Integrated preliminary implementation of Device class with monitoring of

v4l2 device connected to the machine using GstDeviceMonitor.

DeviceSource.h

@@ -1,35 +1,62 @@
 #ifndef DEVICESOURCE_H
 #define DEVICESOURCE_H
 
+#include <vector>
+
+#include "GstToolkit.h"
 #include "StreamSource.h"
 
-class Device : public Stream
+class Device
 {
+    Device();
+    Device(Rendering const& copy);            // Not Implemented
+    Device& operator=(Rendering const& copy); // Not Implemented
+
 public:
 
-    Device();
-    void open( uint deviceid );
+    static Device& manager()
+    {
+        // The only instance
+        static Device _instance;
+        return _instance;
+    }
 
-    glm::ivec2 resolution();
+    int numDevices () const;
+    std::string name (int index) const;
+    bool exists (const std::string &device) const;
+
+    std::string pipeline (int index) const;
+    std::string pipeline (const std::string &device) const;
+
+    static gboolean callback_device_monitor (GstBus *, GstMessage *, gpointer);
 
 private:
-    uint device_;
+
+    void remove(const char *device);
+    std::vector< std::string > names_;
+    std::vector< std::string > pipelines_;
+    GstDeviceMonitor *monitor_;
 };
 
+
 class DeviceSource : public StreamSource
 {
 public:
     DeviceSource();
 
     // Source interface
+    bool failed() const override;
     void accept (Visitor& v) override;
 
     // StreamSource interface
     Stream *stream() const override { return stream_; }
 
     // specific interface
-    Device *device() const;
-    void setDevice(int id);
+    void setDevice(const std::string &devicename);
+    inline std::string device() const { return device_; }
+
+private:
+    std::string device_;
 
 };