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d6535c0080
RFC 5576 defines how SSRC-level attributes may be added to SDP media descriptions. In general, this is useful for grouping related SSRCes, indicating SSRC-level format attributes, and resolving collisions in RTP SSRC values. These attributes are used widely by browsers during WebRTC communications, including attributes defined by documents outside of RFC 5576. This commit introduces the addition of SSRC-level attributes into SDPs generated by Asterisk. Since Asterisk does not tend to use multiple SSRCs on a media stream, the initial support is minimal. Asterisk includes an SSRC-level CNAME attribute if configured to do so. This at least gives browsers (and possibly others) the ability to resolve SSRC collisions at offer-answer time. In order to facilitate this, the RTP engine API has been enhanced to be able to retrieve the SSRC and CNAME on a given RTP instance. res_rtp_asterisk currently does not provide meaningful CNAME values in its RTCP SDES items, and therefore it currently will always return an empty string as the CNAME value. A task in the near future will result in res_rtp_asterisk generating more meaningful CNAMEs. Change-Id: I29e7f23e7db77524f82a3b6e8531b1195ff57789
62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2017, Digium, Inc.
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*
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* Mark Michelson <mmichelson@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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#ifndef _MAIN_SDP_PRIVATE_H
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#define _MAIN_SDP_PRIVATE_H
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#include "asterisk/stringfields.h"
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#include "asterisk/sdp_options.h"
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struct ast_sdp_options {
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AST_DECLARE_STRING_FIELDS(
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/*! Optional media address to use in SDP */
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AST_STRING_FIELD(media_address);
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/*! SDP origin username */
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AST_STRING_FIELD(sdpowner);
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/*! SDP session name */
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AST_STRING_FIELD(sdpsession);
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/*! RTP Engine Name */
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AST_STRING_FIELD(rtp_engine);
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);
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struct {
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unsigned int bind_rtp_to_media_address : 1;
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unsigned int bind_udptl_to_media_address : 1;
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unsigned int rtp_symmetric : 1;
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unsigned int udptl_symmetric : 1;
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unsigned int telephone_event : 1;
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unsigned int rtp_ipv6 : 1;
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unsigned int g726_non_standard : 1;
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unsigned int locally_held : 1;
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unsigned int rtcp_mux: 1;
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unsigned int ssrc: 1;
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};
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struct {
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unsigned int tos_audio;
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unsigned int cos_audio;
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unsigned int tos_video;
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unsigned int cos_video;
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unsigned int udptl_far_max_datagram;
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};
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enum ast_sdp_options_ice ice;
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enum ast_sdp_options_impl impl;
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enum ast_sdp_options_encryption encryption;
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enum ast_t38_ec_modes udptl_error_correction;
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};
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#endif /* _MAIN_SDP_PRIVATE_H */
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