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Add initial SDP state code.

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This establishes the basic allocation/destruction of an SDP state
object, plus some of the simpler getter methods involved. Subsequent
tasks will deal with adding a state machine, creating SDPs from
capabilities and options, and merging SDPs into a joint SDP.

Change-Id: Ie3757ce186f04b65e9d1883f5aace53f24e53709
This commit is contained in:
Mark Michelson
2017-02-15 14:43:36 -06:00
parent 5a130b2e17
commit a738772edd
2 changed files with 165 additions and 0 deletions
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58
include/asterisk/sdp_state.h Normal file
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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2017, Digium, Inc.
*
* Mark Michelson <mmichelson@digium.com>
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
#ifndef _ASTERISK_SDP_STATE_H
#define _ASTERISK_SDP_STATE_H
struct ast_sdp_state;
struct ast_sdp_options;
struct ast_stream_topology;
/*!
* \brief Allocate a new SDP state
*
* SDP state keeps tabs on everything SDP-related for a media session.
* Most SDP operations will require the state to be provided.
* Ownership of the SDP options is taken on by the SDP state.
* A good strategy is to call this during session creation.
*/
struct ast_sdp_state *ast_sdp_state_alloc(struct ast_stream_topology *streams, struct ast_sdp_options *options);
/*!
* \brief Free the SDP state.
*
* A good strategy is to call this during session destruction
*/
void ast_sdp_state_free(struct ast_sdp_state *sdp_state);
/*!
* \brief Get the associated RTP instance for a particular stream on the SDP state.
*
* Stream numbers correspond to the streams in the topology of the associated channel
*/
struct ast_rtp_instance *ast_sdp_state_get_rtp_instance(struct ast_sdp_state *sdp_state, int stream_index);
/*!
* \brief Get the joint negotiated streams based on local and remote capabilities.
*
* If this is called prior to receiving a remote SDP, then this will just mirror
* the local configured endpoint capabilities.
*/
struct ast_stream_topology *ast_sdp_state_get_joint_topology(struct ast_sdp_state *sdp_state);
#endif /* _ASTERISK_SDP_STATE_H */