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C/C++ Source or Header  |  2001-10-08  |  2.5 KB  |  84 lines
  1. //------------------------------------------------------------------------------
  2. // File: SeekPT.cpp
  3. //
  4. // Desc: DirectShow base classes.
  5. //
  6. // Copyright (c) 1992-2001 Microsoft Corporation.  All rights reserved.
  7. //------------------------------------------------------------------------------
  8.  
  9.  
  10. #include <streams.h>
  11. #include "seekpt.h"
  12.  
  13. //==================================================================
  14. // CreateInstance
  15. // This goes in the factory template table to create new instances
  16. // If there is already a mapper instance - return that, else make one
  17. // and save it in a static variable so that forever after we can return that.
  18. //==================================================================
  19.  
  20. CUnknown * CSeekingPassThru::CreateInstance(LPUNKNOWN pUnk, HRESULT *phr)
  21. {
  22.     return new CSeekingPassThru(NAME("Seeking PassThru"),pUnk, phr);
  23. }
  24.  
  25.  
  26. STDMETHODIMP CSeekingPassThru::NonDelegatingQueryInterface(REFIID riid, void ** ppv)
  27. {
  28.     if (riid == IID_ISeekingPassThru) {
  29.         return GetInterface((ISeekingPassThru *) this, ppv);
  30.     } else {
  31.         if (m_pPosPassThru &&
  32.            (riid == IID_IMediaSeeking ||
  33.             riid == IID_IMediaPosition)) {
  34.             return m_pPosPassThru->NonDelegatingQueryInterface(riid,ppv);
  35.         } else {
  36.             return CUnknown::NonDelegatingQueryInterface(riid, ppv);
  37.         }
  38.     }
  39. }
  40.  
  41.  
  42. CSeekingPassThru::CSeekingPassThru( TCHAR *pName, LPUNKNOWN pUnk, HRESULT *phr )
  43.                             : CUnknown(pName, pUnk, phr),
  44.                             m_pPosPassThru(NULL)
  45. {
  46. }
  47.  
  48.  
  49. CSeekingPassThru::~CSeekingPassThru()
  50. {
  51.     delete m_pPosPassThru;
  52. }
  53.  
  54. STDMETHODIMP CSeekingPassThru::Init(BOOL bRendererSeeking, IPin *pPin)
  55. {
  56.     HRESULT hr = NOERROR;
  57.     if (m_pPosPassThru) {
  58.         hr = E_FAIL;
  59.     } else {
  60.         m_pPosPassThru =
  61.             bRendererSeeking ?
  62.                 new CRendererPosPassThru(
  63.                     NAME("Render Seeking COM object"),
  64.                     (IUnknown *)this,
  65.                     &hr,
  66.                     pPin) :
  67.                 new CPosPassThru(
  68.                     NAME("Render Seeking COM object"),
  69.                     (IUnknown *)this,
  70.                     &hr,
  71.                     pPin);
  72.         if (!m_pPosPassThru) {
  73.             hr = E_OUTOFMEMORY;
  74.         } else {
  75.             if (FAILED(hr)) {
  76.                 delete m_pPosPassThru;
  77.                 m_pPosPassThru = NULL;
  78.             }
  79.         }
  80.     }
  81.     return hr;
  82. }
  83.  
  84.