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/**
* WebRTC implementation for tiny devices
*
* Copyright (c) 2022 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 TINYRTC_H
#define TINYRTC_H
/// CUSTOMIZABLE PARAMETERS ////////////////////////////////////////////////
#define TINYRTC_MAX_ICE_CANDIDATE_SIZE 256
#define TINYRTC_MAX_ICE_SERVER_CREDENTIAL_SIZE 128
#define TINYRTC_MAX_ICE_SERVERS 2
#define TINYRTC_MAX_ICE_SERVER_URL_SIZE 128
#define TINYRTC_MAX_ICE_SERVER_URLS 3
#define TINYRTC_MAX_ICE_SERVER_USERNAME_SIZE 128
#define TINYRTC_MAX_ICE_CANDIDATE_USERNAME_FRAGMENT_SIZE 8
#define TINYRTC_MAX_ICE_CANDIDATE_SDP_MID_SIZE 32
#define TINYRTC_MAX_PEER_CONNECTIONS 5
#define TINYRTC_MAX_SDP_SIZE 4096
#define TINYRTC_MAX_ICE_UFRAG_SIZE 5
#define TINYRTC_MAX_ICE_PWD_SIZE 32
/// PUBLIC ENUMS ///////////////////////////////////////////////////////////
enum rtc_session_description_type {
RTC_SESSION_DESCRIPTION_TYPE_NONE = 0,
RTC_SESSION_DESCRIPTION_TYPE_OFFER,
RTC_SESSION_DESCRIPTION_TYPE_ANSWER
};
/// PUBLIC STRUCTS /////////////////////////////////////////////////////////
struct rtc_peer_connection;
struct rtc_ice_server {
char credential[TINYRTC_MAX_ICE_SERVER_CREDENTIAL_SIZE];
char urls[TINYRTC_MAX_ICE_SERVER_URLS][TINYRTC_MAX_ICE_SERVER_URL_SIZE];
char username[TINYRTC_MAX_ICE_SERVER_USERNAME_SIZE];
};
struct rtc_configuration {
struct rtc_ice_server ice_servers[TINYRTC_MAX_ICE_SERVERS];
};
struct rtc_ice_candidate {
char candidate[TINYRTC_MAX_ICE_CANDIDATE_SIZE];
int sdp_mline_index;
char sdp_mid[TINYRTC_MAX_ICE_CANDIDATE_SDP_MID_SIZE];
char username_fragment[TINYRTC_MAX_ICE_CANDIDATE_USERNAME_FRAGMENT_SIZE];
};
struct rtc_session_description {
char sdp[TINYRTC_MAX_SDP_SIZE];
enum rtc_session_description_type type;
};
/// CALLBACKS //////////////////////////////////////////////////////////////
typedef void (rtc_on_ice_candidate)(const struct rtc_ice_candidate c,
void *arg);
/// RTC PEER CONNECTION API ////////////////////////////////////////////////
/**
* Initialize library. Must call once before calling other functions.
*/
void rtc_init();
/**
* Create new peer connection
*
* \param cfg[in] Configuration.
*
* \return Peer connection. NULL if all peer connections are already in use.
*/
struct rtc_peer_connection* rtc_peer_connection_create(
struct rtc_configuration cfg);
void rtc_peer_connection_destroy(struct rtc_peer_connection* pc);
/**
* Adds remote ICE candidate to local ICE agent
*
* \param pc[in] Peer connection.
* \param c[in] ICE candidate from remote peer.
*
* \return 0 on success. -1 on error.
*/
int rtc_add_ice_candidate(
struct rtc_peer_connection* pc, const struct rtc_ice_candidate c);
/**
* Create SDP answer in response to a received SDP offer.
*
* \param pc[in] Peer connection.
*
* \return SDP answer. NULL on error.
*/
const char* rtc_create_answer(struct rtc_peer_connection* pc);
/**
* Sets callback to call for each discovered local ICE candidate
*
* \param pc[in] Peer connection.
* \param cb[in] Callback function.
* \param arg[in] User-specified argument to pass to callback function.
*
* \return 0 on success. -1 on error.
*/
int rtc_set_on_ice_candidate(
struct rtc_peer_connection* pc, rtc_on_ice_candidate* cb, void* arg);
int rtc_set_local_description(struct rtc_peer_connection* pc, const char* sdp);
int rtc_set_remote_description(struct rtc_peer_connection* pc, const char* sdp);
#endif
/* vim: set et ts=4 sw=4 : */
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