SEEKPT.CPP

//==========================================================================; 
// 
//  THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY 
//  KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE 
//  IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR 
//  PURPOSE. 
// 
//  Copyright (c) 1992 - 1997  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("Silly Seeking Thing"),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; 
}