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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.
*/
#include <stdbool.h>
#include <stdio.h> // snprintf
#include <string.h> // memset
#include "tinyrtc.h"
/// OPAQUE TYPE DEFINITIONS ////////////////////////////////////////////////
struct trtc_peerconn_t {
bool active;
char offer[TRTC_MAX_SDP_SIZE];
char answer[TRTC_MAX_SDP_SIZE];
char l_ice_pwd[TRTC_MAX_ICE_PWD_SIZE];
char l_ice_ufrag[TRTC_MAX_ICE_UFRAG_SIZE];
};
/// STATIC ALLOCATIONS /////////////////////////////////////////////////////
static struct trtc_peerconn_t peer_connection_pool[TRTC_MAX_PEER_CONNECTIONS];
/// RTC PEER CONNECTION API ////////////////////////////////////////////////
void rtc_init() {
memset(peer_connection_pool, 0, sizeof(peer_connection_pool));
}
struct trtc_peerconn_t* trtc_peer_connection(struct trtc_config_t cfg) {
for (int i = 0; i < TRTC_MAX_PEER_CONNECTIONS; i++) {
if (!peer_connection_pool[i].active) {
memset(&peer_connection_pool[i], 0, sizeof(struct trtc_peerconn_t));
peer_connection_pool[i].active = true;
return &peer_connection_pool[i];
}
}
return NULL;
}
int trtc_add_ice_candidate(struct trtc_peerconn_t *pc, const struct trtc_ice_candidate_t c) {
return -1;
};
const char * trtc_create_answer(struct trtc_peerconn_t *pc) {
unsigned char fp[32];
snprintf(pc->l_ice_ufrag, TRTC_MAX_ICE_UFRAG_SIZE, "xxxx"); // XXX
snprintf(pc->l_ice_pwd, TRTC_MAX_ICE_PWD_SIZE, "xxxxxxxxxxxxxxxxxxxxxx"); // XXX
snprintf(pc->answer, TRTC_MAX_SDP_SIZE,
"v=0\\r\\n"
"o=- 2210401696197537454 2 IN IP4 127.0.0.1\\r\\n" // XXX
"s=-\\r\\n"
"t=0 0\\r\\n"
"a=group:BUNDLE 0\\r\\n"
"a=msid-semantic: WMS\\r\\n"
"m=video 9 UDP/TLS/RTP/SAVPF 98\\r\\n" // XXX
"c=IN IP4 0.0.0.0\\r\\n"
"a=rtcp:9 IN IP4 0.0.0.0\\r\\n"
"a=ice-ufrag:%s\\r\\n"
"a=ice-pwd:%s\\r\\n"
"a=ice-options:trickle\\r\\n"
"a=fingerprint:sha-256 "
"%02hhX:%02hhX:%02hhX:%02hhX:%02hhX:%02hhX:%02hhX:%02hhX:"
"%02hhX:%02hhX:%02hhX:%02hhX:%02hhX:%02hhX:%02hhX:%02hhX:"
"%02hhX:%02hhX:%02hhX:%02hhX:%02hhX:%02hhX:%02hhX:%02hhX:"
"%02hhX:%02hhX:%02hhX:%02hhX:%02hhX:%02hhX:%02hhX:%02hhX\\r\\n"
"a=setup:passive\\r\\n"
"a=mid:0\\r\\n"
"a=sendonly\\r\\n"
"a=rtcp-mux\\r\\n"
"a=rtcp-rsize\\r\\n"
"a=rtpmap:98 H264/90000\\r\\n"
"a=rtcp-fb:98 nack\\r\\n"
"a=rtcp-fb:98 nack pli\\r\\n"
"a=fmtp:98 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=42e01f\\r\\n",
pc->l_ice_ufrag,
pc->l_ice_pwd,
fp[ 0], fp[ 1], fp[ 2], fp[ 3], fp[ 4], fp[ 5], fp[ 6], fp[ 7],
fp[ 8], fp[ 9], fp[10], fp[11], fp[12], fp[13], fp[14], fp[15],
fp[16], fp[17], fp[18], fp[19], fp[20], fp[21], fp[22], fp[23],
fp[24], fp[25], fp[26], fp[27], fp[28], fp[29], fp[30], fp[31]
);
return pc->answer;
};
int trtc_set_local_description(struct trtc_peerconn_t *pc, const char *sdp) {
return -1;
};
int trtc_set_remote_description(struct trtc_peerconn_t *pc, const char *sdp) {
return -1;
};
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