File: sdp.h

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/*! \file    sdp.h
 * \author   Lorenzo Miniero <lorenzo@meetecho.com>
 * \copyright GNU General Public License v3
 * \brief    SDP processing (headers)
 * \details  Implementation of an SDP
 * parser/merger/generator in the server. Each SDP coming from peers is
 * stripped/anonymized before it is passed to the plugins: all
 * DTLS/ICE/transport related information is removed, only leaving the
 * relevant information in place. SDP coming from plugins is stripped/anonymized
 * as well, and merged with the proper DTLS/ICE/transport information before
 * it is sent to the peers. The actual SDP processing (parsing SDP strings,
 * representation of SDP as an internal format, and so on) is done via
 * the tools provided in sdp-utils.h.
 * 
 * \todo Right now, we only support sessions with up to a single audio
 * and/or a single video stream (as in, a single audio and/or video
 * m-line) plus an optional DataChannel. Later versions of the server
 * will add support for more media streams of the same type in a session.
 * 
 * \ingroup protocols
 * \ref protocols
 */
 
#ifndef _JANUS_SDP_H
#define _JANUS_SDP_H


#include <inttypes.h>

#include "sdp-utils.h"


/** @name Janus SDP helper methods
 */
///@{
/*! \brief Method to pre-parse a session description
 * \details This method is only used to quickly check how many audio and video lines are in an SDP, and to generate a Janus SDP instance
 * @param[in] handle Opaque pointer to the ICE handle this session description will modify
 * @param[in] jsep_sdp The SDP that the browser peer originated
 * @param[in,out] error_str Buffer to receive a reason for an error, if any
 * @param[in] errlen The length of the error buffer
 * @param[out] audio The number of audio m-lines
 * @param[out] video The number of video m-lines
 * @param[out] data The number of SCTP m-lines
 * @returns The Janus SDP object in case of success, NULL in case the SDP is invalid */
janus_sdp *janus_sdp_preparse(void *handle, const char *jsep_sdp, char *error_str, size_t errlen, int *audio, int *video, int *data);

/*! \brief Method to process a parsed session description
 * \details This method will process a session description coming from a peer, and set up the ICE candidates accordingly
 * \note While this method can handle SDP updates, renegotiations are currently
 * limited to updates to the media direction of existing media streams
 * (e.g., sendrecv to recvonly) and ICE restarts. Adding/removing streams
 * and supporting multiple streams in the same PeerConnection are still WIP.
 * @param[in] handle Opaque pointer to the ICE handle this session description will modify
 * @param[in] sdp The Janus SDP object to process
 * @param[in] update Whether this SDP is an update to an existing session or not
 * @returns 0 in case of success, -1 in case of an error */
int janus_sdp_process(void *handle, janus_sdp *sdp, gboolean update);

/*! \brief Method to parse a single candidate
 * \details This method will parse a single remote candidate provided by a peer, whether it is trickling or not
 * @param[in] stream Opaque pointer to the ICE stream this candidate refers to
 * @param[in] candidate The remote candidate to process
 * @param[in] trickle Whether this is a trickle candidate, or coming from the SDP
 * @returns 0 in case of success, a non-zero integer in case of an error */
int janus_sdp_parse_candidate(void *stream, const char *candidate, int trickle);

/*! \brief Method to parse a SSRC group attribute
 * \details This method will parse a SSRC group attribute, and set the parsed values for the peer
 * @param[in] stream Opaque pointer to the ICE stream this candidate refers to
 * @param[in] group_attr The SSRC group attribute value to parse
 * @param[in] video Whether this is video-related or not
 * @returns 0 in case of success, a non-zero integer in case of an error */
int janus_sdp_parse_ssrc_group(void *stream, const char *group_attr, int video);

/*! \brief Method to parse a SSRC attribute
 * \details This method will parse a SSRC attribute, and set it for the peer
 * @param[in] stream Opaque pointer to the ICE stream this candidate refers to
 * @param[in] ssrc_attr The SSRC attribute value to parse
 * @param[in] video Whether this is a video SSRC or not
 * @returns 0 in case of success, a non-zero integer in case of an error */
int janus_sdp_parse_ssrc(void *stream, const char *ssrc_attr, int video);

/*! \brief Method to strip/anonymize a session description
 * @param[in,out] sdp The Janus SDP description object to strip/anonymize
 * @returns 0 in case of success, a non-zero integer in case of an error */
int janus_sdp_anonymize(janus_sdp *sdp);

/*! \brief Method to merge a stripped session description and the right transport information
 * @param[in] handle Opaque pointer to the ICE handle this session description is related to
 * @param[in] sdp The Janus SDP description object to merge/enrich
 * @param[in] offer Whether the SDP is an offer or an answer
 * @returns A string containing the full session description in case of success, NULL if the SDP is invalid */
char *janus_sdp_merge(void *handle, janus_sdp *sdp, gboolean offer);
///@}

#endif