output/Print: print the plugin name

src/output/Control.cxx

@@ -58,6 +58,12 @@ AudioOutputControl::GetName() const noexcept
 	return output->GetName();
 }
 
+const char *
+AudioOutputControl::GetPluginName() const noexcept
+{
+	return output->GetPluginName();
+}
+
 const char *
 AudioOutputControl::GetLogName() const noexcept
 {

src/output/Control.hxx

@@ -232,6 +232,9 @@ public:
 	gcc_pure
 	const char *GetName() const noexcept;
 
+	gcc_pure
+	const char *GetPluginName() const noexcept;
+
 	gcc_pure
 	const char *GetLogName() const noexcept;
 

src/output/Filtered.hxx

@@ -147,6 +147,10 @@ public:
 		return name;
 	}
 
+	const char *GetPluginName() const noexcept {
+		return plugin_name;
+	}
+
 	const char *GetLogName() const noexcept {
 		return log_name.c_str();
 	}

src/output/Print.cxx

@@ -36,7 +36,10 @@ printAudioDevices(Response &r, const MultipleOutputs &outputs)
 
 		r.Format("outputid: %u\n"
 			 "outputname: %s\n"
+			 "plugin: %s\n"
 			 "outputenabled: %i\n",
-			 i, ao.GetName(), ao.IsEnabled());
+			 i,
+			 ao.GetName(), ao.GetPluginName(),
+			 ao.IsEnabled());
 	}
 }