1 files changed, 74 insertions, 0 deletions
diff --git a/third_party/BaseClasses/sysclock.cpp b/third_party/BaseClasses/sysclock.cpp
new file mode 100644
index 00000000..0d582917
--- /dev/null
+++ b/third_party/BaseClasses/sysclock.cpp
@@ -0,0 +1,74 @@
+//------------------------------------------------------------------------------
+// File: SysClock.cpp
+//
+// Desc: DirectShow base classes - implements a system clock based on 
+//       IReferenceClock.
+//
+// Copyright (c) 1992-2001 Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------------------------
+
+
+#include <streams.h>
+#include <limits.h>
+
+
+#ifdef FILTER_DLL
+
+/* List of class IDs and creator functions for the class factory. This
+   provides the link between the OLE entry point in the DLL and an object
+   being created. The class factory will call the static CreateInstance
+   function when it is asked to create a CLSID_SystemClock object */
+
+CFactoryTemplate g_Templates[1] = {
+    {&CLSID_SystemClock, CSystemClock::CreateInstance}
+};
+
+int g_cTemplates = sizeof(g_Templates) / sizeof(g_Templates[0]);
+#endif
+
+/* This goes in the factory template table to create new instances */
+CUnknown * WINAPI CSystemClock::CreateInstance(__inout_opt LPUNKNOWN pUnk, __inout HRESULT *phr)
+{
+    return new CSystemClock(NAME("System reference clock"),pUnk, phr);
+}
+
+
+CSystemClock::CSystemClock(__in_opt LPCTSTR pName, __inout_opt LPUNKNOWN pUnk, __inout HRESULT *phr) :
+    CBaseReferenceClock(pName, pUnk, phr)
+{
+}
+
+STDMETHODIMP CSystemClock::NonDelegatingQueryInterface(
+    REFIID riid,
+    __deref_out void ** ppv)
+{
+    if (riid == IID_IPersist)
+    {
+        return GetInterface(static_cast<IPersist *>(this), ppv);
+    }
+    else if (riid == IID_IAMClockAdjust)
+    {
+        return GetInterface(static_cast<IAMClockAdjust *>(this), ppv);
+    }
+    else
+    {
+        return CBaseReferenceClock::NonDelegatingQueryInterface(riid, ppv);
+    }
+}
+
+/* Return the clock's clsid */
+STDMETHODIMP
+CSystemClock::GetClassID(__out CLSID *pClsID)
+{
+    CheckPointer(pClsID,E_POINTER);
+    ValidateReadWritePtr(pClsID,sizeof(CLSID));
+    *pClsID = CLSID_SystemClock;
+    return NOERROR;
+}
+
+
+STDMETHODIMP 
+CSystemClock::SetClockDelta(REFERENCE_TIME rtDelta)
+{
+    return SetTimeDelta(rtDelta);
+}