public static bool TryRegisterExtension(string extenstion, MediaFileStream implementation)
{
if (string.IsNullOrWhiteSpace(extenstion))
{
return(false);
}
if (extenstion[0] == (char)Common.ASCII.Period)
{
extenstion = extenstion.Substring(1);
}
try
{
m_ExtensionMap.Add(extenstion, implementation);
return(true);
}
catch
{
return(false);
}
}
static Type[] ConstructorTypes = new Type[] { typeof(Microsoft.Win32.SafeHandles.SafeFileHandle), typeof(System.Uri), typeof(System.IO.FileAccess), typeof(bool), typeof(System.Action) }; //new Type[] { typeof(string), typeof(System.IO.FileAccess) };
public static MediaFileStream GetCompatbileImplementation(string fileName, AppDomain domain = null, System.IO.FileMode mode = System.IO.FileMode.Open, System.IO.FileAccess access = System.IO.FileAccess.ReadWrite)
{
if (string.IsNullOrWhiteSpace(fileName))
{
throw new ArgumentNullException("fileName");
}
//Determine if to use Extension first?
//object[] args = new object[] { fileName };
System.IO.FileStream fs = new System.IO.FileStream(fileName, mode, access);
object[] args = null;
bool final = false;
Action sharedFinalizer = null;
sharedFinalizer = () =>
{
if (false == final)
{
return;
}
if (fs != null)
{
fs.Dispose();
fs = null;
}
if (args != null)
{
args = null;
}
if (sharedFinalizer != null)
{
sharedFinalizer = null;
}
};
args = new object[] { fs, new System.Uri(fileName), access, false, sharedFinalizer };
//Get all loaded assemblies in the current application domain
foreach (var assembly in (domain ?? AppDomain.CurrentDomain).GetAssemblies())
{
//Iterate each derived type which is a SubClassOf RtcpPacket.
foreach (var derivedType in assembly.GetTypes().Where(t => false == t.IsAbstract && t.IsSubclassOf(MediaFileStreamType)))
{
//OrderBy where the Type.Extensions has an element which corresponds to the extension of the fileName.
//If the derivedType is an abstraction then add to the AbstractionBag and continue
//if (derivedType.IsAbstract) continue;
MediaFileStream created = (MediaFileStream)derivedType.GetConstructor(ConstructorTypes).Invoke(args);
using (var rootNode = created.Root)
if (rootNode != null && rootNode.IsComplete)
{
args = null;
//Ensure the finalizer can now run.
final = true;
return(created);
}
//The created MediaFileStream is useless for this type of file.
created.Dispose();
//Seek back
fs.Seek(0, System.IO.SeekOrigin.Begin);
}
}
fs.Dispose();
fs = null;
args = null;
return(null);
}