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C/C++ Source or Header  |  2001-10-08  |  2.0 KB  |  75 lines
  1. //------------------------------------------------------------------------------
  2. // File: SysClock.cpp
  3. //
  4. // Desc: DirectShow base classes - implements a system clock based on 
  5. //       IReferenceClock.
  6. //
  7. // Copyright (c) 1992-2001 Microsoft Corporation.  All rights reserved.
  8. //------------------------------------------------------------------------------
  9.  
  10.  
  11. #include <streams.h>
  12. #include <limits.h>
  13.  
  14.  
  15. #ifdef FILTER_DLL
  16.  
  17. /* List of class IDs and creator functions for the class factory. This
  18.    provides the link between the OLE entry point in the DLL and an object
  19.    being created. The class factory will call the static CreateInstance
  20.    function when it is asked to create a CLSID_SystemClock object */
  21.  
  22. CFactoryTemplate g_Templates[1] = {
  23.     {&CLSID_SystemClock, CSystemClock::CreateInstance}
  24. };
  25.  
  26. int g_cTemplates = sizeof(g_Templates) / sizeof(g_Templates[0]);
  27. #endif
  28.  
  29. /* This goes in the factory template table to create new instances */
  30. CUnknown * WINAPI CSystemClock::CreateInstance(LPUNKNOWN pUnk,HRESULT *phr)
  31. {
  32.     return new CSystemClock(NAME("System reference clock"),pUnk, phr);
  33. }
  34.  
  35.  
  36. CSystemClock::CSystemClock(TCHAR *pName,LPUNKNOWN pUnk,HRESULT *phr) :
  37.     CBaseReferenceClock(pName, pUnk, phr)
  38. {
  39. }
  40.  
  41. STDMETHODIMP CSystemClock::NonDelegatingQueryInterface(
  42.     REFIID riid,
  43.     void ** ppv)
  44. {
  45.     if (riid == IID_IPersist)
  46.     {
  47.         return GetInterface(static_cast<IPersist *>(this), ppv);
  48.     }
  49.     else if (riid == IID_IAMClockAdjust)
  50.     {
  51.         return GetInterface(static_cast<IAMClockAdjust *>(this), ppv);
  52.     }
  53.     else
  54.     {
  55.         return CBaseReferenceClock::NonDelegatingQueryInterface(riid, ppv);
  56.     }
  57. }
  58.  
  59. /* Return the clock's clsid */
  60. STDMETHODIMP
  61. CSystemClock::GetClassID(CLSID *pClsID)
  62. {
  63.     CheckPointer(pClsID,E_POINTER);
  64.     ValidateReadWritePtr(pClsID,sizeof(CLSID));
  65.     *pClsID = CLSID_SystemClock;
  66.     return NOERROR;
  67. }
  68.  
  69.  
  70. STDMETHODIMP 
  71. CSystemClock::SetClockDelta(REFERENCE_TIME rtDelta)
  72. {
  73.     return SetTimeDelta(rtDelta);
  74. }
  75.