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例子代码:

1、添加CMyOutputStream类.

class CMyOutputStream 	: public CBaseOutputPin, 	public IAMStreamConfig, 	public IKsPropertySet{public:	DECLARE_IUNKNOWN	STDMETHODIMP NonDelegatingQueryInterface(REFIID riid, void **ppv);public:	//  IQualityControl implementations	STDMETHODIMP Notify(IBaseFilter * pSender, Quality q);	//  IAMStreamConfig implementations	HRESULT STDMETHODCALLTYPE SetFormat(AM_MEDIA_TYPE *pmt);	HRESULT STDMETHODCALLTYPE GetFormat(AM_MEDIA_TYPE **ppmt);	HRESULT STDMETHODCALLTYPE GetNumberOfCapabilities(int *piCount, int *piSize);	HRESULT STDMETHODCALLTYPE GetStreamCaps(int iIndex, AM_MEDIA_TYPE **pmt, BYTE *pSCC);	//  IKsPropertySet implementations	HRESULT STDMETHODCALLTYPE Set(REFGUID guidPropSet, DWORD dwID, void *pInstanceData, DWORD cbInstanceData, void *pPropData, DWORD cbPropData);	HRESULT STDMETHODCALLTYPE Get(REFGUID guidPropSet, DWORD dwPropID, void *pInstanceData,DWORD cbInstanceData, void *pPropData, DWORD cbPropData, DWORD *pcbReturned);	HRESULT STDMETHODCALLTYPE QuerySupported(REFGUID guidPropSet, DWORD dwPropID, DWORD *pTypeSupport);	//  CBaseOutputPin implementations	CMyOutputStream(CMyFilter *pParent, CCritSec* pLock, HRESULT *phr, LPCWSTR pPinName);	HRESULT DecideBufferSize(IMemAllocator *pIMemAlloc, ALLOCATOR_PROPERTIES *pProperties);	HRESULT CheckMediaType(const CMediaType *pMediaType);	HRESULT GetMediaType(int iPosition, CMediaType *pmt);	HRESULT Active();	HRESULT Inactive();	HRESULT DeliverEndOfStream();	HRESULT DeliverBeginFlush();	HRESULT DeliverEndFlush();	HRESULT Deliver(IMediaSample* pSample);private:	CMyFilter *m_pParent;	COutputQueue* m_pOutputQ;};

2、在CMyFilter成员中添加CMyOutputStream* m_pOutput;

    在CMyFilter::GetPin中return m_pOutput;