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diff --git a/video/quicktime_common.h b/video/quicktime_common.h
new file mode 100644
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--- /dev/null
+++ b/video/quicktime_common.h
@@ -0,0 +1,100 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// File: quicktime_common.h
+//
+//  QuickTime limits and constants shared among all QuickTime functions
+//
+//=============================================================================
+
+
+#ifndef QUICKTIME_COMMON_H
+#define QUICKTIME_COMMON_H
+
+#ifdef _WIN32
+#pragma once
+#endif
+
+#ifdef OSX
+// The OSX 10.7 SDK dropped support for the functions below, so we manually pull them in
+#include <dlfcn.h>
+typedef PixMapHandle
+(*PFNGetGWorldPixMap)(GWorldPtr offscreenGWorld);
+typedef Ptr
+(*PFNGetPixBaseAddr)(PixMapHandle pm);
+typedef Boolean
+(*PFNLockPixels)(PixMapHandle pm);
+typedef void
+(*PFNUnlockPixels)(PixMapHandle pm);
+typedef void
+(*PFNDisposeGWorld)(GWorldPtr offscreenGWorld);
+typedef void
+(*PFNSetGWorld)(CGrafPtr   port,GDHandle   gdh);
+typedef SInt32
+(*PFNGetPixRowBytes)(PixMapHandle pm);
+
+
+extern PFNGetGWorldPixMap GetGWorldPixMap;
+extern PFNGetPixBaseAddr GetPixBaseAddr;
+extern PFNLockPixels LockPixels;
+extern PFNUnlockPixels UnlockPixels;
+extern PFNDisposeGWorld DisposeGWorld;
+extern PFNSetGWorld SetGWorld;
+extern PFNGetPixRowBytes GetPixRowBytes;
+#endif
+
+
+// constant that define the bounds of various inputs
+static const int	cMinVideoFrameWidth = 16;
+static const int	cMinVideoFrameHeight = 16;
+static const int	cMaxVideoFrameWidth = 2 * 2048;
+static const int	cMaxVideoFrameHeight = 2 * 2048;
+
+static const int	cMinFPS = 1;
+static const int	cMaxFPS = 600;
+
+static const float  cMinDuration = 0.016666666f;		// 1/60th second
+static const float  cMaxDuration = 3600.0f;				// 1 Hour
+
+static const int	cMinSampleRate = 11025;				// 1/4 CD sample rate
+static const int	cMaxSampleRate = 88200;				// 2x CD rate
+
+#define NO_MORE_INTERESTING_TIMES   -2
+#define END_OF_QUICKTIME_MOVIE		-1
+
+// ===========================================================================
+// Macros & Utility functions
+// ===========================================================================
+
+#define SAFE_DISPOSE_HANDLE( _handle )		if ( _handle != nullptr ) { DisposeHandle( (Handle) _handle ); _handle = nullptr; }
+#define SAFE_DISPOSE_GWORLD( _gworld )		if ( _gworld != nullptr ) { DisposeGWorld( _gworld ); _gworld = nullptr; }
+#define SAFE_DISPOSE_MOVIE( _movie )		if ( _movie != nullptr ) { DisposeMovie( _movie ); ThreadSleep(10); Assert( GetMoviesError() == noErr ); _movie = nullptr; }
+#define SAFE_RELEASE_AUDIOCONTEXT( _cxt )	if ( _cxt != nullptr ) { QTAudioContextRelease( _cxt ); _cxt = nullptr; }
+#define SAFE_RELEASE_CFREF( _ref )			if ( _ref != nullptr ) { CFRelease( _ref ); _ref = nullptr; }
+// Utility functions
+
+extern char *COPY_STRING( const char *pString );
+
+bool	MovieGetStaticFrameRate( Movie inMovie, VideoFrameRate_t &theFrameRate );
+
+bool	SetGWorldDecodeGamma( CGrafPtr theGWorld, VideoPlaybackGamma_t gamma );
+
+bool	CreateMovieAudioContext( bool enableAudio, Movie inMovie, QTAudioContextRef *pAudioConectext, bool setVolume = false, float *pCurrentVolume = nullptr );
+
+VideoPlaybackGamma_t GetSystemPlaybackGamma();
+
+
+//-----------------------------------------------------------------------------
+// Computes a power of two at least as big as the passed-in number
+//-----------------------------------------------------------------------------
+static inline int ComputeGreaterPowerOfTwo( int n )
+{
+	int i = 1;
+	while ( i < n )
+	{
+		i <<= 1;
+	}
+	return i;
+}
+
+
+#endif	// QUICKTIME_COMMON_H