fix the bug: when trying to push same stream more than twice, to play it through…

… http-flv will cause a core dump(#666)

@@ -78,6 +78,17 @@ SrsStreamCache::~SrsStreamCache()
     srs_freep(req);
 }
 
+int SrsStreamCache::update(SrsSource* s, SrsRequest* r)
+{
+    int ret = ERROR_SUCCESS;
+
+    srs_freep(req);
+    req = r->copy();
+    source = s;
+    
+    return ret;
+}
+
 int SrsStreamCache::start()
 {
     return pthread->start();
@@ -451,6 +462,17 @@ SrsLiveStream::~SrsLiveStream()
     srs_freep(req);
 }
 
+int SrsLiveStream::update(SrsSource* s, SrsRequest* r)
+{
+    int ret = ERROR_SUCCESS;
+
+    srs_freep(req);
+    source = s;
+    req = r->copy();
+
+    return ret;
+}
+
 int SrsLiveStream::serve_http(ISrsHttpResponseWriter* w, ISrsHttpMessage* r)
 {
     int ret = ERROR_SUCCESS;
@@ -836,6 +858,8 @@ int SrsHttpStreamServer::http_mount(SrsSource* s, SrsRequest* r)
         srs_trace("http: mount flv stream for vhost=%s, mount=%s", sid.c_str(), mount.c_str());
     } else {
         entry = sflvs[sid];
+        entry->stream->update(s, r);
+        entry->cache->update(s, r);
     }
 
     if (entry->stream) {

@@ -51,6 +51,7 @@ private:
 public:
     SrsStreamCache(SrsSource* s, SrsRequest* r);
     virtual ~SrsStreamCache();
+    virtual int update(SrsSource* s, SrsRequest* r);
 public:
     virtual int start();
     virtual int dump_cache(SrsConsumer* consumer, SrsRtmpJitterAlgorithm jitter);
@@ -227,6 +228,7 @@ private:
 public:
     SrsLiveStream(SrsSource* s, SrsRequest* r, SrsStreamCache* c);
     virtual ~SrsLiveStream();
+    virtual int update(SrsSource* s, SrsRequest* r);
 public:
     virtual int serve_http(ISrsHttpResponseWriter* w, ISrsHttpMessage* r);
 private: