Improved user message for stream discovery failure

Stream.cpp

@@ -157,7 +157,8 @@ StreamInfo StreamDiscoverer(const std::string &description, guint w, guint h)
                 // wait for the callback_stream_discoverer to return, no more than 4 sec
                 std::mutex mtx;
                 std::unique_lock<std::mutex> lck(mtx);
-                info.discovered.wait_for(lck,std::chrono::seconds(TIMEOUT));
+                if ( info.discovered.wait_for(lck,std::chrono::seconds(TIMEOUT))  == std::cv_status::timeout)
+                    info.message = "Time out.";
 
                 // stop and delete pipeline
                 GstStateChangeReturn ret = gst_element_set_state (_pipeline, GST_STATE_NULL);
@@ -166,6 +167,8 @@ StreamInfo StreamDiscoverer(const std::string &description, guint w, guint h)
                 gst_object_unref (_pipeline);
             }
         }
+        else
+            info.message = error->message;
     }
     // at this point, the info should be filled
     return info;
@@ -631,7 +634,7 @@ void Stream::update()
                 }
                 // invalid info; fail
                 else
-                    fail("Failed to determine resolution");
+                    fail("Could not create stream: " + i.message);
             }
         }
         // wait next frame to display

Stream.h

@@ -15,13 +15,14 @@
 class Visitor;
 
 #define N_FRAME 3
-#define TIMEOUT 4
+#define TIMEOUT 5
 
 struct StreamInfo {
 
     guint width;
     guint height;
     std::condition_variable discovered;
+    std::string message;
 
     StreamInfo(guint w=0, guint h=0) {
         width = w;
@@ -31,6 +32,7 @@ struct StreamInfo {
     StreamInfo(const StreamInfo& b) {
         width = b.width;
         height = b.height;
+        message = b.message;
     }
 
     inline bool valid() { return width > 0 && height > 0; }

StreamSource.cpp

@@ -45,7 +45,7 @@ GenericStreamSource::GenericStreamSource(uint64_t id) : StreamSource(id)
 
 void GenericStreamSource::setDescription(const std::string &desc)
 {
-    gst_description_ = desc;
+    gst_description_ = BaseToolkit::unwrapped(desc);
     gst_elements_ = BaseToolkit::splitted(desc, '!');
     Log::Notify("Creating Source with Stream description '%s'", gst_description_.c_str());