dash: Avoid some copies.

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
(cherry picked from commit f0bf352244a1ef2562baffcf42851346d3642e19)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/stream_filter/dash/http/HTTPConnection.cpp

@@ -29,7 +29,7 @@
 
 using namespace dash::http;
 
-HTTPConnection::HTTPConnection  (std::string url, stream_t *stream)
+HTTPConnection::HTTPConnection  (const std::string& url, stream_t *stream)
 {
     this->url       = url;
     this->stream    = stream;
@@ -107,7 +107,7 @@ std::string     HTTPConnection::readLine        ()
 
     return "\r\n";
 }
-bool            HTTPConnection::sendData        (std::string data)
+bool            HTTPConnection::sendData        (const std::string& data)
 {
     ssize_t size = net_Write(this->stream, this->httpSocket, NULL, data.c_str(), data.size());
     if (size == -1)

modules/stream_filter/dash/http/HTTPConnection.h

@@ -48,7 +48,7 @@ namespace dash
         class HTTPConnection : public IHTTPConnection
         {
             public:
-                HTTPConnection          (std::string url, stream_t *stream);
+                HTTPConnection          ( const std::string& url, stream_t *stream );
                 virtual ~HTTPConnection ();
 
                 bool        init            ();
@@ -67,7 +67,7 @@ namespace dash
                 stream_t                *urlStream;
 
                 void            parseURL        ();
-                bool            sendData        (std::string data);
+                bool            sendData        (const std::string& data);
                 bool            parseHeader     ();
                 std::string     readLine        ();
         };