private static bool IsCaptionStream(IDictionary <string, string> streamAttributes)
{
StreamType result;
string type = streamAttributes.GetEntryIgnoreCase(TypeAttribute);
string subType = streamAttributes.GetEntryIgnoreCase(SubTypeAttribute);
#if SILVERLIGHT3
return(SystemExtensions.TryParse(type, true, out result)
#else
return Enum.TryParse(type, true, out result)
#endif
&& result == StreamType.Text &&
AllowedCaptionStreamSubTypes.Any(i => string.Equals(i, subType, StringComparison.CurrentCultureIgnoreCase)));
}