//------------------------------------------------------------------------------
  // File: SeekPT.cpp
  //
  // Desc: DirectShow base classes.
  //
  // Copyright (c) Microsoft Corporation.  All rights reserved.
  //------------------------------------------------------------------------------
  
  include <streams.h>
  include <seekpt.h>
  
  //==================================================================
  // CreateInstance
  // This goes in the factory template table to create new instances
  // If there is already a mapper instance - return that, else make one
  // and save it in a static variable so that forever after we can return that.
  //==================================================================
  
  CUnknown * CSeekingPassThru::CreateInstance(LPUNKNOWN pUnk, HRESULT *phr)
  {
      return new CSeekingPassThru(NAME("Seeking PassThru"),pUnk, phr);
  }
  
  STDMETHODIMP CSeekingPassThru::NonDelegatingQueryInterface(REFIID riid, void ** ppv)
  {
      if (riid == IID_ISeekingPassThru) {
          return GetInterface((ISeekingPassThru *) this, ppv);
      } else {
          if (m_pPosPassThru &&
              (riid == IID_IMediaSeeking ||
               riid == IID_IMediaPosition)) {
              return m_pPosPassThru->NonDelegatingQueryInterface(riid,ppv);
          } else {
              return CUnknown::NonDelegatingQueryInterface(riid, ppv);
          }
      }
  }
  
  CSeekingPassThru::CSeekingPassThru( TCHAR *pName, LPUNKNOWN pUnk, HRESULT *phr )
                              : CUnknown(pName, pUnk, phr),
                              m_pPosPassThru(NULL)
  {
  }
  
  CSeekingPassThru::~CSeekingPassThru()
  {
      delete m_pPosPassThru;
  }
  
  STDMETHODIMP CSeekingPassThru::Init(BOOL bRendererSeeking, IPin *pPin)
  {
      HRESULT hr = NOERROR;
      if (m_pPosPassThru) {
          hr = E_FAIL;
      } else {
          m_pPosPassThru =
              bRendererSeeking ?
                  new CRendererPosPassThru(
                      NAME("Render Seeking COM object"),
                      (IUnknown *)this,
                      &hr,
                      pPin) :
                  new CPosPassThru(
                      NAME("Render Seeking COM object"),
                      (IUnknown *)this,
                      &hr,
                      pPin);
          if (!m_pPosPassThru) {
              hr = E_OUTOFMEMORY;
          } else {
              if (FAILED(hr)) {
                  delete m_pPosPassThru;
                  m_pPosPassThru = NULL;
              }
          }
      }
      return hr;
  }