for #369, support RTMP 302 api at protocol level.

@@ -137,7 +137,7 @@ package
 			var ms:NetStream = this.media_stream;
 			
             if (!ms) {
-                log("stream is null, ignore timer event.");
+                //log("stream is null, ignore timer event.");
                 return;
             }
 			
@@ -395,6 +395,26 @@ package
                     }
                     update_context_items();
                 }
+				 
+				// reject by server, maybe redirect.
+				if (evt.info.code == "NetConnection.Connect.Rejected") {
+					// RTMP 302 redirect.
+					if (evt.info.hasOwnProperty("ex") && evt.info.ex.code == 302) {
+						var streamName:String = url.substr(url.lastIndexOf("/") + 1);
+						url = evt.info.ex.redirect + "/" + streamName;
+						log("Async RTMP 302 Redirect to: " + url);
+						
+						// notify server.
+						media_conn.call("Redirected", null, evt.info.ex.redirect);
+						
+						// do 302.
+						setTimeout(function(){
+							log("Async RTMP 302 Redirected.");
+							js_call_play(url, _width, _height, buffer_time, max_buffer_time, volume);
+						}, 1000);
+						return;
+					}
+				}
                 
                 // TODO: FIXME: failed event.
                 if (evt.info.code != "NetConnection.Connect.Success") {

@@ -26,7 +26,8 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 bool srs_is_system_control_error(int error_code)
 {
     return error_code == ERROR_CONTROL_RTMP_CLOSE
-        || error_code == ERROR_CONTROL_REPUBLISH;
+        || error_code == ERROR_CONTROL_REPUBLISH
+        || error_code == ERROR_CONTROL_REDIRECT;
 }
 
 bool srs_is_client_gracefully_close(int error_code)

@@ -161,6 +161,9 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 //                                           
 // system control message, 
 // not an error, but special control logic.
+//
+// connection is redirect to another server.
+#define ERROR_CONTROL_REDIRECT              2997
 // sys ctl: rtmp close stream, support replay.
 #define ERROR_CONTROL_RTMP_CLOSE            2998
 // FMLE stop publish and republish.

@@ -306,7 +306,9 @@ string srs_generate_rtmp_url(string server, int port, string vhost, string app,
         ss << "...vhost..." << vhost;
     }
     
-    ss << "/" << stream;
+    if (!stream.empty()) {
+        ss << "/" << stream;
+    }
     
     return ss.str();
 }

@@ -2575,6 +2575,57 @@ int SrsRtmpServer::response_connect_app(SrsRequest *req, const char* server_ip)
     return ret;
 }
 
+#define SRS_RTMP_REDIRECT_TIMEOUT 3000
+int SrsRtmpServer::redirect(SrsRequest* r, string host, int port, bool& accepted)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if (true) {
+        string url = srs_generate_rtmp_url(host, port, r->vhost, r->app, "");
+        
+        SrsAmf0Object* ex = SrsAmf0Any::object();
+        ex->set("code", SrsAmf0Any::number(302));
+        ex->set("redirect", SrsAmf0Any::str(url.c_str()));
+        
+        SrsOnStatusCallPacket* pkt = new SrsOnStatusCallPacket();
+        
+        pkt->data->set(StatusLevel, SrsAmf0Any::str(StatusLevelError));
+        pkt->data->set(StatusCode, SrsAmf0Any::str(StatusCodeConnectRejected));
+        pkt->data->set(StatusDescription, SrsAmf0Any::str("RTMP 302 Redirect"));
+        pkt->data->set("ex", ex);
+        
+        if ((ret = protocol->send_and_free_packet(pkt, 0)) != ERROR_SUCCESS) {
+            srs_error("send redirect/rejected message failed. ret=%d", ret);
+            return ret;
+        }
+        srs_info("send redirect/rejected message success.");
+    }
+    
+    // client must response a call message.
+    // or we never know whether the client is ok to redirect.
+    protocol->set_recv_timeout(SRS_RTMP_REDIRECT_TIMEOUT * 1000);
+    if (true) {
+        SrsCommonMessage* msg = NULL;
+        SrsCallPacket* pkt = NULL;
+        if ((ret = expect_message<SrsCallPacket>(&msg, &pkt)) != ERROR_SUCCESS) {
+            // ignore any error of redirect response.
+            return ERROR_SUCCESS;
+        }
+        SrsAutoFree(SrsCommonMessage, msg);
+        SrsAutoFree(SrsCallPacket, pkt);
+        
+        string message;
+        if (pkt->arguments && pkt->arguments->is_string()) {
+            message = pkt->arguments->to_str();
+            srs_info("confirm redirected to %s", message.c_str());
+            accepted = true;
+        }
+        srs_info("get redirect response message");
+    }
+    
+    return ret;
+}
+
 void SrsRtmpServer::response_connect_reject(SrsRequest* /*req*/, const char* desc)
 {
     int ret = ERROR_SUCCESS;

@@ -930,6 +930,12 @@ public:
      */
     virtual int response_connect_app(SrsRequest* req, const char* server_ip = NULL);
     /**
+     * redirect the connection to another rtmp server.
+     * @param the hostname or ip of target.
+     * @param whether the client accept the redirect.
+     */
+    virtual int redirect(SrsRequest* r, std::string host, int port, bool& accepted);
+    /**
      * reject the connect app request.
      */
     virtual void response_connect_reject(SrsRequest* req, const char* desc);