1 files changed, 66 insertions, 0 deletions
diff --git a/win/CS/HandBrake.Interop/HandBrakeInterop/Helpers/Utilities.cs b/win/CS/HandBrake.Interop/HandBrakeInterop/Helpers/Utilities.cs
new file mode 100644
index 000000000..77106f72d
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+++ b/win/CS/HandBrake.Interop/HandBrakeInterop/Helpers/Utilities.cs
@@ -0,0 +1,66 @@
+// --------------------------------------------------------------------------------------------------------------------
+// <copyright file="Utilities.cs" company="HandBrake Project (http://handbrake.fr)">
+//   This file is part of the HandBrake source code - It may be used under the terms of the GNU General Public License.
+// </copyright>
+// <summary>
+//   Defines the Utilities type.
+// </summary>
+// --------------------------------------------------------------------------------------------------------------------
+
+namespace HandBrake.Interop.Helpers
+{
+    using HandBrake.Interop.Model.Encoding;
+
+    /// <summary>
+    /// The utilities.
+    /// </summary>
+    public static class Utilities
+	{
+        /// <summary>
+        /// Get the Greatest Common Factor
+        /// </summary>
+        /// <param name="a">
+        /// The a.
+        /// </param>
+        /// <param name="b">
+        /// The b.
+        /// </param>
+        /// <returns>
+        /// The greatest common factor
+        /// </returns>
+        public static int GreatestCommonFactor(int a, int b)
+		{
+			if (a == 0)
+			{
+				return b;
+			}
+
+			if (b == 0)
+			{
+				return a;
+			}
+
+			if (a > b)
+			{
+				return GreatestCommonFactor(a % b, b);
+			}
+            
+            return GreatestCommonFactor(a, b % a);
+		}
+
+		/// <summary>
+		/// Determines if the given audio encoder is a passthrough encoder choice.
+		/// </summary>
+		/// <param name="encoder">The audio encoder to examine.</param>
+		/// <returns>True if the encoder is passthrough.</returns>
+		public static bool IsPassthrough(AudioEncoder encoder)
+		{
+			return encoder == AudioEncoder.Ac3Passthrough ||
+                   encoder == AudioEncoder.DtsHDPassthrough ||
+                   encoder == AudioEncoder.DtsPassthrough ||
+                   encoder == AudioEncoder.Mp3Passthru || 
+                   encoder == AudioEncoder.AacPassthru ||
+                   encoder == AudioEncoder.Passthrough;
+		}
+	}
+}