IInput: Add aspectRatio()

src/Backend/IInput.h

@@ -88,6 +88,7 @@ namespace Backend
         virtual uint8_t*        image( uint32_t width, uint32_t height ) const = 0;
 
         virtual double          fps() const = 0;
+        virtual double          aspectRatio() const = 0;
         virtual int             width() const = 0;
         virtual int             height() const = 0;
         virtual bool            hasVideo() const = 0;

src/Backend/MLT/MLTInput.cpp

@@ -272,6 +272,12 @@ MLTInput::fps() const
     return producer()->get_fps();
 }
 
+double
+MLTInput::aspectRatio() const
+{
+    return producer()->get_double( "aspect_ratio" );
+}
+
 int
 MLTInput::width() const
 {

src/Backend/MLT/MLTInput.h

@@ -90,6 +90,7 @@ class MLTInput : virtual public IInput, public MLTService
         virtual uint8_t*        image( uint32_t width, uint32_t height ) const override;
 
         virtual double          fps() const override;
+        virtual double          aspectRatio() const override;
         virtual int             width() const override;
         virtual int             height() const override;
         virtual bool            hasVideo() const override;