TCP: Add config for WebRTC over TCP.

trunk/conf/full.conf

@@ -302,6 +302,17 @@ rtc_server {
     # The udp listen port, we will reuse it for connections.
     # default: 8000
     listen 8000;
+    # For WebRTC over TCP directly, not TURN, see https://github.com/ossrs/srs/issues/2852
+    # Some network does not support UDP, or not very well, so we use TCP like HTTP/80 port for firewall traversing.
+    tcp {
+        # Whether enable WebRTC over TCP.
+        # Default: off
+        enabled off;
+        # The TCP listen port for WebRTC. Highly recommend is some normally used ports, such as TCP/80, TCP/443,
+        # TCP/8000, TCP/8080 etc. However SRS default to TCP/8000 corresponding to UDP/8000.
+        # Default: 8000
+        listen 8000;
+    }
     # The exposed candidate IPs, response in SDP candidate line. It can be:
     #       *           Retrieve server IP automatically, from all network interfaces.
     #       $CANDIDATE  Read the IP from ENV variable, use * if not set.
@@ -315,6 +326,11 @@ rtc_server {
     # Note that browser might fail if no CANDIDATE specified.
     # Default: on
     use_auto_detect_network_ip on;
+    # The protocol for candidate to use, it can be:
+    #       udp         Generate UDP candidates. Note that UDP server is always enabled for WebRTC.
+    #       tcp         Generate TCP candidates. Fail if rtc_server.tcp(WebRTC over TCP) is disabled.
+    #       all         Generate UDP+TCP candidates. Ignore if rtc_server.tcp(WebRTC over TCP) is disabled.
+    protocol udp;
     # The IP family filter for auto discover candidate, it can be:
     #       ipv4        Filter IP v4 candidates.
     #       ipv6        Filter IP v6 candidates.