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diff --git a/video/webm_common.h b/video/webm_common.h
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+++ b/video/webm_common.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// File: webm_common.h
+//
+//  WebM limits and constants shared among all QuickTime functions
+//
+//=============================================================================
+
+
+#ifndef WEBM_COMMON_H
+#define WEBM_COMMON_H
+
+#ifdef _WIN32
+#pragma once
+#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
+
+
+//-----------------------------------------------------------------------------
+// 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	// WEBM_COMMON_H