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diff --git a/thirdparties/win32/include/directshow/pstream.h b/thirdparties/win32/include/directshow/pstream.h
new file mode 100644
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+++ b/thirdparties/win32/include/directshow/pstream.h
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+//------------------------------------------------------------------------------
+// File: PStream.h
+//
+// Desc: DirectShow base classes - defines a class for persistent properties
+//       of filters.
+//
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------------------------
+
+
+#ifndef __PSTREAM__
+#define __PSTREAM__
+
+// Base class for persistent properties of filters
+// (i.e. filter properties in saved graphs)
+
+// The simplest way to use this is:
+// 1. Arrange for your filter to inherit this class
+// 2. Implement in your class WriteToStream and ReadFromStream
+//    These will override the "do nothing" functions here.
+// 3. Change your NonDelegatingQueryInterface to handle IPersistStream
+// 4. Implement SizeMax to return the number of bytes of data you save.
+//    If you save UNICODE data, don't forget a char is 2 bytes.
+// 5. Whenever your data changes, call SetDirty()
+//
+// At some point you may decide to alter, or extend the format of your data.
+// At that point you will wish that you had a version number in all the old
+// saved graphs, so that you can tell, when you read them, whether they
+// represent the old or new form.  To assist you in this, this class
+// writes and reads a version number.
+// When it writes, it calls GetSoftwareVersion()  to enquire what version
+// of the software we have at the moment.  (In effect this is a version number
+// of the data layout in the file).  It writes this as the first thing in the data.
+// If you want to change the version, implement (override) GetSoftwareVersion().
+// It reads this from the file into mPS_dwFileVersion before calling ReadFromStream,
+// so in ReadFromStream you can check mPS_dwFileVersion to see if you are reading
+// an old version file.
+// Normally you should accept files whose version is no newer than the software
+// version that's reading them.
+
+
+// CPersistStream
+//
+// Implements IPersistStream.
+// See 'OLE Programmers Reference (Vol 1):Structured Storage Overview' for
+// more implementation information.
+class CPersistStream : public IPersistStream {
+    private:
+
+        // Internal state:
+
+    protected:
+        DWORD     mPS_dwFileVersion;         // version number of file (being read)
+        BOOL      mPS_fDirty;
+
+    public:
+
+        // IPersistStream methods
+
+        STDMETHODIMP IsDirty()
+            {return (mPS_fDirty ? S_OK : S_FALSE);}  // note FALSE means clean
+        STDMETHODIMP Load(LPSTREAM pStm);
+        STDMETHODIMP Save(LPSTREAM pStm, BOOL fClearDirty);
+        STDMETHODIMP GetSizeMax(ULARGE_INTEGER * pcbSize)
+                         // Allow 24 bytes for version.
+                         { pcbSize->QuadPart = 12*sizeof(WCHAR)+SizeMax(); return NOERROR; }
+
+        // implementation
+
+        CPersistStream(IUnknown *punk, HRESULT *phr);
+        ~CPersistStream();
+
+        HRESULT SetDirty(BOOL fDirty)
+            { mPS_fDirty = fDirty; return NOERROR;}
+
+
+        // override to reveal IPersist & IPersistStream
+        // STDMETHODIMP NonDelegatingQueryInterface(REFIID riid, void **ppv);
+
+        // --- IPersist ---
+
+        // You must override this to provide your own class id
+        STDMETHODIMP GetClassID(CLSID *pClsid) PURE;
+
+        // overrideable if you want
+        // file version number.  Override it if you ever change format
+        virtual DWORD GetSoftwareVersion(void) { return 0; }
+
+
+        //=========================================================================
+        // OVERRIDE THESE to read and write your data
+        // OVERRIDE THESE to read and write your data
+        // OVERRIDE THESE to read and write your data
+
+        virtual int SizeMax() {return 0;}
+        virtual HRESULT WriteToStream(IStream *pStream);
+        virtual HRESULT ReadFromStream(IStream *pStream);
+        //=========================================================================
+
+    private:
+
+};
+
+
+// --- Useful helpers ---
+
+
+// Writes an int to an IStream as UNICODE.
+STDAPI WriteInt(IStream *pIStream, int n);
+
+// inverse of WriteInt
+STDAPI_(int) ReadInt(IStream *pIStream, HRESULT &hr);
+
+#endif // __PSTREAM__