refine code:

优化 判断重复推流 及 推流流程

trunk/src/app/srs_app_source.hpp

@@ -550,13 +550,6 @@ private:
 public:
     virtual int on_aggregate(SrsCommonMessage* msg);
     /**
-    * the pre-publish is we are very sure we are
-    * trying to publish stream, please lock the resource,
-    * and we use release_publish() to release the resource.
-    */
-    virtual int acquire_publish();
-    virtual void release_publish();
-    /**
     * publish stream event notify.
     * @param _req the request from client, the source will deep copy it,
     *         for when reload the request of client maybe invalid.