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/**
* Copyright (c) 2019-2021 Chris Hiszpanski. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*/
#ifndef URTC_PEERCONN_H
#define URTC_PEERCONN_H
#include "config.h"
#include "ice.h"
#include "sdp.h"
#include "runloop.h"
#ifdef __cplusplus
extern "C" {
#endif
/**************************** TYPE DEFINITIONS ****************************/
// Event callback function type. Takes and returns void pointers.
typedef void *(*event_callback_t)(void *arg);
// Peer connection
typedef struct urtc_peerconn {
uint8_t n;
// Interactive connectivity establishment agent
ice_agent_t *agent;
// Local and remote session descriptions
urtc_sdp_t *ldesc;
urtc_sdp_t *rdesc;
// Event callbacks
void (*onIceCandidate)(const char *cand, void *arg);
void (*onIceGatheringStateChange)(int state);
void (*onIceConnectionStateChange)(int state);
void (*onSignalingStateChange)(int state);
void (*onTrack)(int track);
// Run loop for event handling
runloop_t runloop;
} urtc_peerconn_t;
/************************** FORWARD DECLARATIONS **************************/
/**
* Create a new peer connection.
*
* \param pc[out] New peer connection.
* \param cfg[in] Peer connection configuration.
*
* \return 0 on success. Negative on error.
*/
int urtc_peerconn_create(urtc_peerconn_t **pc, const urtc_config_t *cfg);
/**
* Adds received ICE candidate to ICE agent.
*
* If `cand` is a NULL pointer or empty string, it signals that all remote
* candidates have been delivered (i.e. end-of-candidates).
*
* \param pc[in] Peer connection.
* \param cand[in] ICE candidate.
*
* \return 0 on success. Negative on error.
*/
int urtc_peerconn_add_ice_candidate(urtc_peerconn_t *pc, const char *cand);
/**
* Set remote description.
*
* \param pc[in] Peer connection.
* \param desc[in] Session description protocol string.
*
* \return 0 on success. Negative on error.
*/
int urtc_peerconn_set_remote_description(urtc_peerconn_t *pc, const char *desc);
/**
* Set local description.
*
* \param pc[in] Peer connection.
* \param desc[in] Session description protocol string.
*
* \return 0 on success. Negative on error.
*/
int urtc_peerconn_set_local_description(urtc_peerconn_t *pc, const char *desc);
/**
* Create offer.
*
* \param pc[in] Peer connection.
* \param offer[out] Session description to send to remote peer. Caller must
* free.
*
* \return 0 on success. Negative on error.
*/
int urtc_peerconn_create_offer(urtc_peerconn_t *pc, char **offer);
/**
* Create answer.
*
* \param pc[in] Peer connection
* \param answer[out] Session description to send to remote peer. Caller must
* free.
*
* \return 0 on success. Negative on error.
*/
int urtc_peerconn_create_answer(urtc_peerconn_t *pc, char **answer);
/**
* Teardown a peer connection.
*
* \param pc[in] Peer connection.
*
* \return 0 on success. Negative on error.
*/
int urtc_peerconn_destroy(urtc_peerconn_t *pc);
#ifdef __cplusplus
}
#endif
#endif /* URTC_PEERCONN_H */
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