compatible &&
|
|
!ast_rtp_instance_get_engine(instance0)->dtmf_compatible(c0->chan, instance0, c1->chan, instance1)))) {
|
|
ast_debug(1, "Bridge '%s' can not use local native RTP bridge as local bridge or DTMF is not compatible\n",
|
|
bridge->uniqueid);
|
|
return 0;
|
|
}
|
|
|
|
/* Make sure that codecs match */
|
|
if (glue0->get_codec) {
|
|
glue0->get_codec(c0->chan, cap0);
|
|
}
|
|
if (glue1->get_codec) {
|
|
glue1->get_codec(c1->chan, cap1);
|
|
}
|
|
if (ast_format_cap_count(cap0) != 0 && ast_format_cap_count(cap1) != 0 && !ast_format_cap_iscompatible(cap0, cap1)) {
|
|
struct ast_str *codec_buf0 = ast_str_alloca(64);
|
|
struct ast_str *codec_buf1 = ast_str_alloca(64);
|
|
ast_debug(1, "Channel codec0 = %s is not codec1 = %s, cannot native bridge in RTP.\n",
|
|
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(c0->chan));
|
|
read_ptime1 = ast_format_cap_get_format_framing(cap1, ast_channel_rawreadformat(c1->chan));
|
|
write_ptime0 = ast_format_cap_get_format_framing(cap0, ast_channel_rawwriteformat(c0->chan));
|
|
write_ptime1 = ast_format_cap_get_format_framing(cap1, ast_channel_rawwriteformat(c1->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,
|
|
.consume_cb = native_rtp_framehook_consume,
|
|
.disable_inheritance = 1,
|
|
};
|
|
|
|
if (!data) {
|
|
return -1;
|
|
}
|
|
|
|
ast_channel_lock(bridge_channel->chan);
|
|
data->id = ast_framehook_attach(bridge_channel->chan, &hook);
|
|
ast_channel_unlock(bridge_channel->chan);
|
|
if (data->id < 0) {
|
|
ao2_cleanup(data);
|
|
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);
|
|
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)
|
|
{
|
|
struct ast_rtp_glue *glue;
|
|
RAII_VAR(struct ast_rtp_instance *, instance, NULL, ao2_cleanup);
|
|
RAII_VAR(struct ast_rtp_instance *, vinstance, NULL, ao2_cleanup);
|
|
RAII_VAR(struct ast_rtp_instance *, tinstance, NULL, ao2_cleanup);
|
|
|
|
native_rtp_bridge_framehook_detach(bridge_channel);
|
|
|
|
glue = ast_rtp_instance_get_glue(ast_channel_tech(bridge_channel->chan)->type);
|
|
if (!glue) {
|
|
return;
|
|
}
|
|
|
|
glue->get_rtp_info(bridge_channel->chan, &instance);
|
|
|
|
if (glue->get_vrtp_info) {
|
|
glue->get_vrtp_info(bridge_channel->chan, &vinstance);
|
|
}
|
|
|
|
if (glue->get_trtp_info) {
|
|
glue->get_trtp_info(bridge_channel->chan, &tinstance);
|
|
}
|
|
|
|
/* Tear down P2P bridges */
|
|
if (instance) {
|
|
ast_rtp_instance_set_bridged(instance, NULL);
|
|
}
|
|
if (vinstance) {
|
|
ast_rtp_instance_set_bridged(vinstance, NULL);
|
|
}
|
|
if (tinstance) {
|
|
ast_rtp_instance_set_bridged(tinstance, NULL);
|
|
}
|
|
|
|
if (ast_channel_is_leaving_bridge(bridge_channel->chan)) {
|
|
/* Direct RTP may have occurred, tear it down */
|
|
glue->update_peer(bridge_channel->chan, NULL, NULL, NULL, NULL, 0);
|
|
}
|
|
|
|
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)
|
|
{
|
|
ao2_t_ref(native_rtp_bridge.format_capabilities, -1, "Dispose of capabilities in module unload");
|
|
return ast_bridge_technology_unregister(&native_rtp_bridge);
|
|
}
|
|
|
|
static int load_module(void)
|
|
{
|
|
if (!(native_rtp_bridge.format_capabilities = ast_format_cap_alloc(0))) {
|
|
return AST_MODULE_LOAD_DECLINE;
|
|
}
|
|
ast_format_cap_append_by_type(native_rtp_bridge.format_capabilities, AST_MEDIA_TYPE_AUDIO);
|
|
ast_format_cap_append_by_type(native_rtp_bridge.format_capabilities, AST_MEDIA_TYPE_VIDEO);
|
|
ast_format_cap_append_by_type(native_rtp_bridge.format_capabilities, AST_MEDIA_TYPE_TEXT);
|
|
|
|
return ast_bridge_technology_register(&native_rtp_bridge);
|
|
}
|
|
|
|
AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Native RTP bridging module");
|