Bare bones demo

* ICE candidate parser
* Simple demo.html
* Outline of tinyrtc.h

1 files changed, 112 insertions, 0 deletions

diff --git a/example/main.c b/example/main.c
new file mode 100644
index 0000000..6223898
--- /dev/null
+++ b/example/main.c
@@ -0,0 +1,112 @@
+// Simple example of a mock IP camera. Answers WebRTC offer and streams H.264.
+
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "jsmn.h"
+#include "tinyrtc.h"
+
+// Helper function for parsing JSON
+static bool matches(const char *json, jsmntok_t *tok, const char *s) {
+	if (JSMN_STRING != tok->type) return false;
+	if (strlen(s) != tok->end - tok->start) return false;
+	return 0 == strncmp(json + tok->start, s, tok->end - tok->start);
+}
+
+// Parses ICE candidate from stringified JSON
+struct ice_candidate_t parse_ice_candidate(const char *s)
+{
+	struct ice_candidate_t c = { 0 };
+
+	int i, r;
+	jsmn_parser p;
+	jsmntok_t t[16];
+	jsmn_init(&p);
+
+	r = jsmn_parse(&p, s, strlen(s), t, sizeof(t) / sizeof(t[0]));
+	if (r < 0) {
+		printf("%s:%d: failed to parse json", __func__, __LINE__);
+		return c;
+	}
+
+	if (r < 1 || t[0].type != JSMN_OBJECT) {
+		printf("%s:%d: object expected", __func__, __LINE__);
+		return c;
+	}
+
+	for (i = 1; i < r; i++) {
+		if (matches(s, &t[i], "candidate")) {
+			strncpy(c.candidate, s + t[i + 1].start,
+				t[i + 1].end - t[i + 1].start);
+			i++;
+		} else if (matches(s, &t[i], "sdpMid")) {
+			strncpy(c.sdp_mid, s + t[i + 1].start,
+				t[i + 1].end - t[i + 1].start);
+			i++;
+		} else if (matches(s, &t[i], "sdpMLineIndex")) {
+			c.sdp_mline_index = atoi(s + t[i + 1].start);
+			i++;
+		} else if (matches(s, &t[i], "usernameFragment")) {
+			strncpy(c.username_fragment, s + t[i + 1].start,
+				t[i + 1].end - t[i + 1].start);
+			i++;
+		}
+	}
+
+	return c;
+}
+
+// (callback) Called for each discovered local ICE candidate
+int on_ice_candidate(const struct ice_candidate_t c, void *arg) {
+	// send ice candidate over signaling channel
+	printf("{"
+		"\"candidate\":\"%s\","
+		"\"sdpMLineIndex\":%d,"
+		"\"sdpMid\":\"%s\","
+		"\"usernameFragment\":null"
+	"}\n", c.candidate, c.sdp_mline_index, c.sdp_mid);
+
+	return 0;
+}
+
+int main(int argc, char **argv)
+{
+	// disable stdout buffering to ensure signaling messages send immediately
+	setvbuf(stdout, NULL, _IONBF, 0);
+
+	// create peer connection
+	struct configuration_t cfg = {
+		.ice_servers = {
+			{
+				.urls = {
+					"stun:stun.liburtc.org",
+				},
+			}
+		}
+	};
+	struct peerconn_t* pc = rtc_peer_connection(cfg);
+
+	printf("alert! starting\n");
+
+	while (true) {
+		int n;
+		char *m = NULL;
+		size_t len = 0;
+
+
+		if (n = getline(&m, &len, stdin), -1 == n) {
+			return -1;
+		}
+
+		struct ice_candidate_t c = parse_ice_candidate(m);
+
+		on_ice_candidate(c, NULL);
+
+		add_ice_candidate(pc, c);
+	}
+
+	return 0;
+}