2个输入引脚的CTeeOutputPin :: NonDelegatingQueryInterface的修改

问题描述

在开始播放电影时，Graph Edit由于此功能而挂起.
怎么了?

Graph Edit hangs because of this function, when begining to play movies.
What is wrong?

STDMETHODIMP
CEncOutPin::NonDelegatingQueryInterface(REFIID riid, void **ppv)
{
    CheckPointer(ppv,E_POINTER);
    ASSERT(ppv);
    *ppv = NULL;
    HRESULT hr = S_OK;
    // See what interface the caller is interested in.
    if(riid == IID_IMediaPosition || riid == IID_IMediaSeeking)
    {
        if(m_pPosition_1)
        {
            if(m_bHoldsSeek == FALSE)
                return E_NOINTERFACE;
            return m_pPosition_1->QueryInterface(riid, ppv);
        }
		if(m_pPosition_2)
        {
            if(m_bHoldsSeek == FALSE)
                return E_NOINTERFACE;
            return m_pPosition_2->QueryInterface(riid, ppv);
        }
    }
    else
    {
        return CBaseOutputPin::NonDelegatingQueryInterface(riid, ppv);
    }
    CAutoLock lock_it(m_pLock);
    ASSERT(m_pPosition_1 == NULL);
	ASSERT(m_pPosition_2 == NULL);
    IUnknown *pMediaPosition = NULL;
    // Try to create a seeking implementation
//    if(InterlockedExchange(&m_pParent->m_lCanSeek, FALSE) == FALSE)
	BOOL local_bool = m_pParent->m_lCanSeek;
	m_pParent->m_lCanSeek = FALSE;
	if(local_bool==FALSE)
        return E_NOINTERFACE;
    // Create implementation of this dynamically as sometimes we may never
    // try and seek. The helper object implements IMediaPosition and also
    // the IMediaSelection control interface and simply takes the calls
    // normally from the downstream filter and passes them upstream
	for(size_t local_counter=0;local_counter<m_pParent->m_pFirstInPins.size();local_counter++)
	{
	    hr = CreatePosPassThru(GetOwner(),
                           FALSE,
                           (IPin *)&m_pParent->m_pFirstInPins[local_counter],
                           &pMediaPosition);
//		hr = m_pParent->m_pFirstInPins[local_counter]->QueryInterface(IID_ISeekingPassThru,(void **)&pMediaPosition);
		if(pMediaPosition == NULL)
		{
//			InterlockedExchange(&m_pParent->m_lCanSeek, TRUE);
			m_pParent->m_lCanSeek = TRUE;
			return E_OUTOFMEMORY;
		}
		if(FAILED(hr))
		{
//			InterlockedExchange(&m_pParent->m_lCanSeek, TRUE);
			m_pParent->m_lCanSeek = TRUE;
	        pMediaPosition->Release();
		    return hr;
		}
		hr = ((ISeekingPassThru*)(pMediaPosition))->Init(FALSE,m_pParent->m_pFirstInPins[local_counter]);
		if(FAILED(hr))
		{
//			InterlockedExchange(&m_pParent->m_lCanSeek, TRUE);
			m_pParent->m_lCanSeek = TRUE;
	        pMediaPosition->Release();
		    return hr;
		}
		if(local_counter==0)
		{
			m_pPosition_1 = pMediaPosition;
		}
		if(local_counter==1)
		{
			m_pPosition_2 = pMediaPosition;
		}
	}
	
	m_bHoldsSeek = TRUE;
    return NonDelegatingQueryInterface(riid, ppv);
} // NonDelegatingQueryInterface

推荐答案

STDMETHODIMP
CEncOutPin::NonDelegatingQueryInterface(REFIID riid, void **ppv)
{
    CheckPointer(ppv,E_POINTER);
    ASSERT(ppv);
    *ppv = NULL;
    HRESULT hr = S_OK;
    // See what interface the caller is interested in.
    if(riid == IID_IMediaPosition || riid == IID_IMediaSeeking)
    {
    }
    else
    {
        return CBaseOutputPin::NonDelegatingQueryInterface(riid, ppv);
    }
    CAutoLock lock_it(m_pLock);
    ASSERT(m_pPosition_1 == NULL);
	ASSERT(m_pPosition_2 == NULL);
    IUnknown *pMediaPosition = NULL;
    // Try to create a seeking implementation
//    if(InterlockedExchange(&m_pParent->m_lCanSeek, FALSE) == FALSE)
	BOOL local_bool = m_pParent->m_lCanSeek;
	m_pParent->m_lCanSeek = FALSE;
	if(local_bool==FALSE)
        return E_NOINTERFACE;
    // Create implementation of this dynamically as sometimes we may never
    // try and seek. The helper object implements IMediaPosition and also
    // the IMediaSelection control interface and simply takes the calls
    // normally from the downstream filter and passes them upstream
	for(size_t local_counter=0;local_counter<m_pParent->m_pFirstInPins.size();local_counter++)
	{
		hr = CreatePosPassThru(GetOwner(),
                           FALSE,
                           (IPin *)&m_pParent->m_pFirstInPins[local_counter],
                           &pMediaPosition);
		if(pMediaPosition == NULL)
		{
//			InterlockedExchange(&m_pParent->m_lCanSeek, TRUE);
			m_pParent->m_lCanSeek = TRUE;
			return E_OUTOFMEMORY;
		}
		if(FAILED(hr))
		{
//			InterlockedExchange(&m_pParent->m_lCanSeek, TRUE);
			m_pParent->m_lCanSeek = TRUE;
	        pMediaPosition->Release();
		    return hr;
		}
		
		m_bHoldsSeek = TRUE;
		if(local_counter==0)
		{
			m_pPosition_1 = pMediaPosition;
			if(m_pPosition_1)
			{
				if(m_bHoldsSeek == FALSE)
					return E_NOINTERFACE;
				return ((CSeekingPassThru*)m_pPosition_1)->NonDelegatingQueryInterface(riid, ppv);
			}
		}
		if(local_counter==1)
		{
			m_pPosition_2 = pMediaPosition;
			if(m_pPosition_2)
		    {
	            if(m_bHoldsSeek == FALSE)
				    return E_NOINTERFACE;
		        return ((CSeekingPassThru*)m_pPosition_2)->NonDelegatingQueryInterface2(riid, ppv);
	        }
		}
	}
	
	return NonDelegatingQueryInterface(riid, ppv);
    
} // NonDelegatingQueryInterface

STDMETHODIMP CEncStreamsStereoTransformationFilter::NonDelegatingQueryInterface(REFIID riid, void **ppv)
{
#ifdef INFORMATION_MESSAGE
    ::MessageBoxW(0,L"STDMETHODIMP CEncStreamsStereoTransformationFilter::NonDelegatingQueryInterface(REFIID riid, void **ppv)",L"Information",MB_ICONINFORMATION);
#endif
/*/
    if (riid == IID_IMediaSeeking)
    {
        *ppv = (IMediaSeeking*)this;
        ((IUnknown*)*ppv)->AddRef();
        return S_OK;
    }
/*/
    return CBaseFilter::NonDelegatingQueryInterface(riid, ppv);
}

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