add standalone EncodingOptions

MediaBrowser.MediaEncoding/Configuration/EncodingConfigurationFactory.cs

@@ -0,0 +1,45 @@
+using MediaBrowser.Common.Configuration;
+using MediaBrowser.Model.Configuration;
+using System.Collections.Generic;
+using System.IO;
+
+namespace MediaBrowser.MediaEncoding.Configuration
+{
+    public class EncodingConfigurationFactory : IConfigurationFactory
+    {
+        public IEnumerable<ConfigurationStore> GetConfigurations()
+        {
+            return new[]
+            {
+                new EncodingConfigurationStore()
+            };
+        }
+    }
+
+    public class EncodingConfigurationStore : ConfigurationStore, IValidatingConfiguration
+    {
+        public EncodingConfigurationStore()
+        {
+            ConfigurationType = typeof(EncodingOptions);
+            Key = "encoding";
+        }
+
+        public void Validate(object oldConfig, object newConfig)
+        {
+            var oldEncodingConfig = (EncodingOptions)oldConfig;
+            var newEncodingConfig = (EncodingOptions)newConfig;
+
+            var newPath = newEncodingConfig.TranscodingTempPath;
+
+            if (!string.IsNullOrWhiteSpace(newPath)
+                && !string.Equals(oldEncodingConfig.TranscodingTempPath ?? string.Empty, newPath))
+            {
+                // Validate
+                if (!Directory.Exists(newPath))
+                {
+                    throw new DirectoryNotFoundException(string.Format("{0} does not exist.", newPath));
+                }
+            }
+        }
+    }
+}