IMultiTrack: Implement a function to disable audio or video

src/Backend/IMultiTrack.h

@@ -24,6 +24,7 @@
 #define IMULTITRACK_H
 
 #include "IInput.h"
+#include "ITrack.h"
 
 namespace Backend
 {
@@ -44,6 +45,7 @@ namespace Backend
         virtual void        addTransition( ITransition& transition, int aTrack = 0, int bTrack = 1 ) = 0;
         virtual void        addFilter( IFilter& filter, int track = 0 ) = 0;
         virtual bool        connect( IInput& input ) = 0;
+        virtual void        hide( HideType hideType, int index ) = 0;
     };
 }
 

src/Backend/MLT/MLTMultiTrack.cpp

@@ -139,3 +139,11 @@ MLTMultiTrack::connect( Backend::IInput& input )
     assert( mltInput );
     return !tractor()->connect( *mltInput->producer() );
 }
+
+void
+MLTMultiTrack::hide( Backend::HideType hydeType, int index )
+{
+    auto prod = tractor()->track( index );
+    if ( prod )
+        prod->set( "hide", static_cast<int>( hydeType ) );
+}

src/Backend/MLT/MLTMultiTrack.h

@@ -58,6 +58,7 @@ namespace MLT
         virtual void        addTransition( ITransition& transition, int aTrack, int bTrack ) override;
         virtual void        addFilter( IFilter& filter, int track ) override;
         virtual bool        connect( IInput& input ) override;
+        virtual void        hide( HideType hideType, int index ) override;
 
     private:
         Mlt::Tractor*      m_tractor;