完善seek相关的逻辑

src/Device/PlayerProxy.cpp

@@ -192,7 +192,7 @@ void PlayerProxy::initMedia() {
 //		_pChn->initAudio(info);
 //	}
 }
-bool PlayerProxy::shutDown() {
+bool PlayerProxy::close() {
     //通知其停止推流
     weak_ptr<PlayerProxy> weakSlef = dynamic_pointer_cast<PlayerProxy>(shared_from_this());
 	auto executor = getExecutor();

src/Device/PlayerProxy.h

@@ -54,7 +54,7 @@ public:
 	virtual ~PlayerProxy();
 
 	void play(const char* strUrl) override;
-    bool shutDown() override;
+    bool close() override;
 private:
 	void initMedia();
 	void rePlay(const string &strUrl,int iFailedCnt);