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diff --git a/engine/cl_demosmoothing.h b/engine/cl_demosmoothing.h
new file mode 100644
index 0000000..3e2d511
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+++ b/engine/cl_demosmoothing.h
@@ -0,0 +1,191 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef CL_DEMOSMOOTHING_H
+#define CL_DEMOSMOOTHING_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "mathlib/vector.h"
+#include "quakedef.h"
+#include "tier0/platform.h"
+
+#define FDEMO_NORMAL		0
+#define FDEMO_USE_ORIGIN2	(1<<0)
+#define FDEMO_USE_ANGLES2	(1<<1)
+#define FDEMO_NOINTERP		(1<<2)	// don't interpolate between this an last view
+
+struct democmdinfo_t
+{
+	// Default constructor
+	democmdinfo_t()
+	{
+		flags = FDEMO_NORMAL;
+		viewOrigin.Init();
+		viewAngles.Init();
+		localViewAngles.Init();
+
+		// Resampled origin/angles
+		viewOrigin2.Init();
+		viewAngles2.Init();
+		localViewAngles2.Init();
+	}
+
+	// Copy constructor
+	// Assignment
+	democmdinfo_t&	operator=(const democmdinfo_t& src )
+	{
+		if ( this == &src )
+			return *this;
+
+		flags = src.flags;
+		viewOrigin = src.viewOrigin;
+		viewAngles = src.viewAngles;
+		localViewAngles = src.localViewAngles;
+		viewOrigin2 = src.viewOrigin2;
+		viewAngles2 = src.viewAngles2;
+		localViewAngles2 = src.localViewAngles2;
+
+		return *this;
+	}
+
+	const Vector& GetViewOrigin()
+	{
+		if ( flags & FDEMO_USE_ORIGIN2 )
+		{
+			return viewOrigin2;
+		}
+		return viewOrigin;
+	}
+
+	const QAngle& GetViewAngles()
+	{
+		if ( flags & FDEMO_USE_ANGLES2 )
+		{
+			return viewAngles2;
+		}
+		return viewAngles;
+	}
+	const QAngle& GetLocalViewAngles()
+	{
+		if ( flags & FDEMO_USE_ANGLES2 )
+		{
+			return localViewAngles2;
+		}
+		return localViewAngles;
+	}
+
+	void Reset( void )
+	{
+		flags = 0;
+		viewOrigin2 = viewOrigin;
+		viewAngles2 = viewAngles;
+		localViewAngles2 = localViewAngles;
+	}
+
+	int			flags;
+
+	// original origin/viewangles
+	Vector		viewOrigin;
+	QAngle		viewAngles;
+	QAngle		localViewAngles;
+
+	// Resampled origin/viewangles
+	Vector		viewOrigin2;
+	QAngle		viewAngles2;
+	QAngle		localViewAngles2;
+};
+
+struct demosmoothing_t
+{
+	demosmoothing_t()
+	{
+		file_offset = 0;
+		frametick = 0;
+		selected = false;
+		samplepoint = false;
+
+		vecmoved.Init();
+		angmoved.Init();
+
+		targetpoint = false;
+		vectarget.Init();
+	}
+
+	demosmoothing_t&	operator=(const demosmoothing_t& src )
+	{
+		if ( this == &src )
+			return *this;
+
+		file_offset = src.file_offset;
+		frametick = src.frametick;
+		selected = src.selected;
+		samplepoint = src.samplepoint;
+		vecmoved = src.vecmoved;
+		angmoved = src.angmoved;
+
+		targetpoint = src.targetpoint;
+		vectarget = src.vectarget;
+
+		info = src.info;
+
+		return *this;
+	}
+
+	int					file_offset;
+
+	int					frametick;
+
+	bool				selected;
+
+	// For moved sample points
+	bool				samplepoint;
+	Vector				vecmoved;
+	QAngle				angmoved;
+
+	bool				targetpoint;
+	Vector				vectarget;
+
+	democmdinfo_t		info;
+};
+
+struct CSmoothingContext
+{
+	CSmoothingContext()
+	{
+		active = false;
+		filename[ 0 ] = 0;
+	}
+
+	CSmoothingContext&	operator=(const CSmoothingContext& src )
+	{
+		if ( this == &src )
+			return *this;
+
+		active = src.active;
+		Q_strncpy( filename, src.filename, sizeof( filename ) );
+
+		smooth.RemoveAll();
+		int c = src.smooth.Count();
+		int i;
+		for ( i = 0; i < c; i++ )
+		{
+			demosmoothing_t newitem;
+			newitem = src.smooth[ i ];
+			smooth.AddToTail( newitem );
+		}
+
+		return *this;
+	}
+
+	bool							active;
+	char							filename[ MAX_OSPATH ];
+	CUtlVector< demosmoothing_t >	smooth;
+};
+
+#endif // CL_DEMOSMOOTHING_H