add tools

+#!/bin/bash
+
+# check exists.
+if [[ -f /usr/local/bin/ccache ]]; then 
+    echo "ccache is ok";
+    exit 0;
+fi
+
+# check sudoer.
+sudo echo "ok" > /dev/null 2>&1; 
+ret=$?; if [[ 0 -ne ${ret} ]]; then echo "you must be sudoer"; exit 1; fi
+
+unzip ccache-3.1.9.zip && cd ccache-3.1.9 && ./configure && make
+ret=$?; if [[ $ret -ne 0 ]]; then echo "build ccache failed."; exit $ret; fi
+
+sudo cp ccache /usr/local/bin && sudo ln -s ccache /usr/local/bin/gcc && sudo ln -s ccache /usr/local/bin/g++ && sudo ln -s ccache /usr/local/bin/cc && sudo ln -s ccache /usr/local/bin/c++
+ret=$?; if [[ $ret -ne 0 ]]; then echo "install ccache failed."; exit $ret; fi

@@ -364,12 +364,23 @@ SrsSource::SrsSource(std::string _stream_url)
 
 SrsSource::~SrsSource()
 {
-	std::vector<SrsConsumer*>::iterator it;
-	for (it = consumers.begin(); it != consumers.end(); ++it) {
-		SrsConsumer* consumer = *it;
-		srs_freep(consumer);
+	if (true) {
+		std::vector<SrsConsumer*>::iterator it;
+		for (it = consumers.begin(); it != consumers.end(); ++it) {
+			SrsConsumer* consumer = *it;
+			srs_freep(consumer);
+		}
+		consumers.clear();
+	}
+
+	if (true) {
+		std::vector<SrsForwarder*>::iterator it;
+		for (it = forwarders.begin(); it != forwarders.end(); ++it) {
+			SrsForwarder* forwarder = *it;
+			srs_freep(forwarder);
+		}
+		forwarders.clear();
 	}
-	consumers.clear();
 	
 	srs_freep(cache_metadata);
 	srs_freep(cache_sh_video);

@@ -166,14 +166,16 @@ public:
 	static SrsSource* find(std::string stream_url);
 private:
 	std::string stream_url;
+	// to delivery stream to clients.
 	std::vector<SrsConsumer*> consumers;
-private:
 	// hls handler.
 #ifdef SRS_HLS
 	SrsHls* hls;
 #endif
 	// gop cache for client fast startup.
 	SrsGopCache* gop_cache;
+	// to forward stream to other servers
+	std::vector<SrsForwarder*> forwarders;
 private:
 	/**
 	* the sample rate of audio in metadata.