1 files changed, 126 insertions, 0 deletions
diff --git a/tinyrtc.c b/tinyrtc.c
new file mode 100644
index 0000000..2092224
--- /dev/null
+++ b/tinyrtc.c
@@ -0,0 +1,126 @@
+/**
+ * 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;
+};