src/filters/BaseClasses/seekpt.cpp

   1 //------------------------------------------------------------------------------
   2 // File: SeekPT.cpp
   3 //
   4 // Desc: DirectShow base classes.
   5 //
   6 // Copyright (c) 1992-2002 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