diff --git a/jni/pjproject-android/third_party/BaseClasses/seekpt.h b/jni/pjproject-android/third_party/BaseClasses/seekpt.h
new file mode 100644
index 0000000..208d418
--- /dev/null
+++ b/jni/pjproject-android/third_party/BaseClasses/seekpt.h
@@ -0,0 +1,30 @@
+//------------------------------------------------------------------------------
+// File: SeekPT.h
+//
+// Desc: DirectShow base classes.
+//
+// Copyright (c) 1992-2001 Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------------------------
+
+
+#ifndef __seekpt_h__
+#define __seekpt_h__
+
+
+class CSeekingPassThru : public ISeekingPassThru, public CUnknown
+{
+public:
+    static CUnknown *CreateInstance(__inout_opt LPUNKNOWN pUnk, __inout HRESULT *phr);
+    CSeekingPassThru(__in_opt LPCTSTR pName, __inout_opt LPUNKNOWN pUnk, __inout HRESULT *phr);
+    ~CSeekingPassThru();
+
+    DECLARE_IUNKNOWN;
+    STDMETHODIMP NonDelegatingQueryInterface(REFIID riid, __deref_out void ** ppv);
+
+    STDMETHODIMP Init(BOOL bSupportRendering, IPin *pPin);
+
+private:
+    CPosPassThru              *m_pPosPassThru;
+};
+
+#endif